Fabrication of MoSi;coatings on molybdenum and its high-temperature anti-oxidation properties  

钼基体表面二硅化钼涂层的制备及其高温抗氧化性能

作　　者：Lu ZHU Peng CHEN Zi-ming CAI Pei-zhong FENG Xue-qin KANG Farid AKHTAR Xiao-hong WANG 朱路;陈鹏;蔡子明;冯培忠;康学勤;Farid AKHTAR;王晓虹(中国矿业大学材料与物理学院,徐州221116;中国矿业大学化工学院,徐州221116;Division of Materials Science,LuleåUniversity of Technology,Luleå97187,Sweden)

机构地区：[1]School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China [2]School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China [3]Division of Materials Science,LuleåUniversity of Technology,Luleå97187,Sweden

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第3期935-946,共12页中国有色金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51874305, 51972338);Graduate Research and Innovation Projects of Jiangsu Province, China (No. KYCX21_22413)。

摘　　要：Industrial spent MoSi_(2)-based materials were used to fabricate oxidation-resistant coatings on molybdenum via slurry painting in air. The microstructure, phase constituent and high-temperature oxidation behaviors of the coatings at 1500 ℃ were explored. The results show that the bonding layer is generated in the coatings after sintering,which strengthens the metallurgical combination between the coating and the substrate because of the formation of diffusion layers. Rare cracks appear in the coating using pure MoSi_(2)(PM coating) while the coating using spent MoSi_(2)(SM coating) is free of cracks due to decreased thermal expansion mismatch. After oxidation, the oxide scale of PM coating possesses large-sized pores while a relatively dense oxide scale is acquired by SM coating. Compared with PM coating, thinner glassy oxide scale with lower mass gain is obtained by SM coating, exhibiting better anti-oxidation properties at 1500 ℃.以工业废弃硅化钼棒为原料,采用浆料涂刷法在钼表面制备MoSi_(2)基抗氧化涂层。研究涂层的显微组织、相组成及在1500℃的高温氧化行为。结果表明,以废弃硅化钼棒和纯MoSi_(2)粉末为原料制备的涂层和基体之间形成明显的连接层。纯MoSi_(2)制备的涂层(PM)在烧结后出现少量裂纹,而以废弃硅钼棒为原料制备的涂层(SM)在烧结后没有裂纹。1500℃氧化后,PM涂层的氧化膜存在较大尺寸的孔隙,而SM涂层表面氧化膜相对更完整和致密,且在氧化过程中质量增加更少,表现出更好的抗氧化性能。

关 键 词：recycling spent MoSi2 slurry painting anti-oxidation properties molybdenum substrate 

分 类 号：TG174.4[金属学及工艺—金属表面处理]