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High Pressure Sintering of Silicon Carbide with Mg-Cr3C2 Composite Additive

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Abstract:

Porous silicon carbide was sintered at 1300 °C/30 MPa for 2 h with 4 wt.% magnesium alloy and 4 wt.% chromium carbide composite additives. The sintered ceramic presented density of around 92% of the theoretical density. No new phase was observed after sintering. Mg segregates around chromium carbide particles in sintered ceramic. The silicon carbide particles were mainly bonded by melt magnesium alloy and chromium carbide diffused in solid state. The voids existed in the sintered ceramic, but much more fracture occurred in silicon carbide particles during bending due to high bonding strength of sintering necks. Some voids existed in the ceramic, which act as crack sources during fracture.

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Periodical:

Materials Science Forum (Volume 1035)

Pages:

768-772

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.1035.768

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Online since:

June 2021

Authors:

Jing Kun Li, Xue Ping Ren*, Qiang Yan, Yan Ling Zhang, Hong Liang Hou

Keywords:

Composite Sintering Additives, Hot Press Sintering, Silicon Carbide Ceramic

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© 2021 Trans Tech Publications Ltd. All Rights Reserved

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