Lamellar-interpenetrated Al-Si Mg/Al2O3-ZrO2 composites prepared by freeze casting and pressureless infiltration
Lamellar-interpenetrated Al-Si Mg/Al2O3-ZrO2 composites prepared by freeze casting and pressureless infiltration
复制标题
冷冻铸造和无压渗透制备层状互穿Al-Si Mg/Al2O3-ZrO2复合材料
DOI：
10.1016/j.ceramint.2016.11.162
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发表时间：
2017
影响因子：
5.2
通讯作者：
Jiang Qi-Chuan
中科院分区：
文献类型：
--
作者：
Guo Rui-Fen;Lv Hao-Chen;Shen Ping;Hu Zhi-Jie;Jiang Qi-Chuan
采用冷冻铸造和无压浸渗法制备了初始陶瓷含量为30vol%、不同Al 2 O3：ZrO 2重量比（Al 2 O3：ZrO 2 =1：9，3：7，5：5，7：3和9：1）的层状Al-Si-Mg/Al 2 O3-ZrO 2复合材料。所得复合材料继承了Al 2 O3 − ZrO 2支架的层状结构，金属层和陶瓷层的厚度均随Al 2 O3含量的增加呈现先增加后减小的趋势。在无压浸渗过程中，ZrO 2与Al− 12 Si − 10 Mg合金发生了多种化学反应，主要反应产物为（Al 1 −m，Sim）3 Zr、Al 2 O3和ZrSi 2相。反应的程度取决于陶瓷组合物中ZrO 2的含量。随着Al 2 O3含量的增加，复合材料的抗压强度总体上呈下降趋势，而三点弯曲强度则呈现先下降后上升的趋势。当Al 2 O3：ZrO 2 =1：9时，复合材料的压缩强度和弯曲强度分别达到997±60 MPa和426±10 MPa。提出了一个简单的模型来描述复合材料的断裂模式和增韧机理。
Using freeze casting and pressureless infiltration methods, we prepared lamellar Al−Si−Mg/Al2O3−ZrO2composites with initial ceramic loading of 30 vol% and different Al2O3:ZrO2weight ratios (Al2O3:ZrO2=1:9, 3:7, 5:5, 7:3 and 9:1). The resultant composites inherited the lamellar structure of the Al2O3−ZrO2scaffolds, and the thickness of both metal and ceramic layers showed a trend of first increase and then decrease with increasing Al2O3content. During pressureless infiltration, multiple chemical reactions took place between ZrO2and the Al−12Si−10Mg alloy and the main reaction products were (Al1−m, Sim)3Zr, Al2O3and ZrSi2phases. The degree of the reaction depended on the ZrO2content in the ceramic composition. In general, the compressive strength of the composites decreased with increasing Al2O3content, but three-point bending strength showed a first decrease and then increase. When Al2O3:ZrO2=1:9, the compressive and bending strength of the composites reached about 997±60 MPa and 426±10 MPa, respectively. A simple model was proposed to illustrate the fracture mode and toughening mechanism of the composites.