Method for manufacturing heat-resistant reinforced composite materials

Claim 1

A method for manufacturing heat-resistant reinforced composite materials having a fibrous structure which comprises: A. providing a mixture of: (a) 99.8 to 90 percent by weight of a first component selected from the group consisting of nitrides and carbides of aluminum, silicon and boron and mixtures thereof, said first component being 0.2 to 3.0 microns in average particle size, and (b) 0.2 to 10 percent by weight of a second component selected from the group consisting of oxides of scandium, yttrium and elements of the lanthanum series and mixtures thereof, said second component being 0.1 to 2.0 microns in average particle size, B. molding said mixture by pressure into a desired form, and C. sintering the molded mass without application of pressure thereon in at least one gas selected from the group consisting of nitrogen, ammonia and inert gas at a temperature as specified below with respect to the first component contained in said mixture: aluminum nitride -- 1600° to -- 2200° C silicon nitride -- 1500° to -- 1900° C boron nitride -- 1700° to -- 2200° C aluminum carbide -- 1700° to -- 2300° C silicon carbide -- 1600° to -- 2200° C boron carbide -- 1800° to -- 2200° C

Claim 2

A method for manufacturing heat-resistant reinforced composite materials having a fibrous structure which comprises: A. providing a mixture of: (a) 99.8 to 90 percent by weight of a first component selected from the group consisting of nitrides and carbides of aluminum, silicon and boron and mixtures thereof, said first component being 0.2 to 3.0 microns in average particle size, and (b) 0.2 to 10 percent by weight of a second component selected from the group consisting of oxides of scandium, yttrium and elements of the lanthanum series and mixtures thereof, said second component being 0.1 to 2.0 microns in average particle size, B. molding said mixture by pressure into a desired form, and C. sintering the molded mass without application of pressure thereon in at least one gas selected from the group consisting of nitrogen, ammonia and inert gas at a temperature as specified below with respect to the first component contained in said mixture: aluminum nitride -- 1600° to -- 2200° C silicon nitride -- 1500° to -- 1900° C boron nitride -- 1700° to -- 2200° C aluminum carbide -- 1700° to -- 2300° C silicon carbide -- 1600° to -- 2200° C boron carbide -- 1800° to -- 2200° C

Claim 6

A method for manufacturing heat-resistant reinforced composite materials having a fibrous structure which comprises: A. providing a mixture of: (a) 99.3 to 80 percent by weight of a first component having 0.2 to 3.0 microns in average particle size, said first component being aluminum nitride, (b) 0.2 to 10 percent by weight of a second component selected from the group consisting of oxides of scandium, yttrium, and elements of the lanthanum series and mixtures thereof, said second component being 0.1 to 2.0 microns in average particle size, and (c) 0.5 to 10 percent by weight of a third component having 0.1 to 2.5 microns in average particle size, said third component being silicates, B. molding said mixture by pressure into a desired form, and C. sintering the molded mass without application of pressure thereon in at least one gas selected from the group consisting of nitrogen, ammonia and inert gas at a temperature of from 1600° to 2200° C.

Claim 7

A method for manufacturing heat-resistant reinforced composite materials having a fibrous structure which comprises: A. providing a mixture of: (a) 99.3 to 80 percent by weight of a first component having 0.2 to 3.0 microns in average particle size, said first component being aluminum nitride, (b) 0.2 to 10 percent by weight of a second component selected from the group consisting of oxides of scandium, yttrium, and elements of the lanthanum series and mixtures thereof, said second component being 0.1 to 2.0 microns in average particle size, and (c) 0.5 to 10 percent by weight of a third component having 0.1 to 2.5 microns in average particle size, said third component being silicates, B. molding said mixture by pressure into a desired form, and C. sintering the molded mass without application of pressure thereon in at least one gas selected from the group consisting of nitrogen, ammonia and inert gas at a temperature of from 1600° to 2200° C.