High-performance TiN reinforced Sialon matrix composites: A good combination of excellent toughness and tribological properties at a wide temperature range

Qichun Sun, Zixi Wang, Jun Yang, Yulin Liu, Jiongjie Liu, Zhuhui Qiao, Weimin Liu

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

TiN-doped Sialon matrix composites are potential candidates for high temperature applications due to their excellent mechanical and tribological properties. The objectives of this work are to thoroughly research the mechanical properties and tribological behaviors of the TiN reinforced Sialon composites and reveal their toughening and wear mechanisms. Results show that the fracture toughness can be obviously enhanced by doping TiN. The fracture toughness of the composite with 10 wt% TiN reaches the maximum value of 6.2 MPa m1/2 and 4.4 MPa m1/2 at 25 °C and 800 °C, respectively. Moreover, TiN reinforced Sialon composites exhibit excellent tribological properties at a wide temperature range. Especially for the composite with 30 wt% addition of TiN at 200–800 °C, the friction coefficient reduces to 0.46–0.60, and the wear rate decreases about 15–50 times as compared to the material without TiN. In addition, the toughening and wear mechanisms are revealed on the basis of the crack propagation behavior and tribological properties. The crack propagation behavior indicates that crack deflection is the principal toughening mechanism. The enhancement of heat-conducting property, mechanical properties, and the tribo-chemical reaction are the main friction-reducing and anti-wear mechanisms.

Original languageEnglish
Pages (from-to)17258-17265
Number of pages8
JournalCeramics International
Volume44
Issue number14
DOIs
StatePublished - 1 Oct 2018
Externally publishedYes

Keywords

  • Dry sliding
  • Fracture toughness
  • High temperature
  • Sialon matrix composite
  • Wear mechanisms

Fingerprint

Dive into the research topics of 'High-performance TiN reinforced Sialon matrix composites: A good combination of excellent toughness and tribological properties at a wide temperature range'. Together they form a unique fingerprint.

Cite this