ZrO2-Al2O3LAMINATED CERAMICS AND THEIR TRIBOLOGICAL BEHAVIORS

Zehua Zhou, Peidao Ding, Shouhong Tan and Junsi Lan
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Zehua Zhou: Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China
Peidao Ding: Chongqing University, Chongqing 400044, P. R. China
Shouhong Tan: Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China
Junsi Lan: Southwest Jiaotong University, Chengdu 610031, P. R.China

Surface Review and Letters (SRL), 2005, vol. 12, issue 01, 75-84

Abstract: ZrO2-Al2O3laminated ceramics of 3 layers were prepared by dry-pressing and pressureless sintering, and their mechanical properties and toughening mechanisms were studied. Furthermore, their tribological behaviors and wear mechanisms under dry friction and water lubrication conditions were also investigated, and compared with those of monolayerZrO2-Al2O3ceramics under the same conditions. The results show that the bending strength, fracture toughness and hardness of the laminated ceramics are all better than those of the monolayer ceramics, moreover the friction factor and wear rate of the laminated ceramics are clearly lower than those of the monolayer ceramics. The excellent mechanical properties of the laminated ceramics, especially toughness, result mainly from effects of residual stress in the specially-designed layer, interface structure and phase transformation together. Good tribological properties of the laminated ceramics are supposed due to the high toughness and low shearing stress in the wear surface. The friction and wear of the composites are effectively decreased by water lubrication because of the transformation of the main wear mechanisms from abrasive and adhesive wear under dry friction to tribo-chemical and fatigue wear under water lubrication.

Keywords: 3-layer structure ceramics; residual stress; wear mechanism; dry friction; water lubrication (search for similar items in EconPapers)
Date: 2005
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DOI: 10.1142/S0218625X05006809

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