Spray coating material prepared by titanium-containing high-chromium-nickel alloy, preparation method and use thereof

Abstract

The invention relates to a titanium contained high chromel alloy and application thereof in spraying materials. The components of the alloy are (by weight percentage) as follows: the content of chromium is more than or equal to 15 percent and less than or equal to 25 percent, the content of titanium is more than or equal to 1 percent and less than or equal to 6 percent, the content of silicon is more than or equal to 1 percent and less than or equal to 6 percent, the content of carbon is more than or equal to 0 percent and less than or equal to 0.02 percent, the content of nickel is more than or equal to 20 percent and less than or equal to 55 percent, the content of rhenium is more than or equal to 0.5 percent and less than or equal to 6 percent, the content of aluminum is more than or equal to 0 percent and less than or equal to 6 percent, the content of sulfur is more than or equal to 0 percent and less than or equal to 0.035 percent, he content of phosphorus is more than or equal to 0 percent and less than or equal to 0.035 percent, the content of manganese is more than or equal to 0 percent and less than or equal to 0.2 percent, and the rest is iron. After the parts of working equipment are sprayed at high temperature oxidation and high temperature corrosion environments by the spraying material produced by the alloy, since the coating has good high temperature oxidation and vulcanization resistance and hot corrosion resistance performances, the service life of the parts can be greatly improved.

Description

technical field [0001] The invention relates to a titanium-containing high-chromium-nickel alloy, in particular to a titanium-containing high-chromium-nickel alloy wire material and a preparation method and application thereof. Background technique [0002] my country's power station boilers and industrial boilers are mainly coal-fired. As the world pays more and more attention to issues such as resources and environmental pollution, although the share of natural gas, nuclear energy and other renewable energy in power production will increase year by year, it is predicted that until 50 years later, coal will As the share of our country's electric energy will exceed 50%. [0003] In coal-fired power plants, boilers are exposed to high-temperature environments for a long time. Due to the action of flue gas or ash suspended in it, high-temperature corrosion will occur to varying degrees, including high-temperature oxidation, high-temperature sulfate corrosion, sulfidation corr...

AI Technical Summary

Problems solved by technology

In China, the main spraying protection technologies currently used are: aluminum spraying protection, because the melting point of aluminum is as low as 660.4°C, it works well in low temperature environments, its creep resistance is low, and its wear resistance is poor. High temperature and high pressure boiler "four tubes" These factors make the protective effect after spraying aluminum unsatisfactory; spray welding Ni-W alloy coating, although the spray welding layer is well bonded, wear and corrosion are slight, but its technology is not enough. The problem is that the remelting temperature is too high, causing the pipe to deform, and it is difficult to use it in a large area; in China, aluminizing and chromizing are also used for protection, but the hot dipping process is generally only suitable for coatings composed of a single element, and the method requires The higher working temperature (generally between 750-1100 ℃) will have a certain impact on the structure and performance of the matrix material, and the protection effect is not good

Compared with foreign countries, my country started late in the protection of boiler tubes, and lacks coating materials suitable for the harsh working conditions of boiler operation and having excellent high-temperature corrosion resistance.