Pyrophyllite,as a pressure transmitting medium,is one essential auxiliary ma-terial in the process of high temperature and high pressure diamond synthesis.With the rapid development of super hard material industry,more and more pyrophyllite are nee-ded for diamond synthesis,which induce serious environmental pollution.Therefore,it is urgent to systematically study the pressure transmitting medium for pyrophyllite,con-structing the structure-physical relation and then exploring new pressure transmitting me-dium materials.The thermal stability of Beijing Mentougou pyrophyllite and South Africa pyrophyllite was studied.First,the morphologies of both types pyrophyllite were charac-terized by SEM,and their components were analyzed by EDS technology.In addition,thermal stability was analyzed using XRD and TG.The structural evolution were obtained for two types pyrophyllite during annealing at 400 ℃,600 ℃,850 ℃ and 1100 ℃,respective-ly.The results show that there are differences in elemental composition,mineral compo-sition and thermal stability between Beijing Mentougou pyrophyllite and South Africa py-rophyllite,which may be the fundamental reason for their different pressure transfer per-formance.
关键词
叶蜡石/热稳定性/传压介质/热重分析/金刚石
Key words
pyrophyllite/thermal stability/pressure transfer medium/TG/diamond
维普
万方数据