The Research Institute for Iron, Steel and Other Metals of the Tohoku

Research Institute for Special Inorganic Materials

Mitsubishi Seiko Kabushiki Kaisha

Masaaki Hamano

Seishi Yajima

Mamoru Omori

Josaburo Hayashi

Hideo Kayano

Toetsu Shishido

Yoshio Hasegawa

Kimiyuki Kamino

Takehiro Yamane

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. This invention still further relates to a method for producing a heat-resistant composite magnet, which comprises the steps of (a) molding the powder of one or more permanent magnet at room temperature 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 oersteds; (b) dipping the molded product in a solution of an organic-inorganic compound binder containing boron and silicon; (c) drying the dipped product; (d) heating the dried product at 200.degree.-450.degree. C.; and (e) cooling the heated product.

Heat-resistant composite magnet and method for producing the same

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.

Method for producing metal nitride sintered moldings

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.

Method for producing heat-resistant composite materials reinforced with

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.

Method for producing composite materials consisting of continuous

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.

Heat resistant and super hard composite materials and a method for

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.

Growing community of inventors

Oharai, Japan

Masaaki Hamano