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电解液体系对镁合金热控涂层结构和性能的影响

DOI: 10.14062/j.issn.0454-5648.2015.12.09

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Abstract:

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。

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