Compound polishing powder for polishing optical elements, preparation method and polishing technology

Abstract

The invention provides a compound polishing powder of a polishing optical element, a preparation method and a polishing process, belonging to expendable material used for polishing the optical element, the preparation method and the polishing process of the polishing powder; wherein, the polishing powder comprises 0.5-3 of Cr2O3 powder and 1 of Al2O3 according to the weight proportion; the granularity of the Cr2O3 powder is ranging from 0.05 microns to 0.10 microns and the granularity of the Al2O3 powder is ranging from 0.05 microns and 0.10 microns; the polishing process comprises the steps as follows: 1) installing polishing formworks for the optical element; 2) filling the polishing powder; 3) arranging a lens disc; 4) fixing the lens disc; 5) rubbing and polishing. The polishing formwork comprises 500 of polishing asphalt and 20-200 of Al2O3 according to the weight parts; in the polishing process, the polishing powder and the polishing formwork can be used for polishing the optical element which is made of zinc selenide, with the surface smoothness of more than 20-10.

Description

technical field [0001] The invention belongs to a consumable material for polishing an optical element, a preparation method, and a polishing process using the polishing powder, especially a polishing mold also involved in the polishing process. Background technique [0002] Zinc selenide precision optical components are precision optical components used in the field of infrared materials. Such precision optical components are especially suitable for cutting-edge technology (such as night vision, homing, navigation, etc.), defense fields (weapons, national security systems, etc.) etc.), laser field (high-power laser, etc.), etc. [0003] In the polishing process of zinc selenide precision optical components, polishing powder should be added. Now people use aluminum oxide powder or other powder such as iron oxide or chromium oxide, that is, a single abrasive is used. The polishing powder is used for polishing, and the applicant cannot achieve an excellent polishing effect on...

AI Technical Summary

Problems solved by technology

The hardness of the polishing asphalt directly determines the hardness of the polishing mold. The polishing mold made of high-hardness polishing asphalt has a higher hardness, which can effectively ensure the smooth surface shape of the optical processing of ZnSe; however, due to the soft material of ZnSe, If an asphalt polishing mold with a hardness that does not match it is used, a large number of polishing scratches will be generated on the surface of ZnSe optical components, which will seriously affect the processing quality of ZnSe optical components such as smoothness.

Therefore, the prior art uses asphalt polishing molds to polish zinc selenide optical components, which has technical defects.

In addition, the bonding agent of the polishing mold used for polishing glass is polyurethane. Polyurethane is added with solid abrasive powder (usually cerium oxide, zirconia) to make composite polishing mold material, but the composite polishing mold material of polyurethane with solid abrasive powder is only suitable. For high-speed polishing of high-hardness materials such as glass

In order to obtain high-precision optical components for soft zinc selenide, the polishing mold made of polyurethane and solid abrasive powder composite polishing mold material cannot meet the high-precision requirements