原位生成Fe-Al/Al_2O_3复合陶瓷涂层  

In-situ Synthesis of Fe-Al/Al_2O_3 Composite Ceramic Coatings

作　　者：张景德[1,2] 李厚义 苟金艳[1] 丁昌库 邢丽娟[1] 

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061 [2]山东大学特种聚集体材料教育部重点实验室,济南250100

出　　处：《人工晶体学报》2015年第3期616-620,626,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(50942024)

摘　　要：采用化学镀法制备Fe包覆Al核(Al)-壳(Fe)结构复合粉体,以Fe-Al复合粉体为喷涂材料,利用等离子喷涂法在Q235钢基体上制备涂层,在喷涂过程中Fe、Al反应生成Fe-Al金属间化合物和Al2O3,通过控制Fe-Al和Al2O3粉体的混合比例实现涂层的梯度化。利用SEM、XRD研究涂层微观结构与组成,并测试分析了涂层的抗热震性与结合强度。结果表明,涂层主要由Al2O3、Al、Fe3Al和Fe O等组成,喷涂过程中Fe-Al发生反应原位生成了Fe3Al金属间化合物,以Fe-Al为底层的Fe Al/Al2O3梯度涂层的结合强度和抗热震性均明显高于Al2O3涂层,涂层成分的梯度分布和Fe3Al的原位形成改善了涂层的结合状态,提高了结合强度和抗热震性。Composite powder of Fe（ as shell） and Al（ as nuclear）（ Fe-Al） was produced by electroless plating. Using Q235 steel as substrate,Fe-Al and Al2O3 composite powders as coating materials,the FeAl intermetallic coatings were fabricated by plasma spraying. Fe-Al intermetalic compounds were formed under thermal spray process from Fe-Al coated powders. Coating composition gradient was achieved by real-time control of mixing ratio of Fe-Al coated powders and Al2O3 powders during the deposition processes. The phase and microstructure of the coatings were studied by SEM and XRD. Adhesive strength and thermal-shock resistance of coatings were also tested. The results indicate that the coatings are composed of Al2O3,Al,Fe3 Al and Fe O. The intermetallic is in-situ synthesized from Fe-Al. When Fe-Al as bottom combines steel substrate,the bonding strength and thermal shock resistance of Fe Al /Al2O3 graded coatings is remarkably higher than Al2O3 coating. The gradient change distribution and the in-situ synthesis of composition improve the combining state and increase the bonding strength and thermal shock resistance of coatings.

关 键 词：化学镀 Fe-Al/Al2O3复合陶瓷涂层 原位生成 结合强度 抗热震性 

分 类 号：TG154.5[金属学及工艺—热处理]