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Al粉含量对Y2O3基陶瓷型芯性能及组织的影响

芦刚 吴谦 陈晓 陈义斯 文艳波 严青松

芦刚, 吴谦, 陈晓, 等. Al粉含量对Y2O3基陶瓷型芯性能及组织的影响[J]. 复合材料学报, 2023, 42(0): 1-9.
引用本文: 芦刚, 吴谦, 陈晓, 等. Al粉含量对Y2O3基陶瓷型芯性能及组织的影响[J]. 复合材料学报, 2023, 42(0): 1-9.
LU Gang, WU Qian, CHEN Xiao, et al. Effect of Al powder content on the properties and microstructure of Y2O3-based ceramic core[J]. Acta Materiae Compositae Sinica.
Citation: LU Gang, WU Qian, CHEN Xiao, et al. Effect of Al powder content on the properties and microstructure of Y2O3-based ceramic core[J]. Acta Materiae Compositae Sinica.

Al粉含量对Y2O3基陶瓷型芯性能及组织的影响

基金项目: 国家自然科学基金项目(52265051);江西省教育厅科学技术研究项目(GJJ2201118)
详细信息
    通讯作者:

    陈晓,博士,讲师,研究方向为熔模铸造陶瓷铸型 E-mail: chenxiao@nchu.edu.cn

  • 中图分类号: TG249.5;TB333

Effect of Al powder content on the properties and microstructure of Y2O3-based ceramic core

Funds: National Natural Science Foundation of China (52265051); Science and technology research project of Jiangxi Provincial Department of Education (GJJ2201118)
  • 摘要: 为获得满足钛合金熔模精密铸造使用的高惰性陶瓷型芯,采用Y2O3作为骨料,引入Al粉作为矿化剂,基于热压注法制备陶瓷型芯。研究了Al粉含量对Y2O3基陶瓷型芯致密化特性、力学性能、微观结构及相组成的影响。结果表明,随Al粉含量增加Y2O3基陶瓷型芯的烧结收缩率和高温挠度逐渐减小;Al粉氧化膨胀有利于抵御型芯的烧结收缩,基于Al粉的液相烧结协同Al-Y2O3的界面反应烧结和Al2O3-Y2O3扩散烧结机制,促进了型芯的致密化。Al粉与基体生成Al2Y4O9晶体抑制了晶间细小Y2O3颗粒的二次烧结,提升了型芯的高温抗变形能力。引入少量Al粉,型芯中生成Al2Y4O9和Y2Al晶体并附着于基体颗粒表面,基于第二相强化晶间结合强度得到提升;加入2wt%Al粉时型芯获得最佳抗弯强度,约为34.38 MPa,相比纯钇基陶瓷型芯提升了49.15%,表现为穿晶断裂。但过量Al粉氧化产生的膨胀量扩大了骨料颗粒间距,一定程度上削弱了晶间结合强度,型芯出现沿晶脆性断裂的倾向,导致承载能力下降。

     

  • 图  1  Y2O3粉料粒度分布

    Figure  1.  Particle size distribution of Y2O3 particles

    图  2  Y2O3基陶瓷型芯烧结温度制度曲线

    Figure  2.  Sintering temperature regime curve of Y2O3-based ceramic core

    图  3  Al粉含量对型芯体积密度和显气孔率的影响

    Figure  3.  Effect of Al powder content on bulk density and apparent porosity of ceramic cores

    图  4  Al粉含量对型芯三维方向烧结收缩率的影响

    Figure  4.  Effect of Al powder content on sintering shrinkage in three-dimensional direction of ceramic cores

    图  5  不同Al粉含量型芯烧结体收缩率的散点图及线性拟合曲线

    Figure  5.  Scatter plot and linear fitting curve of sintering volume shrinkage of ceramic cores with different Al powder content

    图  6  空气气氛下纯Al粉热分析曲线

    Figure  6.  Thermal analysis curve of pure Al powder under air atmosphere

    图  7  Al粉含量对型芯抗弯强度和高温挠度的影响

    Figure  7.  Influence of Al powder content on flexural strength and creep deformation at high temperature of ceramic core

    图  8  不同Al粉含量型芯的位移载荷曲线

    Figure  8.  Displacement load curve of ceramic cores with different Al powder content

    图  9  不同Al粉含量型芯的XRD图谱及局域放大图

    Figure  9.  XRD pattern of Y2O3-based ceramic core with different Al powder content: (a) Full spectrum of XRD; (b) Regional enlargement

    图  10  添加不同Al粉含量的型芯断口形貌SEM图:(a) 0wt%Al粉及局域放大图 (a1)-(a2);(b) 2wt%Al粉及局域放大图(b1)-(b2);(c) 5wt%Al粉及局域放大图(c1)-(c2)

    Figure  10.  SEM image of ceramic cores fracture morphology with different Al powder content. (a) 0wt%Al powder and local magnification map (a1)-(a2);(b) 2wt%Al powder and local magnification map (b1)-(b2); (c) 5wt%Al powder and local magnification (c1)-(c2)

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出版历程
  • 收稿日期:  2023-10-19
  • 修回日期:  2023-11-20
  • 录用日期:  2023-12-02
  • 网络出版日期:  2023-12-20

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