预处理工艺对硬质合金表面形态的影响

Effect of Pretreatment Process on Morphology and Structure of Cobalt Cemented Tungsten Carbide

YG8硬质合金经稀硝酸水溶液化学侵蚀后，表面一定深度内的粘结相钴将被化学刻蚀掉，引起表层疏松。此外，经Ar－H2等离子体刻蚀后，在在一定厚度的表面脱碳层、影响层．还初步证实硬质合金表面经适当的化学脱钴处理和适当时间的等离子体刻蚀，其上沉积的金刚石膜与基体具有较高的附着性能。

Cobalt phase was chemically etched to certain depth beneath the surface and porous layer was formed after YG8 cemented carbide had been soaked in aqueous solution of dilute nitric acid. Decarburized layer and affected layer were formed with certain thickness when YG8 cemented carbide hadbeen etched by an argon-hydrogen plasma jet. Preliminary result shows that tbe adhesion property between CVD diamond film and YG8 cemented carbide pretreated by suitable composite processes abovementioned is quite high