Abstract: Lamellar rare earth-iron-boron-based magnet alloy particles for a bonded magnet, having an intrinsic coercive force (iHc) of not less than 3.5 kOe, a residual magnetic flux density (Br) of not less than 9.5 kG, and a maximum energy product ((BH)max) of not less than 13 MGOe. These particles have an average major axial diameter of 60 to 500 &mgr;m, an average minor axial diameter of 50 to 460 &mgr;m, an average axis ratio (major axial diameter/minor axial diameter) of 1.1 to 10 and an average aspect ratio (major axial diameter/thickness) of 3 to 100. The magnet alloy particles have a residual magnetic flux density (Br) as high as not less than 10 kG, an intrinsic coercive force (iHc) as large as not less than 3.5 kOe and a maximum energy product ((BH)max) as large as not less than 13 MGOe, are used as a material for high-performance bonded magnets.

Abstract: A rare earth bonded magnet obtained by mixing two types of magnetic powders (A) and (B) in the present invention has a high residual magnetic flux density (Br), a large intrinsic coercive force (iHc) and a large maximum energy product ((BH)max) in spite of a low rare earth element content, and shows an excellent rust preventability. A rare earth-iron-boron type magnet alloy of the present invention has a residual magnetic flux density (Br) as high as not less than 10 kG, an intrinsic coercive force (iHc) as large as not less than 3.5 kOe and a large maximum energy product ((BH)max) and which has an excellent rust preventability.

Abstract: A melt-quenched thin-film alloy indicated by the alloy composition formulaR.sub.X Fe.sub.100-(X+Y+Z+W) Co.sub.W B.sub.Y V.sub.Zwherein: R represents Nd alone or a composite rare earth element containing at least 50 atomic % of Nd, where the atomic precentages being 9.ltoreq.X.ltoreq.12, 6.ltoreq.Y.ltoreq.10, 0.5.ltoreq.Z.ltoreq.3 and 5.ltoreq.W.ltoreq.16; and a process for producing a melt-quenched thin-film of an alloy for a bonded magnet comprising injecting a melt of an alloy indicated by the alloy composition formulaR.sub.X Fe.sub.100-(X+Y+Z+W) CO.sub.W B.sub.Y V.sub.Z(wherein: R represents Nd alone or a composite rate earth element containing at least 50 atomic % of Nd, where the atomic percentages being 9.ltoreq.X.ltoreq.12, 6.ltoreq.Y.ltoreq.10, 0.5.ltoreq.Z.ltoreq.3 and 5.ltoreq.W.ltoreq.16) via the pressure of an inert gas on the surface of a rolling roll for cooling, and then quenching said melt.

Abstract: This invention relates to a heat-resistant composite magnet comprising 2 to 30% by weight of an organic-inorganic compound binder containing boron and silicon and 70 to 98% by weight of the powder of one or more permanent magnets.This invention further relates to a method for producing a heat-resistant composite magnet, which comprises the steps of (a) adding the powder of one or more permanent magnets to a solution of an organic-inorganic compound binder containing boron and silicon dissolved in an organic solvent; (b) evaporating said solvent; (c) molding the resultant permanent magnet powder covered with said binder under a pressure of 0.1 to 5 tons/cm.sup.2 in the presence or in the absence of a magnetic field of 12,000-5,000 oersted, the molded product being heated at 200.degree.-450.degree. C. during the molding or after the molding; and (d) cooling the molded product.

Abstract: Metal nitride sintered moldings are produced by mixing metal nitride powders with an organosilicon compound or an organosilicon high molecular weight compound as a binder, molding the mixture into a desired shape and heating the formed molding under a non-oxidizing atmosphere to sinter the metal nitride powders.

Abstract: A heat-resistant composite material reinforced with continuous silicon carbide fibers is produced by forming a powdery ceramics matrix and the fibers into a composite, and pressing and heating the composite into a sintered composite. The composite material is excellent in the mechanical strength at a high temperature, heat resistance, oxidation resistance and corrosion resistance.

Abstract: Beryllium composite material reinforced with continuous silicon carbide fibers is obtained by bonding tightly continuous silicon carbide fibers obtained by baking spun fibers of organosilicon high molecular weight compound, with beryllium and its alloys as a matrix. The silicon carbide fiber-beryllium composite material is excellent in the mechanical strength, heat resistance and oxidation resistance, and is useful as a material for aerospace instrument and a material for nuclear industry.

Abstract: Heat resistant and super hard composite materials are produced by mixing more than 60% by weight of an organosilicon high molecular weight compound, the main skeleton components of which are silicon and carbon or an organosilicon high molecular weight compound, the main skeleton components of which are silicon and carbon and which contains foreign elements other than silicon, carbon, hydrogen and oxygen with not less than 40% by weight of metal material powders consisting mainly of at least one metal element, molding the mixture into a shaped article and baking the shaped article under a non-oxidizing atmosphere at a temperature of lower than the semi-melting point of the above described metal powders.

Abstract: Silicon carbide sintered moldings having a high flexural strength and various excellent properties are produced by mixing SiC powders with a binder of organosilicon low molecular weight compounds or organosilicon high molecular weight compounds, molding the mixture into a desired shape, heating the molding at a high temperature to form SiC sintered molding, impregnating the SiC sintered molding with the above described organosilicon compound and heating the impregnated SiC sintered molding, if necessary, said impregnation and heat treatment being repeated two or more times.