S型B4C-SiC/C功能梯度材料的设计和制备
Design and Fabrication of S-Type B4C-SiC/C Functionally Graded Materials
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摘要: 对(l-x)(80% B4C-20% SiC)/x C(体积分数)功能梯度材料的x=0.2,0.4,0.6,0.8的各层分别在2000℃,20MPa进行了热压,测定了各层的密度,线膨胀系数,弹性模量和抗弯强度等.按线性成分分布函数的6层和11层梯度材料热压后都出现了裂纹.采用了不同于幂函数的S型成分分布函数设计,热压了11层(x=0.2~1.0)的功能梯度材料,其抗弯强度为216MPa,抗热震性>500℃.Abstract: The x=0.2,0.4,0.6,80 layers of (l -x) (80%B4C-20%SiC)/xC (volume fraction) Functionally Graded Materials were hot-pressed respectively. The density, linear thermal expansion, elastic modulus and flexural strength were tested. There are crackles in FGMs of 6 and 11 layers that are designed by linear function. The S-type function of compositional distribution as a designed method applied to investigate FGM. As a result the flexural strength is 216 MPa and thermal shock resistance Δfc>500℃ for 11 layers (x=0.2~l) FGMs of S-type.
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