Diffusion and Infiltration Mechanisms of Cobalt through Diamond Layer during the Sintering of Polycrystalline Diamond Compacts
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摘要: 讨论了PDC材料烧结过程中钴在金刚石层中的固相扩散、钴液熔渗、两次钴高浓度峰的波浪式迁移过程中的运动规律及其作用机制,并根据实验观测的数据进行了有关计算。结果表明:在5.8 GPa、1 300 ℃条件下,钴的扩散系数D1.610-7 cm2/s,是一般常压及相同温度条件下钴固相扩散系数(310-10 cm2/s)和相同压力条件下钴的液相扩散系数(510-5 cm2/s)的中间值;对于粒度W10 m的金刚石烧结体系,钴液熔渗作用时间非常短暂,略大于0.5 s,而对于W1 m的超细金刚石烧结体系而言,钴熔渗作用时间为28 s,比粒度W10 m的金刚石烧结要长得多;两次钴高浓度峰的迁移速度分别约为50 m/s和100 m/s。
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关键词:
- 聚晶金刚石复合片(PDC) /
- 烧结 /
- 扩散 /
- 熔渗
Abstract: The mechanisms of solid cobalt diffusion, molten cobalt infiltration and two wave-like cobalt peaks movement through diamond layer during the sintering process were discussed theoretically according to the experiment data. Results show that the solid cobalt diffusion coefficient under 5.8 GPa and at 1 300 ℃ is about 1.610-7 cm2/s, which is almost the mean value between the solid cobalt diffusion coefficient (310-10 cm2/s) at the same temperature under atmospheric pressure and the liquid cobalt diffusion coefficient (510-5 cm2/s) under 5.8 GPa and at 1 300 ℃. It also shows that the infiltration time of molten cobalt through diamond layer for diamond grain size 10 m and 1 m are about 0.5 s and 28 s respectively, and the moving velocity of the two wave-like cobalt peaks were about 50 m/s and 100 m/s, respectively.-
Key words:
- polycrystalline diamond compacts (PDC) /
- sintering /
- diffusion /
- infiltration
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