Material removal behavior in scratching of zirconia ceramic surface treated with laser thermal shock
Material removal behavior in scratching of zirconia ceramic surface treated with laser thermal shock
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DOI：
10.1007/s00170-015-8098-7
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发表时间：
2015-11
期刊：
影响因子：
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通讯作者：
Sheng Xu;Z. Yao;M. Zhang
中科院分区：
文献类型：
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作者：
Sheng Xu;Z. Yao;M. Zhang
激光热冲击辅助磨削是一种新型的陶瓷加工技术。然而，lts辅助磨削中材料的去除机理尚未得到广泛的研究，阻碍了其潜力的充分发挥。本文通过对钇稳定四方氧化锆多晶（Y-TZP）在lts辅助磨削过程中材料去除行为的研究，探讨了lts辅助磨削过程中的材料去除机理。为了揭示有LTS和没有LTS的Y-TZP试样表面的不同材料去除行为，从陶瓷表面硬度、划痕力比（SFR）和划痕形貌等方面研究并比较了划痕特征。与未进行LTS处理的表面相比，经过LTS处理的表面沟槽更深，SFR更大，表面硬度降低。这些结果表明，在LTS的辅助下，Y-TZP的可磨性得到了显著提高。进一步证明，使用LTS处理后，表面划痕处出现了明显的晶粒剥落痕迹，材料去除率增大。这些结果表明，在表面进行LTS处理后，刀具的切削效率得到了提高。此外，在LTS辅助下，表面的塑性脊和晶粒剥落痕迹表明存在韧性-脆性混合模式。这对陶瓷磨削具有重要的意义和益处，因为它提高了表面完整性和材料去除率。
Laser thermal shock (LTS)-assisted grinding is a novel technology for processing ceramics. However, the material removal mechanism in LTS-assisted grinding has not been studied extensively, hindering the sufficient development of its potential. This paper focuses on the material removal mechanism in LTS-assisted grinding by investigating the material removal behavior in LTS-assisted scratching of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP). In order to reveal the different material removal behaviors between the Y-TZP specimen surfaces with and without LTS, the scratch characteristics were investigated and compared in terms of hardness of the ceramic surface, scratching force ratio (SFR), and scratch morphology. Compared with the surface without LTS, the grooves on the surface with LTS were deeper, the SFR was larger, and the hardness of surface decreased. These results indicate that the grindability of Y-TZP significantly improved from the assistance of the LTS. As further evidence, prominent marks of grain spalling were found in the scratch grooves on the surface with LTS and the material removal volume increased. These results indicate that the cutting efficiency of the tool improved after the surface was treated with LTS. Furthermore, the plastic ridges and marks of grain spalling on the surface assisted with LTS indicate the existence of ductile-brittle mixed mode. This is significant and beneficial for ceramics grinding due to its improved surface integrity and large material removal rate.