Accession Number : AD0600995

Title :   WETTING AND ADHERENCE OF NI/NI-ALLOYS TO SAPPHIRE.

Descriptive Note : Technical Information Series.

Corporate Author : GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV

Personal Author(s) : Sutton,W. H.

Report Date : JUN 1964

Pagination or Media Count : 40

Abstract : The effects on various additives to nickel on its wetting and adherence to sapphire were investigated by preparing special binary alloys containing one atomic percent of Al, Cu, In, Ti, Zr, and Cr. Sessile drop experiments were conducted in vacuo at 148 C to 1500 C in order to observe the contact angles and the degree of wetting. Only the nickel drops containing Ti, Zr, and Cr showed evidence of pronounced chemical reaction with the sapphire substrates. These same compositions had contact angles significantly lower than the pure nickel. Shear tests were conducted on solidified sessile drops of nickel containing higher percentages of Ti and Cr, and shear stresses as high as 25,000 psi were recorded. The results of these tests are discussed along with the factors which were found to effect both the wetting and the adherence between the metallic and oxide phases. (Author)

Descriptors :   (*NICKEL ALLOYS, SURFACE ACTIVE SUBSTANCES), (*SAPPHIRE, HIGH TEMPERATURE), CHEMICAL REACTIONS, TITANIUM ALLOYS, ZIRCONIUM ALLOYS, CHROMIUM ALLOYS, ALUMINUM ALLOYS, COPPER ALLOYS, ADHESION, OXIDES, PHASE STUDIES, COMPOSITE MATERIALS, INDIUM ALLOYS, ADDITIVES

Distribution Statement : APPROVED FOR PUBLIC RELEASE