Study & preparation of compound pressure transmitting medium for pressless split-sphere high pressure apparatus

LONG Zhengxin; ZHENG Jianfeng; LI Peipei; XIE Ergaizhenweinuogeladuofu; CAO Dahu

doi:10.13394/j.cnki.jgszz.2017.6.0016

Volume 37 Issue 6

Dec. 2017

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Article Navigation > Diamond & Abrasives Engineering > 2017 > 37(6): 87-90

LONG Zhengxin, ZHENG Jianfeng, LI Peipei, XIE Ergaizhenweinuogeladuofu, CAO Dahu. Study & preparation of compound pressure transmitting medium for pressless split-sphere high pressure apparatus[J]. Diamond & Abrasives Engineering, 2017, 37(6): 87-90. doi: 10.13394/j.cnki.jgszz.2017.6.0016

Citation:

LONG Zhengxin, ZHENG Jianfeng, LI Peipei, XIE Ergaizhenweinuogeladuofu, CAO Dahu. Study & preparation of compound pressure transmitting medium for pressless split-sphere high pressure apparatus[J]. Diamond & Abrasives Engineering, 2017, 37(6): 87-90. doi: 10.13394/j.cnki.jgszz.2017.6.0016

Citation:

LONG Zhengxin, ZHENG Jianfeng, LI Peipei, XIE Ergaizhenweinuogeladuofu, CAO Dahu. Study & preparation of compound pressure transmitting medium for pressless split-sphere high pressure apparatus[J]. Diamond & Abrasives Engineering, 2017, 37(6): 87-90. doi: 10.13394/j.cnki.jgszz.2017.6.0016

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Study & preparation of compound pressure transmitting medium for pressless split-sphere high pressure apparatus

doi: 10.13394/j.cnki.jgszz.2017.6.0016

1. Jiangsu Xiyu Diamond Technology Co., Ltd., Changzhou 213001, Jiangsu, China;
2. Changzhou University, Changzhou 213001, Jiangsu, China;
3. Diamond Synthesis Technology Co., Ltd., St. Petersburg 197706, Russia

More Information

Rev Recd Date: 2017-10-22

Available Online: 2022-07-27

Abstract

Abstract

When synthesizing gem-grade diamonds with pressless split-sphere high pressure apparatus (BARS), the requirements on relative density of pressure transmitting medium is pretty high.To enhance the efficiency of pressure transmitting, the preparation of a compound medium, ZrO₂-NaCl, is studied through experiments.The influence of relative density on sealing effect and chamfering is analyzed and the pressure transmitting ability is enhanced by compound ZrO₂ with NaCl.It is found that the compound medium has higher transmitting efficiency than pyrophyllites and that only when the relative density is 92%, the apparatus could work safe and stable.It also requires additional sealing edge.In the end, 2-ct VS-level yellow gem-grade diamond single crystal is prepared on self-made BARS with ZrO₂-NaCl as pressure transmitting medium.
- gem-grade synthetic diamond single crystal,
- ZrO₂-NaCl,
- relative density,
- pressure transmitting efficiency