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Application of diffusion barriers to high modulus fibersBarrier layers were coated onto high-modulus fibers, and nickel and titanium layers were overcoated as simulated matrix materials. The objective was to coat the high-strength fibers with unreactive selected materials without degrading the fibers. The fibers were tungsten, niobium, and single-crystal sapphire, while the materials used as barrier coating layers were Al2O3, Y2O3, TiC, ZrC, WC with 14% Co, and HfO2. An ion-plating technique was used to coat the fibers. The fibers were subjected to high-temperature heat treatments to evaluate the effectiveness of the barrier layer in preventing fiber-metal interactions. Results indicate that Al2O3, Y2O3, and HfO2 can be used as barrier layers to minimize the nickel-tungsten interaction. Further investigation, including thermal cycling tests at 1090 C, revealed that HfO2 is probably the best of the three.
Document ID
19770049050
Document Type
Reprint (Version printed in journal)
Authors
Veltri, R. D. (United Technologies Research Center East Hartford, CT, United States)
Douglas, F. C. (United Technologies Research Center East Hartford, CT, United States)
Paradis, E. L. (United Technologies Research Center East Hartford, CT, United States)
Galasso, F. S. (United Technologies Research Center East Hartford, Conn., United States)
Date Acquired
August 8, 2013
Publication Date
April 1, 1977
Subject Category
COMPOSITE MATERIALS
Report/Patent Number
ACS PAPER 13-C-75
Distribution Limits
Public
Copyright
Other