ADVANCED DEVELOPMENT OF PFR-6
Abstract
The PFR-6 alloy silicide coating, initially developed in the laboratory to protect molybdenum alloys against high-temperature oxidation, was scaled up and optimized for use at an intermediate level. Pure molybdenum, Mo-0.5Ti, and TZM were successfully coated with this pack cementation process. Substrate preparation, pack composition, heat transfer in the retort, and the process cycle were studied extensively to establish desired conditions for applying PFR-6 to components up to 1.5 ft long. Assemblies must be coated before and after riveting to obtain adequate protection. Two non-destructive measurements were found that will indicate within statistical limits expected coating life. The scale up of PFR-6 was accomplished with essentially no change in its previously established, statistically-proven lifetime and reliability. Average life remains approximately 1.4 hr in an oxyacetylene torch test exceeding 3000F. Recommendations are made for further scale-up of PFR-6 process to attain a capability for coating full-size re-entry vehicle components.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1964
- Accession Number
- AD0603203
Entities
People
- B. S. Payne Jr.
- G. J. Dormer
- P. J. Chao