Abstract
The transverse-rupture strength and the hardness of TiC-(10∼30)%Mo2C-(10∼20)%Ni alloys were investigated in relation to the mean free path or the mean grain size of the carbide and the mean grain size of titanium carbide (occluded in the carbide). Various specimens with various microstructures were prepared by ball-milling and sintering at 1300∼1450°C for 1∼8 hr.The results obtained were as follows: (1) Transverse-rupture strength vs. mean free path curves showed a maximum in the same way as WC-Co alloy, when the mean grain size of titanium carbide was always kept constant. (2) Hardness decreased lineally with increasing logarithm of mean free path, and it decreased also slightly with increasing amount of Mo2C. (3) The mean grain size of carbide in sintered alloys seemed to be controlled, under a definite sintering condition, by the ratios of Mo2C/Ni and TiC/Mo2C.
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