八面腔压机中一定尺寸的二级压砧上运行的最大组装  

Maximum multianvil cell assembly running on WC anvils with certain size

作　　者：戴逸 王文丹 法志湘 王路 王菊 梁策 李星翰 Dai Yi;Wang Wen-Dan;Fa Zhi-Xiang;Wang Lu;Wang Ju;Liang Ce;Li Xing-Han(Institute of High Temperature and High Pressure,School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学物理科学与技术学院,高温高压研究所,成都610031

出　　处：《物理学报》2021年第14期202-210,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51402245,11902276);冲击波物理与爆轰物理国防科技重点实验室基金(批准号:JCKYS2019212007)资助的课题.

摘　　要：自八面腔静高压装置问世以来,一定尺寸的二级压砧上可获得的最大腔体体积一直是一个被忽略的问题.本工作通过八面体压腔的密封简化模型,计算出加载后密封边可流动空间的最大体积,进而确定出一定尺寸的二级压砧上可运行的最大腔体组装,并以边长为25.4 mm的二级压砧为例,计算了不同八面体边长与立方块截角边长的组合(八面体传压介质边长/二级压砧截角边长为18/11和25/17组装),不同八面体初始形状(八面体倒棱与否)加载后的密封边可流动空间的最大体积,并根据计算结果选定预密封条尺寸.在边长为25.4 mm的碳化钨立方块上,以叶腊石八面体为传压介质,对18/11和25/17组装进行压力标定实验.实验结果表明本工作中关于密封边体积的计算结果成立,同时在25.4 mm的碳化钨二级压砧上实现了25/17组装的稳定运行,获得接近厘米级的样品腔尺寸.Since the invention of split sphere multianvil apparatus,the maximum sample size that can be obtained on tungsten carbide(WC)anvils with a certain size has always been a neglected issue.The maximum volume of loaded gaskets and the maximum multianvil cell assembly operating on given size WC anvils are calculated by a simplified geometric model.As a concrete example,the maximum volume of loaded gaskets in different assemblies(18/11,25/17(octahedral edge-length/anvil truncation edge-length,in millimetre))and different initial shapes of octahedrons(octahedron chamfered or not)running on WC anvils with 25.4 mm edge-length are calculated.The maximum initial sizes of gaskets in different assemblies are also calculated according to the maximum volume of loaded gaskets.Using the pyrophyllite octahedron as the pressure transmission medium,the pressure calibration of 14/8,18/11,and 25/17 assembly are carried out on WC cubes,of which the edge-length is 25.4 mm,to verify the calculated results.The cell pressure is calibrated by in situ observing resistance change caused by phase transition of pressure calibration material at high pressure.All assemblies run stably and no blow-out phenomenon occurs.The experimental results show that the pressure transfer efficiency of 18/11 and 25/17 assembly with chamfered octahedron are better than previous reported results in the same pressure range.The experimental results also indicate that the calculations of the gasket in this work are valid.And the 25/17 assembly with chamfered octahedron can run stably on WC cube with 25.4 mm edge-length.In addition,using graphite tubes as heater,heating structure designs of different assemblies(14/8,18/11,25/17)are completed,in which the 14/8 assembly can achieve the highest temperature of 2300℃.The diameter of sample chamber is almost one centimeter in 25/17 assembly.This work contributes to the development of assembly techniques for secondary anvil made of polycrystalline diamond materials to obtain larger sample volumes under higher pressure con

关 键 词：八面腔静高压装置 密封边 压力标定 

分 类 号：TH69[机械工程—机械制造及自动化]