Surface roughness and fracture cracks of Al2O3/TiO2 composite coating by wet chemical mechanical grinding with structured abrasives pad

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-13 DOI:10.1016/j.jmrt.2024.09.058
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Abstract

In the fields of wind power, and other industries, the Al2O3/TiO2 coating is prepared and ground on the bearing ring, in order to obtain the insulation resisting the electrical erosion for the motors at high voltage. A novel wet chemical mechanical grinding (WCMG) method is proposed to finish this hard-brittle composite material, utilizing the structured diamond abrasives pad and the NaOH solution. The softened workpiece's surface under the chemical reaction was demonstrated by means of Raman spectrum, indentation and scratching tests. The analytical model of surface roughness and fracture cracks is established based on the synthesis of geometry and kinematics, contact mechanics, material removal and indentation fracture mechanics. The surface roughness of coating was reduced from initial Sa 3.293 μm down to final Sa 0.049 μm in the WCMG process with grain size 3 μm and pH 12.01, mostly attributed to the ductile removal of chemically softened coating surface.

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结构磨料垫湿化学机械研磨 Al2O3/TiO2 复合涂层的表面粗糙度和断裂裂纹
在风力发电和其他工业领域,为了获得耐高压电机电侵蚀的绝缘材料,需要在轴承套圈上制备和研磨 Al2O3/TiO2 涂层。本文提出了一种新型湿化学机械研磨(WCMG)方法,利用结构化金刚石研磨垫和 NaOH 溶液来完成这种硬脆复合材料的研磨。通过拉曼光谱、压痕和划痕试验证明了化学反应下软化的工件表面。在综合几何与运动学、接触力学、材料去除和压痕断裂力学的基础上,建立了表面粗糙度和断裂裂纹的分析模型。在晶粒尺寸为 3 μm、pH 值为 12.01 的 WCMG 工艺中,涂层表面粗糙度从初始 Sa 3.293 μm 降至最终 Sa 0.049 μm,这主要归因于化学软化涂层表面的韧性去除。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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