Abstract
In this paper, the surface characteristics of TiN/Si3N4 nano-complex ceramics cut with wire electro-discharge machining are studied. The effect of single pulse energy on surface properties is investigated in detail. The microscopic observation of the surface appearance with the scanning electron microscope shows that the longer the pulse discharge time, the greater the pulse discharge current, the greater the single pulse energy, the deeper the surface discharge pit, the larger the size, the surface melting and re-solidification phenomenon is more serious. The micro-observation of the cross-section of the surface processed shows that the surface metamorphic layer includes the melting and re-freezing layer and the white layer, the thickness of surface metamorphic layer is about 1 to 10 μm. The longer the pulse discharge time, the greater the single pulse energy, the greater the thickness of the surface metamorphosis layer. Due to the randomness of the discharge process, the metamorphic layer is not uniform.
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