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选用铝酸盐、硅酸盐和磷酸盐,利用微弧氧化技术在MB15镁合金表面制备热控涂层。结果表明,3种体系的涂层表面宏观上呈黑色,微观上具备典型的多孔结构。各涂层厚度由大到小的顺序为:磷酸盐、硅酸盐、铝酸盐;粗糙度规律为:磷酸盐约等于硅酸盐,硅酸盐的大于铝酸盐的。磷酸盐涂层的热控性能最好。当涂层的黑度值越高,越有利于提高涂层的吸收率;而当涂层表面孔洞和突起尺寸变大、数量增多,能够提高表面对外辐射能量的能力,使发射率升高。提高电解液浓度,降低涂层的黑度值,不利于提高热控性能。热震测试结果表明,涂层的热稳定性良好。
Aluminate, silicate and phosphate were chosen to prepare thermal control coatings on MB15 magnesium alloy by micro-arc oxidation. The results show that the coating surface of the three systems is macroscopically black and has a typical porous structure microscopically. The descending order of coating thickness is phosphate, silicate and aluminate. The roughness law is that phosphate is about equal to silicate and silicate is larger than aluminate. Phosphate coatings have the best thermal control performance. The higher the blackness of the coating is, the better the coating absorptivity will be. The larger the number of holes and protrusions on the surface of the coating is, the higher the surface radiation energy is and the higher the emissivity will be. Increase the concentration of electrolyte, reduce the blackness of the coating is not conducive to improving thermal control performance. Thermal shock test results show that the thermal stability of the coating is good.