Study on the Material Removal Characteristics of Ultra-high Temperature Ceramic Composites ZrB2-HfB2-SiC Machined by EDM
ZrB2-HfB2-SiC is an ultra-high temperature ceramic composite material,the machining of such composites using traditional machining methods often faces the challenges of high tool wear and low machining efficiencies,attributed to the high hardness and brittleness of this material.EDM is not limited by the hardness and brittleness of materials,providing an effective machining method for ZrB2-HfB2-SiC.However,the material removal process and removal mechanism during EDM of ZrB2-HfB2-SiC are significantly different from those of conventional metals,attributed to the non-homogeneity and anisotropy caused by the different material components within it.The material removal process during the EDM of ZrB2-HfB2-SiC were investigated by using high-speed camera observation to analyze the material removal mechanisms.The results showed that the material had complex physical and chemical changes during the discharge removal process,and the SiC fibers were mainly removed by fracture.The shape of the discharge pit is irregular,and the morphology of the discharge pit at different positions varies widely.The experimental study of EDM micro-hole machining was carried out to verify the feasibility of EDM ZrB2-HfB2-SiC,and it was found that it had obvious polarity effect.
ZrB2-HfB2-SiCultra-high temperature ceramic compositesEDMablation
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