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A New Method to Improve the High‐Temperature Mechanical Properties of Ti 3 SiC 2 by Substituting Ti with Zr, Hf, or Nb
Author(s) -
Wan DeTian,
He LingFeng,
Zheng LiLi,
Zhang Jie,
Bao YiWang,
Zhou YanChun
Publication year - 2010
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.1551-2916.2010.03637.x
Subject(s) - materials science , fracture toughness , composite material , stiffness , ceramic , titanium , dopant , doping , metallurgy , optoelectronics
Ti 3 SiC 2 shows a unique combination of the properties of both metals and ceramics. However, its stiffness and strength lose rapidly above 1050°C, which is the main obstacle for the high‐temperature application of this material. To improve the high‐temperature mechanical properties of Ti 3 SiC 2 , Zr, Hf, or Nb were used as dopants in Ti 3 (SiAl)C 2 . At room temperature, the Zr‐, Hf‐, or Nb‐doped Ti 3 (SiAl)C 2 ceramics have comparable stiffness, hardness, strength, and fracture toughness with those of Ti 3 (SiAl)C 2 . At high temperatures, however, a significant improvement in stiffness and strength has been achieved for (Ti 1− x T x ) 3 (SiAl)C 2 (T=Zr, Hf, or Nb). (Ti 1− x T x ) 3 (SiAl)C 2 can retain high degrees of stiffness and strength up to 1200°C, which is 150°C higher than those for Ti 3 (SiAl)C 2 .