Preparation method of novel high temperature anti-oxidation C/C composite coating

Abstract

The invention relates to a preparation method of a novel high temperature anti-oxidation C / C composite coating. A C / C composite material is adopted as the substrate, metal W is taken as the transition layer, platinum group metal Ir is employed as the coating, and the three layers of materials are compounded in order to obtain the composite coating. The C / C composite material has carbon fiber in transverse distribution and a density of 1.2-1.6g / cm, and is an ideal ultrahigh temperature thermal structure material in the aerospace field. The coating adopts the platinum group metal Ir with a thickness of 8microm-20microm, wherein the average crystal grain size of the coating is 1microm-2microm, and a double glow plasma surface alloying furnace is employed to deposit the Ir coating on the transition layer surface, Ir has a series of advantages of high strength, high melting point, good chemical stability, excellent oxidation resistance, no reaction with C at a temperature lower than 2280DEG C, and effective obstruction of C diffusion, etc. The invention brings the advantages of the composite structure and the excellent properties of all materials into play to make up for the shortcomings of insufficient oxidation under high temperature, high making cost and the like of the C / C composite coating, and realizes long-term, safe and stable work of the C / C composite material in a high temperature environment.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of a novel high-temperature oxidation-resistant C / C composite coating. Background technique [0002] C / C composite material is an ideal ultra-high temperature thermal structural material in the aerospace field. It has low density, high specific strength, high specific modulus, low thermal expansion coefficient, thermal shock resistance, creep resistance, ablation resistance, wear resistance, etc. The series of excellent properties, especially at 1000°C to 2300°C, the strength increases with the increase of temperature, and has been widely used in hypersonic aircraft nose cones, solid rocket motor nozzles and throat linings, aircraft brake discs, etc. [0003] However, C / C composites will start to oxidize at 370°C in the air, which will reduce the physical and mechanical properties of the composites and cause serious damage to the mater...

AI Technical Summary

Problems solved by technology

The surface density of the prepared material is greatly improved, and the oxidation resistance is improved, but gaps and holes will appear at high temperatures

[0006] There are many carbon / carbon composite coatings currently on the market, but considering the insufficient oxidation resistance of the existing carbon / carbon composite coatings, as well as the gaps, holes, and problems in the combination of the coating and the substrate, it is difficult to cope with high temperature environments and For demanding devices, it is necessary to explore a new method of preparing carbon / carbon composite coatings. It is reliable to use the advantages of multilayer composites to solve these problems one by one.