A New Method to Improve the High-Temperature Mechanical Properties of Ti3SiC2 by Substituting Ti with Zr, Hf, or Nb
Abstract:Ti3SiC2 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 Ti3SiC2, Zr, Hf, or Nb were used as dopants in Ti3(SiAl)C2. At room temperature, the Zr-, Hf-, or Nb-doped Ti3(SiAl)C2 ceramics have comparable stiffness, hardness, strength, and fracture toughness with those of Ti3(SiAl)C2. At high temperatures, however, a significant improvement in stiffness and strength has been achieved for (Ti1−xTx)3(SiAl)C2 (T=Zr, Hf, or Nb). (Ti1−xTx)3(SiAl)C2 can retain high degrees of stiffness and strength up to 1200°C, which is 150°C higher than those for Ti3(SiAl)C2.
Document Type: Research Article
Affiliations: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Publication date: 2010-06-01