Abstract: The invention relates to a wear protection layer comprising a mixture of non-uniform transparent hard material particles, which are stored in a matrix material and which comprise a Mohs hardness of at least 6 and transparent solid material particles, wherein the transparent solid material particles encompass a bi-modal grain size distribution. The invention also relates to a method for producing a wear protection layer as well as the use thereof for producing wear protection surfaces, in particular surfaces on wood fiber boards, which are provided with a a décor.

Abstract: An abrasive grain made from melted spherical corundum where the abrasive grain consists of a spherical corundum core, coated with an encircling layer of a binder and fine-grained abrasive solid particles.

Abstract: Heat treated alumina zirconia abrasive grains based on Al2O3 and ZrO2 may be fused in an electric arc furnace, and may have a weight content of: Al2O3 between 52% and 62% by weight; ZrO2 and HfO2 between 35% and 45% by weight, with at least 6% by weight based on the total weight content of ZrO2 being present in the tetragonal and/or cubic high temperature modifications of ZrO2; Si-compounds between 0.2% and 0.7% by weight expressed as SiO2; carbon between 0.03% and 0.5% by weight; additives between 0.5% and 10% by weight; and raw-material-based impurities of less than 3% by weight. The heat treated alumina zirconia abrasive grains may be heat treated in air between 350° C. and 700° C. for a time period of one to six hours using a rotary kiln.

Abstract: The present invention relates to sintered shaped abrasive grains on basis of aluminum oxide. Sintered shaped abrasive grains consistent with the disclosure include mineralogical phases made of mullite, tialite and/or armalcolite, and baddeleyite and/or srilankite. Methods for producing sintered shaped abrasive grains using alumina, ilmenite and zircon sand as raw materials are also provided.

Abstract: The present invention relates to temperature-treated polycrystalline porous Al2O3 bodies comprising an amount of ? aluminum oxide of more than 97% by weight, an amount of other oxide alloying components of a total of less than 3% by weight, a macroporosity of between 5 and 30% by volume, wherein the Al2O3 bodies are composed of a plurality of Al2O3 primary crystals comprising a crystallite size of between 20 and 100 ?m.

Abstract: The present invention relates to an abrasive grain on the basis of electrofused aluminum oxide with a surface coating comprising titanium oxide and/or carbon, wherein compounds formed of titanium oxide and/or carbon particles at the abrasive grain surface by means of a temperature treatment are tightly connected to the abrasive grain surface without an additional binding agent.

Abstract: Titanium oxide-containing aluminum oxide particles are based on corundum melted in an electric arc furnace from calcined alumina. The particles may have an aluminum oxide content of less than 97.0% by weight, a titanium oxide content ranging from 1.3% by weight to 1.8% by weight, and a zirconium oxide content of ranging from 0.02% by weight to 0.1% by weight. The aluminum oxide particles may have an arithmetic mean compactness of less than 0.8.

Abstract: The present invention relates to abrasive grain agglomerates composed of fine-particle primary abrasive grains which are held together by means of a binder based on an aluminosilicate having a molar ratio of Al2O3 to SiO2 of from 1:2 to 1:20. The particular advantage of these abrasive grain agglomerates is that the binder cures fully at below 450° C., preferably below 400° C., to form abrasive grain agglomerates having an extraordinarily high strength.

Abstract: The present description relates to a refractory composition including 70 weight percent to 98 weight percent particulate refractory material and 2 weight percent to 30 weight percent of a binder phase including reactive filler and a binder, the binder phase substantially includes solely reactive andalusite as reactive filler.

Abstract: Disclosed herein are abrasive grains based on zirconia alumina melted in an electric arc furnace, comprising a content of 52 to 62 wt % Al203 and 35 to 45 wt % ZrO2, wherein the high-temperature phases of the zirconia are stabilized by a combination of reduced Ti compounds and yttrium oxide.

Abstract: The present invention relates to abrasive grains, which are coated with a micro-particle inorganic powder and a binder, consisting of the group of conventional abrasive grains as well as the group of the “superabrasives”, wherein the binder comprises an aluminosilicate with a molar ratio of Al2O3 to SiO2 of 1:2 to 1:20 as well as at least one complex alkaline fluoride. The particular advantage of this coating is that the binder can already be completely hardened at below 400° C. The invention also relates to a method for producing such abrasive grains as well as to the use thereof for producing abrasives.

Abstract: The present invention relates to polycrystalline Al2O3 bodies based on melted aluminum oxide having a mean crystallite size of the primary crystals between 20 ?m and 100 ?m and a closed macroporosity between 10% by volume and 30% by volume. The polycrystalline Al2O3 bodies may be obtained by tapping out and quenching a liquid aluminum oxide melt and simultaneous seeding of the pouring stream with seed crystals and can be used advantageously for the production of abrasive materials and refractory products.

Abstract: The present invention relates to sintered abrasive grit agglomerates based on aluminum oxide, having homogeneously distributed nanoscale pores in the range of 100-300 nm, with a pore volume of at least 15%. The average diameter of primary particles of the aluminum oxide primary particles is less than 5 ?m, wherein said primary particles are connected to each other without additional adhesive agent.

Abstract: Slurry which contains a) from (50) to (80)% by weight of refractory particles having an average particle size of from (0.5) m to (150) m, b) from (5) to (35)% by weight of aluminum oxide particles having an average particle diameter of less than (300) nm and c) from (5) to (35)% by weight of water and d) a pH of from (5) to (12). Process for producing the slurry using a dispersion, and also the dispersion itself. Process for producing a casting mold, and also the casting mold itself.

Abstract: The present description relates to a refractory composition including 70 weight percent to 98 weight percent particulate refractory material and 2 weight percent to 30 weight percent of a binder phase including reactive filler and a binder, the binder phase substantially includes solely reactive andalusite as reactive filler.

Abstract: An article has an anti-abrasion layer, comprising a mixture of irregular particles of hard material and round particles essentially free of cutting edges embedded in a matrix material and the use thereof for the production of anti-abrasion surfaces on wood materials, decorative paper, or wood fiber sheets printed with patterns for the production of parquet floors, floor laminates, furniture surfaces or work boards and for the production of wear-resistant surface layers on support materials made from metal, glass, ceramics, plastic concrete or other materials.

Abstract: An article has an anti-abrasion layer, comprising a mixture of irregular particles of hard material and round particles essentially free of cutting edges embedded in a matrix material and the use thereof for the production of anti-abrasion surfaces on wood materials, decorative paper, or wood fibre sheets printed with patterns for the production of parquet floors, floor laminates, furniture surfaces or work boards and for the production of wear-resistant surface layers on support materials made from metal, glass, ceramics, plastic concrete or other materials.

Abstract: The present invention relates to polycrystalline Al2O3 bodies based on melted aluminum oxide having a mean crystallite size of the primary crystals between 20 ?m and 100 ?m and a closed macroporosity between 10% by volume and 30% by volume. The polycrystalline Al2O3 bodies may be obtained by tapping out and quenching a liquid aluminum oxide melt and simultaneous seeding of the pouring stream with seed crystals and can be used advantageously for the production of abrasive materials and refractory products.

Abstract: The invention relates to an anti-abrasion layer, comprising a mixture of irregular particles of hard material and round particles essentially free of cutting edges embedded in a matrix material and the use thereof for the production of anti-abrasion surfaces on wood materials, decorative paper, or wood fiber sheets printed with patterns for the production of parquet floors, floor laminates, furniture surfaces or work boards and for the production of wear-resistant surface layers on support materials made from metal, glass, ceramics, plastic concrete or other materials.

Abstract: Disclosed herein are abrasive grains based on zirconia alumina melted in an electric arc furnace, comprising a content of 52 to 62 wt % Al203 and 35 to 45 wt % ZrO2, wherein the high-temperature phases of the zirconia are stabilized by a combination of reduced Ti compounds and yttrium oxide.