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 journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    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)105-120
    Number of pages16
    JournalHigh Pressure Research
    Volume36
    Issue number2
    DOIs
    Publication statusPublished - Apr 2 2016

    Keywords

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

    ASJC Scopus subject areas

    • Condensed Matter Physics

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