不同粒度莫来石粉改性硅基陶瓷型芯的制备及性能

吴笑非 李鑫 许西庆 牛书鑫 范红娜 杨小薇

吴笑非, 李鑫, 许西庆, 牛书鑫, 范红娜, 杨小薇. 不同粒度莫来石粉改性硅基陶瓷型芯的制备及性能[J]. 航空材料学报, 2021, 41(4): 128-133. doi: 10.11868/j.issn.1005-5053.2021.000074
引用本文: 吴笑非, 李鑫, 许西庆, 牛书鑫, 范红娜, 杨小薇. 不同粒度莫来石粉改性硅基陶瓷型芯的制备及性能[J]. 航空材料学报, 2021, 41(4): 128-133. doi: 10.11868/j.issn.1005-5053.2021.000074
WU Xiaofei, LI Xin, XU Xiqing, NIU Shuxin, FAN Hongna, YANG Xiaowei. Fabrication and properties of silica-based ceramic cores modified by mullite powders with different particle sizes[J]. Journal of Aeronautical Materials, 2021, 41(4): 128-133. doi: 10.11868/j.issn.1005-5053.2021.000074
Citation: WU Xiaofei, LI Xin, XU Xiqing, NIU Shuxin, FAN Hongna, YANG Xiaowei. Fabrication and properties of silica-based ceramic cores modified by mullite powders with different particle sizes[J]. Journal of Aeronautical Materials, 2021, 41(4): 128-133. doi: 10.11868/j.issn.1005-5053.2021.000074

不同粒度莫来石粉改性硅基陶瓷型芯的制备及性能

doi: 10.11868/j.issn.1005-5053.2021.000074
详细信息
    通讯作者:

    许西庆(1990—),男,博士,主要从事结构陶瓷、增材制造,联系地址:长安大学材料学院(710061),E-mail:xiqingxu@chd.edu.cn

  • 中图分类号: TQ174.4

Fabrication and properties of silica-based ceramic cores modified by mullite powders with different particle sizes

  • 摘要: 陶瓷型芯在航空发动机空心涡轮叶片的熔模精密铸造中提供复杂内腔结构。采用不同粒径的电熔莫来石粉作为添加剂,利用热压注法制备氧化硅/莫来石陶瓷型芯,研究莫来石粒径对型芯析晶行为和性能的影响。结果表明:莫来石粉的加入促进方石英的析晶,较细莫来石对不均匀形核的促进更加明显,会产生更多的方石英晶相;粒径过大的莫来石粉会导致型芯烧结程度低,力学性能和抗蠕变能力较差;当莫来石粉的粒径过小时,型芯内含有过多的方石英晶相,冷却中相变产生微裂纹,也会引起室温强度和抗高温变形能力恶化;莫来石粒径为19 μm的陶瓷型芯表现出良好的综合性能:线收缩率为0.65%,气孔率为31.8%,室温弯曲强度为17.8 MPa,1540 ℃的蠕变为0.4 mm,溶蚀率为0.06 g/min。

     

  • 图  1  不同粒径莫来石粉的SEM图

    Figure  1.  SEM images of mullite powders with different particle sizes(a)5 μm;(b)19 μm;(c)40 μm

    图  2  不同陶瓷型芯的XRD谱图

    Figure  2.  XRD patterns recorded from different ceramic cores

    图  3  不同粒径莫来石粉制备的陶瓷型芯的SEM图

    Figure  3.  SEM images of the ceramic cores modified by mullite mineralizers with different particle sizes (a)M5;(b)M19;(c)M40

    图  4  不同陶瓷型芯的线收缩率和气孔率

    Figure  4.  Linear shrinkage and porosity of different ceramic cores

    图  5  不同陶瓷型芯的室温弯曲强度和高温蠕变

    Figure  5.  Room temperature bending strength and high temperature creep deformation of different ceramic cores

    图  6  不同陶瓷型芯在35%KOH沸腾水溶液中的溶蚀率

    Figure  6.  Leaching rate of different ceramic cores in boiling 35%KOH

    表  1  实验原料

    Table  1.   Experimental material

    MaterialChemical formulaPurityMean particle size/μm
    Fused silica powdersSiO2 > 99.95%30
    Fused mullite powders3Al2O3·2SiO2 > 95% 5
    Fused mullite powders3Al2O3·2SiO2 > 95%19
    Fused mullite powders3Al2O3·2SiO2 > 95%40
    下载: 导出CSV

    表  2  莫来石粉体的成分(质量分数/%)

    Table  2.   Composition of the mullite powder(mass fraction/%)

    Al2O3SiO2Na2OK2OFe2O3CaOMgO
    Bal20.40.240.170.110.16 < 0.1
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-04-30
  • 修回日期:  2021-05-24
  • 网络出版日期:  2021-08-26
  • 刊出日期:  2021-08-01

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