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High Temperature Oxidation Protective Coatings for Vanadium-Base Alloys

Author(s): L. I. Kane, J. J. Rausch, and F. C. Holtz
Corporate Author: Armour Research Foundation
Date of Publication: 1963-06-07
Pages: 19
Contract: N600 19 59182
AD Number: AD0406237
Original AD Number: AD-406 237

Abstract:
The influence of thermal history for a standardized pack siliconizing process has been established for 0.020- to 0.030-inch sheet of the V-60w/o b-1 w/o Ti alloy. Studies of coating thickness as a function of siliconizing time over thickness as a function of siliconizing time over the temperature range of 2000 to 2200 F were made. Coating thickness of 2.25 to 2.75 mils appears to offer optimum oxidation protection based on static air oxidation tests at 2200 F; specimens were exposed for more than 500 hours without evidence of failure. Thick coatings (4 mils or greater) suffer gross delamination or sever cracking during elastic bending of sheet materials which results in a loss of protective capability. The thicker coatings also appear to behave poorly in high temperature, thermal oxidation tests in an oxygen-hydrogen torch.

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