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CeO2掺杂Si-B复合涂层的制备及氧化行为

Preparation and Oxidation Behavior of CeO 2 Doped Si-B Composite Coatings
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摘要 采用两步包埋渗的方法在钼基体表面制备了不同CeO 2掺杂量的Si-B复合涂层,通过XRD、EDS和SEM分析了CeO 2掺杂对Si-B复合涂层在1150℃氧化前后表面物相和截面形貌的影响,并采用失重法研究了CeO 2掺杂前后Si-B复合涂层在1150℃下氧化160 h的氧化动力学行为。结果表明:适量CeO 2的掺杂对Si具有一定的催渗效果,当CeO 2掺杂量为1%(质量分数)时,所制备的Si-B复合涂层的厚度最大且均匀致密,但随着CeO 2掺杂量的增加,涂层厚度有所减小。CeO 2掺杂Si-B复合涂层在1150℃下氧化前70 h的氧化速率常数值(1.48×10-4 mg 2/(cm 4·h))较未掺杂时明显降低,这表明CeO 2掺杂Si-B复合涂层的高温抗氧化性能较好。 The Si-B composite coatings with different doping amount of CeO 2 were prepared on the surface of molybdenum substrate by two-step pack cementation methods.The effect of CeO 2 doping on phase structure and cross-section morphology of Si-B composite coatings before and after oxidation at 1150℃were analyzed by XRD,EDS and SEM.The oxidation kinetics of Si-B composite coatings before and after CeO 2 doping oxidized at 1150℃for 160 h were studied by mass-loss method.The results showed that appropriate doping amount of CeO 2 had certain per-meation effect on Si element in pack cementation process.The Si-B composite coatings with thick,uniform and dense structure were obtained when the doping amount of CeO 2 was fixed at 1wt%.However,the thickness of Si-B composite coatings decreased with the further increase of CeO 2 doping amount.The oxidation rate constant(1.48×10-4 mg 2/(cm 4·h))of the doped Si-B composite coating oxidized at 1150℃for 70 h was significantly lower than that without CeO 2 doping,which indicated that the Si-B composite coating doped with CeO 2 has better high temperature oxidation resistance.
作者 张勇 张耿飞 张宇涛 宁璠 晁奕 冯鹏发 ZHANG Yong;ZHANG Gengfei;ZHANG Yutao;NING Fan;CHAO Yi;FENG Pengfa(School of Material Science and Engineering,Chang’an University,Xi’an 710064,China;Postdoctoral Scientific Research Station of Mechanical Engineering,Chang’an University,Xi’an 710064,China;Technical Center,Jinduicheng Molybdenum Co.,Ltd.,Xi’an 710077,China)
出处 《材料导报》 EI CAS CSCD 北大核心 2020年第18期18035-18038,共4页 Materials Reports
基金 陕西省科技计划(2020GY-278 2020ZDLGY12-07) 中央高校基本科研业务费专项资金(300102318206) 国家自然科学基金(51301023) 国家级大学生创新创业训练计划(201910710152)。
关键词 两步包埋渗 Si-B复合涂层 CeO 2掺杂 molybdenum two-step pack cementation Si-B composite coating CeO 2 doping
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