| 摘要 |
Thermal fatigue and shock resistant materials have been disclosed. Such materials have a thermal conductivity exceeding a minimal value as determined by Kmin=0.00102X2-0.03076X+0.5464, where Kmin is minimal thermal conductivity in the units of cal/cm.s.° K, and X is cobalt weight percentage. Cemented tungsten carbide with coarse tungsten carbide grains and a low cobalt content meet this criterion. The thermal conductivity of this type of cemented tungsten carbide may be further enhanced by using tungsten carbide of coarser grains and higher purity. By adjusting the tungsten carbide grain size and the cobalt content, a desired toughness and hardness may be achieved while still maintaining a relatively high thermal conductivity. Such materials have applications in forming inserts and other cutting elements.
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