WC-Co硬质合金刀片热丝法金刚石薄膜涂层附着力

用热丝法研究了WC-6%Co硬质合金刀片金刚石薄膜涂层附着力。结果表明:采用温度为80℃,(HCl:HNO₃:H₂O)(体积比)为1:1:1溶液对硬质合金刀片表面去Co 15min后,经40μm金刚石粉及1.5μm金刚石加20μmTaC混合粉进行超声预处理,结果表明,沉积的金刚石薄膜与硬质合金刀片基底具有良好的附着力,而经40μm金刚石粉处理的薄膜涂层组织与附着力要好一些。

Adhesion of Diamond Coating on WC-6% Co for Cutting Tools by Hot Filament CVD

CVD diamond coating on WC-6%Co for cutting tools has been investigated. The substrates were etched by HCl:HNO₃:H₃O(volume fraction) 1:1:1 solution at 80℃ for 15min to remove the cobalt from the surface. In order to enhance diamond nucleation, ultrasonic scratching pretreatment was applied by using diamond powder with 40μm parti-cle and the mixture of diamond powder with 1.5μm particle and TaC powder with 20 μm particle. The diamond deposition was performed by the hot filament CVD method.Adhesion was checked using Rockwell hardness machine with a loading capacity of 1 500 N, the experimental results show that the adhesion of CVD diamond coating to WC-6%Co substrate by ultrasonic scratched with diamond powder of 40 μ m particle is better than that of the mixture of diamond powder with 1.5μm particle and TaC powder with 20μm particle.