Abstract: A clad steel plate having tensile strength (TS) of 780 MPa or more, excellent bendability, collision resistance, and LME resistance. The clad steel plate having a base metal and a cladding metal on front and back surfaces of the base metal, and the chemical composition and microstructure of the base metal and the cladding metal being appropriately controlled so that the average Vickers hardness (HVL) of the cladding metal is 260 or less, the average Vickers hardness (HVL) of the cladding metal divided by the average Vickers hardness (HVB) of the base metal is 0.80 or less, the boundary roughness between the base metal and the cladding metal is 50 ?m or less at the maximum height Ry, and the number of voids at the boundary between the base metal and the cladding metal is controlled to 20 or fewer per 10 mm length of the boundary.

Abstract: A liquid crystal microprism array has a plurality of grooves formed on a surface of a transparent substrate, a plurality of spaces divided by ridges of the grooves, and a plurality of liquid crystal cells placed in the spaces.

Abstract: An optical recording disk in which a transfer layer having grooves made of ultraviolet setting resin is laminated on the surface of a substrate, and in which a recording layer is laminated on the transfer layer, the optical recording disk comprises a peeling protrusion projectingly provided on the inner circumferential side of the transfer layer.

Abstract: A magneto-optical recording disk comprises a transparent substrate on which a magneto-optical recording layer made of a rare earth-transition metal alloy having an uniaxial magnetic anisotropy is sandwiched by a pair of dielectric layers is characterized that the dielectric layers are deposited in an amorphous state by means of a low pressure sputtering method.

Abstract: A sintered aluminum nitride body is produced by adding to aluminum nitride powder at least one sintering aid selected from the borides, carbides, nitrides and fluorides of calcium, strontium, barium and rare earth metals and mixtures thereof in an amount of 0.01 to 10% by weight ofthe aluminum nitride, molding the mixture, and sintering in a non-oxidizing atmosphere.

Abstract: A sintered aluminum nitride body is produced by adding to aluminum nitride powder at least one sintering aid selected from the nitrides and hydrides of calcium, strontium and barium and mixtures thereof in an amount of 0.01 to 10% by weight of the aluminum nitride, molding the mixture, and sintering in a non-oxidizing atmosphere.

Abstract: A sintered body comprising on a weight basis, 100 parts of a mixture of 5-40% of titanium carbide and 95-60% alumina, and 0.01 to 5 parts of at least one oxide selected from the group consisting of gallium, barium, calcium, cerium, niobium, and strontium oxides is an improved material for magnetic head sliders. It is prepared by adding the oxide or carbonate of the specific metal to an alumina-titanium carbide mixture and hot press sintering the combined mixture.

Abstract: A honeycomb core diaphragm is described, which contains a honeycomb core made from a thin plate of beryllium or beryllium alloy which is produced by a super-rapid cooling method. Since the thin plate of beryllium or its alloy has a high modulus of elasticity and low density and, furthermore, is easily moldable, it can be easily molded to produce a honeycomb core having a high modulus of elasticity and low density.

Abstract: An aromatic polyamide comprising (1) a unit of the formula: ##STR1## and (2) a unit of the formula: ##STR2## and being excellent in strength, rigidity and heat resistance and improved in light resistance, flexibility and wear resistance, which can be produced by polycondensation of a diamine component comprising N,N'-bis(p-aminobenzoyl)-ethylenediamine and p-phenylenediamine, the content of the N,N'-bis (p-aminobenzoyl)ethylenediamine being from about 0.6 to 50 mol %, with a dicarboxylic acid component comprising terephthalic acid or its reactive derivative in a substantially equimolar amount to the diamine component in an amide polar solvent.

Abstract: A process for producing novel aromatic polyamides having excellent heat resistance, toughness and chemical resistance and further having improved solubility, molding properties and light resistance, which comprises polycondensing a mixed diamine consisting of piperazine and p-phenylenediamine with a substantially equimolar amount of terephthaloyl dihalide in at least one amide type polar solvent (e.g. hexamethylphosphoramide, N-methyl-2-pyrrolidone, alone or a mixture thereof), wherein said piperazine is contained in a ratio of 10 to 35 % by mol on the basis of the whole mixed diamine component, and fibers produced from the aromatic polyamides having high tenacity, flexing characteristics and wear resistance and further having improved elongation ratio, knot tensile strength, fatigue resistance and fibrillation resistance.