Investigation and Fabrication of Cadmium Sulfide Infrared Windows.
Abstract
Cadmium sulfide powders prepared by a variety of wet chemical reactions were evaluated for infrared optical quality. Reaction variables, such as the pH and dilution of solutions, reaction temperature, and digestion of the precipitate were investigated. Post-treatments of the precipitated powders, including washing and drying methods, and H2S-firing were studied. Precipitation from cadmium sulfate was adopted as the preferred route for preparing large batches of infrared optical quality cadmium sulfide. Twenty five pound lots of powder were prepared in pilot plant equipment with consistent infrared quality from lot to lot. Rectangular windows 6-inches x 12-inches x 1/4-inch were fabricated by open die-hot pressing. Peak infrared transmittances of 61 percent were attained, but the full potential of the cadmium sulfide powder was not realized due to the pressure limitation of available pressing equipment. The feasibility of joining segments of hot-pressed cadmium sulfide to form large infrared windows was investigated. Epotek, and epoxy adhesive, was the most promising of the bonding agents studied. Physical and optical properties of open die hot-pressed cadmium sulfide were measured. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1970
- Accession Number
- AD0866585
Entities
People
- Leroy S. Ladd
- Richard E. Clark