Non-vacuum groove barrier coating for solar power generation

Abstract

The invention relates to a non-vacuum groove barrier coating for solar power generation, which is coated on the surface of a stainless steel metal matrix. The protective coating is a mixed coating consisting of 52.5 to 67.5 weight percent of titanium dioxide, 22.5 to 32.5 weight percent of ytterbium oxide and the balance of yttrium oxide. The protective coating is coated between the stainless steel matrix and a solar functional coating and has high oxidation resistance and thermal cyclic stress resistance, the problem of corrosion and oxidation between the metal matrix and a functional coating interface is effectively solved, and the service life of the solar functional coating is prolonged.

Description

technical field [0001] The invention belongs to the field of solar power generation, and more specifically, the invention relates to a barrier coating for non-vacuum groove type solar power generation. Background technique [0002] Solar thermal power generation is an important technical approach for large-scale development and utilization of solar energy. At present, there are tower, trough, and dish systems, among which trough and tower systems are more commercially used, especially trough solar thermal power generation, which is the most popular so far. So far, it is the only mature technology in the world that has been commercialized for 20 years, and its cost is much lower than that of photovoltaic power generation. [0003] The energy storage system of the trough-type concentrating thermal power generation system can realize 24-hour operation. With the increase of scale, the cost of power generation is also very competitive. In medium and high temperature heat collect...

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 protective coating and the substrate is mainly used.