Abstract: A method of preparing a magnetic member composed of a non-magnetic substrate carrying a magnetic film of a transition metal-rare earth alloy comprising decomposing a rare earth metal compound below 1000.degree. C to form a layer of rare earth metal on a substrate, decomposing a transition metal compound below 1000.degree. C to form a layer of transition metal on the deposited rare earth metal, heating the metals to form an alloy thereof which has its preferred axis of magnetization substantially aligned and in a direction perpendicular to the plane of the substrate and magnetizing the film.

Abstract: A polycrystalline silicon nitride body is produced by shaping a particulate mixture of silicon powder and boron into a green body, sintering the body to a density ranging from 60% to 75% of the theoretical density of silicon, said sintered body having pores which are interconnecting and open to the surface of the body, and reacting said sintered body with gaseous nitrogen to convert it to silicon nitride.

Abstract: Abrasive particles are prepared by milling cubic boron nitride particles, metal compound and milling balls to smear a coating of the compound on the cubic boron nitride particles and firing the compound-coated boron nitride particles producing a rough granular adherent covering of metal and/or metal boride and/or nitride surface coating chemically bonded to the cubic boron nitride surface by metal boride and/or nitride.

Abstract: A method of making a dense silicon carbide ceramic is disclosed involving the steps of homogeneously dispersing silicon carbide with a sufficient amount of a boron containing additive and a carbonaceous additive, forming the powder mixture into a shaped green body and then sintering the body in a controlled atmosphere and in the absence of external pressure at a temperature of about 1900.degree.-2100.degree. C. such that density of the body is at least 85% of the theoretical density of silicon carbide. The complex shaped silicon carbide product formed thereby is also disclosed.

Abstract: A polycrystalline boron carbide sintered body containing beryllium carbide with a density ranging from 85% to 96% of the theoretical density of boron carbide and having a uniform microstructure of equiaxed grains.

Abstract: Polycrystalline silicon carbide with increased electrical conductivity at room temperature is produced by shaping a particulate mixture of .beta.-silicon carbide, boron additive, beryllium carbide and a carbonaceous additive into a green body and sintering the body producing a sintered body having a density of at least about 85% of the theoretical density of silicon carbide.

Abstract: A method to reduce the growth rate of localized tool wear at the depth-of-cut line by the enrichment of the cutting zone atmosphere with gaseous oxygen.

Abstract: Cubic boron nitride (CBN) crystals of graded particle size are chemically cleaned and disposed in a protective metal cup together with a mass of substrate source material and a concentration of metal for providing an alloy for infusing and wetting the walls of capillary-size voids. The CBN content is increased in density to greater than 70% by volume and placed within a semi-isostatic system of finely-divided powder. Pressure in the range of from about 20,000 to about 100,000 psi is applied semi-isostatically to the system and thereby to the metal cup and its contents. Heat and pressure are then simultaneously applied to the semi-isostatic system. Liquefied infusing and wetting alloy enters the interstices between the CBN crystals to bond them together. The entire system is cooled and the strong composite body of metal-bonded CBN directly bonded to a substrate is recovered therefrom.

Abstract: Alloys of Co-Si-X, where X is selected from the group consisting of Al, Ga or alloys thereof, are directionally solidified to produce aligned eutectics.

Abstract: Alloys of Co-Si-X, where X is selected from the group consisting of Ta, Nb, V or alloys thereof, are directionally solidified to produce aligned eutectics.

Abstract: Alloys of Co-Si-X, where X is selected from the group consisting of W, Mo or alloys thereof, are directionally solidified to produce aligned eutectics.

Abstract: A dense silicon carbide material having improved electrically conducting properties is disclosed which is prepared by forming a homogeneous dispersion of silicon carbide, a sufficient amount of a boron containing additive, and 3.5-10.0% by weight of silicon nitride and hot pressing the dispersion at a sufficient temperature and pressure whereby a dense substantially nonporous ceramic is formed. The silicon carbide material can be machined by electrical discharge machining or by electrochemical machining.

Abstract: A method for making thin, substantially uniform and self-supporting polymer films by forming a solution of a base polymer, a surface-active block copolymer and a solvent, and forming a film from said solution by contacting it with film-forming means. The block copolymer contains at least two polymerized comonomers, one of which is compatible or substantially miscible with the base polymer and serves to distribute the block copolymer therein and the second of which is sufficiently surface-active in the resulting polymer solution to produce a solution having a surface tension sufficiently low to allow the formation of useful films less than 50 microns in thickness.

Abstract: A dense silicon carbide material having improved electrically conducting properties is disclosed which is prepared by forming a homogeneous dispersion of silicon carbide, a sufficient amount of a boron containing additive, and 3.5-10.0% by weight of silicon nitride and hot pressing the dispersion at a sufficient temperature and pressure whereby a dense substantially nonporous ceramic is formed. The silicon carbide material can be machined by electrical discharge machining or by electrochemical machining.

Abstract: A dense silicon carbide material having improved electrically conducting properties is disclosed which is prepared by forming a homogeneous dispersion of silicon carbide, a sufficient amount of boron nitride, and optionally a boron containing additive and hot pressing the dispersion at a sufficient temperature and pressure whereby a dense substantially nonporous ceramic is formed. The silicon carbide material can be machined by electrical discharge machining or by electrochemical machining.

Abstract: A continuous process for producing novel aligned composites of a Co-Si eutectoid type alloy having significant tensile strength is provided. The process comprises forming a melt of a Co.sub.3.sub.-x M.sub.x Si.sub.1.sub.-y N.sub.y alloy where M represents certain elements substituting for Co and x has a value ranging up to 0.6, where N represents certain elements substituting for Si and y has a value ranging up to 0.2, unidirectionally cooling said melt through a thermal gradient at a velocity which produces a solid having elongated columnar macro-grains aligned substantially parallel to each other, and unidirectionally cooling said macro-grain solid through said thermal gradient at said velocity which on reaching transformation temperature directionally transforms said solid into an aligned solid composite consisting essentially of at least two phases, the ratio of said thermal gradient to said velocity being greater than 150.degree.C/cm.sup.2 /hr.

Abstract: A method of producing a permanent magnet composite with substantially predetermined magnetic properties and geometry. A number of premagnetized modules of substantially the same size and having substantially the same properties are joined in contact together to produce the permanent magnet composite. Each premagnetized module is characterized by an intrinsic coercive force H.sub.ci significantly higher than its ordinary coercive force H.sub.c, and is magnetized along its easy axis of magnetization.