| 摘要 |
FIELD: metallurgy.SUBSTANCE: invention relates to the production of items from carbon-containing materials and is intended to protect them against oxidation under conditions of an oxidising medium at high temperatures. It can be used in the metallurgical industry and in other industries, including the aircraft industry. The method involves shaping on the surface of the item of a dross coating based on a composition consisting of a mixture of fine powders of carbon and a compound(s) that is(are) inert to silicone at least to 1600°C, and a temporary binding agent, heating of the item in vacuum up to 1600-1700°C in silicone vapours in a closed volume of the reactor, which provides for the capillary condensation of silicone vapours in pores of the coating at a temperature of 1300-1600°C, exposure at 1600-1700°C and cooling. As the compound(s) that is(are) inert to silicone, nitrides of metals or boron are used, which are decomposed with the release of volatile products at heating in a gas flow at a temperature of 1700-2000°C or converted under the specified conditions to silicides of the appropriate metals and/or triple compounds, the so called Nowotny phases, of MeSiCand/or MeSiC composition, where Me is metal.EFFECT: providing a possibility of using the coatings under conditions of an oxidising medium at the gas flow temperature of more than 1900°C.3 cl, 5 ex, 1 tbl |
