Evolution and Mechanism of Friction and Wear Properties of Silicon Nitride Ceramics at High Temperature

Abstract

Abstract: Si₃N₄ ceramics have attracted much attention in the field of high temperature wear resistance because of high temperature resistance, corrosion resistance, wear resistance and hardness. In this paper, the plane friction and wear properties and mechanism of Si₃N₄ ceramics when wearing with C/SiC ceramics or GH214 superalloy at high temperature were investigated. The results show that the friction coefficient of Si₃N₄ ceramics against C/SiC ceramics increases first and then decreases with the increase of temperature. The average friction coefficient of Si₃N₄ ceramics at 1 200 ℃ is lower than 0.4, and wear marks, wear particles and SiO₂ oxide film appear on wear surface. The wear forms are mainly abrasive grain wear and oxidation wear. When Si₃N₄ ceramics and GH214 superalloy are worn against each other, the friction coefficient increases with the increase of temperature. Meanwhile, obvious metal oxide layer is formed on the surface of ceramic samples, so the wear forms are mainly adhesive wear and oxidation wear. During the friction process of Si₃N₄ ceramics and two kinds of friction materials, the oxide film produced by oxidation wear has protective and lubricating effects on Si₃N₄ ceramics, which can effectively reduce the wear of Si₃N₄ ceramics matrix and improve the wear life of Si₃N₄ ceramics.

Key words: Si₃N₄ ceramics, friction coefficient, plane friction and wear, wear mechanism, high temperature friction property

CLC Number:

TQ175

LIU Wenjin, ZHOU Guoxiang, YANG Zhihua, JIA Dechang. Evolution and Mechanism of Friction and Wear Properties of Silicon Nitride Ceramics at High Temperature[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 302-311.

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