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标题:In SituReaction Synthesis, Electrical and Thermal, and Mechanical Properties of Nb4AlC3
时间:2019-12-03 19:42:35
DOI:10.1111/j.1551-2916.2008.02424.x
作者:Chunfeng Hu;Fangzhi Li;Lingfeng He
关键词:phase thin-films;crystal-structure;pressing method;ti3sic2;ceramics;carbide;behavior;ta4alc3;ti3alc2;ti4aln3
出版源: 《Journal of the American Ceramic Society》 ,2008 ,91
摘要:In this work, a bulk Nb 4 AlC 3 ceramic was prepared by an in situ reaction/hot pressing method using Nb, Al, and C as the starting materials. The reaction path, microstructure, physical, and mechanical properties of Nb 4 AlC 3 were systematically investigated. The thermal expansion coefficient was determined as 7.2 × 10 −6 K −1 in the temperature range of 200°–1100°C. The thermal conductivity of Nb 4 AlC 3 increased from 13.5 W·(m·K) −1 at room temperature to 21.2 W·(m·K) −1 at 1227°C, and the electrical conductivity decreased from 3.35 × 10 6 to 1.13 × 10 6 Ω −1 ·m −1 in a temperature range of 5–300 K. Nb 4 AlC 3 possessed a low hardness of 2.6 GPa, high flexural strength of 346 MPa, and high fracture toughness of 7.1 MPa·m 1/2 . Most significantly, Nb 4 AlC 3 could retain high modulus and strength up to very high temperatures. The Young's modulus at 1580°C was 241 GPa (79% of that at room temperature), and the flexural strength could retain the ambient strength value without any degradation up to the maximum measured temperature of 1400°C.
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