Deposition of zirconium carbide coatings acting as diffusion barriers in composites consisting of a metallic matrix and refractory metal fibers
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A process has been developed for the deposition of ZrC-C protective coatings on 20- to 106-μ tungsten fibers. A thermodynamic calculation was made of the equilibrium in the system, and kinetic parameters were determined for the process of ZrC-C-coating deposition in the temperature range 1000–1500°C. The energy of activation for the linear rate of growth of these coatings is 21 ± 2 kcal/mole.
Tungsten fibers with ZrC-C protective coatings, have a tensile strength of 190–210 kg/mm2, were used for the preparation of a VK6-base composite alloy. By preventing the fibers and the matrix from reacting with each other during the preparation of the composite, the coatings increased the impact strength of specimens by 150–200%.
KeywordsZirconium Carbide Tensile Strength Tungsten Kinetic Parameter
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