Squeeze Infiltration Processing of Functionally Graded Aluminum–SiC Metal Ceramic Composites
Squeeze Infiltration Processing of Functionally Graded Aluminum–SiC Metal Ceramic Composites
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DOI：
10.1007/s12666-012-0170-5
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发表时间：
2012-09
影响因子：
1.6
通讯作者：
K. M. Sree Manu;V. G. Resmi;M. Brahmakumar;P. Narayanasamy;T. Rajan;C. Pavithran;B. C. Pai
中科院分区：
文献类型：
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作者：
K. M. Sree Manu;V. G. Resmi;M. Brahmakumar;P. Narayanasamy;T. Rajan;C. Pavithran;B. C. Pai
采用无机致孔剂法制备SiC梯度多孔预制体，通过直接挤压浸渗6061铝合金制备SiC/Al功能梯度复合材料。通过改变无机盐混合物的浓度，以Al为粘结剂，合成了SiC梯度预制体。显微组织分析表明，SiC颗粒呈梯度分布，熔体已完全渗透到预制体中，形成了功能梯度材料。预制坯和模具温度、液态金属温度、挤压压力及其施加速率对复合材料的凝固组织和性能有重要影响。采用SEM、光学显微镜和XRD对大孔梯度SiC预制体和复合材料进行了表征。主要的界面反应产物是MgAl 2 O 4尖晶石，这有助于形成良好的界面结合。
The objective of the present work is on fabrication of functionally graded SiC/Al composite by direct squeeze infiltration of 6061 aluminum alloy using graded SiC porous preform prepared by inorganic porogen technique. Graded SiC preform is synthesized by varying the concentration of inorganic salt mixture and using Al as the binder. The microstructure analysis indicates the graded distribution of SiC particle and the melt has infiltrated completely throughout the preform to form functionally graded materials. The influence of preform and mold temperature, liquid metal superheat, squeeze pressure, and its rate of application plays major role on solidification microstructures and properties of the composites. The macro porous graded SiC preforms and the composites were characterized using SEM, optical microscopy, and XRD. The major interfacial reaction product is MgAl2O4spinel which helps in formation of good interface bonding.