Abstract: A refractory ramming mix for forming linings for containers of molten metal contains graded refractory grains size to minimize porosity, optional sintering aids or fluxes, and aluminum powder in the amount of 1 to 15% by volume.

Abstract: Uniaxial hot-pressing of ceramic powders to produce monolithic shapes of non-uniform thickness is accomplished by employing a form, preformed to a shape which when properly oriented and uniaxially compressed to final density will deform orderly to assume the final desired shape, and hot-pressing it in a mold against preformed parts having surfaces exactly mating with the surfaces of the preform. Such mold parts have the same compaction ratio as the preform, and a coefficient of thermal expansion substantially equal to that of the preform, and are formed of a powdered composition which is non-reactive with the preform material under hot-pressing conditions. Suitable compositions for the mold part preforms are temporarily bonded mixtures of carbon or graphite powder and a powder material of the preform. The shapes may be slip cast or cold pressed and temporary binders of organic or inorganic material may be employed to give green strength to the parts.

Abstract: A process for simultaneously upgrading arc furnace crude production of titanium diboride, titanium carbide and mixtures thereof by reacting the carbon present therein with boron trioxide and titanium oxide or with titanium dioxide alone while simultaneously hot pressing the reactants whereby to densify the resulting plate to maximize its modulus of elasticity and modulus of rupture for use in armor constructions, to form a hard ceramic plate adapted to be integrated with a fiber glass layer in the fabrication of armor.

Abstract: Process tube, paddle, and boat for a semi-conductor diffusion furnace composed of a matrix of high purity sintered silicon carbide which is made impervious to gases by impregnation thereof with silicon metal which is 99.9% pure. The process tube, paddle and boat provide the ultra pure environment needed for semi-conductor production and are highly resistant to the degradative effect of a great number of high temperature heating cycles.