Wenfu Chen, Linwei Zhang, Dan Wu, Chang Jiang, Siqi Zen, Xuebin Yang, Song Zen, Jiuming Yu
{"title":"热处理后烧结钕铁硼磁体冷喷涂Al涂层的耐蚀性、力学性能和磁性能","authors":"Wenfu Chen, Linwei Zhang, Dan Wu, Chang Jiang, Siqi Zen, Xuebin Yang, Song Zen, Jiuming Yu","doi":"10.1016/j.jmmm.2025.173265","DOIUrl":null,"url":null,"abstract":"<div><div>A protective aluminum coating was deposited on the sintered NdFeB substrate by cold spray. A follow-up annealing at 450 °C, 500 °C and 550 °C was carried out to improve the properties of the coated magnet. Then, the effects of heat treatment temperature on the corrosion resistance, mechanical and magnetic properties of the cold-sprayed Al coatings on the sintered NdFeB magnet were studied. It was found that a higher value of corrosion potential and a lower value of corrosion current density for the heat-treated coating, exhibiting better corrosion resistance. And, the tendency of anti-corrosion improved with the temperature of heat treatment rise. The average bonding strength of the Al-coated NdFeB increased from 20.69 ± 1.71 MPa before treatment to 49.23 ± 2.21 MPa (treated at 450 °C), indicating that post heat treatment can significantly improve the bonding strength of the Al coating on the NdFeB substrate. The maximum magnetic energy product, and remanence decreased for the Al-coated NdFeB compared with the sintered NdFeB, with the different amplitude of 16.8 %, 2.3 %, 9.4 %, respectively. After heat treatment, the value of maximum magnetic energy product and remanence of the Al-coated NdFeB increased compared with untreated samples, and the value increased further as the temperature of heat treatment rise. But, the value of the intrinsic coercive field reduced after heat treatment, and the value fluctuated slightly as the temperature of heat treatment rise. The reasons for the abnormal results could be attribute to the NdFeB debris in the coating generated from the process of cold spray.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173265"},"PeriodicalIF":2.5000,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Corrosion resistance, mechanical and magnetic properties of cold-sprayed Al coating on the sintered NdFeB magnet after heat treatment\",\"authors\":\"Wenfu Chen, Linwei Zhang, Dan Wu, Chang Jiang, Siqi Zen, Xuebin Yang, Song Zen, Jiuming Yu\",\"doi\":\"10.1016/j.jmmm.2025.173265\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>A protective aluminum coating was deposited on the sintered NdFeB substrate by cold spray. A follow-up annealing at 450 °C, 500 °C and 550 °C was carried out to improve the properties of the coated magnet. Then, the effects of heat treatment temperature on the corrosion resistance, mechanical and magnetic properties of the cold-sprayed Al coatings on the sintered NdFeB magnet were studied. It was found that a higher value of corrosion potential and a lower value of corrosion current density for the heat-treated coating, exhibiting better corrosion resistance. And, the tendency of anti-corrosion improved with the temperature of heat treatment rise. The average bonding strength of the Al-coated NdFeB increased from 20.69 ± 1.71 MPa before treatment to 49.23 ± 2.21 MPa (treated at 450 °C), indicating that post heat treatment can significantly improve the bonding strength of the Al coating on the NdFeB substrate. The maximum magnetic energy product, and remanence decreased for the Al-coated NdFeB compared with the sintered NdFeB, with the different amplitude of 16.8 %, 2.3 %, 9.4 %, respectively. After heat treatment, the value of maximum magnetic energy product and remanence of the Al-coated NdFeB increased compared with untreated samples, and the value increased further as the temperature of heat treatment rise. But, the value of the intrinsic coercive field reduced after heat treatment, and the value fluctuated slightly as the temperature of heat treatment rise. The reasons for the abnormal results could be attribute to the NdFeB debris in the coating generated from the process of cold spray.</div></div>\",\"PeriodicalId\":366,\"journal\":{\"name\":\"Journal of Magnetism and Magnetic Materials\",\"volume\":\"629 \",\"pages\":\"Article 173265\"},\"PeriodicalIF\":2.5000,\"publicationDate\":\"2025-06-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Magnetism and Magnetic Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0304885325004974\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Magnetism and Magnetic Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0304885325004974","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Corrosion resistance, mechanical and magnetic properties of cold-sprayed Al coating on the sintered NdFeB magnet after heat treatment
A protective aluminum coating was deposited on the sintered NdFeB substrate by cold spray. A follow-up annealing at 450 °C, 500 °C and 550 °C was carried out to improve the properties of the coated magnet. Then, the effects of heat treatment temperature on the corrosion resistance, mechanical and magnetic properties of the cold-sprayed Al coatings on the sintered NdFeB magnet were studied. It was found that a higher value of corrosion potential and a lower value of corrosion current density for the heat-treated coating, exhibiting better corrosion resistance. And, the tendency of anti-corrosion improved with the temperature of heat treatment rise. The average bonding strength of the Al-coated NdFeB increased from 20.69 ± 1.71 MPa before treatment to 49.23 ± 2.21 MPa (treated at 450 °C), indicating that post heat treatment can significantly improve the bonding strength of the Al coating on the NdFeB substrate. The maximum magnetic energy product, and remanence decreased for the Al-coated NdFeB compared with the sintered NdFeB, with the different amplitude of 16.8 %, 2.3 %, 9.4 %, respectively. After heat treatment, the value of maximum magnetic energy product and remanence of the Al-coated NdFeB increased compared with untreated samples, and the value increased further as the temperature of heat treatment rise. But, the value of the intrinsic coercive field reduced after heat treatment, and the value fluctuated slightly as the temperature of heat treatment rise. The reasons for the abnormal results could be attribute to the NdFeB debris in the coating generated from the process of cold spray.
期刊介绍:
The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public.
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