초록 ▼

The invention provides a novel highly refractory sintered body based on a tal diboride such as TiB 2 or Mo 2 B 5 and W 2 B 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 c

The invention provides a novel highly refractory sintered body based on a tal diboride such as TiB 2 or Mo 2 B 5 and W 2 B 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 2, TiO 2, Al 2 O 3, B 2 O 3 and the like in a limited amount.

대표청구항 ▼

1. 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 2 type diborides of titanium, vanadium, niobium, tantalum, chromium, molybdenum, manganese, zirconium, hafnium, and aluminum and M 2 B 5 type bori

1. 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 2 type diborides of titanium, vanadium, niobium, tantalum, chromium, molybdenum, manganese, zirconium, hafnium, and aluminum and M 2 B 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 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 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. 2. The refractory sintered body as claimed in claim 1 wherein the binder ingredient as the component (b) is selected from the group consisting of MnB, TiB, NiB, Ni 4 B, CoB and FeB. 3. The refractory sintered body as claimed in claim 1 in which the balance is substantially the metal boride of the component (a). 4. The refractory sintered body as claimed in claim 1 in which the balance is substantially the metal borides of the component (d). 5. The refractory sintered body of claim 1 or claim 4 which contains MB 2 type titanium diboride. 6. The refractory sintered body of claim 1 having a bending strength greater than 200 Kg/mm 2, and a Vickers hardness of at least 2000 at 1000° C.