High-performance TiN reinforced Sialon matrix composites: A good combination of excellent toughness and tribological properties at a wide temperature range
High-performance TiN reinforced Sialon matrix composites: A good combination of excellent toughness and tribological properties at a wide temperature range
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高性能TiN增强Sialon基复合材料：在宽温度范围内优异的韧性和摩擦学性能的良好结合
DOI：
10.1016/j.ceramint.2018.06.185
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发表时间：
2018
影响因子：
5.2
通讯作者：
Liu Weimin
中科院分区：
文献类型：
--
作者：
Sun Qichun;Wang Zixi;Yang Jun;Liu Yulin;Liu Jiongjie;Qiao Zhuhui;Liu Weimin
TiN掺杂Sialon基复合材料具有优异的力学性能和摩擦学性能，是高温应用的潜在材料。本文的主要目的是研究TiN增强Sialon复合材料的力学性能和摩擦学性能，揭示其增韧和磨损机理。结果表明，TiN掺杂能显著提高材料的断裂韧性。当TiN含量为10wt%时，复合材料的断裂韧性在25 °C和800 °C时达到最大值，分别为6.2MPa m1/2和4.4MPa m1/2。此外，TiN增强Sialon复合材料在较宽的温度范围内表现出优异的摩擦学性能。特别是在200-800 °C时，添加30wt%TiN的复合材料的摩擦系数降低到0.46-0.60，磨损率比未添加TiN的材料降低约15-50倍。此外，根据裂纹扩展行为和摩擦学性能，揭示了增韧和磨损机制。裂纹扩展行为表明，裂纹偏转是主要的增韧机制。导热性能、力学性能的提高和摩擦化学反应是其减摩抗磨的主要机理。
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 m1/2and 4.4 MPa m1/2at 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.