摘要
通过分析二级6-8型大腔体静高压装置八面体压腔的受力状况,研制了一种使用成本低、尺寸大且易于加工的多晶金刚石-硬质合金复合二级(末级)顶锤(压砧).采用原位电阻测量观测Zr在高压下相变(α-ω,7.96 GPa;ω-β,34.5 GPa)的方法,标定了由多晶金刚石-硬质合金复合末级压砧构建的5.5/1.5(传压介质边长/二级顶锤锤面边长,单位:mm)组装的腔体压力.实验表明,自行研制的多晶金刚石-硬质合金复合末级压砧可使基于国产六面顶压机构架的二级加压系统的压力产生上限从约20 GPa提高到35 GPa以上,拓展了国内大腔体静高压技术的压力产生范围.应用这一技术,我们期望经过末级压砧材料与压腔设计的进一步优化,在基于国产六面顶压机的二级6-8型大腔体静高压装置压腔中产生超过50 GPa的高压.
In the present study, we analyse the mechanical structure for the two-stage anvil cell, and design the two-stage high pressure cell using diamond-cemented carbide compound as anvil-material. The diamond-cemented carbide compound material is synthesized using the 6 2500 ton cubic press in our laboratory. We sinter diamond/Co layer （φ30 mm 10 mm） on a WC-cobalt substrate （~30 mmx 13 mm） at high pressures and temperatures, then, we obtain the cubic anvils from the sintered cylindrical chunks by wire- electrode cutting. The diamond-cemented carbide compound anvil has three advantages over the traditional sintered diamond anvil： first, a scaled-up version of the sintered diamond anvil could be obtained by sintering the diamond/Co layer on a WC-cobalt substrate; second, the diamond-cemented carbide compound anvil is machined easily compared with the sintered diamond anvil; and third, the experimental cost using the diamond-cemented carbide compound anvils is much lower than using the sintered diamond anvil. Using the diamond-cemented carbide compound anvil, we design the two-stage 5.5/1.5 （octahedral edge-length/anvil truncation edge-length, in millimetre） assemble. Pressure calibration at room temperature is performed for the 5.5/1.5 assemble using the phase transitions of Zr （a-w, 7.96 GPa; w-β, 34.5 GPa） under high pressures. The pressure range of the two-stage apparatus besed on hinge-type cubic press is extended from 20 GPa to about 35 GPa using the 5.5/1.5 assemble. The pressure calibration for the two-stage apparatus using diamond-cemented carbide compound anvil is ongoing in our laboratory. We believe that the pressures above 50 GPa could be achieved using these anvils.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第18期87-93,共7页
Acta Physica Sinica
基金
国家自然科学基金科学仪器基础研究专项(批准号:11027405)
国家重点基础研究发展计划(批准号:2011CB808200)资助的课题~~
