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US 4,379,852 AGranted
Boride-based refractory materials
AssigneeDirector-General of Agency of Industrial Science and Technology
InventorsTadahiko Watanabe, Shinichi Kono
Life of this patent
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Abstract
The invention provides a novel highly refractory sintered body based on a tal diboride such as TiB.sub.2 or Mo.sub.2 B.sub.5 and W.sub.2 B.sub.5 containing a binder ingredient. The high-temperature performance of the sintered body is further improved by including an auxiliary additive ingredient selected from several carbides, nitrides, silicides and oxides such as WC, TiC, TaN, TiN, MoSi.sub.2, TiO.sub.2, Al.sub.2 O.sub.3, B.sub.2 O.sub.3 and the like in a limited amount.
Claims6
A refractory sintered body composed essentially of
- (a) at least 30% by weight of at least one metal boride selected from the group consisting of MB.sub.2 type diborides of titanium, vanadium, niobium, tantalum, chromium, molybdenum, manganese, zirconium, hafnium, and aluminum and M.sub.2 B.sub.5 type borides of molybdenum and tungsten,
- (b) from 0.01 to 50% by weight of at least one binder ingredient selected from the group consisting of the borides of nickel, iron, cobalt, manganese and titanium other than the MB.sub.2 type diborides and alloys of nickel and phosphorus, and
- (c) from 0.1 to 50% by weight of at least one additive ingredient selected from the group consisting of WC, TiC, TaC, NbC, VC, ZrO.sub.2, TiN, ZrN, TaN, and VN, the balance being substantially the metal boride of the component (a), or
- (d) the metal boride of the component (a) and up to 40% by weight, based on the sintered body, of at least one MB type boride of a metal selected from the group consisting of tantalum, niobium, tungsten, zirconium, hafnium, molybdenum, and vanadium.
1 more element
Dependencies are inferred from the claim text.