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　　摘要 本文研究了甲醇预处理方法对硬质合金衬底表面仰制Co催石墨化作用。将甲醇预处理方法融入到传统的两步处理方法中，提出了新的两步预处理方法，通过电镜和EDX等手段对预处理后的衬底表面形貌、成分进行了分析。采用偏压增强热丝CVD（HFCVD）法，在预处理后的衬底表面成功沉积了金刚石薄膜。并以制做钻头为例，验证了两步法对复杂形状衬底的预处理及金刚石薄膜制备效果。研究结果表明：采用甲醇预处理方法能够有效仰制Co对金刚石薄膜的不利影响，新的两步预处理方法既能保证金刚石薄膜与衬底之间的附着强度，又非常适用于复杂形状整体式回转硬质合金刀具、拉拔模具等衬底，对于拓展金刚石涂层在涂层刀具领域的应用具有一定的参考作用。（金刚石与磨料磨具工程2009年第一期）
　　
　　Abstract A methanol pretreating method was proposed to reduce the Co concentration on the surface of WC-Co substrate；also a new two．step chemical procedure combined with methanol pretreating method was put forward to increase the diamond nucleation density and the adhesion strength between the diamond films and the substrates．High quality diamond films were deposited on such pre—treated substrates by hot filament chemical vapor deposition(HFCVD)method using a mixture of acetone and hydrogen gases．The surface morphologies，nucleation density，diamond films and composition were observed with different techniques．Drilling bits were given as an example to verify the effect of the new two—step chemical procedure on the pretreatment of WC-Co substrate and diamond films．The results showed that the new two—step method increases the diamond nucleation density and enhance the adhesion strength greatly．The new two—step chemical procedure is very suitable for complex shaped substrates，such as rotational cutting tools and drawing dies，which may broaden the use of diamond coatings for coated tool applications．