东北大学学报(自然科学版) ›› 2025, Vol. 46 ›› Issue (8): 149-155.DOI: 10.12068/j.issn.1005-3026.2025.20240183

• 研究论文 • 上一篇    

红外透明(Sc x Y1-x )2O3-MgO复相陶瓷的制备与性能

李晓东1,2, 穆浩洁1, 林本超1, 陆洋1   

  1. 1.东北大学 材料科学与工程学院,辽宁 沈阳 110819
    2.东北大学 材料各向异性与织构教育部重点实验室,辽宁 沈阳 110819
  • 收稿日期:2024-10-16 出版日期:2025-08-15 发布日期:2025-11-24
  • 通讯作者: 李晓东
  • 作者简介:李晓东(1971—),男,新疆木垒人,东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(52472065)

Preparation and Properties of Infrared Transparent (Sc x Y1-x )2O3-MgO Composite Ceramics

Xiao-dong LI1,2, Hao-jie MU1, Ben-chao LIN1, Yang LU1   

  1. 1.School of Materials Science & Engineering,Northeastern University,Shenyang 110819,China
    2.Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China.
  • Received:2024-10-16 Online:2025-08-15 Published:2025-11-24
  • Contact: Xiao-dong LI

摘要:

Sc2O3-MgO复相陶瓷是一种极具发展潜力的新型红外陶瓷材料,但较低的红外透过率限制了其应用.采用溶胶-凝胶法和热压烧结方法制备了不同原子分数Y2O3的Sc2O3-MgO复相陶瓷,并对其物相、微观结构和红外透过率进行了表征与研究.通过对比常压烧结样品的相对密度,发现Y2O3对(Sc x Y1-x )2O3-MgO陶瓷的致密化有促进作用.利用热压烧结技术获得了相对密度高于99%的一系列(Sc x Y1-x )2O3-MgO陶瓷.XRD结果表明,Y2O3与Sc2O3的比例较为接近(x=0.4~0.6)时,(Sc x Y1-x )2O3-MgO复相陶瓷中生成具有光学各向异性的钙钛矿型ScYO3相.用原子分数为20%的Y2O3代替部分Sc2O3形成低熔点的(Sc0.8Y0.2)2O3固溶体后,Sc2O3-MgO复相陶瓷的平均晶粒尺寸由498 nm降低至260 nm.在此基础上添加原子分数为3%的 Zr4+为烧结助剂,制备得到原子分数为3%的Zr4+:(Sc0.8Y0.2)2O3-MgO复相陶瓷,其具有190 nm的细小晶粒,最高红外透过率可达到85%.在保证高相对密度的条件下,复相陶瓷的晶粒细化是改善光学透过率的主要原因.

关键词: Sc2O3-MgO, 复相陶瓷, 红外透明, 微观结构, 组分调控

Abstract:

Sc2O3-MgO composite ceramics is a highly promising new type of infrared ceramic material, but its application is limited due to its low infrared transmittance. Sc2O3-MgO composite ceramics, incorporating varying atomic fractions of Y2O3, were fabricated via the sol-gel method and hot-press sintering. The phase composition, microstructure, and infrared transmittance of these ceramics were subsequently characterized and investigated, revealing that Y2O3 promoted the densification of (Sc x Y1-x2O3-MgO ceramics by comparing the relative densities of the pressureless sintered samples. A series of (Sc x Y1-x2O3-MgO ceramics with a ralative density higher than 99% were obtained using hot-press sintering technology. XRD results indicate that the perovskite-type ScYO3 phase with optical anisotropy is generated in the (Sc x Y1-x2O3-MgO composite ceramics when the ratio of Y2O3 to Sc2O3 is close (x=0.4~0.6). The average grain size of the Sc2O3-MgO composite ceramics decreased from 498 nm to 260 nm by replacing part of Sc2O3 with 20% Y2O3 atomic fraction to form a (Sc0.8Y0.22O3 solid solution with a low melting point. On this basis, Zr4+ with a 3% atomic fraction was added as a sintering aid to prepare a Zr4+:(Sc0.8Y0.22O3-MgO composite ceramics, fine grains of 190 nm, and a maximum infrared transmittance of 85%. Grain refinement of composite ceramics is the main factor in improving optical transmittance while ensuring high density.

Key words: Sc2O3-MgO, composite ceramics, infrared transparent, microstructure, component regulation

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