PURPOSE: To enhance the strength and the toughness of an obtained hard alloy, by a method wherein the stock powder of a hard phase is reduced in the particle size thereof to a specific particle size or less and the part or all of the stock powder of a bonding metal is brought to an ultra-fine particulate powder to suppress particle growth during sintering.
CONSTITUTION: This hard alloy contains one kind or more compound among compounds each of which is constituted from one kind or more transition metal element belonged to the IV a, Va and VIa groups of the Periodic Table and one kind or more nonmetal element among B, C, N and O as a hard substance. On the other hand, one kind or more transition metal element among Cr, Mo, W, Fe, Co and Ni is used as a bonding metal. In this case, as the stock powder of the above mentioned hard phase, one with a particle size of 0.7μ or less is used while, as the part or all of the stock material of the bonding metal, an ultra-fine particulate powder with a particle size of about 1,000 or less is used to lower a sintering temp.
IYORI YUUSUKE
TAKAHASHI NORIO
| JPS5198609A | 1976-08-31 | |||
| JPS55152109A | 1980-11-27 | |||
| JPS51126309A | 1976-11-04 |
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