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Sialon—BN系复合材料的特性及其应用 总被引:1,自引:0,他引:1
Sialon是一种机械性能及抗熔融金属浸蚀性较好的材料,但抗热震性较差。BN陶瓷具有出色的抗热震性能。因此,过去进行了研究,开发了一种改善抗热震性能的Sialon-BN复合材料。本文叙述了具有良好性能(如800℃以上的抗热震性,以及在1550℃以上的抗熔融金属浸蚀性能和热稳定性)的致密Sialon-BN(含CaO)复合材料的开发。 相似文献
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3Y-ZrO2/Fe3Al复合材料的抗热震性能 总被引:1,自引:1,他引:1
采用残余强度法测试了单相3Y—ZrO2及3Y—ZrO2/Fe3Al复合材料的抗热震性能,并用诸抗热震参数(R,R'和R"')分析了抗热震性能与材料热力学性能参数之间的关系,同时分析了R阻力曲线与抗热震性能之间的相关性。结果表明:由于相变增韧与桥联增韧的协同作用,复合材料断裂韧性的明显提高,从而使临界热震温差△θc由单相3Y—ZrO2的220℃提高至3Y—ZrO2/30%(in volume)Fe3Al复合材料的450℃。R曲线中韧性初始值K0的升高预示着启动裂纹生长的能量的增大,对应于热震作用下裂纹成核能的提高及△θc的增大。R曲线愈陡,热震作用下裂纹扩展受到的阻力越大,材料的抗热震损伤能力越好。 相似文献
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以玻璃纤维多轴向经编针织物为增强体,以环氧树脂为基体,将玻璃短纤维添加到玻纤织物增强体层之间,制备层间含有玻璃短纤维的多层多轴向经编复合材料。利用万能力学材料试验机对复合材料的层间撕裂性能进行测试和电镜扫描,对撕裂后的复合材料层间形态进行了观察,研究了玻璃短纤维对复合材料层间性能的影响。结果表明,玻璃短纤维增韧处理的复合材料层间撕裂性能明显增强,载荷-位移曲线初始斜率大,复合材料不易被以撕裂形式为主的载荷破坏。 相似文献
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A novel process has been developed to manufacture poly(methyl methacrylate) (PMMA) pultruded parts. The mechanical and dynamic mechanical properties, environmental effects, postformability of pultruded composites and properties of various fiber (glass, carbon and Kevlar 49 aramid fiber) reinforced PMMA composites have been studied. Results show that the mechanical and thermal properties (i.e. tensile strength, flexural strength and modulus, impact strength and HDT) increase with fiber content. Kevlar fiber/PMMA composites possess the highest impact strength and HDT, while carbon fiber/PMMA composites show the highest tensile strength, tensile and flexural modulus, and glass fiber/PMMA composites show the highest flexural strength. Experimental tensile strengths of all composites except carbon fiber/PMMA composites follow the rule of mixtures. The deviation of carbon fiber/PMMA composite is due to the fiber breakage during processing. Pultruded glass fiber reinforced PMMA composites exhibit good weather resistance. They can be postformed by thermoforming, and mechanical properties can be improved by postforming. The dynamic shear storage modulus (G′) of pultruded glass fiber reinforced PMMA composites increased with decreasing pulling rate, and G′ was higher than that of pultruded Nylon 6 and polyester composites. 相似文献
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To fully exploit the abundant bioresource crop straw, a straw-based composite with excellent fire retardant, high strength and dimensional stability was successfully prepared for use in building applications. The subject composite was composed of rice straw/magnesium cement (SMC) adhesive, with glass fiber as a reinforcement agent. The mechanical strength, dimensional stability, flame retardant, smoke suppression, and thermal stability of the material were used to evaluate its performance as a potential construction material. The effect of the addition of glass fiber and the pavement structure of straw and glass fiber were also characterized. The experimental results showed that the mechanical strength and rigidity of SMC composite were increased by the addition of 9% glass fiber to the total mass of the filler. Glass fibers reinforced and reduced the volume of the filler, while increasing the dimensional stability of the composites. The strength of the mixed structural composites was higher than layered structural composites, which is benefits the preparation of the composites. Compared to other straw/cement composites, glass-fiber reinforced SMC composites exhibited better strength, dimensional stability, flame retardant, smoke suppression and thermal stability. These superb properties make these novel composites an ideal candidate for use in the field of interior decoration, particularly in public venues. 相似文献
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研究了不同燃气流作用时间对玻璃钢层间剪切强度的影响。研究结果表明:随着燃气流作用时间的延长,玻璃钢表面碳化失效层数呈增加趋势;未烧蚀部分复合材料层间剪切强度虽有降低,但是降低幅度不大,说明表面的玻璃布层碳化失效对深层复合材料层间剪切强度影响不大;烧蚀后复合材料断裂模式由韧性转变为脆性。该研究结果为玻璃钢在燃气流环境中的应用提供了重要的数据支撑。 相似文献
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制备了高模量树脂基单向复合材料,测试了单向复合材料的纵向压缩性能和平面剪切性能。研究了基体模量对单向复合材料抗压强度及复合材料平面剪切性能的影响,结果表明:单向复合材料的抗压强度与基体模量成线性比例关系,随基体模量的提高而提高,复合材料的平面剪切性能与基体模量基本上呈线性关系,平面剪切强度亦随基体模量的提高而提高。以模量达5.36GPa的环氧树脂作为复合材料的树脂基体制备的,单向玻璃纤维增强复合材料其抗压强度高达1.295GPa,碳纤维增强的复合材料抗压强度高达1.372GPa,与普通环氧树脂的单向复合材料相比,分别提高了55%和45.8%;复合材料的平面剪切强度达64.5MPa,比普通环氧树脂复合材料的平面剪切强度提高了44.3%,满足了深潜壳体对复合材料抗压强度的要求。 相似文献
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玻纤增强PP热塑性片材的制备及力学性能研究 总被引:1,自引:0,他引:1
采用熔融浸渍法制备了玻璃纤维毡增强聚丙烯(PP)热塑性复合片材;通过在PP中加入复合改性PP改善了基体与增强纤维间的相容性;考察了相容剂、PP种类及玻纤毡种类对复合片材的影响。结果表明,相容剂的加入可使复合片材的拉伸强度提高29%、拉伸模量提高23%、弯曲强度提高42%、弯曲模量提高25%;高熔体质量流动速率PP可使片材的弯曲与冲击性能进一步改善。连续玻纤毡和长玻纤毡增强PP复合片材,前者综合力学性能良好,而后者则冲击强度较弱、弯曲性能加强。 相似文献