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Effect of thermal stability of M n+1 AX n phases on microstructure and mechanical properties of M n+1 AX n /ZA27 composites
Author(s) -
Li HaiYan,
Tian Yuan,
Wan Detian,
Bao Yiwang,
Zhou Yang
Publication year - 2021
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13741
Subject(s) - materials science , microstructure , sintering , thermal stability , composite number , composite material , ceramic , phase (matter) , max phases , matrix (chemical analysis) , chemical engineering , engineering , chemistry , organic chemistry
Special layered structure endows ternary M n+1 AX n phase ceramics with good electrical and thermal conductivity, excellent abrasive resistance, and perfect thermal shock resistance. In this work, three kinds of M n+1 AX n phase ceramics (Ti 3 SiC 2 , Ti 3 AlC 2 , and Ti 2 SnC) were chosen to reinforce the ZA27 alloys, respectively. By employing “two‐step sintering” technology which is pressureless sintered at 870°C for 1 h firstly and then hot pressed at 500°C for 1 h, M n+1 AX n /ZA27 composites were successfully fabricated. The effects of thermal stability of the above M n+1 AX n on microstructure, mechanical properties, and friction performance of the three M n+1 AX n /ZA27 composites were investigated. The different reaction degrees between the three M n+1 AX n reinforcements and the ZA27 matrix were ascribed to the differences of chemical bond energy. The results demonstrated that at the sintering temperature of 870°C, Ti 2 SnC was completely reacted in Ti 2 SnC/ZA27 composite, and Ti 3 AlC 2 partially reacted in ZA27 matrix, while no reaction happened between Ti 3 SiC 2 and ZA27 matrix. Hence, the order of thermal stability for the three M n+1 AX n phases in ZA27 matrix is Ti 3 SiC 2 > Ti 3 AlC 2 > Ti 2 SnC. Besides, Ti 3 AlC 2 /ZA27 composites possess the best mechanical properties and wear resistance, which was attributed to interfacial reaction improved the boding between matrix and reinforcement.