Abstract
Fracture behaviour of zinc sulphide ceramics prepared by chemical vapour deposition (CVD) followed by hot isostatic pressing (CVD + HIP) was investigated in terms of flexural strength ( σ f), plane-strain fracture toughness ( K Ic), even conditional fracture toughness ( K IQ), R-curve behaviour (variation of total fracture energy release rate, J c with crack extension, δ/ δ c) and fracture mode. The corresponding Knoop Hardness number (KHN) and its correlations to flexural strength ( σ f) are also evaluated and reported. The present study showed that the zinc sulphide (ZnS) ceramics processed by CVD exhibited higher fracture resistance compared to ZnS processed by CVD + HIP condition. This observation is principally attributed to higher grain size associated with post-CVD HIPing process. In both conditions, the ZnS materials exhibited conditional fracture toughness ( K IQ) that decreased moderately with increased crack length due to the change in fracture mode form grossly tensile to predominant shear. A constantly rising R-curve behaviour was indicated in both the materials with significant increase in total fracture energy release rate ( J c with the normalised displacement ( δ/ δ c), a parameter representing crack extension.
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