Graphite–boron composite heater in a Kawai-type apparatus: the inhibitory effect of boron oxide and countermeasures

Longjian Xie, Akira Yoneda, Takashi Yoshino, Hongzhan Fei, Eiji Ito

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We have investigated the performance of a graphite–boron composite (GBC) with 3 wt % boron as a precursor for a boron-doped diamond heater in a Kawai-type apparatus at 15 GPa. We first tested a machinable cylinder of GBC sintered at 1000°C in Ar/H2 gas (99:1 molar ratio). Boron oxide (B2O3) formed during sintering frequently hindered the GBC heater from stable operation at temperatures higher than 1400°C by producing melt throughout the heater together with oxide and/or silicates. We then rinsed the GBC heater in hydrochloric acid to remove B2O3. After rinsing, we succeeded in stably generating temperatures higher than 2000°C. We also improved a molding process of different-sized GBC tubes for convenient use and tested the molded GBC heater. It was free from the B2O3 problem. The electromotive force of the W/Re thermocouple was successfully monitored up to 2400°C.

Original languageEnglish
Pages (from-to)1-16
Number of pages16
JournalHigh Pressure Research
DOIs
Publication statusAccepted/In press - Mar 23 2016

Keywords

  • boron-doped diamond
  • graphite–boron composite
  • Kawai-type apparatus

ASJC Scopus subject areas

  • Condensed Matter Physics

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