A novel method to prepare self-lubricity of Si3N4/Ag composite: Microstructure, mechanical and tribological properties

作者：Liu, Jiongjie; Wang, Zixi; Yin, Bing; Yang, Jun; Sun, Qichun; Liu, Yulin; Tan, Hui; Qiao, Zhuhui^*

来源：Journal of the American Ceramic Society, 2018, 101(9): 3745-3748.

DOI：10.1111/jace.15569

• in situ reinforcement
• mechanical and tribological properties
• nano-Ag particles
• Si3N4
• Ag composite

Si3N4/Ag composites were firstly prepared through SPS technology, using Si3N4 and AgNO3 as raw materials. Utilizing the coordination bonding of Ag+ ions with nitrogen atoms of Si3N4, in situ generated Ag particles about 1 m were tightly anchored on Si3N4 surface, thereby preventing the outflow of silver during sintering process. Meanwhile, smaller silver particles about 20 nm were located at the grain boundaries of Si3N4, which effectively improved the mechanical and tribological properties of Si3N4-based composites. Finally, the Si3N4/Ag composites reinforced by Ag particles showed a friction coefficient of 0.48 +/- 0.01, wear rate of 1.79 x 10(-6) mm(3) N-1 m(-1) and fracture toughness of 7.05 +/- 0.2 MPa m(1/2), respectively.

• 出版日期2018-9
• 单位固体润滑国家重点实验室; 中国科学院大学; 清华大学; 中国科学院兰州化学物理研究所