Process based on molten-salt growth method for metallizing surface of ceramic base composite material member

Abstract

The invention discloses a process based on the molten-salt growth method for metallizing the surface of a ceramic base composite material member, including the following steps: firstly, a molten salt mixed raw material is arranged in a fixed container; secondly, the ceramic base composite material member of which the surface is cleaned is embedded in the molten salt mixed raw material, temperature is raised to 800 to 1200 DEG C under inert atmosphere, and after the temperature is preserved for 1 to 5 hours the ceramic base composite material member is cooled to room temperature along with the furnace; and finally, the ceramic base composite material member is taken out, and the surface thereof is repeatedly cleaned and dried, thereby obtaining the ceramic base composite material member with the metallized surface. The technological process of the invention has the advantages of high preparation speed and efficiency, simple and easily executed operation and high bonding strength between an obtained metallized layer and the ceramic base composite material, thereby meeting the requirement on metallizing the ceramic base composite material member.

Description

technical field [0001] The invention relates to a method for processing the surface of a ceramic matrix composite material component, in particular to a method for metallizing the surface of a ceramic matrix composite material component. Background technique [0002] Realizing the surface metallization of ceramic matrix composites changes the physical and chemical properties of the surface and improves the wettability between ceramic matrix composites and metals, which plays a very important role in the application fields of ceramic matrix composites and metal sealing or connection. [0003] Ceramic matrix composites can be divided into particle-reinforced, whisker-reinforced, and fiber-reinforced according to the properties of the reinforcing phase. They have high specific strength, high specific stiffness, high temperature resistance, oxidation resistance, and erosion resistance. They are mainly used in aerospace , aviation, nuclear energy, transportation and other importa...

AI Technical Summary

Problems solved by technology

Among these methods, the Mo-Mn method uses the generated glass to connect metal and ceramics to achieve surface metallization, but this cannot meet the high-temperature performance requirements of the metallization layer; the sputtering method has a slow deposition rate and is not suitable for complex shapes. Surface metallization of ceramic matrix composite components; the ion plating process is complex and requires a high degree of vacuum, and for more complex components, the deposition thickness on different surfaces is different; sputtering and ion plating processes lead to metallization due to their physical deposition properties The layer and the substrate do not form a strong chemical bond, so the connection strength between the metallized layer and the substrate is also low; the prominent process problem of chemical vapor deposition is that the deposition temperature is high, the mechanical properties of the composite material after deposition may decrease, and at the same time, diffusion heat treatment is required after deposition To improve the connection strength between the deposited metal layer and the substrate

[0004] The surface metallization of ceramic matrix composites faces three problems: 1. It is difficult for ceramic matrix composites to form bonds directly with metals

2. The thermal expansion coefficients of ceramic materials and metal materials do not match

The thermal expansion coefficient of ceramic matrix composites is generally small, which is quite different from that of metals, which is prone to thermal stress and reduces the bonding strength between the metallized layer and ceramic matrix composites.

3. The complex surface properties of ceramic matrix composites make it difficult to completely cover the metallized layer

For example, C produced by precursor impregnation pyrolysis (PIP) process f There are a certain number of pores of different sizes on the surface of SiC ceramic matrix composites. If metallization cannot be realized on the inner surface of the pores, it is easy to leave oxidation channels, thereby reducing the high temperature performance of the material.

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