Chu Cheng, Xin-Yu Wang, Ting-An Zhang, Zhi-He Dou, Ke-Xing Song, Meng-Xin Wang, Yan-Shuo Feng, Tao Huang, Hai-Tao Liu, Xiao-Heng Li, Kai Li
{"title":"通过冶金热还原法制备铜瓦复合材料过程中的原位造渣强化金属渣分离","authors":"Chu Cheng, Xin-Yu Wang, Ting-An Zhang, Zhi-He Dou, Ke-Xing Song, Meng-Xin Wang, Yan-Shuo Feng, Tao Huang, Hai-Tao Liu, Xiao-Heng Li, Kai Li","doi":"10.1007/s12598-024-02820-8","DOIUrl":null,"url":null,"abstract":"<p>CuW is widely used in high-voltage electrical switch contacts, rocket nozzle throat linings, electronic packaging materials and other major high-end technologies. CuW is typically fabricated using infiltration and high-temperature sintering methods based on powder metallurgy. As CuW composites fabricated using these methods have the disadvantages of low density and uneven microstructural distribution, the preparation of CuW composites by aluminothermic reduction was proposed. However, some Al<sub>2</sub>O<sub>3</sub> inclusions produced by aluminothermic reduction do not effectively combine with the slag-making agent CaO to form a liquid slag phase and remain in the CuW composite, resulting in a small number of Al<sub>2</sub>O<sub>3</sub> inclusions in the CuW composites. To overcome this problem, a novel methodology for strengthening metal-slag separation through in situ slagging is proposed. In this study, CuW composites were prepared by metallothermic reduction using Al, AlCa and AlMg as reducing agents. The CuW composites and slag samples were systematically analyzed. The results indicate that the Al<sub>2</sub>O<sub>3</sub> particles produced by aluminothermic reduction can be modified in situ into calcium aluminate and MgO·Al<sub>2</sub>O<sub>3</sub> with lower melting points by using AlCa and AlMg alloys as reducing agents, which strengthens the metal-slag separation. Moreover, AlCa and AlMg exhibited refining effects on the tungsten particles of the CuW composite, where the effect of AlMg was greater than that of AlCa. The slag obtained using the AlCa alloy as a reducing agent was mainly composed of CaWO<sub>4</sub>, CaAl<sub>4</sub>O<sub>7</sub> and Ca<sub>4</sub>Al<sub>6</sub>O<sub>12</sub>WO<sub>4</sub>, whereas that obtained using the AlMg alloy was mainly composed of CaWO<sub>4</sub>, MgAl<sub>2</sub>O<sub>4</sub> and Ca<sub>4</sub>Al<sub>6</sub>O<sub>12</sub>WO<sub>4</sub>.</p><h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\n","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":null,"pages":null},"PeriodicalIF":9.6000,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Metal-slag separation strengthening through in situ slagging during CuW composite preparation by metallothermic reduction\",\"authors\":\"Chu Cheng, Xin-Yu Wang, Ting-An Zhang, Zhi-He Dou, Ke-Xing Song, Meng-Xin Wang, Yan-Shuo Feng, Tao Huang, Hai-Tao Liu, Xiao-Heng Li, Kai Li\",\"doi\":\"10.1007/s12598-024-02820-8\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>CuW is widely used in high-voltage electrical switch contacts, rocket nozzle throat linings, electronic packaging materials and other major high-end technologies. CuW is typically fabricated using infiltration and high-temperature sintering methods based on powder metallurgy. As CuW composites fabricated using these methods have the disadvantages of low density and uneven microstructural distribution, the preparation of CuW composites by aluminothermic reduction was proposed. However, some Al<sub>2</sub>O<sub>3</sub> inclusions produced by aluminothermic reduction do not effectively combine with the slag-making agent CaO to form a liquid slag phase and remain in the CuW composite, resulting in a small number of Al<sub>2</sub>O<sub>3</sub> inclusions in the CuW composites. To overcome this problem, a novel methodology for strengthening metal-slag separation through in situ slagging is proposed. In this study, CuW composites were prepared by metallothermic reduction using Al, AlCa and AlMg as reducing agents. The CuW composites and slag samples were systematically analyzed. The results indicate that the Al<sub>2</sub>O<sub>3</sub> particles produced by aluminothermic reduction can be modified in situ into calcium aluminate and MgO·Al<sub>2</sub>O<sub>3</sub> with lower melting points by using AlCa and AlMg alloys as reducing agents, which strengthens the metal-slag separation. Moreover, AlCa and AlMg exhibited refining effects on the tungsten particles of the CuW composite, where the effect of AlMg was greater than that of AlCa. The slag obtained using the AlCa alloy as a reducing agent was mainly composed of CaWO<sub>4</sub>, CaAl<sub>4</sub>O<sub>7</sub> and Ca<sub>4</sub>Al<sub>6</sub>O<sub>12</sub>WO<sub>4</sub>, whereas that obtained using the AlMg alloy was mainly composed of CaWO<sub>4</sub>, MgAl<sub>2</sub>O<sub>4</sub> and Ca<sub>4</sub>Al<sub>6</sub>O<sub>12</sub>WO<sub>4</sub>.</p><h3 data-test=\\\"abstract-sub-heading\\\">Graphical Abstract</h3>\\n\",\"PeriodicalId\":749,\"journal\":{\"name\":\"Rare Metals\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":9.6000,\"publicationDate\":\"2024-06-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Rare Metals\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1007/s12598-024-02820-8\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Rare Metals","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s12598-024-02820-8","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Metal-slag separation strengthening through in situ slagging during CuW composite preparation by metallothermic reduction
CuW is widely used in high-voltage electrical switch contacts, rocket nozzle throat linings, electronic packaging materials and other major high-end technologies. CuW is typically fabricated using infiltration and high-temperature sintering methods based on powder metallurgy. As CuW composites fabricated using these methods have the disadvantages of low density and uneven microstructural distribution, the preparation of CuW composites by aluminothermic reduction was proposed. However, some Al2O3 inclusions produced by aluminothermic reduction do not effectively combine with the slag-making agent CaO to form a liquid slag phase and remain in the CuW composite, resulting in a small number of Al2O3 inclusions in the CuW composites. To overcome this problem, a novel methodology for strengthening metal-slag separation through in situ slagging is proposed. In this study, CuW composites were prepared by metallothermic reduction using Al, AlCa and AlMg as reducing agents. The CuW composites and slag samples were systematically analyzed. The results indicate that the Al2O3 particles produced by aluminothermic reduction can be modified in situ into calcium aluminate and MgO·Al2O3 with lower melting points by using AlCa and AlMg alloys as reducing agents, which strengthens the metal-slag separation. Moreover, AlCa and AlMg exhibited refining effects on the tungsten particles of the CuW composite, where the effect of AlMg was greater than that of AlCa. The slag obtained using the AlCa alloy as a reducing agent was mainly composed of CaWO4, CaAl4O7 and Ca4Al6O12WO4, whereas that obtained using the AlMg alloy was mainly composed of CaWO4, MgAl2O4 and Ca4Al6O12WO4.
期刊介绍:
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.