Effect of Sintering Temperatures on the Reaction-Bonded Si3N4/SiC Composite Ceramics

Jun Li; Wen Jie Yuan; Shuo Wang; Hong Xi Zhu; Cheng Ji Deng

doi:10.4028/www.scientific.net/AMR.399-401.331

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 399-401Effect of Sintering Temperatures on the...

Effect of Sintering Temperatures on the Reaction-Bonded Si₃N₄/SiC Composite Ceramics

Abstract:

Effect of sintering temperatures on reaction-bonded Si3N4/SiC composite ceramics under pressureless was investigated. Si₃N₄/SiC composite ceramics were sintered at different temperatures from 1450 to 1700 °C under nitrogen atmosphere by using SiC with different particle sizes, Si and additives Y₂O₃ as raw materials. The phases, microstructure and mechanical property were characterized by XRD, SEM, and compressive strength tests. The results demonstrated that when the particle gradation consists of silicon carbide of 74 μm (5 wt.%), 44 μm (10 wt.%) and 0.5 μm(35 wt.%) and silicon powder of 74 μm (42 wt.%), the more dense samples with the bulk density of 2.43 g/cm³ and the higher compressive strength of 324 MPa could be obtained at the sintering temperature of 1550 °C for 3h as the optimum processing parameters.

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Periodical:

Advanced Materials Research (Volumes 399-401)

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331-335

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.399-401.331

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Online since:

November 2011

Authors:

Jun Li, Wen Jie Yuan, Shuo Wang, Hong Xi Zhu, Cheng Ji Deng

Keywords:

Micro-Composite, Reaction-Bonded, Si₃N₄/SiC, Sintering Temperature

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