It was investigated that tribological properties of CN
x coating slid against a Si
3N
4 ball in ambient air with 5 different temperatures of CN
x as 23, 75, 100, 125, and 150°C and 4 different humidity conditions as <5, 20-30, 40-50, and 60-70%RH during sliding tests. These friction tests result indicated that friction coefficient was lower than 0.05 when CN
x temperature was higher than 125°C at 60-70%RH, 100°C at 20-50%RH, and 75°C at < 5%RH. The specific wear rate was within a range of 10
-7mm
3/Nm in several humidity conditions. It could be within a range of 10
-8mm
3/Nm when the CN
x temperature was higher than 125°C at 60-70%RH, 100°C at 20-50%RH, and 23°C at <5%RH. It was observed that the CN
x structure and composition of wear tracks were not changed before and after sliding tests with a Raman spectroscopy and an AES. To show a controllability of CN
x coating's friction coefficient against a Si
3N
4 ball with temperature of substrate, we performed friction test between CN
x and a Si
3N
4 ball with rising temperature of CN
x surface from room temperature to 100°C and then cooling to room temperature. Friction coefficient was 0.18 at room temperature, which decreased to 0.01-0.02 at 100°C after rising temperature. After cooling the CN
x substrate to room temperature, friction coefficient returned to 0.18 that was the same as the initial value. These results indicated the friction of CN
x against a Si
3N
4 ball can be controlled with the temperature of CN
x in air.
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