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Effect of ZrC additives on the microstructure and hardness of ZrN-ZrSi2 composite
Z. I. Zaki,S. H. Alotaibi,M. Alsawat,B. A. Alhejji 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.4
High-density zirconium nitride ZrN/ZrSi2 composite reinforced with different fractions of insitu formed ZrC were synthesizedby dynamic-compaction combustion synthesis from Zr–Si3N4–C powder blends. The effect of ZrC fractions, compressionloads, and delay time on the composite properties was investigated. ZrC additives were found to decrease the sample porosityand improve the sample hardness. Increasing the compression load greatly enhanced the sample hardness and reduced thesample porosity. The samples were characterized using XRD, SEM, hardness and porosity. The attained composite having 20wt% ZrC was found to furnish a highly homogeneous microstructure with less than 1.0 vol open porosity and a maximumhardness value of 1308 HV achieved at 234 MPa compression load.