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首页> 外文期刊>Materials Science and Engineering >An investigation on mechanical properties of Alumina-Zirconia-Magnesia spinel composite ceramics fabricated by gel-casting using solution combustion synthesized powder
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An investigation on mechanical properties of Alumina-Zirconia-Magnesia spinel composite ceramics fabricated by gel-casting using solution combustion synthesized powder

机译：固溶燃烧合成粉末凝胶浇铸制备氧化铝-氧化锆-氧化镁尖晶石复合陶瓷的力学性能研究

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摘要

Addition of spinel (MgAl_2O_4) to Al_2O_3-ZrO_2 composite inhibits alumina grain growth and produces phase boundaries that leads to formation of a ceramic matrix composite with special mechanical properties such as high temperature superplastic deformation. However, the room temperature mechanical properties of Alumina-zirconia-magnesia spinel composite (AZM) such as fracture toughness were rarely investigated by researchers. In this research the AZM nanocomposite powders were synthesized via the solution combustion method. The dense AZM composite samples were fabricated through gelcasting process. Phase analysis studies were performed on both powder and sintered samples and the effects of spinel and zirconia contents on mechanical properties as well as microstructure of AZM composite samples were investigated. The maximum Vickers hardness (18.83 +1.86 GPa) and flexural strength (563.74 + 23.38 MPa) were achieved in the sample with 10 vol% spinel and 10 vol% zirconia. The sample with 10vol% spinel and 20vol% zirconia had the maximum fracture toughness (6.67 ± 0.81 MPam~(1/2).
机译：将尖晶石（MgAl_2O_4）添加到Al_2O_3-ZrO_2复合物中会抑制氧化铝晶粒的生长并产生相界，从而导致形成具有特殊机械性能（例如高温超塑性变形）的陶瓷基复合材料。然而，研究人员很少研究氧化铝-氧化锆-镁尖晶石复合材料（AZM）的室温力学性能，例如断裂韧性。在这项研究中，通过溶液燃烧法合成了AZM纳米复合粉末。通过凝胶浇铸工艺制备了致密的AZM复合材料样品。对粉末和烧结样品进行了相分析研究，并研究了尖晶石和氧化锆含量对AZM复合样品的力学性能以及微观结构的影响。在含有10％（体积）尖晶石和10％（体积）氧化锆的样品中，获得了最大的维氏硬度（18.83 +1.86 GPa）和抗弯强度（563.74 + 23.38 MPa）。尖晶石含量为10vol％，氧化锆含量为20vol％的样品的断裂韧性最大（6.67±0.81 MPam〜（1/2））。

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