A kind of electric arc spraying wire material and its preparation and spraying method

Abstract

The invention relates to an electric arc spraying wire material and a preparation and spraying method thereof. The coating is prepared by arc spraying process, the spraying material is aluminum-based ceramic powder core wire, and the spraying base material is steel or aluminum. The spraying material is a ceramic powder core structure covered with aluminum skin. The outer diameter of the wire material is a ceramic powder core made of a mixture of micron-level Al2O3, nano-level Al2O3, micron-level SiO2 and nano-level SiO2. The aluminum strip is bent into a " U-shaped", evenly filled with ceramic powder core, through the mold to tightly cover the powder core with aluminum tape, and drawn into a sprayed wire material with an outer diameter. The mass content of the ceramic powder core in the wire material is 20% to 28%. The test results meet the coating static friction coefficient > 0.9, bonding strength ≥ 20MPa, and the coating has no bubbling failure after 360h salt spray corrosion test, which can better meet the application requirements.

Description

technical field [0001] The invention relates to an electric arc spraying wire material and a preparation and spraying method thereof, belonging to the field of environmental protection. Background technique [0002] During the design and development of the new-generation launch platform for launch vehicles, a protective coating needs to be applied to the surface to prevent equipment damage caused by the high-temperature and high-speed gas flow on the launch platform from erosion and ablation during rocket take-off. At the same time, compared with the traditional launch platforms in the past, the new-generation carrier rocket launch platform is in service in Hainan. It is affected by the marine climate during storage, transportation, and use, and the anti-corrosion performance of the product is greatly tested. [0003] The existing domestic rocket launch platform coating system mainly adopts the epoxy organic coating developed by 703 or the inorganic concrete structure materi...

AI Technical Summary

Problems solved by technology

[0003] The existing domestic rocket launch platform coating system mainly adopts the epoxy organic coating developed by 703 or the inorganic concrete structure material developed by Dalian Chemical Industry. Thinning, increased pores, severe local damage, greatly reduced high temperature resistance and corrosion resistance

Therefore, after each launch, it takes a lot of labor and periodic maintenance for the damaged area, especially for large-area parts such as conversion devices and service towers. The cost and cycle of maintenance are difficult to meet the needs of high-intensity and high-frequency launches. , seriously affecting the progress of product use

At the same time, since the launch platform is located in Hainan's hot and humid ocean climate, the original coating scheme does not have weather resistance. Long-term storage or use will cause corrosion failures such as coating peeling and mold, which will have a destructive impact on the launch platform and greatly shorten Its protective effect and service life

[0004] Therefore, in the face of the high temperature erosion resistance and anti-corrosion performance requirements of the protective coating of the active launch platform of the launch vehicle, the multi-function matching performance of the coating should be improved through the design optimization of the coating material system and the research on the integrated coating preparation technology To solve the problems of single coating function, low service life and poor reliability, it is necessary to improve the comprehensiveness and service life of its functions to meet the needs of use

[0005] The invention patent with application number 201510009704X discloses a preparation method of arc spraying wire, using Al 2 o 3 The powder is prepared by adding SiC powder to the powder. The coating obtained by spraying has the properties of high temperature resistance, wear resistance and anti-skid, but the surface roughness is high, the Ra value is 60-200 μm, and the corrosion resistance is poor. The outer diameter of the material is 3mm, and the distribution of the coating metal phase and ceramic phase is poor. It is suitable for ship decks, runways, etc. The requirements for wear resistance are low, but the requirements for corrosion resistance and weather resistance are high, and the parts that need to be painted do not meet the requirements.

Images