Effect of Ti Content on the Microstructure and Properties of TiC/TiB₂-FeNiCr Composite Prepared by Thermite Reaction

Abstract:

TiC/TiB₂-FeNiCr composite reinforced by TiC and TiB₂ composite ceramic particles was successfully in-situ synthesized using thermite reaction. The effects of Ti content in the raw material on the microstructure and properties of the composite were studied. The microstructure was investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). The hardness, compressive strength and wear resistance were tested using the Vickers indentation method (HXZ-1000), mechanical testing machine (SANS5105) and the high temperature wear tester (HT-600), respectively. The results show that the composite is mainly consisted of TiC, TiB₂, Cr₇C₃, α-FeNiCr and NiAl. The content of TiC and TiB₂ is increased with the Ti content. The hardness and compressive strength of the composite is increased first and then decreased. They attain the maximum value at about 8.0wt%Ti. The hardness and the compressive strength of the composite are 1313.25HV and 2725.57MPa at 8.0% Ti. Also the wear resistance of the composite is good, and the weight wear loss at 8.0% Ti is nearly fifth of the mass loss of steel.

• Periodical: Materials Science Forum (Volume 789)
• Pages: 403-408
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.789.403
• Online since: April 2014
• Authors: Yang Liu*, Wen Jun Xi, Shu Jie Li
• Keywords: Composite, Thermite Reaction, Ti Content, TiC/TiB₂-FeNiCr

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