Preparation and pressureless sintering of chemical vapour deposited SiC-B composite powder

Lidong Chen, Takashi Goto, Toshio Hirai

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

SiC-B composite powder was prepared by chemical vapour deposition (CVD) using (CH3)2SiCl2+ B2H6+ H2 as source gases at 1673 K. The powder was β-type polycrystalline silicon carbide containing several per cents of boron and carbon. The boron content increased from 0 to 7.7 mass % as the B2H6 gas concentration increased from 0 to 0.7 mol %. Boron and carbon in amorphous form dispersed homogeneously in the β-SiC polycrystalline particles. The particles were spherical, non-agglomerated and uniform in size with an average particle size of about 50 nm. Sintering tests were performed with the resulting composite powder without applying pressure. Powder containing 1 mass % boron and 2 mass % carbon was sintered to a density of 3.16 × 103 kg m-3 at 2273 K, and the Vickers hardness of the sintered body was 30 GPa. When the sintering temperature was higher than 2323 K, significant grain growth due to the phase transformation from β to α form occurred, which decreased bulk density and Vickers hardness.

Original languageEnglish
Pages (from-to)679-683
Number of pages5
JournalJournal of Materials Science
Volume31
Issue number3
DOIs
Publication statusPublished - 1996 Jan 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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