OXIDATION RESISTANT HIGH TEMPERATURE PROTECTIVE COATINGS FOR TUNGSTEN. Quarterly Progress Report No. 7, November 1, 1962-January 31, 1963
Technical Report
·
OSTI ID:4749225
An improved and simplified coating process was developed to apply the Ti- - Zr--(Si--W)--O complex coating to tungsten sheet. A series of W + Ti--Zr-(Si-- W)--O coated systems were prepared and tested under cyclic conditions in air at temperatures of 1800, 2500, 3000, and 3450 deg F. Total exposures of 72 hours at 3000 deg F, 26 hours at 3300 deg F and 10 hours at 3450 deg F were achieved under cyclic conditions. Formation of an improved W + (Si--W) coated system was accomplished utilizing more efficient techniques for deposition of the (Si--W) coating layer on tungsten sheet. Cyclic oxidation tests of the W + (Si--W) system prepared by this technique were conducted in the 1800 to 3300 deg F temperature range. Additions of molybdenum were made to the W + Ti--Zr--(Si--W) and W + (Si--W) systems during the (Si-W) coating cycle using co-deposition techniques. These systems were subjected to cyclic oxidation tests at ducted on the W + Ti--Zr--(Si--W)-O and W + (Si--W)--O systems at 3500 and 3600 deg F. The maximum temperature capabilities of both coating systems under a high velocity flow of simuiated air were determined. Thermal shock tests at 3000 deg F were conducted on preoxidized W + Ti-Zr- (Si--W)--O and W + (Si--W)--O coated systems. Results of the current tests indicate that the limiting factor in the protective life of coated tungsten is the sensitivity of the tungsten base metal to thermal shock cracking. (auth)
- Research Organization:
- TAPCO. Div. of Thompson Ramo Wooldridge Inc., Cleveland
- NSA Number:
- NSA-17-014837
- OSTI ID:
- 4749225
- Report Number(s):
- NP-12595; TM-3612-67
- Country of Publication:
- United States
- Language:
- English
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