| 摘要 |
FIELD: powder metallurgy; application of high-temperature sealing coats for gas-turbine engines. ^ SUBSTANCE: reinforcing layer is made in form of woven-type gauze whose lower ridges are secured on surface of part; wire is secured on upper ridges of gauze perpendicularly to surface of part and is cut at height equal to or lesser than thickness of sealing coat. Materials of gauze and wire are close by chemical composition to composition of material of part. Sealing coat is applied in form of slip at moisture content of 28-32% at the following ratio of components, mass-%: zirconium dioxide stabilized by 7% of yttrium oxide of 100-250 mcm fraction, 10-15; boron nitride of 450-630 mcm fraction, 15-25; nichrome fiber, 3-5m long, 9-12; the remainder being zirconium dioxide stabilized by 7% of yttrium oxide of activated dust-like fraction. Then coat is subjected to drying and hot compacting in vacuum at heating to temperature of 1100°C. ^ EFFECT: enhanced adhesion and cohesion of ceramic coat with metal of part. ^ 2 cl, 1 tbl, 1 ex |
