Corrosion-resistant buffer coating for solar thermal power generation

Abstract

The invention relates to a corrosion-resistant buffer coating for solar thermal power generation. The buffer coating is coated on the surface of a stainless steel substrate and is a TiAlNiFeY coating formed by Ti, Al, Ni, Fe and Y, wherein the content of Ti is 17.5 to 32.5 wt%, the content of Al is 4.2 to 7.8 wt%, the content of Ni is 7.2 to 12.8 wt%, the content of Y is 1.5 to 3.5 wt% and the balance is Fe. The buffer coating provided in the invention has good bonding performance with the stainless steel substrate and has excellent oxidation resistance and thermal cycling stress resistance; therefore, the problems of corrosion and falling-off between a metal substrate and a functional coating interface are effectively overcome, and the service life of a solar functional coating is beneficially increased.

Description

Technical field [0001] The present invention is a technical field of solar power generation. More specifically, the invention involves a solar thermal power generation and corrosion -resistant buffer coating. Background technique [0002] Solar heat power generation is an important technical approach to large -scale development and use of solar energy. At present, there are tower, slot, and discs. Among them, there are many commercial applications in slot and tower systems.So far, the only mature technology in the world after 20 years of commercial operation is far lower than photovoltaic power generation. [0003] The energy storage system of the grooved light heat power generation system can achieve 24 hours of operation. As the scale increases, the cost of power generation is also very competitive.In the mid -high temperature collecting tube, high -power conservation technology is generally used, and the concentration ratio can be as high as 80.The efficiency of light thermal ...

AI Technical Summary

Problems solved by technology

However, under high temperature conditions, because its infrared emissivity increases significantly with the rise of temperature, under the constant thermal shock between the metal substrate (such as stainless steel) and the solar functional coating, cracks will appear on the surface of the functional coating, and even The separation between the coating and the substrate allows the metal ions in the functional coating to diffuse or infiltrate into the metal substrate and react

The main reason for this phenomenon is that the matching between the coating material and the substrate is poor, especially the difference between the thermal expansion coefficient is large, the coating is very prone to stress cracking or peeling, and it is difficult to meet the long life of the substrate. The use requirements usually solve the problem of cracks and peeling of the coating due to the difference in thermal expansion performance. The method of spraying a buffer transition layer with a coefficient of thermal expansion between the buffer coating and the substrate is mainly used.