Abstract: Drums of moisture or air sensitive materials are protected by placing on the exposed surface of the material, a layer of a fluid second material that is essentially impervious to air and moisture and is neither soluble nor miscible in the material being protected.

Abstract: Fibers for use in forming fiber reinforced ceramic composites may be effectively deagglomerated and/or dispersed in the precursor from which the continuous phase of the composite is to be derived by passing the fibers through a screen with openings that are from two to ten times as wide as the fiber diameter. By using this technique, composites of alumina fibers in a partially stabilized zirconia matrix have been prepared with better fiber orientation and fiber aspect ratio than previously achieved.

Abstract: A double sided adhesive tape with a low surface energy adhesive on at least one side. The low surface energy adhesive has superior properties when the adherend is of the low surface energy type such as low surface energy acrylic paint, polyethylene, polytetrafluoroethylene and the like and the surface energy of the adhesive is lower than that of the adherend.

Abstract: A refractory product is shown in the form of a dense sintered alumina-chromia, zirconia-alumina-silica, zirconia-alumina body, or zirconia-chromia-alumina having less than about 8% of homogeneously distributed closed porosity formed by sintering an intimate interdispersion of fine particles of alumina-chromia, zirconia-alumina-silica, zirconia-alumina, or zirconia-chromia-alumina.

Abstract: A combination of materials is disclosed which imparts superior fire retardant properties to organic polymers and the gaseous by-products of those polymers. The combination is made up of an organo phosphate plasticizer, aluminum hydroxide or alumina hydrate, antimony trioxide, a borate, a brominated hydrocarbon and a chlorinated paraffin.

Abstract: Seeding of beta type alumina compositions in which the alumina in the raw batch is microcrystalline boehmite results in significant increase in hardness, density and strength, as compared to unseeded beta alumina, when fired under similar conditions.

Abstract: Microcrystalline boehmite suitable for conversion to anhydrous alumina products is produced by hydrothermal treatment of precursor alumina raw material at controlled pH and in the presence of microcrystalline boehmite seed material. Reaction mix may include submicron seed material for seedling for later conversion of the microcrystalline boehmite to alpha alumina. Removal of metal cations by ion exchange is employed when high purity product is required. Other materials may be added to reaction mix. Production of alumina products, catalysts, and ceramic bodies is disclosed.

Abstract: A cement for vessels for containing molten alloys of aluminum with metals selected from the group consisting of lithium, magnesium, zinc and copper is shown that forms a hard sintered crust for containing the molten alloy in the vessel with a backing of granular cement for controlling thermal stress while also providing a vitrifying flux means in the cement mix for effecting a sealing of any cracks that may form in the crust by reacting with any hot alloy flowing through such a crack to contain the leak as a metal spur.

Abstract: A combination of materials is disclosed which imparts superior fire retardant properties to organic polymers and the gaseous by-products of those polymers. The combination is made up of an organo phosphate plasticizer, aluminum hydroxide or alumina hydrate, antimony trioxide, a borate, a brominated hydrocarbon and a chlorinated paraffin.

Abstract: A diffusion furnace component system is disclosed which includes a liner, process tube, paddle and boat. These various elements are made up of a matrix of sintered silicon carbide which has been infiltrated with 5 to 30% by weight of silicon metal and finally coated with an impervious film or layer of a high purity refractory material such as e.g. silicon carbide.

Abstract: A refractory batt for supporting green ceramic or refractory ware during firing thereof, wherein said batt includes a groove or recess diagonally oriented in each quadrant, with the bottom of the recess or depression merging smoothly at the ends into the upper surface of the batt and spaced from the center and corner. The depth of the recess in each quadrant is not more than two thirds the thickness of the batt.

Abstract: An improved resin bonded grinding wheel composition is shown making use of a kyanite or sillimanite or andalusite filler or mixtures thereof. More particularly the grinding wheel is a hot pressed phenol formaldehyde wheel having an alumina-zirconia abrasive with a kyanite additive therein. These wheels can be used for heavy duty metal grinding and have been determined to be especially useful for the snag grinding of titanium metal.

Abstract: This invention relates to organically bonded abrasive articles that include grinding aids. It has been determined that when known grinding aids such as alkali metal sulphates and alkali metal chlorides are cofused in about eutectic proportions and added to thermoset resin bonded abrasive articles in the form of finely crushed particles having an approximate eutectic composition that an improved abrasive article results.

Abstract: An abrasive product and process is disclosed, for grinding titanium metal and its alloy. The product used to grind the titanium consists of a grinding wheel wherein the abrasive grains are aggregates of silicon carbide particles bonded together with a refractory bond such as silicon oxynitride or a silicate based material.

Abstract: A mullite containing cementing mix particularly suited for silicon carbide containing shapes is shown that is adapted to be initially activated when mixed with water and set by air drying so that it can subsequently permanently set by firing the mortar in situ. The mullite component is first mixed in a raw batch with ball clay, a chemically active alumina, bentonite, sodium silicate and a borosilicate glass frit and then after this composition is mixed with water and air dried, the cement is fired in place to react certain of the constituents in the mix and sinter the mullite phase in a bonded relation with the surface of the shapes being cemented in place. A refractory furnace liner or the like may thus be fabricated for example wherein the silicon carbide containing shapes forming the liner are held in place with an inert strongly adhering cement having substantially the same thermal expansion properties as the shapes being bonded.

Abstract: A corner key device is shown for use in a glass thermal pane structure assembly, the key device is used with longitudinally extending spacer means that may be formed into a rectangular spacing frame to hold the several sheets of glass forming the pane separated. The corner key means is made in the shape of a straight channel adapted to be telescopically interfitted with the spacer means and this straight lineup of channel shaped corner and spacer elements may then be coated on the outside of their walls with a layer of a hot melt sealant. Then the corner key devices are then bent at right angles to produce the rectangular frame adapted to engage the glass sheets around their perimeter to produce a seal between the glass sheets and spacer means and bind them together to form the finished thermal pane.

Abstract: A raw batch for a ramming cement is shown adapted to be fired in place to protect studded boiler tubes and the like. The fired cement includes a major proportion of a particulate chromia-magnesia spinel that is bonded in-situ with a clay phase including kaolinite and montmorillonite components and a reacted chromia and magnesia compound together with sodium hexametaphosphate.

Abstract: A novel raw batch and improved fired refractory cement is described. A bulk refractory grain mass is initially bonded with a fired bond, which upon being fired includes Si.sub.3 N.sub.4 and/or Si.sub.2 ON.sub.2 reaction component that better protects the ultimate high temperature sintered cement product from erosion when the cement is used as a liner for furnace walls, troughs, and runners that contain a flow of molten iron or slag, as well as induction furnaces which process corrosive slag.

Abstract: A resinoid bonded abrasive article in which the resinoid bond includes 5-80% by volume of an improved active filler or grinding aid. The active filler is a mixture of iron pyrites, potassium sulfate and an alkali haloferrate; the alkali haloferrate having the formula A.sub.x Fe.sub.y ++ Fe.sub.z +++ H.sub.x+2y+3z where A is an alkali metal, H is a halogen, x is a number from 1 to 10, y is a number from 0 to 1, z is a number from 0 to 1, and y and z are not zero at the same time. The fillers are present in the bond in a ratio of alkali-haloferrate-to-pyrites-to-potassium sulfate of 0.5:1:0.5.