Casting of halide and fluoride alloys for laser windows. Final report

Technical Report · Sun Feb 15 04:00:00 EST 1976

OSTI ID:7342994

Newberg, R T; Pappis, J

The problem of residual strain in castings of alkali halides (KCl and SrCl/sub 2/-doped KCl) and alkaline earth fluorides (CaF/sub 2/ and SrF/sub 2/) has been overcome by the development of proper annealing and slow cooling procedures. Semiquantitative analysis of absorption coefficients and scattering centers (produced during improper casting and annealing procedures) has shown a correlation between the two for both the halides at 10 micrometers and fluorides at 5.25 micrometers. Consistently high quality castings of both CaF/sub 2/ and SrF/sub 2/ have been fabricated regardless of the starting materials. The dependence of fracture strength on both surface polish and annealing history is evidence that fracture for the fluorides is determined by surface and/or edge flaws. (GRA)

• Research Organization: Raytheon Co., Waltham, Mass. (USA). Research Div.
• OSTI ID: 7342994
• Report Number(s): AD-A-023460; S-1963
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CASTING
CHLORIDES
CHLORINE COMPOUNDS
FABRICATION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
LASER MATERIALS
LASERS
OPENINGS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
STRAINS
STRONTIUM COMPOUNDS
STRONTIUM FLUORIDES
WINDOWS