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一、前言 目前,人造大颗粒金刚石的具体方法很多,其中以静态高压下用细粒金刚石和适量的某些非金刚石物质——掺杂物(通称为“粘结剂”)作原料烧结成大颗粒多晶体(通称为“聚晶体”)金刚石为较有成效的方法。这种方法在七十年代受到人们极大的关注。 由于控制这种烧结过程的因素很多,例如压力、温度、时间和掺杂物,还有原料的粒度、形状和表面状态,以及烧结时的气氛和气压等等,致使对这种金刚石的形成机制难以较深入的研究,这有碍于探索具有较高耐磨、耐热等综合性能的多晶体金刚石的有效途径。
I. INTRODUCTION At present, there are many specific methods for man-made large granular diamonds, of which the raw material is sintered under high static pressure with fine-grained diamond and an appropriate amount of certain non-diamond materials (commonly known as “binders” Particulate polycrystalline (commonly known as “polycrystalline”) diamond is a more effective method. This method received great attention in the seventies. Due to many factors controlling the sintering process, such as pressure, temperature, time and dopants, as well as the particle size, shape and surface state of the raw materials, as well as the atmosphere and pressure during sintering, etc., the formation mechanism of such diamond It is difficult to conduct a more in-depth study, which impede the exploration of polycrystalline diamond with a comprehensive wear and heat resistance and other effective ways.