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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

氧化铝陶瓷的高温磨损与自润滑机理研究

肖汉宁; 千田哲也+; 殷冀湘   

  1. 湖南大学材料科学与应用化学研究所; 长沙410082; +船舶技术研究所东京都三鹰市181,日本
  • 收稿日期:1996-04-08 修回日期:1996-05-06 出版日期:1997-06-20 网络出版日期:1997-06-20

Sliding Wear and Self Lubrication Mechanism of Alumina Ceramics at High-Temperatures

XIAO Hanning; SENDA Tetsuya+; YIN Jixiang   

  1. Institute of Material Science Applied Chemistry; Henal University Chanysha 410082 China; +Shipt Research Institute; Mitaka; Tokyo 181; Japan
  • Received:1996-04-08 Revised:1996-05-06 Published:1997-06-20 Online:1997-06-20

PDF (PC)

877

被引次数

53

摘要： 研究了Al203陶瓷从室温至12000℃在于摩擦条件下的高温摩擦磨损行为。结果表明：在600℃以后的摩擦磨损随温度上升而逐渐减小，在1200℃的摩擦系数仅为室温的60％磨损则降低了两个数量级，表现出良好的高温自润滑特征。在不同温度下，存在三种显著不同的磨损机理．从室温至600℃，主要是磨粒磨损和微断裂，磨损随温度上升而略有增加．在600～1000℃，磨损机理逐渐由脆性断裂过渡到塑性变形和再结晶，在表面形成一个厚度为5～10μm的、类似于纳米材料结构的特殊表面层．随着这种特殊表面层的形成，磨损显著下降．在1200℃，摩擦表面由塑性变形发展到软化状态，出现流体动力润滑，使摩擦磨损进一步降低．

关键词: 化铝陶瓷, 摩擦, 磨损, 塑性变形, 自润滑, 高温

Abstract: Friction and wear of alumina ceramics were conducted in dry sliding from room temperatureto 1200℃. Both friction and wear decreased obviously over 600℃. The friction coefficient at1200℃ was only 60% as that at room temperature. The specific wear rate at 1200℃ decreasedtwo orders of magnitude than that at 600℃, down to 5×10-16m3/(N.m). There are three modelsof wear mechanism in the temperature range. Before 600℃, abrasive wear and development ofmicrocracks are the dominating mechanism. Between 600℃ and 1000℃, a amooth surface layer with very fine grains, similar to the structure of nano-ceramics, was formed. Plastic deformation and recrystallization controls the friction and wear. At 1200℃, a glassy film occurred on the surface by the severe plastic deformation, which makes the friction be in hydro-dynamic lubrication.

Key words: alumina ceramics, friction, wear, plastic deformation, self-lubrication, high temperature