EXPERIMENTAL STUDY OF FACTORS CONTROLLING THE EFFECTIVENESS OF HIGH- TEMPERATURE PROTECTIVE COATINGS FOR TUNGSTEN
Quarterly progress rept. no. 2, 15 Aug-15 Nov 1962
GENERAL TELEPHONE AND ELECTRONICS LABS INC BAYSIDE NY BAYSIDE LAB
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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 films. Experiments involving oxidation kinetics and the microstructural and quantitative identification of the layers formed have been conducted on four systems. An analysis of the diffusion processes governing growth in the Zr-Th- O system is pre sented, and a preliminary discussion of the re sults obtained in the W-Hf-O, ZrN-ThN-O and Sn Al-Cr systems is given.
- Metallurgy and Metallography