Microstructure of high chromium cast iron/TiC-SiC composites fabricated by infiltration method

doi:10.13251/j.issn.0254-6051.2022.11.038

Abstract

Abstract: High chromium cast iron/TiC-SiC composites were fabricated by SiC ceramic particles coating with TiC particles of few microns and pressureless infiltration under the protection of inert gas. The infiltration situation, microstructure characteristics and composition distribution were observed and analyzed by means of SEM/EDX. Finally, combined with the microstructure characteristics and infiltration behavior of high-chromium cast iron/Ti-SiC composites, the effect of TiC powder on infiltration behavior and composite structure was analyzed. The observation results show that Fe/Cr alloy cannot wet the preform SiC particles when TiC addition ≤10%(mass fraction, as follow), while the wettability between Fe/Cr alloy and preform is improved when TiC addition ≥ 20%, increasing the TiC content is more conducive to Fe/Cr alloy infiltration. The large-sized SiC particles in the matrix disappear, and strip-shaped elemental carbon with a size close to millimeters appeares, which is quite different from the microstructure of high-chromium cast iron/Ti-SiC composites. Comparing the microstructure of the two composite materials, it is found that the added Ti powder can combine with C to form TiC in the molten metal, while the added TiC particles are cobblestone-like in the microstructure with rounded edges, mutual dissolution between molten metal and ceramic particles occurs. During the infiltration process, the added TiC and Ti react differently with the infiltrated metal, and the high mass fraction of TiC can significantly promote the molten metal infiltration process.

Key words: metal-ceramic composites, SiC ceramic composite material, infiltration method, microstructure

CLC Number:

TG148
TG379

Zhu Junxuan, Yang Fan, Yin Mengtao, Liu Haiyun. Microstructure of high chromium cast iron/TiC-SiC composites fabricated by infiltration method[J]. Heat Treatment of Metals, 2022, 47(11): 216-222.

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