| 摘要 |
PURPOSE:To obtain an sintered hard alloy which has the high heat resistant and is excellent in the thermal shock resistance and the toughness and endures the severe use conditions by consituting a rigid phase and a joined metallic phase wherein the rigid dispersion particles having the specified particle size are dispersed uniformly and finely. CONSTITUTION:The high heat resistant sintered hard alloy consisting of the rigid phase and the joined metallic phase and the rigid dispersion particles having 0.01%n3mum particle size are dispersed uniformly and finely in the above- mentioned joined metallic phase endures enough the use in a severe use conditions such as a rapid thermal cycling and the elevation in the surface temp. of a tool. As the above-mentioned rigid dispersion particles, one or more kinds among ThO2, Al2O3. ZrO2, Y2O3, SiO2, Al4O3, WC, SiC, Si3N4, AlN, YN, TiB2 and ZrB2 are used. Also as the above-mentioned rigid phase, the phase consisting of WC is suitable and as the joined metallic phase, the phase consisting of one or more kinds among Ni, Co, Fe, Cr, Mo and W are preferable. Furthermore it is desirable that the amount of the joined metallic phase is regulated to 10-35wt.% total amount and the amount of the rigid dispersion particles is regulated to 10-40 vol.% joined metallic phase.
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