High perfomance thermally-sprayed absorber coating

A method for coating by thermal spraying a substrate (3) for solar applications with a temperature-resistant and high-absorbance ceramic micro-structured coating (1), comprising the following steps :- preparing a powder mixture (2) comprising ceramic microparticles powder and polyester microballs powder, the percentage of the polyester microballs in the powder mixture (2) being comprised between10 and 30 % w/w; - spraying the powder mixture (2) onto the substrate (3) by a thermal spray process in order to apply a coating layer (1) on the substrate (3); - heating the substrate (3) having thecoating layer (1) to a temperature of at least 400 DEG C so as to evaporate the microballs of polyester from the coating layer (1), leaving porosities (4) at the place of the polyester microballs, wherein spraying step parameters and particle size are chosen so that the coating layer (1) is applied in a thickness comprised between 50 and 150 microns. 一种用于利用耐温且高吸收性陶瓷微结构涂层(1)通过热喷涂来涂覆用于太阳能应用的基材(3)的方法，其包括以下步骤：-制备包含陶瓷微粒粉末和聚酯微球粉末