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FABRICATION OF SiC_P/Si_3N_4 CERAMIC BY SPARK PLASMA SINTERING TECHNI-QUE AND IT’S MECHANICAL PROPERTIES

Yong Zhang

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Abstract

SiC/Si3N4 ceramic was fabricated by Spark Plasma Sintering(SPS)technique with Y2O3 and Al2O3 as sintering additives.The effect of SiC content,sintering temperature,pressure and holding time on density of samples was studied.The results show that the optimum conditions are:SiC content is 15%,sintering temperature is 1450℃,pressure is 50 MPa and the holding time is 5min,and a relative density of 99.2%,the Vickers hardness of 2012 HV,toughness of 8.64 MPa.m1/2,bending strength of 644 MPa could be obtained for samples with uniform grain size.The SiC grain induced transcrystalline fracture and nail function increase fracture toughness.

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What this paper is about

SiC/Si3N4 ceramic was fabricated by Spark Plasma Sintering(SPS)technique with Y2O3 and Al2O3 as sintering additives.The effect of SiC content,sintering temperature,pressure and holding time on density of samples was studied.The results show that the optimum conditions are:SiC content is 15%,sintering temperature is 1450℃,pressure is 50 MPa and the holding time is 5min,and a relative density of 99.2%,the Vickers hardness of 2012 HV,toughness of 8.64 MPa.m1/2,bending strength of 644 MPa could be obtained for samples with uniform grain size.The SiC grain induced transcrystalline fracture and nail function increase fracture toughness.

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Available abstract

SiC/Si3N4 ceramic was fabricated by Spark Plasma Sintering(SPS)technique with Y2O3 and Al2O3 as sintering additives.The effect of SiC content,sintering temperature,pressure and holding time on density of samples was studied.The results show that the optimum conditions are:SiC content is 15%,sintering temperature is 1450℃,pressure is 50 MPa and the holding time is 5min,and a relative density of 99.2%,the Vickers hardness of 2012 HV,toughness of 8.64 MPa.m1/2,bending strength of 644 MPa could be obtained for samples with uniform grain size.The SiC grain induced transcrystalline fracture and nail function increase fracture toughness.

Key concepts: Materials science, Spark plasma sintering, Sintering, Fracture toughness, Relative density, Ceramic, Vickers hardness test, Composite material

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FABRICATION OF SiC_P/Si_3N_4 CERAMIC BY SPARK PLASMA SINTERING TECHNI-QUE AND IT’S MECHANICAL PROPERTIES — Research Paper | ScholarLens