Synthesis and performance of nano-polycrystalline diamond
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摘要:
传统多晶金刚石聚晶(polycrystalline diamond,PCD)已在机械加工和矿物勘探等领域广泛应用,但其所使用的结合剂或烧结助剂严重弱化PCD性能,限制其应用。新型无黏结剂纳米金刚石聚晶(nano-polycrystalline diamond,NPD)具有细小的晶粒尺寸和高强度的金刚石晶粒界面,其性能已全面超越传统的PCD和金刚石单晶,在硬质材料高精加工等领域有巨大的优势和广阔的前景。本文概述NPD的合成和性能,并介绍使用不同的碳前驱物在高温高压下制备NPD的方法和技术,其中重点介绍石墨和碳纳米葱(carbon onions)在高温高压下直接转变成NPD的技术,为进一步研究及应用提供参考。
Abstract:Traditional polycrystalline diamond (PCD) has been widely used in the fields of mechanical processing and mineral exploration. However, due to the existence of binders or sintering aids, the deterioration of mechanical properties greatly limits its applications. Nano-polycrystalline diamond (NPD), which is non-adhesive with ultra-fine grain size and strong grain boundary, performs excellent properties superior to those of traditional PCD and single diamond in the field of high precision machining hard materials, etc. Hereby, the synthesis routes and mechanical properties of NPD are reviewed. The method and technology of preparing NPD from different carbon precursors under high temperature and high pressure (HPHT) are introduced. It is focused on the technology of direct converting graphite and carbon onions to NPD, which will provide reference for further research on its synthesis and application.
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