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PDC材料烧结过程中钴在金刚石层中的扩散熔渗迁移机制

DOI: 10.11858/gywlxb.2004.01.010, PP. 53-58

Keywords: 聚晶金刚石复合片(PDC),烧结,扩散,熔渗

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Abstract:

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5.8GPa、1300℃条件下,钴的扩散系数D≈1.6×10-7cm2/s,是一般常压及相同温度条件下钴固相扩散系数(3×10-10cm2/s)和相同压力条件下钴的液相扩散系数(5×10-5cm2/s)的中间值;对于粒度W≥10μm的金刚石烧结体系,钴液熔渗作用时间非常短暂,略大于0.5s,而对于W≤1μm的超细金刚石烧结体系而言,钴熔渗作用时间为28s,比粒度W≥10μm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50μm/s和100μm/s。

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