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高压物理学报 2007

高温高压下Fe-Ni-C系合成金刚石的研究

DOI: 10.11858/gywlxb.2007.04.012, PP. 401-408

李和胜,李木森

Keywords: 人造金刚石,铁基触媒,粉末冶金,高温高压

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Abstract:

以工业纯单质铁粉和单质镍粉为主要原料，采用粉末冶金方法制备了Fe-Ni-C系反应体系，在六面顶压机上进行了金刚石合成实验。Raman光谱和X射线衍射结果表明，采用这种方法获得的粒径为200~500μm，呈六-八面体聚形的晶体为立方金刚石单晶。通过对常规力学性能的检测发现，金刚石的品位较高，超过SMD25级锯片级金刚石的要求。分析认为，高温高压下金刚石自Fe-Ni-C系形核是一个触媒不断溶解催化碳原子的过程。大量的实验结果可以证实，金刚石在Fe-Ni-C系长大所需的碳原子来自于在γ-(Fe，Ni)吸引作用下、从(Fe，Ni)3C中不断脱溶的碳。金属包覆膜在这一过程中不但起到了输送碳原子的作用，还以独特的方式促成了碳原子由sp2π杂化态向sp3杂化态的转变。

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