Details

Autor(en) / Beteiligte

• Li, Hai‐Yan
• Tian, Yuan
• Wan, Detian
• Bao, Yiwang
• Zhou, Yang

Titel

Effect of thermal stability of Mn+1AXn phases on microstructure and mechanical properties of Mn+1AXn/ZA27 composites

Ist Teil von

• International journal of applied ceramic technology, 2021-07, Vol.18 (4), p.1213-1221

Ort / Verlag

Malden: Wiley Subscription Services, Inc

Erscheinungsjahr

2021

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• Special layered structure endows ternary Mn+1AXn phase ceramics with good electrical and thermal conductivity, excellent abrasive resistance, and perfect thermal shock resistance. In this work, three kinds of Mn+1AXn phase ceramics (Ti3SiC2, Ti3AlC2, and Ti2SnC) 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, Mn+1AXn/ZA27 composites were successfully fabricated. The effects of thermal stability of the above Mn+1AXn on microstructure, mechanical properties, and friction performance of the three Mn+1AXn/ZA27 composites were investigated. The different reaction degrees between the three Mn+1AXn 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, Ti2SnC was completely reacted in Ti2SnC/ZA27 composite, and Ti3AlC2 partially reacted in ZA27 matrix, while no reaction happened between Ti3SiC2 and ZA27 matrix. Hence, the order of thermal stability for the three Mn+1AXn phases in ZA27 matrix is Ti3SiC2 > Ti3AlC2 > Ti2SnC. Besides, Ti3AlC2/ZA27 composites possess the best mechanical properties and wear resistance, which was attributed to interfacial reaction improved the boding between matrix and reinforcement.