S型B<sub>4</sub>C-SiC/C功能梯度材料的設計和制備

S型B₄C-SiC/C功能梯度材料的設計和制備

摘要: 對(l-x)(80% B₄C-20% SiC)/x C(體積分數)功能梯度材料的x=0.2,0.4,0.6,0.8的各層分別在2000℃,20MPa進行了熱壓,測定了各層的密度,線膨脹系數,彈性模量和抗彎強度等.按線性成分分布函數的6層和11層梯度材料熱壓后都出現了裂紋.采用了不同于冪函數的S型成分分布函數設計,熱壓了11層(x=0.2~1.0)的功能梯度材料,其抗彎強度為216MPa,抗熱震性>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 Δ_fc>500℃ for 11 layers (x=0.2~l) FGMs of S-type.