| 引用本文: | 边立平,邢素丽,尹昌平.酚醛-石英混杂纤维增强苯并噁嗪复合材料高温失效特征.[J].国防科技大学学报,2020,42(3):97-101.[点击复制] |
| BIAN Liping,XING Suli,YIN Changping.High-temperature failure characteristics of phenolic-quartz hybrid fabrics reinforced benzoxazine composites[J].Journal of National University of Defense Technology,2020,42(3):97-101[点击复制] |
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| 酚醛-石英混杂纤维增强苯并噁嗪复合材料高温失效特征 |
| 边立平1,邢素丽2,尹昌平2 |
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(1. 环境医学与作业医学研究所, 天津 300050;2. 国防科技大学 空天科学学院, 湖南 长沙 410073)
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| 摘要: |
| 通过模压工艺制备了酚醛-石英混织纤维增强苯并噁嗪复合材料(P-Q/BZ)试样,考察了其力学性能、烧蚀性能和耐冲刷性能,分析了该试样在高温环境中的主要失效特征,研究其在高温环境中的适用性。结果表明,未经热处理的P-Q/BZ试样平均弯曲强度、弯曲模量和层间剪切强度分别为283 MPa、10.8 GPa和22.6 MPa；经300 ℃,N2处理15 min后,试样均匀膨胀,厚度增加22%,弯曲强度、弯曲模量和层间剪切强度分别下降58%、41%和58%；在氧乙炔焰的平均质量烧蚀率和线烧蚀率分别为0.048 4 g/s和-0.081 mm/s,烧蚀后试样宏观不分层,表面炭层微观分层严重,酚醛纤维热解炭、树脂基体热解炭、熔融石英纤维以及碳硅氧化产物相互分离；该试样耐冲刷能力差,在发动机尾焰烧蚀平台模拟的热-力耦合环境中的质量损失率高达59%。P-Q/BZ复合材料需要解决热解膨胀问题,进一步提高抗冲刷性能。 |
| 关键词: 苯并噁嗪 混杂纤维 弯曲性能 耐烧蚀性能 耐冲刷性能 |
| DOI：10.11887/j.cn.202003012 |
| 投稿日期：2018-11-29 |
| 基金项目:国家自然科学基金资助项目(51403235) |
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| High-temperature failure characteristics of phenolic-quartz hybrid fabrics reinforced benzoxazine composites |
| BIAN Liping1, XING Suli2, YIN Changping2 |
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(1. Institute of Environmental and Operational Medicine, Tianjin 300050, China;2. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| P-Q/BZ(Phenolic-quartz hybrid fabrics reinforced benzoxazine resin composites) were manufactured by compression molding. The flexural properties, ablative properties, resistance to flow erosion and failure characteristics of the P-Q/BZ specimens were investigated. The applicability of P-Q/BZ in high temperature environment was studied. Results showed that, the average flexural strength, flexural modulus and ILSS (interlaminar shear stress) of virginal P-Q/BZ specimens were 283 MPa, 10.8 GPa and 22.6 MPa, respectively. After 300 ℃ thermal treatment in N2 atmospheres:the thickness of P-Q/BZ specimens were increased by about 22%, and the flexural strength, flexural modulus and ILSS of P-Q/BZ specimens were decreased by about 58%, 41% and 58%, respectively. After the oxyacetylene flame test, the average mass loss rate and the linear ablative rate of P-Q/BZ specimens were 0.048 4 g/s and -0.081 mm/s, respectively. No delamination of the P-Q/BZ composites were observed but the microstructure of the char layer delaminated severely, the carbonaceous residue blocks which were produced by the phenolic fiber and the resin matrix were attached badly to the quartz fibers. The resistance to heat-flow erosion of the P-Q/BZ specimen was significantly affected, and the mass loss of the P-Q/BZ composite was about 59% after the exhaust plume ablative test with a small liquid motor. Pyrolysis expansion problem of the P-Q/BZ composites is in need of a solution and the resistance to heat-flow erosion of this composites is in demand of improvement as well. |
| Keywords: benzoxazine hybrid fabric flexural properties ablation property resistance to heat-flow erosion |
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