采用热丝化学气相沉积(HFCVD)法,以甲烷和氢气为反应气体,在YGl3(WC-13%Co)硬质合金基体上制备了金刚石膜.膜中存在大量五重对称结构的正二十面体金刚石晶粒(IDC).当尺寸较小时晶粒为较完整的正二十面体形状,尺寸达微米级后晶粒为带有"沟槽"或"凹坑"的变种正二十面体形状.研究了IDC的形成机制,并进行了计算机模拟.结果表明:对于四面体立方结构来说,IDc的{111}孪晶面与正常{111}孪晶面相比存在2.87°的差异,孪晶面两侧原子几何位置失配,使其成为畸变孪晶面,这种畸变孪晶面导致IDC晶粒存在"凹坑"和"沟槽";IDC的晶核是正十二面体烷(C20H20).
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