Near-net-shape processed ZnS ceramics by aqueous casting and pressureless sintering

Abstract In this paper, slip casted ZnS ceramics were pressurelessly sintered at 1000 °C under flowing argon atmosphere. The application of cold isostatic pressing enhanced the microstructural homogeneity of the ZnS green body and therefore contributed to the overall densification progress. Highest relative density of 92% was achieved after sintering for 6 h, accompanied by remarkable grain growth. Phase transition from sphalerite to wurtzite was found by the prolonged soaking time. The mechanisms for grain growth were analyzed.