METHOD FOR PRODUCING OPTICAL POLYCRYSTALLINE ZINC SELENIDE Russian patent published in 2017 - IPC C30B28/12 C30B23/06 C30B29/48 C01B19/04 C23C14/32 C23C14/58 C04B35/547 C04B35/645 B01D29/01 B01D35/02 G02B1/02 G02B3/00 B64D29/00 

FIELD: physics.

SUBSTANCE: method involves growing zinc selenide preforms by evaporating the original powdered or compacted feedstock, condensing the vapors on the heated substrate, for which intermediate vapor condensation is carried out in the container for growing zinc selenide preforms, allowing vapor to pass through the labyrinth formed in the container working space in the form of a plate with projections, whereby the vapor passage to the substrate occurs through the non-linear winding path that facilitates the condensate purification from solid impurities, and further through the carbon graphite filter fixed between graphite rings, followed by re-deposition and transfer of steam to the substrate, wherein the vapor condensation occurrs on the substrate heated to 1030-1070°C, at the rate of 0.2-0.5 mm/h, then the grown zinc selenide preform is cooled and removed from the growth setup, it is placed into the apparatus-gasostat, and hot isostatic pressing is performed at the temperature of 1050-1150°C and the inert gas pressure of 150-200 MPa for 2-3.5 hours.

EFFECT: manufacturing a monolithic preform in the form of a circular plate or a spherical concave segment of polycrystalline zinc selenide having increased chemical purity and optical uniformity of a spectral transmittance over the entire grown preform area, extended spectral transparency range with high transmittance in the visible and infrared spectrum areas in the optical parts, manufactured from these preforms.

3 cl, 3 dwg, 1 tbl, 1 ex