Tribological characteristics of self-mated couples of Si3N4-SiC composites in the range 22-700°C

被引:32
作者
Gomes, JR [1 ]
Osendi, MI
Miranzo, P
Oliveira, FJ
Silva, RF
机构
[1] Univ Minho, Dept Mech Engn, P-4810 Guimaraes, Portugal
[2] CSIC, Inst Ceram & Vidrio, Madrid 28500, Spain
[3] Univ Aveiro, UIMC, Dept Ceram & Glass Engn, P-3810 Aveiro, Portugal
关键词
tribological characteristics; Si3N4-SiC composites; self-mated pairs;
D O I
10.1016/S0043-1648(99)00243-4
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The tribological behaviour of self-mated pain of Si3N4, Si3N4/SiCp (platelets) and Si3N4/SiCN (nanosized) hot pressed materials was studied in a pin-on-disc configuration. Tests were performed without lubrication, at a fixed load of 5 N, using different temperatures (room temperature - 700 degrees C) and sliding speeds (0.5-2 m s(-1)). Friction coefficients were usually above 0.5, being almost independent of sliding speed and test temperature. For all test conditions, the Si3N4/SiCp composite had the lowest friction coefficient, due to the presence of SiC platelets with smooth cleavage planes oriented parallel to the sliding surface. Wear coefficients were above 10(-6) mm(3) N-1 m(-1) denoting a generalised severe wear mode, controlled by surface microcracking. No net differences were found between the wear behaviour of monolithic and composite materials under this wear regime. Wear decreased with sliding speed due to the protective action of a coherent tribofilm resulting from debris aggregation. Conversely, wear coefficients, showed a steep increase above room temperature, to values around 10(-4) mm(3) N-1 m(-1) at 700 degrees C. (C) 1999 Elsevier Science S.A. All rights reserved.
引用
收藏
页码:222 / 228
页数:7
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