Abstract
Scientific publications on the methods of applying heat-resistant coatings to refractory metals, such as molybdenum, tungsten, niobium, tantalum, and their alloys, are analyzed. Vacuum-activated diffusion hardening is considered to be one of the most optimal methods of depositing protective coatings. For niobium and tantalum, a molybdenum or tungsten layer is required to be preliminary applied by one of the three methods: vapor-phase deposition, condensation, or ion bombardment. The materials used for the production of protective coatings are studied: silicides, refractory metal borides, high-temperature oxides, and enamels.
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