热处理及浆料对Nextel 720纤维强度及其分布的影响

Influence of Heat-Treatment and Slurry on Strength and Distribution of Nextel 720 Fiber

采用两参数Weibull分布,对Nextel 720纤维强度及其分布进行了研究,并采用Kolmogorov非参数检验对其分布进行了检验。采用液相浸渍(硅溶胶、石英浆料和氮化硅浆料)对Nextel 720纤维进行处理,研究其对Nextel720纤维强度的影响。结果表明,可用两参数Weibull分布表征纤维束强度分布。热处理使纤维强度急剧下降,且强度分散性变大。上浆后800℃处理,纤维束强度较高,Weibull模数高于原始纤维束;1000℃处理后,温度对纤维束的损伤严重,强度较低,但比不上浆相同温度处理纤维束强度高,分散性小。

With two parameter Weibull distribution, the strength distribution of Nextel 720 fiber was investigated. And the fitness of the strength distribution was also conducted by the Kolmogorov test. With slurry infiltration, including silica sol, silica slurry and silicon nitride slurry, the influence of different slurry on the strength and distribution of Nextel 720 fiber were studied. Meanwhile, the influence of heat treatment was also performed. The results show that two parameter Weibull distributions can be used to present the strength distribution of Nextel 720 fiber. It also suggesting that the strength of the fiber decrease sharply after heat treated, and decentrality of the strength is increased. Infiltrated with slurry and heat-treated at the temperature of 800℃ , the strength of the fiber are much higher, and the Weibull modulus of the fibers are bigger than that of the as-received fiber tows. While treated at the temperature of 1000℃ , the strength of the fiber tows are much lower due to the damage at higher treatment temperature. But the strength are still higher than that of the fiber tows＇ treated at same temperature without slurry, and the decentrality are also decreased.