Powder mixed-electro discharge machining (PM-EDM) is recently evolving machining technique which can simultaneously remove and modify the machined surface through thermo-electrical process. It is a modified form of EDM in which the conductive powder elements are added in the dielectric liquid to enhance machined surface characteristics and machining responses. The commonly used biomaterials such as 316L stainless steel, Ti-based alloy, Ni–Ti, Mg alloy, and Co–Mo–Cr alloy have excellent mechanical characteristics while the biofunction of these materials are not in satisfactory level. Due to higher hardness, brittleness, and heat resistant natures of the biomaterials, it is very challenging to machine them with conventional machining. Both the system efficiency and modified surface properties depend on the associated electrical and non-electrical factors of PM-EDM cycle. This review focuses on the influence of process factors such as current, pulse duration, tool-polarity, duty cycle, potential voltage, types of liquid, and added powder concentration on performance outputs including material removal and tool wear rate, coating thickness, coarseness, microhardness, coating adhesion bonding, biocompatibility, and resistant to corrosion. This study also discusses influence of various powders on machining and modified surface characteristics of biomaterials. The future research scopes and challenges of PM-EDM process are included in this study thoroughly.

粉末混合放电加工（PM-EDM）是近来发展起来的加工技术，它可以通过热电工艺同时去除和修饰加工的表面。它是EDM的一种改进形式，其中将导电粉末元素添加到介电液体中，以增强加工后的表面特性和加工响应。常用的生物材料，例如316L不锈钢，Ti基合金，Ni-Ti，Mg合金和Co-Mo-Cr合金具有出色的机械性能，而这些材料的生物功能却不令人满意。由于生物材料具有更高的硬度，脆性和耐热性，因此采用常规加工方法对其进行加工非常具有挑战性。系统效率和改进的表面性能都取决于PM-EDM循环的相关电气和非电气因素。这篇综述重点关注工艺因素的影响，例如电流，脉冲持续时间，工具极性，占空比，电位电压，液体类型以及添加的粉末浓度对性能输出的影响，包括材料去除和工具磨损率，涂层厚度，粗糙度，显微硬度，涂层粘合力，生物相容性和耐腐蚀性能。这项研究还讨论了各种粉末对生物材料加工和改性表面特性的影响。PM-EDM工艺的未来研究范围和挑战已包含在本研究中。占空比，电位电压，液体类型以及添加的粉末浓度等性能输出，包括材料去除和工具磨损率，涂层厚度，粗糙度，显微硬度，涂层粘合力，生物相容性和耐腐蚀性。这项研究还讨论了各种粉末对生物材料加工和改性表面特性的影响。PM-EDM工艺的未来研究范围和挑战已包含在本研究中。占空比，电位电压，液体类型以及添加的粉末浓度等性能输出，包括材料去除和工具磨损率，涂层厚度，粗糙度，显微硬度，涂层粘合力，生物相容性和耐腐蚀性。这项研究还讨论了各种粉末对生物材料加工和改性表面特性的影响。PM-EDM工艺的未来研究范围和挑战已包含在本研究中。这项研究还讨论了各种粉末对生物材料加工和改性表面特性的影响。PM-EDM工艺的未来研究范围和挑战已包含在本研究中。这项研究还讨论了各种粉末对生物材料加工和改性表面特性的影响。PM-EDM工艺的未来研究范围和挑战已包含在本研究中。