Accession Number : AD0709204

Title :   STUDY OF ZIRCONIUM DIOXIDE WHITE PIGMENT FOR SPACE ENVIRONMENT.

Descriptive Note : Rept. for Jul 67-Sept 69,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Kan ,H. K. Alan ; Champetier,Robert J. ; Erler,Theodore G.

Report Date : 31 JUL 1970

Pagination or Media Count : 49

Abstract : The properties of zirconium dioxide as a stable white pigment (low alpha/epsilon) for space application are investigated. First, the optical absorption of single crystals is studied, leading to the conclusion that a high degree of purity, except for hafnium, is essential for stable white pigment applications. A subsequent pigment preparation study and irradiation experiments with UV and 3-keV protons are described. The ZrO coatings initially have alpha < 0.11 and epsilon = 0.9. Overall radiation stability (UV and proton) is shown to be binder-dependent, with potassium silicate more stable than silicones. Potassium silicate coatings show Delta alpha = 0.06 after 2400 UV equivalent solar hours, and Delta alpha = 0.01 after irradiation with 3-keV H(+) and H2(+) to a fluence of 10 to the 16th particles/sq cm. (Author)

Descriptors :   (*ZIRCONIUM OXIDES, PIGMENTS), (*SPACE ENVIRONMENTS, *PIGMENTS), PROTON BOMBARDMENT, DEGRADATION, COATINGS, BINDERS, SILICATES, SILICONES, ULTRAVIOLET RADIATION

Subject Categories : Coatings, Colorants and Finishes

Distribution Statement : APPROVED FOR PUBLIC RELEASE