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Thermal effects on the mechanical properties of SiC fibre reinforced reaction-bonded silicon nitride matrix composites

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Abstract

The elevated temperature four-point flexural strength and the room-temperature tensile and flexural strength properties after thermal shock were measured for ceramic composites consisting of 30 vol% uniaxially aligned 142 μm diameter SiC fibres in a reaction-bonded Si3N4 matrix. The elevated temperature strengths were measured after 15 min exposure in air at temperatures upto 1400 ° C. The thermal shock treatment was accomplished by heating the composite in air for 15 min at temperatures up to 1200 ° C and then quenching in water at 25 ° C. The results indicate no significant loss in strength properties either at temperature or after thermal shock when compared with the strength data for composites in the as-fabricated condition.

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Bhatt, R.T., Phillips, R.E. Thermal effects on the mechanical properties of SiC fibre reinforced reaction-bonded silicon nitride matrix composites. J Mater Sci 25, 3401–3407 (1990). https://doi.org/10.1007/BF00587704

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Keywords

  • Flexural Strength
  • Silicon Nitride
  • Thermal Shock
  • Strength Property
  • Ceramic Composite