Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 15, Pages 21648-21655Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.04.142
Keywords
Strain rate; Impact effect; Zirconia ceramics; Grinding damage; Subsurface crack
Categories
Funding
- National Natural Science Foundation of China [51505144]
- Natural Science Foundation of Hunan Province [2020JJ5178, 2020JJ4024]
- Scientific Research Fund of Hunan Provincial Education Department [20A202]
- Open Foundation for Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material [E21849]
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This study investigates the effects of strain rate on the grinding damage of zirconia ceramics. Experimental results show that increasing the strain rate can significantly reduce the grinding force, improve the surface smoothness, and decrease the length of subsurface cracks. The direction of subsurface cracks is related to the internal defects of the material.
To study the mechanism of strain rate on the grinding damage of zirconia ceramics (ZrO2), a ZrO2 surface grinding experiment was conducted to analyse the effect of strain rate on the grinding force, surface morphology and subsurface cracks. As the strain rate increased, the grinding force decreased significantly; the grinding scratches gradually became continuous and clear, and the grinding surface gradually became smooth. Increasing the strain rate can greatly reduce the length of subsurface cracks; however, the length of subsurface cracks drops slowly and tends to stabilise when the strain rate reaches a certain value. The direction of subsurface cracks is related to the internal defects of the material, and there is a trend of approaching the surrounding cracks and defects. When the internal defects were stimulated by the impact stress wave, the cracks started to grow and expand from the tip, and the expanding direction remained at approximately 125 in the direction of the defect length. The results show that an increase in the grinding strain rate can effectively improve the grinding quality of zirconia ceramics, which has guiding significance for practical production.
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