高级检索

CaO–Al2O3–SiO2复合烧结助剂添加量对ZrO2/Al2O3复相陶瓷性能的影响

Effect of addition contents of CaO–Al2O3–SiO2 composite sintering aids on the properties of ZrO2/Al2O3 composite ceramics

    摘要
  • 摘要: 以Al(NO3)3·9H2O、Ca(NO)2·4H2O、C8H20O4Si为原料, 采用高分子网络法制备出成分均匀、粒度分布为3~7μm、高活性的CaO–Al2O3–SiO2复合烧结助剂; 将质量分数为3%、5%、7%、9%的CaO–Al2O3–SiO2复合烧结助剂添加到Al2O3和ZrO2原料粉体中, 经干压成型, 在1450℃烧结温度、保温4h的工艺条件下进行常压烧结制备得到ZrO2/Al2O3复相陶瓷试样, 研究烧结助剂添加量对复相陶瓷力学性能和显微组织结构的影响。结果表明:当添加质量分数为5%的CaO–Al2O3–SiO2复合烧结助剂时, ZrO2/Al2O3复相陶瓷的综合性能最达到佳, 相对密度为94%, 显微维氏硬度为1204 MPa, 抗弯强度为321 MPa, 断裂韧性为4.52 MPa·m1/2。

     

    Abstract: The CaO–Al2O3–SiO2 composite sintering aids were prepared by polymer network method using Al(NO3)3·9H2O, Ca (NO) 2·4 H2O, and C8H20O4Si as the raw materials, showing the uniform constituent and high activity in the particle sizes of 3~7 μm.The Al2O3 and ZrO2 raw powders were mixed and dry pressed with the CaO–Al2O3–SiO2 composite sintering aids in the mass fraction of 3%, 5%, 7%, and 9%, and then the ZrO2/Al2O3 composite ceramics samples were pressureless sintered at 1450 ℃ for 4 h.The effect of addition contents of CaO–Al2O3–SiO2 composite sintering aids on the mechanical properties and microstructures of ZrO2/Al2O3 composite ceramics were studied.The results show that, the comprehensive properties of ZrO2/Al2O3 composite ceramics added with the CaO–Al2O3–SiO2 composite sintering aids in the mass fraction of 5% are the optimal as the relative density of 94%, the micro-Vickers hardness of 1204 MPa, the flexural strength of 321 MPa, and the fracture toughness of 4.52 MPa·m1/2.

     

    • HTML全文
    • 参考文献(17)
    • 相关文章
    • 施引文献
  • 资源附件(0)

/

返回文章
返回