超硬材料網

　　摘要 本文研究了甲醇預處理方法對硬質合金襯底表面仰制Co催石墨化作用。將甲醇預處理方法融入到傳統的兩步處理方法中，提出了新的兩步預處理方法，通過電鏡和EDX等手段對預處理后的襯底表面形貌、成分進行了分析。采用偏壓增強熱絲CVD（HFCVD）法，在預處理后的襯底表面成功沉積了金剛石薄膜。并以制做鉆頭為例，驗證了兩步法對復雜形狀襯底的預處理及金剛石薄膜制備效果。研究結果表明：采用甲醇預處理方法能夠有效仰制Co對金剛石薄膜的不利影響，新的兩步預處理方法既能保證金剛石薄膜與襯底之間的附著強度，又非常適用于復雜形狀整體式回轉硬質合金刀具、拉拔模具等襯底，對于拓展金剛石涂層在涂層刀具領域的應用具有一定的參考作用。（金剛石與磨料磨具工程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．