EDM of Insulating Ceramics by Electrical Conductive Surface Layer Control

Gotoh, Hiromitsu; Tani, Takayuki; Mohri, Naotake

doi:10.1016/j.procir.2016.02.271

Cited by 31 publications

(12 citation statements)

References 3 publications

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“…The analysis of the leading world scientific competitors in this domain shows that the world community is separated as it was mentioned above. One group of scientists is focused on the modification of nanoceramics with conductive inclusions to create systems such as ZrO 2 -Ta, ZrO 2 -TiC, ZrO 2 -TiCN, Si 3 N 4 -TiC, Si 3 N 4 -TiCN, Al 2 O 3 -TiC, Al 2 O 3 -TiCN [49][50][51][52][53][54][55][56][57][58][59], as well as inclusions based on graphene and oxide graphene and graphene nanotubes [23,[60][61][62][63][64]. Another group of scientists has focused their research on the processing capabilities of existed ceramics and non-conductive ceramic composites.…”

Section: The Main Scientific Competitorsmentioning

confidence: 99%

On Electrical Discharge Machining of Non-Conductive Ceramics: A Review

et al. 2019

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The inability of ceramic and nanoceramic processing without expensive diamond tools and with a high-material-removal rate hampers the scope of its potential applications and does not allow humanity to make a full shift to the sixth technological paradigm associated with Kuhn scientific revolutions and Kondratieff's waves and restrains the growth of the economy. The authors completed a review on the research state of ceramic and nanoceramic processing by electrical discharge machining, which is possibly solved by two principal approaches associated with the usage of standard commercially available machine tools. The first approach is related to the introduction of expensive secondary phase; the second approach proposes initiate processing by adding auxiliary electrodes in the form of coating, suspension, aerosol, or 3D-printed layer based on the components of silver, copper, or graphite in combination with an improved dielectric oil environment by introducing graphite or carbon nanoparticles, which is hugely relevant today.Technologies 2019, 7, 55 2 of 16 of cutting tools limits the resulting geometry of the product. Other machining methods such as vibroacoustic machining, laser and electron beam scribing, selective laser sintering with a binder, find their specific place in the processing of ceramics. However, they do not allow the receiving of all geometrically possible shapes of the product without losses on the operational parameters of ceramics [16][17][18].One of the most popular methods for the production of parts, regardless of their hardness, is electrical discharge machining (EDM). However, it requires the material to be conductive [19][20][21]. The process of electrical erosion of the material consists of initiating electric pulses in the interelectrode gap, in the breakdown of the dielectric medium in the gap, in establishing a discharge channel, where the temperature reaches more than 10,000 • C (low-temperature plasma). Due to such temperatures, the material is ablated, the drops of cooled material as eroded debris are washed away by the flow of the dielectric medium, and the electrodes again approach to resume the cycle. Thus, a unique crater-like topology on the surface of the workpiece is created [22][23][24][25].The inability of ceramics and nanoceramics to conduct current hampers the scope of its potential applications and restrains the growth of the progress and the switch to the next technological paradigm that most of the scientists associate with the term "nano" [26][27][28][29][30][31][32].Thus, it can be concluded that the study and development of a method for electrical discharge machining of non-conductive ceramics and nanoceramics are incredibly relevant today.The authors propose to apply the dialectical approach of cognition as a scientific approach to solve the formulated scientific problem. The dialectical approach includes the systematization and updating of existing knowledge and new data about the object of research.

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Section: The Main Scientific Competitorsmentioning

confidence: 99%

On Electrical Discharge Machining of Non-Conductive Ceramics: A Review

et al. 2019

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“…Hence, there is also a need to develop a control algorithm for the pulse generator that would precisely control pulse duration. This parameter significantly affects the intrinsic conductive layer, which is important in machining non-conductive ceramics [53]. The growth of the intrinsic conductive layer with the increase of pulse duration can be modeled, which would provide proper explanations behind the mechanism of growth of the conductive layer, and if any other external factors/parameters play a role in the process.…”

Section: Current Challenges and Future Research Directionmentioning

confidence: 99%

“…( a ) Die for fly-eye lens machined by EDM in Si 3 N 4 ceramics. (Reproduced with permission from [53]) ( b ) small product on Silicon nitride using Wire EDM. (Reproduced with permission from [54]).…”

Section: Figurementioning

confidence: 99%

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Electro-Discharge Machining of Ceramics: A Review

et al. 2018

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Conventional machining techniques of ceramics such as milling, drilling, and turning experience high cutting forces as well as extensive tool wear. Nevertheless, non-contact processes such as laser machining and electro-discharge machining (EDM) remain suitable options for machining ceramics materials, which are considered as extremely brittle and hard-to-machine. Considering the importance of ceramic machining, this paper attempts to provide an insight into the state of the art of the EDM process, types of ceramics materials and their applications, as well as the machining techniques involved. This study also presents a concise literature review of experimental and theoretical research studies conducted on the EDM of ceramics. Finally, a section summarizing the major challenges, proposed solutions, and suggestions for future research directions has been included at the end of the paper.

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“…EDM is used in a wide range of industries, from automotive, aerospace to biomedical [4, 5] and there are many commercial EDMs available in the market. EDM is also being explored as a tool for machining materials with low electrical conductivity such as semiconductors [6, 7] or ceramics [8]. However, the systematic study of EPGs from the power electronics (PEs) perspective is found in very few articles [9, 10].…”

Section: Introductionmentioning

confidence: 99%