The machining of conductive alumina ceramic was successful by the electric discharge grinding (EDG). Therefore, the aim of the present work is to increase the material removal rate (MRR) during EDG of conductive alumina ceramic by addition of ceramic powder with dielectric. To achieve the objective through experimental investigation is carried out and the influence of input process parameters (powder concentration, duty ratio, pulse on time, table speed and wheel speed) on surface roughness (SR), MRR and surface integrity has been studied. The fine grade silicon carbide powder of #1000 mesh sizes was mixed in dielectric medium with varying concentration to understand the influence of the powder concentration and its interaction with other process parameters during powder mixed electric discharge grinding (PMEDG). The central composite rotatable design (CCRD) has been used to plan the experiments. Optimization of the obtained statistical models of MRR and SR has been done to obtain highest MRR and lowest SR. It was observed that the MRR achieved by PMEDG was 3 – 10 times higher than EDG. It was found that all the process factors and interactions show significant contribution on SR. The SR obtained by PMEDG was 2 – 4 times higher than EDG. It has been established that the PMEDG process is a better option for processing of Al2O3–SiCw–TiC ceramic material as preliminary operation before EDG to achieve high MRR. In the present work the surface and subsurface damages were also assessed and characterized by the scanning electron microscope (SEM).

中文翻译：

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粉末混合放电磨削Al ₂ O ₃ -SiC _w -TiC陶瓷复合材料的研究。

通过放电研磨（EDG）成功加工了导电氧化铝陶瓷。因此，本发明的目的是通过添加具有电介质的陶瓷粉末来提高导电性氧化铝陶瓷的EDG期间的材料去除率（MRR）。为了通过实验研究达到该目的，研究了输入工艺参数（粉末浓度，占空比，脉冲时间，工作台速度和砂轮速度）对表面粗糙度（SR），MRR和表面完整性的影响。将＃1000目尺寸的细级碳化硅粉末与不同浓度的电介质混合，以了解粉末混合放电研磨（PMEDG）过程中粉末浓度的影响及其与其他工艺参数的相互作用。中央复合可旋转设计（CCRD）已用于计划实验。已完成对获得的MRR和SR统计模型的优化，以获得最高MRR和最低SR。据观察，PMEDG实现的MRR是EDG的3 – 10倍。结果发现，所有过程因素和相互作用都对SR有重要贡献。PMEDG获得的SR是EDG的2-4倍。已经确定，在EDG之前进行初步操作以实现高MRR的过程中，PMEDG工艺是处理Al2O3–SiCw–TiC陶瓷材料的更好选择。在本工作中，还通过扫描电子显微镜（SEM）对表面和表面下的损伤进行了评估和表征。已完成对获得的MRR和SR统计模型的优化，以获得最高MRR和最低SR。据观察，PMEDG实现的MRR是EDG的3 – 10倍。结果发现，所有过程因素和相互作用都对SR有重要贡献。PMEDG获得的SR是EDG的2-4倍。已经确定，在EDG之前进行初步操作以实现高MRR的过程中，PMEDG工艺是处理Al2O3–SiCw–TiC陶瓷材料的更好选择。在本工作中，还通过扫描电子显微镜（SEM）对表面和表面下的损伤进行了评估和表征。已完成对获得的MRR和SR统计模型的优化，以获得最高MRR和最低SR。据观察，PMEDG实现的MRR是EDG的3 – 10倍。结果发现，所有过程因素和相互作用都对SR有重要贡献。PMEDG获得的SR是EDG的2-4倍。已经确定，在EDG之前进行初步操作以实现高MRR的过程中，PMEDG工艺是处理Al2O3–SiCw–TiC陶瓷材料的更好选择。在本工作中，还通过扫描电子显微镜（SEM）对表面和表面下的损伤进行了评估和表征。结果发现，所有过程因素和相互作用都对SR有重要贡献。PMEDG获得的SR是EDG的2-4倍。已经确定，在EDG之前进行初步操作以实现高MRR的过程中，PMEDG工艺是处理Al2O3–SiCw–TiC陶瓷材料的更好选择。在本工作中，还通过扫描电子显微镜（SEM）对表面和表面下的损伤进行了评估和表征。结果发现，所有过程因素和相互作用都对SR有重要贡献。PMEDG获得的SR是EDG的2-4倍。已经确定，在EDG之前进行初步操作以实现高MRR的过程中，PMEDG工艺是处理Al2O3-SiCw-TiC陶瓷材料的更好选择。在本工作中，还通过扫描电子显微镜（SEM）对表面和表面下的损伤进行了评估和表征。