Sintered cubic boron nitride and process for producing the same
AssigneeNgk Spark Plug Co., Ltd.
InventorsMasakazu Watanabe, Akiyasu Okuno, Isamu Fukuura, Yasushi Matsuo
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Abstract
Sintered cubic boron nitride consisting of 80 to 20% by volume of the following component (a), with the balance being essentially the following component (b), and a process for producing such nitride are disclosed: (a) cubic boron nitride; (b) a cermet containing the following sub-components (1), (2) and (3): (1) TiC and/or TiC-TiN, part of which may be replaced by a carbide, a nitride, a boride and/or a silicide of a transition metal of the group IVa, Va and VIa of the Periodic Table; (2) Fe, Co and/or Ni; and (3) Mo and/or Mo.sub.2 C.
Claims5
A sintered cubic boron nitride consisting of 80 to 20% by volume of the following component (a), with the balance being essentially the following component (b):
- (a) cubic boron nitride;
- (b) a cermet containing the following sub-components (1), (2) and (3):
- (1) about 65 to 92 wt % TiC and/or TiC-TiN, part of which may be replaced with up to 10 wt % of a carbide, a nitride, a boride and/or a silicate of a transition metal of the group IVa, Va and VIa of the Periodic Table;
- (2) about 5 to 15 wt % Fe, Co and/or Ni;
- and
- (3) about 3 to 20 wt % Mo and/or Mo.sub.2 C.
The sintered cubic boron nitride consisting of 80 to 20% by volume of the following component (a), with the balance being essentially the following component (b):
- (a) cubic boron nitride;
- (b) a cermet containing the following sub-components (1), (2), (3) and (4):
- (1) about 65 to 92 wt % TiC and/or TiC-TiN, part of which may be replaced with up to 10 wt % of a carbide, a nitride, a boride and/or a silicide of a transition metal of the group IVa, Va, and VIa of the Periodic Table;
- (2) about 5 to 15 wt % Fe, Co and/or Ni;
- (3) about 3 to 20 wt % Mo and/or Mo.sub.2 C;
- and
- (4) about 0.1 to 5 wt % Al, Al compound and/or Si.
A process for producing sintered cubic boron nitride consisting of 80 to 20% by volume of the following component (a), with the balance being essentially the following component (b), said process comprising mixing a powder of the component (a) with that of the component (b), and sintering a compact prepared by pressing in a die in a high pressure apparatus at a pressure of at least 45 Kb and a temperature of at least 1,350.degree. C.:
- (a) cubic boron nitride;
- (b) a cermet containing the following sub-components (1), (2) and (3):
- (1) about 65 to 92 wt % TiC and or TiC-TiN, part of which may be replaced with up to 10 wt % of a carbide, a nitride, a boride and/or a silicide of a transition metal of the group IVa, Va and VIa of the Periodic Table;
- (2) about 5 to 15 wt % Fe, Co and/or Ni;
- and
- (3) about 3 to 20 wt % Mo and/or Mo.sub.2 C.
Dependencies are inferred from the claim text.