{"title":"以MgF2和Al2O3为烧结添加剂，低温烧结制备MgO陶瓷","authors":"Yicheng Xiao, Deqing Cheng, Guang Li, Ruiming Yin, Pengfei Li, Zhen Gao","doi":"10.1007/s10832-025-00391-3","DOIUrl":null,"url":null,"abstract":"<div><p>MgO ceramics with high density and superior properties were prepared from MgO powder using MgF₂ and Al₂O₃ as sintering aids via gelcasting and pressureless sintering. XRD, SEM and EDS were used to analyze the samples. The addition of MgF₂ and Al₂O₃ (with a ratio of Al₂O₃:MgF ₂ = 2–8:4) has been shown to enhance the densification and properties of MgO ceramics. This beneficial liquid phase may be attributed to the synergistic effects of liquid-phase sintering and spinelization reactions, which wet grain boundaries, promote particle rearrangement and mass transport, fill intergranular pores, and accelerate densification. At 1550 °C with an Al₂O₃:MgF ₂ ratio of 6:4, the MgO ceramics achieved optimal values for bulk density (3.331 g/cm<sup>3</sup>), thermal conductivity (39.2W/(m·K)), and flexural strength (63.15 MPa).</p></div>","PeriodicalId":625,"journal":{"name":"Journal of Electroceramics","volume":"53 3","pages":"281 - 292"},"PeriodicalIF":2.6000,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Preparation of MgO ceramics by low temperature sintering with MgF2 and Al2O3 as sintering additives\",\"authors\":\"Yicheng Xiao, Deqing Cheng, Guang Li, Ruiming Yin, Pengfei Li, Zhen Gao\",\"doi\":\"10.1007/s10832-025-00391-3\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>MgO ceramics with high density and superior properties were prepared from MgO powder using MgF₂ and Al₂O₃ as sintering aids via gelcasting and pressureless sintering. XRD, SEM and EDS were used to analyze the samples. The addition of MgF₂ and Al₂O₃ (with a ratio of Al₂O₃:MgF ₂ = 2–8:4) has been shown to enhance the densification and properties of MgO ceramics. This beneficial liquid phase may be attributed to the synergistic effects of liquid-phase sintering and spinelization reactions, which wet grain boundaries, promote particle rearrangement and mass transport, fill intergranular pores, and accelerate densification. At 1550 °C with an Al₂O₃:MgF ₂ ratio of 6:4, the MgO ceramics achieved optimal values for bulk density (3.331 g/cm<sup>3</sup>), thermal conductivity (39.2W/(m·K)), and flexural strength (63.15 MPa).</p></div>\",\"PeriodicalId\":625,\"journal\":{\"name\":\"Journal of Electroceramics\",\"volume\":\"53 3\",\"pages\":\"281 - 292\"},\"PeriodicalIF\":2.6000,\"publicationDate\":\"2025-03-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Electroceramics\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10832-025-00391-3\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, CERAMICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Electroceramics","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s10832-025-00391-3","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
Preparation of MgO ceramics by low temperature sintering with MgF2 and Al2O3 as sintering additives
MgO ceramics with high density and superior properties were prepared from MgO powder using MgF₂ and Al₂O₃ as sintering aids via gelcasting and pressureless sintering. XRD, SEM and EDS were used to analyze the samples. The addition of MgF₂ and Al₂O₃ (with a ratio of Al₂O₃:MgF ₂ = 2–8:4) has been shown to enhance the densification and properties of MgO ceramics. This beneficial liquid phase may be attributed to the synergistic effects of liquid-phase sintering and spinelization reactions, which wet grain boundaries, promote particle rearrangement and mass transport, fill intergranular pores, and accelerate densification. At 1550 °C with an Al₂O₃:MgF ₂ ratio of 6:4, the MgO ceramics achieved optimal values for bulk density (3.331 g/cm3), thermal conductivity (39.2W/(m·K)), and flexural strength (63.15 MPa).
期刊介绍：
While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including:
-insulating to metallic and fast ion conductivity
-piezo-, ferro-, and pyro-electricity
-electro- and nonlinear optical properties
-feromagnetism.
When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice.
The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.
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