METHOD TO MANUFACTURE INFRARED TRANSMITTING ZnS NANOPOWDER SINTERED BODY

Disclosed are an infrared transmitting ZnS nano powder sintered body, increasing the ratio of sulfur (S) in hydrothermal synthesis to perform synthesis in a state where the ratio of S is greater than that of zinc (Zn) and prevent ZnO from being formed by oxidation of ZnS while performing vacuum heat treatment so as to remove Na_2SO_4, thereby securing an infrared transmittivity of 69% or more by removal of an absorption peak due to Na_2SO_4, and a manufacturing method thereof. According to the present invention, the method comprises: (a) a step of mixing ZnSO_4·7H_2O and Na_2S·9H_2O in a solvent by a weight ratio of 1:1 to 1:1.3 to perform hydrothermal synthesis; (b) a step of filtrating a reaction product of the hydrothermal synthesis and then performing vacuum heat treatment to acquire ZnS nanopowder; and (c) a step of sintering the acquired ZnS nanopowder at 800 to 1,050°C to form the nanopowder sintered body. COPYRIGHT KIPO 2018 ...