在1500℃,10<'-4>Pa真空中,采用应力比0.1和0.5,频率60Hz和20Hz的正弦波对三维编织炭纤维增强碳化硅基复合材料(3D-C<,f>/SiC)进行了拉-拉疲劳实验,利用SEM和HRTEM分别观察了疲劳试样的断口形貌和热解炭界面相的微结构.结果表明:若取循环基数为10<'6>次,当应力比为0.1时,20Hz和60Hz的疲劳极限分别是230MPa和240MPa,约为抗拉强度的88%和92%;当应力比为0.5时,60Hz的疲劳极限是230MPa,约为抗拉强度的88%.应力比低、加载频率高、循环周次多的断口粗糙度大,纤维(束)拔出较长.纳米尺度的热解炭界面相变形明显,由平直状变为卷曲状.
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