| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to production of carbon articles and materials and is meant for protecting articles operating in oxidative medium conditions at high temperatures, for example in metallurgy industry, aircraft building and other industries, from oxidation. The method involves formation on the surface of the article of a slurry coating based on a composition consisting of a mixture of fine powder of carbon and a refractory metal or compound thereof and a binder, heating the article in silicon vapour in a vacuum in the volume of a reactor with subsequent ageing and cooling. The refractory metal or compound thereof used is Mo and/or W and/or "ÿ", and/or Zr and/or Hf, which are active towards silicon, and/or compounds thereof such as carbides and lower silicides of these metals, e.g., Mo2C, MoC, W2C, WC, TiC, ZrC, HfC, Mo5Si3, W5Si3, Ti5Si3, Zr5Si3, Hf5Si3 or similar. The article is heated in silicon vapour at pressure 1-36 mm Hg to temperature 1500-1750C and held in said temperature interval and pressure for 1-3 hours, after which the article is cooled in silicon vapour. Heating from 1000C to 1500-1750C is preferably carried out at a rate of not more than 150/h with isothermic ageing at temperatures where chemical reactions for forming silicides are intense. ^ EFFECT: high heat resistance and wider range of obtained coatings. ^ 2 cl, 3 tbl |
