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 language | English |
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Pages (from-to) | 17258-17265 |
Number of pages | 8 |
Journal | Ceramics International |
Volume | 44 |
Issue number | 14 |
DOIs | |
State | Published - 1 Oct 2018 |
Externally published | Yes |
Keywords
- Dry sliding
- Fracture toughness
- High temperature
- Sialon matrix composite
- Wear mechanisms