HIGH-TEMPERATURE OXIDATION PROTECTIVE COATINGS FOR VANADIUM-BASE ALLOYS
Abstract
More than 40 coating materials were investigated for the oxidation protection of V-Nb alloy sheet specimens at 2000 to 2400 F and above. The wide range of coatings included flame-sprayed ceramics, roll-bonded Fe-Cr-Al, slurry-coated or fused Zn, Al, Ni and other alloys, liquid-phase sintered Cr-noble metal alloys, sintered intermetallic compounds, and pack-cemented diffusiontype coatings. The most promising system studied was a diffusion-type silicide applied to V-1w/o Ti-60w/o Nb by a pack cementation process. This coating afforded excellent protection for at least 1000, 290, and 50 hours in static air at 2000, 2200, and 2500 F, respectively, and a remarkable capacity for tolerating defects was noted. Ni, flame-sprayed on V-1w/o Ti-60w/o Nb, could be exposed directly to elevated-temperature air, and the coating life was 150 and 50 hrs at 2000 and 2200 F, respectively. The alloy Fe-25w/o Cr-5w/o Al roll-bonded to V-5w/o-20w/o Nb was protective for about 80 hours at 2000 F; good bonds were not obtained on the higher-Nb alloy. In most cases, coatings survived much longer on V-1w/o Ti-60Nb than on the vanadiumrich alloy. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1962
- Accession Number
- AD0282352
Entities
People
- F.c. Holtz
- John J. Rusch
Organizations
- IIT Research Institute