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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

用内凝胶法制备球形Y2O3-ZrO2等离子喷涂粉料

李建军1; 姜长印1; 万春荣1; 吴宇平1; 郝建民2   

  1. 1. 清华大学核能技术设计研究院新型能源与材料化学研究室; 北京 100084; 2. 天津电子部46所, 天津 300192
  • 收稿日期:1999-06-08 修回日期:1999-07-22 出版日期:2000-06-20 网络出版日期:2000-06-20

  1. Synthesis of Yttria-Stabilized Zirconia Powders for Plasma Spray by Internal Gelation

LI Jian-Jun1; JIANG Chang-Yin1; WAN Chun-Rong1; WU Yu-Ping1; HAO Jian-Min2   

  1. 1. Institute of Nuclear Energy Technology; Tsinghua University; Beijing 100084; China; 2. TianjinElectronic Materials Research Institute; Tianjin 300192; China
  • Received:1999-06-08 Revised:1999-07-22 Published:2000-06-20 Online:2000-06-20

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摘要： 以无机物为前驱物，用内凝胶法制备了适合于等离子喷涂的、粒径在10～50μm范围内的、用氧化钇稳定的氧化锆（YSZ）球形粉末，实验结果表明，通过改变乳化条件可以控制这种粉末的形貌、粒径和粒度分布．利用SEM和光学显微镜观察发现，用该方法得到的粉末主要是球形的，并且符合粒径分布的要求（5～50μm）．致密的球形粉末显示出良好的流动性．差热分析表明，用47mol％氧化钇稳定的氧化锆（YSZ）粉末在468℃有一放热峰，是YSZ粉末的相转变温度．XRD分析表明，上述粉末在800℃条件下煅烧可以得到100％非平衡四方相（t’）的YSZ粉末，没有单斜相存在．

关键词: 钇稳定的氧化锆, 内凝胶法, 乳化, 等离子喷涂, 非平衡四方相（t’）

Abstract: Chemical uniform, high-purity spray-grade zirconia powders doped with variable ratios of yttria for
ceramic thermal barrier coatings were prepared by an internal gelation process. Both the morphology and particle size of the powders can be
controlled by varying the emulsification conditions. Scanning electron microscopic and optical microscopic observations revealed the materials
thus obtained to have a predominantly spherical morphology and the requisite size distribution (5～50μm). The dense, calcined
micro-spheres showed good flowability. Differential Thermal Analysis (DTA) of 4.7mol% Y2O3-ZrO2 powders (dried at 80℃) indicated that m→’ transformation was happened at 468℃.
X-ray diffraction results showed that the crystalline phase of such powders after calcination at 800℃ was 100% nontransformable tetragonal.

Key words: yttria-stabilized zirconia (YSZ) powders, plasma spraying, internal gelation, emulsification, nontransformable tetragonal phase

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