This paper discusses the grinding performance of ZnS. It's the base for ultra-precision grinding to master the mechanical properties and removal mechanism of ZnS which is an infrared material. This study determined the hardness,fracture toughness and critical grinding depth by micro-indentation test; Based on the result of nano-indentation test, constitutive model of ZnS was established and simulation of indentation and scratch were completed. Grinding removal mechanism and effect of process parameters on scratch result were explored by scratch test. It was found that test was consistent with simulation.
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