白云石内衬材料在合成金刚石传压密封介质中的作用

EFFECT OF INNER LINER MATERIAL (DOLOMITE) ON SYNTHETIC DIAMOND

通过合成金刚石实验以及对经历高温高压作用前后传压密封材料中白云石内衬的薄片显微镜观测、X射线粉末衍射和化学分析等研究 ,发现白云石在合成金刚石的高温高压下基本稳定 ,但透入性劈理发育。说明高温高压下白云石易发生破碎而变形 ,其等静压流变特性是以透入性劈理形式表现出来的。其中的杂质SiO2 等形成科石英、普通辉石 ,有无定形碳质产生 ,没有游离CaO、MgO物相形成。依据研究结果提出白云石内衬材料在金刚石合成中起多种作用 ,能够提高传压密封介质材料的综合性能。

From the investigations on the inner liner material made up of mainly dolomite by slice, X radial powder diffraction and chemical analysis before and after high temperature and pressure, it is found that dolomite is stable under the conditions of high temperature and pressure.However permeating cleavage texture were developed. Therefore dolomite under high temperature and pressure is deformed through cracking. Flow transforming characteristics under static pressure are manifested with the permeating cleavage texture style. Impurities formed coesite and augite. Formless carbon appears, but there is no free CaO, MgO formed. According to the results it is suggested that dolomite inner liner takes much sort action and can improve the total performance of the material passing pressure and pressurizing on the process of synthesizing diamond. This result was important for the development of the material passing pressure and pressurizing for synthesizing diamond.