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Journal of Materials Science

, Volume 29, Issue 12, pp 3309–3315 | Cite as

An internal synthesis method for mullite-chromium carbide composite in a vacuum system

  • C. T. Ho
Article

Abstract

In situ formation of chromium carbide in a mullite matrix through reaction of Cr2O3, SiC and A2O3 has been studied. Three different chromium compounds, Cr3Si, Cr3C2, Cr7C3, and mullite were formed. In a vacuum environment, the Cr3Si particles formed first and were retained below 1550 °C, while the Cr7C3 phase was only dominant above 1600 °C. The Cr3C2 phase was the dominant dispersed phase at temperatures of 1450–1500 °C. In an argon environment, the Cr3C2 phase was the main product component at temperatures ranging from 1450 to 1550 °C. The mullite phase formed concurrently through the diffusion of the SiO2 phase into the Al2O3. SiO2 was the product of the reaction between Cr2O3 and SiC. The composite hot-pressed at 1450 °C in vacuum gave a flexural strength and fracture toughness of up to 457 MPa and 4.1 MPa m1/2, respectively.

Keywords

SiO2 Carbide Chromium Al2O3 Fracture Toughness 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • C. T. Ho
    • 1
  1. 1.Department of Mechanical EngineeringNational Yun-Lin Polytechnic InstituteYun-LinTaiwan

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