摘要
为了探明从ＳｉＣ生成金刚石这一过程中触媒作用的机理，有必要调查ＳｉＣ加不同金属在高压高温下的行为。在本工作中，以１６重量比混合的ＳｉＣ和铁粉经５．４～６．０ＧＰａ的高压力和１３００～１５００℃的高温处理２０ｍｉｎ后，样品的Ｘ射线衍射分析表明：所有实验条件下ＳｉＣ都发生了分解，并分别生成了Ｆｅ３Ｓｉ和Ｆｅ３Ｃ；温度越高，ＳｉＣ分解得越彻底，在温度高于１３７５℃的样品中，伴随Ｆｅ３Ｃ减少，有金刚石和石墨明显析出。扫描电镜观察表明：６．０ＧＰａ、１５００℃下所得的金刚石晶体具有完整的八面体晶形，平均粒度约５０μｍ。
In order to ascertain the mechanism of the effect of catalysts on the process of diamond formation from SiC, it is necessary to investigate the behaviour of the SiC admixed with different metallic catalysts under high pressure and high temperature. In this work, SiC and iron powders were mixed in weight ratio of 1∶6, and then treated at high pressure of 5 4～6 0GPa and temperature of 1300～1500℃ for 20min. X ray diffraction of the samples showed that SiC decomposed, and Fe 3C and Fe 3 Si formed respectively in the all experiments. The decomposition of SiC carried more thoroughly under higher temperature. Diamond and graphite prectipitated clearly above 1375℃ with the decreace of Fe 3C. Observation in a scanning electron microscope showed that diamond crystals obtained at 6 0GPa and 1500℃ have perfect octahedron shape, the average grain size is about 50 μm.
出处
《高压物理学报》
CAS
CSCD
北大核心
1997年第2期137-141,共5页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金
关键词
碳化硅
铁
高压高温
金刚石合成
触媒作用
silicon carbide, iron, diamond, high pressure and high temperature.
