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In Situ Reaction Synthesis and Mechanical Properties of V 2 AlC
Author(s) -
Hu Chunfeng,
He Lingfeng,
Liu Mingyue,
Wang Xiaohui,
Wang Jingyang,
Li Meishuan,
Bao Yiwang,
Zhou Yanchun
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02774.x
Subject(s) - flexural strength , materials science , hot pressing , thermal shock , fracture toughness , composite material , grain size , ceramic , max phases , phase (matter) , analytical chemistry (journal) , in situ , compressive strength , chemistry , organic chemistry , chromatography
A dense V 2 AlC ceramic was synthesized by an in situ reaction/hot pressing method using V, Al, and C powders as starting materials. The reaction path was investigated. It was found that V 2 AlC was produced by a reaction between Al 8 V 5 and C. Single ‐phase V 2 AlC could be prepared using the optimized molar ratio of V:Al:C=2:1.2:0.9. The grain sizes of as‐prepared V 2 AlC samples were temperature dependent. On increasing the temperature from 1400° to 1700°C, the mean grain size of V 2 AlC increased from 49 μm in length and 19 μm in width to 405 μm in length and 106 μm in width. The V 2 AlC sample sintered at 1500°C exhibited the highest flexural strength of 289 MPa and a fracture toughness of 5.7 MPa·m 1/2 , while the V 2 AlC sample prepared at 1400°C showed the highest compressive strength of 742 MPa. The sample sintered at 1700°C possessed the highest damage tolerance. Additionally, V 2 AlC could retain a high degree of Young's modulus up to 1200°C. Below 800°C, V 2 AlC showed excellent thermal shock resistance.