Advances in Electrical Discharge Machining of Insulating Ceramics

Abstract

There are two main ways of carrying out the electrical discharge machining of the insulating ceramics: changing the electrical and chemical properties of ceramics due to additives in producing composites/nanocomposites and changing the electrical and chemical properties in the interelectrode gap. This review summarizes and analyzes the current data on the machinability in water suspension and hydrocarbons depending on the electrical properties of the ceramic composites and assisting means such as coating and powder. There are provided the existing approaches and original methods for solving the global problem of the electrical discharge machining of insulating ceramics, suggesting further development of the existing methods since, up to now, the experimental research is non-systemic. The dependencies of the machinability on the electrical properties of conductive ceramic composites, the specific electrical resistance of the assisting coating, and the assisting powder’s band gap and concentration for machining insulating ceramics are revealed. The higher the electrical conductivity, the higher the machinability of ceramic composites, and the lower the band gap, the higher the machinability for insulating ceramics. Two technological gaps were revealed in the powder’s concentration that can be a particular case of logarithmic decrement of attenuation. The proposed approach suggests using assisting powder with the lower band gap.

Investigation into Optimizing of Machining Parameters using RSM for Si3N4 -TiN Ceramic C omposites by WEDM

“…As a result, complex shapes cannot be machined in them using traditional machining techniques (1) . The great majority of ceramic matrix composite materials are typically non-conductive, due to their electrical conductivity, Silicon Nitride-Titanium Nitride ceramic composite can be machined using an Electro Discharge Machine, which can produce surfaces that are resistant to both corrosion and biological degradation (2) . Si 3 N 4 -TiN ceramic composites are commonly used in fabrication of power generation components, modern gas burners, diesel engine glow plugs, bio medical implants, gas turbine for aerospace applications due to its maximum strength, maximum hardness, high creep resistance, and low temperature malleability (3) .…”

Dental Implants: Modern Materials and Methods of Their Surface Modification

“…The wide implementation of ceramic implants is hindered by the relatively low machinability of ZrO 2 [217,218], increased brittleness of ceramics [219,220], low thermal conductivity and sensitivity to thermal shock [206,[221][222][223][224][225], and CAD/CAM technologies of mechanical processing of products, which have led to the increase in the volume of studies, the object of which are implants from ceramic materials (for the last 20 years, the number of publications with studies on zirconium implant properties has increased 2.5 times; see Figure 6), with the market for dental implants made of zirconium dioxide increasing by more than 12% per year [226].…”