Abstract: Methods for forming a unitized crucible assembly for holding a melt of silicon for forming a silicon ingot are disclosed. In some embodiments, the methods involve a porous crucible mold having a channel network with a bottom channel, an outer sidewall channel that extends from the bottom channel, and a central weir channel that extends from the bottom channel. A slip slurry may be added to the channel network and the liquid carrier of the slip slurry may be drawn into the mold. The resulting green body may be sintered to form the crucible assembly.

Abstract: An inorganic felt material includes zirconia stabilized by at least one Group IIA material, such that the Group IIA material includes at least one of calcium (Ca), magnesium (Mg), or a combination thereof. The felt material may also include at least one Group III material.

Abstract: A manufacturing line includes a tape of green material that is directed through a furnace so that the furnace burns off organic binder material and then partially sinters the tape without the use of a setter board. Sintered articles resulting from the manufacturing line may be thin with relatively large surface areas; and, while substantially unpolished, have few sintering-induced surface defects. Tension may be applied to the partially sintered tape as it passes through a second furnace on the manufacturing line to shape resulting sintered articles.

Abstract: A dental all-ceramic restoration and manufacturing method thereof; the outer surface of the dental all-ceramic restoration has neither visible marks remaining from the removal of the connecting bars (7) nor local grinding traces and chipping, and is smooth with uniform structure. The manufacturing method thereof is wet-forming or milling. No connecting bars are needed to connect the dental restoration bodies (3) with a surrounding mould blank or ceramic blank. This eliminates the need for manually cutting off the connecting bars (7) to separate the forming body from the surrounding ceramic blank, further grinding and polishing process to treat the excessively rough outer surface, and thereby reducing the risk of chipping and premature failure. In the manufacturing processes thereof, the hardened ceramic green body (2) made by wet-forming technique has more homogenous microstructure and less particle packing defects than the dry-pressed blanks and partially sintered blanks.

Abstract: A fused-cast refractory product including, as mass percentages on the basis of the oxides and for a total of 100% of the oxides: ZrO2+HfO2: remainder to 100%, with HfO2?5%; SiO2: 1.5% to 7.5%; Al2O3: 1.0% to 3.0%; CaO+SrO: 1.2% to 3.0%; Y2O3: 1.5% to 3.0%; Na2O+K2O: <0.15%; B2O3: <1.0%; P2O5: <0.15%; Fe2O3+TiO2: <0.55%; oxide species other than ZrO2, HfO2, SiO2, Al2O3, Na2O, K2O, B2O3, CaO, SrO, Y2O3, P2O5, Fe2O3 and TiO2: <1.5%.

Abstract: The invention relates to a refractory ceramic batch for the production of an unformed refractory ceramic batch, the use of a batch of this kind for lining metallurgical melting vessels and also a metallurgical melting vessel which is lined with an unformed refractory ceramic product based on a batch of this kind.

Abstract: Disclosed are compositions, devices and methods related to thermal barrier coating materials having enhanced toughness. In some embodiments, a multiphase ceramic can include a first phase formed from a cubic and/or a tetragonally stabilized metal oxide, and a second phase formed from a magnetoplumbite-based aluminate that is chemically compatible with the first phase. Various example applications in which such materials can be utilized are disclosed.

Abstract: A high zirconia electrically fused cast refractory having long time durability with less cracking during production and in the course of temperature rising, excellent in productivity, less forming zircon crystals in the refractory itself and even in contact with molten glass, excellent in bubble foamability to molten glass, less generating cracks even undergoing heat cycles during operation of a glass melting furnace. A high zirconia electrically fused cast refractory comprises, as chemical component, 85 to 95% by weight of ZrO2, 0.4 to 2.5% by weight of Al2O3, 3.5 to 10.0% by weight of SiO2, 0.05% by weight or more of Na2O, 0.05 to 0.7% by weight of Na2O and K2O in total, 0.01 to 0.04% by weight of B2O3, 0.1 to 3.0% by weight of SrO or BaO when one of BaO and SrO is contained, 0.1% by weight or more of SrO and 0.1 to 3.0% by weight of SrO and BaO in total when both of BaO and SrO are contained, 0.01 to 0.2% by weight of CaO, 0.1% by weight or less of MgO, 0.01 to 0.7% by weight of SnO2, 0.

Abstract: A particulate composition for use in alumina-magnesia spinel forming dry vibratable mixtures may include, based on the total weight of the particulate composition, from 95 to 99.9 wt % of a mixture of particulate Al2O3 and particulate MgO, and from 0.1 to 5 wt % binding agent, wherein at least a portion of the particles of said mixture of particulate Al2O3 and particulate MgO is present in the particulate composition as a coating of particles on the surface of other particles. Methods of producing and using the particulate composition are also described.

Abstract: Disclosed is a particulate mixture having the following chemical composition, in percentages by weight on the basis of the oxides: ZrO2: ?10.0%; 2%<Al2O3?80%; 2 to 20.0% of an oxide chosen from Y2O3, Sc2O3, MgO, CaO, CeO2, and mixtures thereof, the MgO+CaO content being less than 5.0%; 0 to 18.0% of an oxide chosen from ZnO, lanthanide oxides except for CeO2, and mixtures thereof; less than 12.0% of other oxides. The particulate mixture also has a pigment made of a material chosen from oxide(s) of perovskite structure, oxides of spinel structure, oxides of hematite structure E2O3, the element E being selected from the group GE(1) consisting of the mixtures of aluminum and chromium, the mixtures of aluminum and manganese, and mixtures thereof, the oxides of rutile structure FO2.

Abstract: Fused cast refractory product comprising in percentages by weight on the basis of the oxides and for a total of 100%, —ZrO2; balance to 100%, —HfO2: <5% SiO2: 2% to 10%; —Y2O3: 0.4% to 2.0%; —CaO: 4.0% to 8.0%; —B2O3+Na2O+K2O: 0.4% to 3.0% —Al2O3: 0.3% to 2.0%; —P2O5: <0.05%; —Fe2O3+TiO2: <0.55%; —other species: <1.5%. Application in glass melting furnaces.

Abstract: Described is an assembly for an internal combustion rotary engine of a single or multi-rotor type. The assembly includes parts without cooling channels that comprise a monolithic ceramic material or ceramic matrix composite material capable of allowing the engine when assembled to operate at elevated temperatures that would cause metal parts of a metal engine to lose strength, lose structural and mechanical integrity, suffer excessive oxidation/corrosion and/or fail. The ceramic material also allows the engine when assembled to operate with significantly lower heat loss to the surrounding environment as compared with a similar engine made using all metal parts. The ceramic material allows the engine when assembled to operate without requiring substantial cooling elements or an external fluid (e.g. water) cooling system. The engine when assembled as described will retain more heat or operate with a substantially reduced rate of heat rejection when compared to an entirely metal rotary engine.

Abstract: An article with a sintered decorative part obtained from a particulate mixture having the following chemical composition: zirconia ZrO2: complement to 100%; 0.5% to 10.0% of oxide(s) with a perovskite structure; 2.0% to 20.0% of a stabilizer for zirconia selected from Y2O3, Sc2O3, MgO, CaO, CeO2, and mixtures thereof, the quantity MgO+CaO being less than 5.0%; less than 2.0% of a sintering additive selected from Al2O3, ZnO, TiO2, and mixtures thereof; and less than 2.0% of other oxides.

Abstract: To provide a high zirconia fused cast refractory which has high corrosion resistance to molten glass and which is scarcely susceptible to cracking during its production. A high zirconia fused cast refractory which has a chemical composition comprising from 96.5 to 98.5 mass % of ZrO2, from 0.8 to 2.7 mass % of SiO2, from 0.04 to 0.35 mass % in a total amount of Na2O and K2O, and from 0.02 to 0.18 mass % of B2O3, wherein contents of Na2O, K2O and B2O3 satisfy the relation of the following formula (1) at the same time: 0.03?CB2O3?(CNa2O+CK2O)??(1) wherein CNa2O is the content of Na2O, CK2O is the content of K2O, and CB2O3 is the content of B2O3, and each of these contents represents mass % in the refractory.

Abstract: Fused grain having the following chemical composition: more than 10% and less than 50% of alumina Al2O3; more than 10% and less than 50% of titanium oxide TiO2; more than 21% and less than 50% of zirconia; more than 1% and less than 10% of a compound chosen from the group constituted by MgO, CaO, Fe2O3, Cr2O3, MnO2, La2O3, Y2O3, Ga2O3 and mixtures thereof; less than 20% of silica SiO2; less than 10% of a compound chosen from the group constituted by alkali metal oxides, alkaline-earth metal oxides and mixtures thereof; less than 2% of other oxide species; the percentages being percentages by weight on the basis of the oxides. Application in the melting of metals.

Abstract: Shape memory and pseudoelastic martensitic behavior is enabled by a structure in which there is provided a crystalline ceramic material that is capable of undergoing a reversible martensitic transformation and forming martensitic domains, during such martensitic transformation, that have an elongated domain length. The ceramic material is configured as a ceramic material structure including a structural feature that is smaller than the elongated domain length of the ceramic material.

Abstract: There is disclosed a porous material. The porous material contains aggregates, and a bonding material which bonds the aggregates to one another in a state where pores are formed among the aggregates, the bonding material contains crystalline cordierite, the bonding material further contains a rare earth element or a zirconium element, and a ratio of a mass of the bonding material to a total mass of the aggregates and the bonding material is from 12 to 45 mass %. The bonding material preferably contains, in the whole bonding material, 8.0 to 15.0 mass % of MgO, 30.0 to 60.0 mass % of Al2O3, 30.0 to 55.0 mass % of SiO2, and 1.5 to 10.0 mass % of a rare earth oxide or zirconium oxide.

Abstract: A sintering composition and calcined object which are precursors for a sintered zirconia. The burned surface of the sintered zirconia gives an X-ray diffraction pattern in which the ratio of the height of the peak present around the location where a [200] peak assigned to the cubic system is to appear to the height of the peak present around the location where a [200] peak assigned to the tetragonal system is to appear is 0.4 or more, and a region located at a depth of 100 ?m or more from the burned surface gives an X-ray diffraction pattern in which the ratio of the height of the peak present around the location where a [200] peak assigned to the cubic system is to appear to the height of the peak present around the location where a [200] peak assigned to the tetragonal system is to appear is 0.3 or less.

Abstract: The invention describes a dental article comprising zirconium oxide and at least two different coloring substances A and B, substance A showing a light emission in the range of about 470 nm to about 510 nm and substance B showing a light absorption in the range from about 520 nm to about 750 nm. The invention also relates to different processes of producing the dental article e.g. by a process comprising a casting step, a pressing step, or an infiltration step and to the use of certain compositions containing either substance A or substance B for producing such a dental article.

Abstract: A sintering support comprising a fully stabilized zirconia outer surface; wherein the sintering support withstands sintering a ceramic part in contact with the outer surface without adhesion between the outer surface and the ceramic part, and methods of making and using the sintering support are disclosed.

Abstract: The subject of the present invention relates to obtaining a zirconia sintered body having excellent in both properties of a translucency and a mechanical strength. The present invention relates to obtaining a high-strength zirconia sintered body having a translucency of an in-line transmission of 50% or more at a sample thickness of 1 mm for visible light at a wavelength of 600 nm and an average flexural strength of 300 MPa or more by subjecting a zirconia primary sintered body having an average grain size of 1 ?m or less and a relative density of 92% or more and the crystal phase composed of cubic crystals only to HIP treatment at a temperature of 1,250° C. to 1,600° C. and a pressure of at least 50 MPa. The primary sintered body is obtained by maintaining a molded body of a zirconia powder containing 7 mol % to 30 mol % of yttria at 1,100° C. to 1,300° C. for at least 5 hrs or by heating the molded body at a high rate of temperature rise of 500° C./hr or more.

Abstract: A method of producing a carrier used for a catalyst for oxidative dehydrogenation of n-butane; a method of producing a magnesium orthovanadate catalyst supported by the carrier; and a method of producing n-butene and 1,3-butadiene using the catalyst are described.

Abstract: Refractory cold start slag band including an admixture of partially stabilised zirconia and/or fully stabilised zirconia and monoclinic zirconia. The proportion of monoclinic relative to the total zirconia content is at least 50% by weight and the grain diameter of the monoclinic zirconia is from 0.25 to 0.5mm.

Abstract: To provide a high zirconia fused cast refractory which has high corrosion resistance to molten glass and which is scarcely susceptible to cracking during its production. A high zirconia fused cast refractory which has a chemical composition comprising from 96.5 to 98.5 mass % of ZrO2, from 0.8 to 2.7 mass % of SiO2, from 0.04 to 0.35 mass % in a total amount of Na2O and K2O, and from 0.02 to 0.18 mass % of B2O3, wherein contents of Na2O, K2O and B2O3 satisfy the relation of the following formula (1) at the same time: 0.03?CB2O3?(CNa2O+CK2O)??(1) wherein CNa2O is the content of Na2O, CK2O is the content of K2O, and CB2o3 is the content of B2O3, and each of these contents represents mass % in the refractory.

Abstract: Shot blasting particles are constituted by a ceramic material having an apparent relative density of more than 4.0 and less than 5.0 and comprising more than 5% of silica, as a percentage by weight based on the oxides.

Abstract: This invention relates to thermally sprayed coatings of a high purity yttria or ytterbia stabilized zirconia powder, said high purity yttria or ytterbia stabilized zirconia powder comprising from about 0 to about 0.15 weight percent impurity oxides, from about 0 to about 2 weight percent hafnium oxide (hafnia), from about 6 to about 25 weight percent yttrium oxide (yttria) or from about 10 to about 36 weight percent ytterbium oxide (ytterbia), and the balance zirconium oxide (zirconia). Thermal barrier coatings for protecting a component such as blades, vanes and seal surfaces of gas turbine engines, made from the high purity yttria or ytterbia stabilized zirconia powders, have a density greater than 88% of the theoretical density with a plurality of vertical macrocracks homogeneously dispersed throughout the coating to improve its thermal fatigue resistance.

Abstract: Dental articles are produced using relatively low sintering temperatures to achieve high density dental articles exhibiting strengths equal to and greater than about 700 MPa. Ceramic powders comprised of nanoparticulate crystallites are used to manufacture dental articles. The ceramic powders may include sintering agents, binders and other similar additives to aid in the processing of the ceramic powder into a dental article. The ceramic powders may be processed into dental articles using various methods including, but not limited to, injection molding, gel-casting, slip casting, or electroforming, hand, cad/camming and other various rapid prototyping methods. The ceramic powder may be formed into a suspension, pellet, feedstock material or a pre-sintered blank prior to forming into the dental article.

Abstract: Low-carbon monolithic refractories are provided. Methods of manufacturing glass employing low-carbon monolithic refractories are also provided. Methods and apparatuses for glass manufacture for reducing the formation of carbon dioxide blisters during glass manufacture are also provided.

Abstract: In one aspect, the invention includes a refractory material, said material comprising: (i) at least 20 wt. % of a first grain mode stabilized zirconia based upon the total weight of said material, said first grain mode having a D50 grain size in the range of from 5 to 2000 ?m, said stabilized zirconia including a matrix oxide stabilizer; (ii) at least 1 wt. % of a second grain mode having a D50 grain size in the range of from 0.01 ?m up to not greater than one-fourth the D50 grain size of said first grain mode zirconia, based upon the total weight of said material; and (iii) at least 1 wt. % of a preservative component within at least one of said first grain mode stabilized zirconia, said second grain mode stabilized zirconia, and an optional another grain mode; wherein after sintering, said material has porosity at 20° C. in the range of from 5 to 45 vol %.

Abstract: A new investment material for the pressing loss wax technique for dental glass ceramics. It has been found that the addition of fillers to a magnesium phosphate investment, specifically metal oxides with elevated melting points ranging from 1800 to 2800° C., provides a protection barrier against the reaction between the high alkaline content of the glass ceramic and the investment during the pressing process in the range of 800 to 950° C. Specifically, it has been found that the addition of aluminum oxide of about 2 to 5 percent of the total dry mix in combination with any of the zirconium oxide, yttrium stabilized zirconium, titanium dioxide and boron nitride in proportions of about 3.5%, enhances the barrier against a surface reaction and improves the thermal properties of the investment.

Abstract: The present application is directed to a zirconia toughened alumina body and process for making the body. The process involves combining tetragonally stabilized ZrO2 nanoparticles, Mg(OH)2 particles and alumina powder into a mixture. All particles of the mixture are milled, formed into a green compact and then sintered. The final composition of the body includes ?-Al2O3 toughened with 0.5 to 2.5 weight percent ZrO2 in a stabilized tetragonal form and 0.03 to 0.10 weight percent MgO. The composition results in an Al2O3 body with a density less than 4.0 g/cc and strength greater than 50 kpsi.

Abstract: Provided is a method of producing a composite metal oxide including, to calcine a composition containing an alkali metal and obtain a composite metal oxide, calcining the composition while being arranged on a mount a part of which in contact with the composition is formed of a metal oxide component. The metal oxide component has a content of K atoms ranging from 5 to 13 parts by weight in terms of K2O with respect to 100 parts by weight of the metal oxide component, and a total content of Al atoms, Zr atoms, Mg atoms, and Ce atoms ranging from 15 to 70 parts by weight in terms of oxides with respect to 100 parts by weight of the metal oxide component. The present invention thus provides a method of producing a composite metal oxide containing an alkali metal with reduced production costs.

Abstract: Sintered refractory product including, in percentages by weight on the basis of the oxides, —more than 10% of chromium oxide Cr2O3, —more than 2% of hafnium oxide HfO2, —more than 1% of zirconium oxide ZrO2, the total content of chromium, hafnium and zirconium oxides Cr2O3+HfO2+ZrO2 being greater than 70%.

Abstract: A sintered product having an average chemical composition such that, in weight percentages on the basis of the oxides: Cr2O3=80.0-99.0%; 0.5%?TiO2?9.0%; 0.2%?MgO?3.0%; and ZrO2?5.0%, provided that the ratio of TiO2/MgO is between 1.5 and 9.0 and the molar ratio TiO2/Cr2O3 is less than 0.12.

Abstract: Fused grain having the following chemical composition: more than 10% and less than 50% of alumina Al2O3; more than 10% and less than 50% of titanium oxide TiO2; more than 21% and less than 50% of zirconia; more than 1% and less than 10% of a compound chosen from the group constituted by MgO, CaO, Fe2O3, Cr2O3, MnO2, La2O3, Y2O3, Ga2O3 and mixtures thereof; less than 20% of silica SiO2; less than 10% of a compound chosen from the group constituted by alkali metal oxides, alkaline-earth metal oxides and mixtures thereof; less than 2% of other oxide species; the percentages being percentages by weight on the basis of the oxides. Application in the melting of metals.

Abstract: To provide a high zirconia fused cast refractory which hardly has cracks, and has excellent durability and reusability, at the time of production of the refractory and during use for a glass melting furnace. A high zirconia fused cast refractory which has a chemical composition comprising from 85 to 95 mass % of ZrO2, at least 2.5 mass % of SiO2, at most 0.04 mass % of Na2O, at most 0.04 mass % of B2O3, and at most 0.04 mass % of P2O5, containing SrO as an essential component, and containing at least one of K2O and Cs2O, wherein contents of SrO, K2O and Cs2O satisfy the relations of the following formula (1) and (2) at the same time: 0.20?[0.638×CK2O+0.213×CCs2O+0.580×CSrO]/CSiO2?0.40??(1) 0.10?0.

Abstract: A material mixture for producing a fireproof material, including spinel and zirconium oxide and a coarse-grained fraction with a weight fraction of greater than 50% and a fine-grained fraction, wherein the coarse-grained fraction includes coarse grains with dimensions larger than 20 ?m and the fine-grained fraction includes fine grains with dimensions smaller than 20 ?m.

Abstract: In one aspect, the invention includes a refractory material, said material comprising: (i) at least 20 wt. % of a first grain mode stabilized zirconia based upon the total weight of said material, said first grain mode having a D50 grain size in the range of from 5 to 2000 ?m, said stabilized zirconia including a matrix oxide stabilizer; (ii) at least 1 wt. % of a second grain mode having a D50 grain size in the range of from 0.01 ?m up to not greater than one-fourth the D50 grain size of said first grain mode zirconia, based upon the total weight of said material; and (iii) at least 1 wt. % of a preservative component within at least one of said first grain mode stabilized zirconia, said second grain mode stabilized zirconia, and an optional another grain mode; wherein after sintering, said material has porosity at 20° C. in the range of from 5 to 45 vol %.

Abstract: To provide a high zirconia fused cast refractory having high durability, which hardly has cracks during the heating, by temperature changes during use and during the cooling at the time of suspension of operation. A high zirconia fused cast refractory which has a chemical composition comprising from 86 to 96 mass % of ZrO2, from 2.5 to 8.5 mass % of SiO2, from 0.4 to 3 mass % of Al2O3, from 0.4 to 1.8 mass % of K2O, at most 0.04 mass % of B2O3, at most 0.04 mass % of P2O5 and at most 3.8 mass % of Cs2O and containing substantially no Na2O.

Abstract: To provide a high zirconia fused cast refractory which hardly has cracks, and has excellent durability and reusability, at the time of production of the refractory and during use for a glass melting furnace. A high zirconia fused cast refractory which has a chemical composition comprising from 85 to 95 mass % of ZrO2, at least 2.5 mass % of SiO2, at most 0.04 mass % of Na2O, at most 0.04 mass % of B2O3, and at most 0.04 mass % of P2O5, containing SrO as an essential component, and containing at least one of K2O and Cs2O, wherein contents of SrO, K2O and Cs2O satisfy the relations of the following formula (1) and (2) at the same time: 0.20?[0.638×CK2O+0.213×CCs2O+0.580×CSrO]/CSiO2?0.40 ??(1) 0.10?0.

Abstract: The present invention relates to a molten, fluid refractory product comprising, in weight percentages on the basis of the oxides and for a total of 100% of the oxides: ZrO2+Hf2O: remainder to 100% 4.0%<SiO2<6.5% Al2O3?0.75% 0.2%<B2O3<1.5% 0.3%<Ta2O5 Nb2O5+Ta2O5<1.4% Na2O+K2O<0.2% BaO<0.2% P2O5<0.15% Fe2O3+TiO2<0.55% other oxide species: <1.5% the “A/B” ratio of Al2O3/B2O3 content by weight being no higher than 1.50. The invention can be used in glass melting furnaces.

Abstract: The invention relates to a particulate powder, said powder having a median circularity of greater than 0.87 wt % and less than 9.0 wt % of particles having a size greater than 100 ?m. The powder and at least 80 wt % of the particles have a chemical composition in wt % on the basis of the oxides and for a total of 100%: Cr2O3+Al2O3+ZrO2+MgO+Fe2O3+SiO2+TiO2?90%; Cr2O3+Al2O3+MgO?60%; Cr2O3?9%; 20%?SiO2?0.5%; and other oxides: ?10%. The invention can be used for a glass furnace.

Abstract: The invention relates to a molten cast refractory product comprising, in weight percentages on the basis of the oxides and relative to a total of 100% of the oxides: ZrO2+Hf2O is the remainder making up 100%, 4.5%<SiO2<6.0%, 0.80%?Al2O3<1.10%, 0.3%<B2O3<1.5%, Ta2O5+Nb2O5<0.15%, Na2O+K2O<0.1%, K2O<0.04%, CaO+SrO+MgO+ZnO+BaO<0.4%, P2O5<0.05%, Fe2O3+TiO2<0.55%, and other oxide species<1.5%, the “A/B” ratio of the Al2O3/B2O3 contents by weight being between 0.75 and 1.6. The invention can be applied to glass melting furnaces.

Abstract: The present invention relates to a molten, fluid refractory product comprising, in weight percentages on the basis of the oxides and for a total of 100% of the oxides: ZrO2+Hf2O: remainder to 100% 4.5%<SiO2<6.0% Al2O3<0.80% 0.3%<B2O3<1.0% Ta2O5+Nb2O5<0.15% Na2O+K2O<0.1% K2O<0.04% CaO+SrO+MgO+ZnO+BaO<0.4% P2O6<0.05% Fe2O3+TiO2<0.55% other oxide species, optionally including Y2O3: <1.5%, where Y2O3<0.3%, the “A/B” ratio of Al2O3/B2O3 content by weight being 0.5 to 2.0. The invention can be used in glass melting furnaces.

Abstract: A fused refractory product having the following average chemical composition, in % by weight on the basis of oxides and for a total of 100%: ZrO2: 30-50%; SiO2: 8-16%; Al2O3: balance to 100%; Y2O3?50/ZrO2 and Y2O3?5%; Na2O+K2O+B2O3?0.2% and SiO2/(Na2O+K2O+B2O3)?5×Y2O3; CaO: ?0.5%; and other oxide species: ?1.5%.

Abstract: In one aspect, the invention includes a refractory material, said material comprising: (i) at least 20 wt. % of a first grain mode stabilized zirconia based upon the total weight of said material, said first grain mode having a D50 grain size in the range of from 5 to 2000 ?m, said stabilized zirconia including a matrix oxide stabilizer; (ii) at least 1 wt. % of a second grain mode having a D50 grain size in the range of from 0.01 ?m up to not greater than one-fourth the D50 grain size of said first grain mode zirconia, based upon the total weight of said material; and (iii) at least 1 wt. % of a preservative component within at least one of said first grain mode stabilized zirconia, said second grain mode stabilized zirconia, and an optional another grain mode; wherein after sintering, said material has porosity at 20° C. in the range of from 5 to 45 vol %.

Abstract: This invention relates to thermally sprayed coatings of a high purity yttria or ytterbia stabilized zirconia powder, said high purity yttria or ytterbia stabilized zirconia powder comprising from about 0 to about 0.15 weight percent impurity oxides, from about 0 to about 2 weight percent hafnium oxide (hafnia), from about 6 to about 25 weight percent yttrium oxide (yttria) or from about 10 to about 36 weight percent ytterbium oxide (ytterbia), and the balance zirconium oxide (zirconia). Thermal barrier coatings for protecting a component such as blades, vanes and seal surfaces of gas turbine engines, made from the high purity yttria or ytterbia stabilized zirconia powders, have a density greater than 88% of the theoretical density with a plurality of vertical macrocracks homogeneously dispersed throughout the coating to improve its thermal fatigue resistance.

Abstract: The invention relates to a sintered product containing: in mass percent based on oxides, more than 99.5% of a material having a cubic crystallographic structure for more than 95% of the mass thereof, known as a material with a cubic structure, and having a refractive index of less than 2.75 in the wavelength range between 0.2 ?m and 5 ?m; and more than 50 ppma of dopants which must contain titanium oxide TiO2 and at least one additional dopant selected from ZrO2, CaO, and MgO, in which said at least one additional dopant is different from the oxide(s) forming the material with a cubic structure, but can be MgO when the material with a cubic structure is spinel MgAl2O4.

Abstract: The invention relates to a powder comprising more than 70% of refractory particles, in weight percent relative to the weight of the powder, a particle of said powder being classed in the fraction called “matrix” or in the fraction called “aggregate”, according to whether it is smaller than, or equal to 100 ?m, or larger than 100 ?m, respectively, said powder comprising, in weight percent relative to the weight of the powder: between 0.1% and 18% of particles of a heat-activatable binder, called “heat-activatable binder particles”; and more than 40% of refractory particles, called “ATZ particles”, having the following chemical composition, in weight percentages on the basis of the oxides of said ATZ particles: 10%?Al2O3?55%; 35%?TiO2?80%; 1%?MgO+Cr2O3?10%; 8%?ZrO2?20%; SiO2?8%.

Abstract: A fused and cast refractory product containing, in weight percentages on the basis of the oxides and for a total of 100%: ZrO2: remainder up to 100% Hf2O: <5% SiO2: 2% to 10% 0.9%<Y2O3+CeO2+CaO+MgO?4.0% B2O3: ?4.5% B2O3: ?0.09×(Y2O3+?(CeO2+CaO+MgO))×SiO2 Al2O3: 0.3% to 2.0% Na2O+K2O: ?0.5% P2O5: <0.05% Fe2O3 TiO2: <0.55% other species: <1.0%, as long as the Y2O3 content is no lower than 0.5% and the CeO2 +CaO+MgO content is no lower than 2%.