Lamellar-interpenetrated Al–Si–Mg/SiC composites fabricated by freeze casting and pressureless infiltration
Lamellar-interpenetrated Al–Si–Mg/SiC composites fabricated by freeze casting and pressureless infiltration
复制标题
DOI：
10.1016/j.msea.2015.02.012
复制
发表时间：
2015-04
期刊：
影响因子：
6.4
通讯作者：
Alateng Shaga;P. Shen;Chang Sun;Q. Jiang
中科院分区：
文献类型：
--
作者：
Alateng Shaga;P. Shen;Chang Sun;Q. Jiang
采用冷冻铸造法制备了初始固体含量为20-40 vol%的多孔层状SiC支架，然后在空气中于1200 °C烧结2 h，形成SiO2层。随后，在N2气氛中用Al-12wt%Si-10wt%Mg合金对预制件进行无压渗透，在复合材料中形成层状互穿结构。所得复合材料进行了研究，通过压缩试验和超声脉冲回波测量在纵向和横向方向，表现出弱正交各向异性性能。SiC含量为30 vol%时，复合材料的纵向抗压强度最高（722±35 MPa），弹性模量最大（163 GPa）。
Porous laminated SiC scaffolds with initial solid loadings of 20–40 vol% were prepared by freeze casting and then sintered at 1200 °C for 2 h in air to produce a SiO2layer. Subsequently, the preforms were pressureless-infiltrated by an Al–12 wt% Si–10 wt% Mg alloy in a N2atmosphere, forming a lamellar-interpenetrated structure in the composites. The resultant composites were investigated by compression tests and ultrasonic pulse echo measurements in the longitudinal and transverse directions, exhibiting weak orthotropic properties. The highest compressive strength (722±35 MPa) was achieved in the samples with 30 vol% SiC in a longitudinal direction and the largest elastic modulus (163 GPa) was exhibited in the 40 vol% SiC composites.