| 摘要: |
| 利用离子注入与沉积工艺在氮化硅陶瓷盘表面制备了厚约500 nm的类金刚石碳膜（DLC膜）。采用有限元模型模拟计算了DLC膜的热应力，分析了不同工作温度下薄膜热应力的大小和分布；利用高温球盘摩擦试验机考察了陶瓷盘表面DLC膜的摩擦磨损特性；将表面沉积DLC膜的氮化硅陶瓷球经历不同温度循环后分别装入满装角接触轴承，测试了轴承的滚动摩擦力矩。试验结果表明：在常温到350 ℃范围内，氮化硅陶瓷表面的DLC膜可降低滑动摩擦因数和轴承的滚动摩擦力矩值，但随着温度的升高，DLC膜的磨损寿命变短。在经历400 ℃热循环后，陶瓷表面DLC膜在热应力和机械力的共同作用下起皱、脱落，配副摩擦恢复到未镀膜水平。 |
| 关键词: 滚动摩擦 高温 DLC膜 陶瓷 |
| DOI： |
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| 基金项目:国家自然科学基金（50875058）；国家“973”计划（2007CB607602） |
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| Friction Characteristics of DLC Films on the Silicon Nitride Ceramic Surfaces at High Temperature Conditions |
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ZHUO Hui–dan， SONG Bao–yu， GU Le
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Department of Mechanical Engineering, Harbin Institute of Technology, Harbin 150001
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| Abstract: |
| Based on the ion plantation and deposition technology, diamond like carbon (DCL) films about 500 nm thicknesses were prepared on the surface of silicon nitride ceramics. The finite element modeling method was used to simulate the thermal stress between DCL film and the ceramic substrate. Their sliding friction properties were investigated on high–temperature ball–on–disk friction tester. Rolling friction torque of full–ball angle contact bearings filled with ceramic balls deposited DLC films and experienced different temperature loops were tested. The results show that the DLC films on silicon nitride surfaces can lower the sliding and rolling friction ranging from room temperature to 350 ℃. The wear duration lives of DLC films get shorter with the rising of temperature. DLC films wrinkle and fall off from the ceramic basis after the temperature circulation to 400 ℃ because of the combined function of the thermal and mechanical stress. Their frictional characteristics return to normal level of uncoated pairs. |
| Key words: rolling friction torque high temperature DLC film ceramics |
