Accession Number:

AD0419280

Title:

EXPERIMENTAL STUDY OF FACTORS CONTROLLING THE EFFECTIVENESS OF HIGH-TEMPERATURE PROTECTIVE COATINGS FOR TUNGSTEN.

Descriptive Note:

Quarterly progress rept. no. 3, 15 Nov 62 15 Feb 63,

Corporate Author:

GENERAL TELEPHONE AND ELECTRONICS LABS INC BAYSIDE N Y

Personal Author(s):

Report Date:

1963-03-15

Pagination or Media Count:

1.0

Abstract:

Two processes governing the efficacy of high temperature protective coatings for tungsten, interdiffusion in ternary oxygen-metal-metal systems and breakaway during oxide film growth, are being investigated experimentally to deter mine the oxidation behavior of binary alloys and the influence of substrate mechanical properties on the growth characteristics of the oxide films. Experiments on oxidation kinetics and the micro structal and quantitative identification of the layers formed have been conducted on seven sys tems. Experiments on the effect of nitrogen on the diffusion processes that govern the growth of oxides in the Zr-Th-O system are described. The results obtained in the W-Hf-O, W-Hf-Re-O, Zr-N-O and ZrN-ThN-O systems and the Sn-Al-Cr and Sn-Al-La systems are given. Pre liminary experiments on the Zr-Y-O and Hf-Y-O systems are described. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE