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硼酸铝晶须增强氰酸酯树脂的性能 总被引:4,自引:0,他引:4
采用硼酸铝(AlBw)晶须改性氰酸酯树脂制备出氰酸酯树脂/晶须复合材料,研究了表面处理和晶须用量对氰酸酯树脂体系的反应活性、复合材料力学性能以及耐湿热性的影响.结果表明,未经表面处理的AlBw晶须不能改善氰酸酯树脂体系的韧性,反而使树脂韧性下降,表面处理的晶须均可以改善树脂的力学性能,经硼酸酯偶联剂处理后的AlBw晶须使树脂体系冲击强度提高.采用硼酸酯偶联剂对AlBw晶须进行表面处理可明显改善晶须在树脂体系中的分散性.在晶须用量低于8%时,随着晶须加入量的增加,树脂体系的力学性能增大,氰酸酯树脂/晶须复合材料表现为韧性断裂并有明显的晶须拔出现象.晶须的加入使树脂体系耐热性和耐湿热性提高,加入8%的AlBw晶须使体系吸水率下降,冲击强度和弯曲强度保持率提高. 相似文献
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本文以硼酸铝晶须为增强剂,以4,5-环氧环己烷-1,2-二甲酸二缩水甘油酯(TDE-85),甲基纳狄克酸酐(MNA)、N,N’-二胺基二苯甲烷型双马来酰亚胺(BMI)/O,O′-二烯丙基双酚A(BA)体系分别作为基体制备晶须增强复合材料。研究了晶须对树脂的尺寸、表面处理方法、含量对树脂体系力学性能和热性能的影响;通过扫描电子显微镜(SEM)分析了浇注体的弯曲、冲击断口,研究晶须的增强机理。 相似文献
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钛酸钾晶须增强双马来酰亚胺树脂体系的研究 总被引:7,自引:0,他引:7
以钛酸钾晶须(TKw)为增强剂,以N,N'-二胺基二苯甲烷型双马来酰亚胺(BMI)/O,O'-二烯丙基双酚A(BA)树脂作为基体,制备了晶须增强热固性树脂基体复合材料.研究了晶须对树脂体系凝胶特性的影响,同时利用红外光谱分析研究了晶须对体系固化反应性的影响;考察了晶须的表面处理方法、含量及复合工艺对树脂体系力学性能和热性能的影响;通过扫描电子显微镜(SEM)分析了材料的弯曲及冲击断口形貌.研究结果表明,在晶须添加质量分数约为15%左右,所制备的复合材料的综合性能较佳. 相似文献
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概述了钛酸钾、氧化锌、硼酸铝等陶瓷晶须增强聚合物基复合材料的研究进展,探讨了晶须含量、晶须表面处理、材料前处理方法等对提高复合材料力学性能及摩擦学性能的影响,明确了适当的表面改性方法可以使晶须的增强效果更为明显,指出了在晶须/聚合物结合面微观形态观察和分析方面的不足,提出了构建晶须/聚合物复合材料的理论模型、预测复合材料性能的研究方向. 相似文献
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以CaSO4晶须/纳米TiO2为添加剂制备了CaSO4晶须/纳米TiO2/PP-R树脂复合材料,并研究了紫外辐射对复合材料力学性能的影响.结果表明:经7%的KH550偶联剂改性后的CaSO4晶须具有较好的分散性能,经6%的KH570偶联剂改性后的纳米TiO2具有较好的分散性能;与纯PP-R相比,CaSO4晶须添加量为5%时,复合材料的性能有较大的提高,其热变形温度由72.03℃提高到104.78℃,断裂伸长率也由45.32%提高到122.27%;添加纳米TiO2对CaSO4晶须/PP-R树脂的耐热性能和力学性能没有明显的影响,但却能大幅度增强复合材料的抗菌性能及紫外老化性能. 相似文献
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使用溶胶2凝胶法在硼酸铝晶须表面制备 ZnAl 2O 4涂层 , 采用挤压铸造法制备了 ZnAl 2O 4涂覆的硼酸铝晶须增强 6061Al 复合材料。研究了 ZnAl 2O 4涂覆对复合材料界面润湿性、 室温拉伸性能以及高温热暴露后界面热稳定性的影响。试验结果表明: 纳米 ZnAl 2O 4涂覆能够明显提高复合材料的界面润湿性 , 从而提高复合材料的室温拉伸性能; 均匀的 ZnAl 2O 4涂覆能有效地阻碍界面反应 , 使复合材料具有良好的热稳定性能。研究了涂覆对复合材料在铸态及高温热暴露后拉伸断裂行为的影响。未涂覆硼酸铝晶须增强的铝基复合材料在拉伸变形过程中晶须以折断为主 , ZnAl 2O 4涂覆硼酸铝晶须增强的铝基复合材料在拉伸变形过程中晶须以拔出为主。 相似文献
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S. Kohara 《Materials and Manufacturing Processes》1990,5(1):51-62
Liquid phase fabrication methods for aluminum matrix composites reinforced with SiC whiskers, or SiC particles have been investigated and the mechanical properties of fabricated composites have been evaluated. Three kinds of liquid phase fabrication methods; hot extrusion, hot pressing and pressure infiltration, were studied. Commercial SiC whiskers and SiC powders of alpha type and beta type were used as the reinforcements for an aluminum matrix. Among the fabrication methods investigated, the best results were achieved by the pressure infiltration. The mechanical properties and the wear resistance of the fabricated composites were measured. The SiC whisker reinforced aluminum matrix composites have high strength, so that they can be used as high specific strength materials. The SiC particulate reinforced aluminum matrix composites are not strong as the SiC whisker reinforced composites. However, the SiC particulate reinforced aluminum matrix composites have a good potential for use as wear resistant material. The hardening effect of beta type particles on the aluminum matrix was larger than that of alpha type particles. 相似文献
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A alumina borate whisker with Bi(OH)3 coating was prepared by a chemical method. The coated whiskers were sintered at various temperatures. The coated whisker-reinforced pure aluminum matrix composite was fabricated by squeeze casting method. The microstructures of the coated whiskers and coated composites with the different sintering temperature of whisker preform were studied, and the tensile properties of the coated composites at room temperature were also investigated. It can be found that the microstructures of coatings on the whisker surfaces and at the interface in the coated composites are strongly dependent on the sintering temperature of whisker preform. The ultimate tensile strength and elongation to fracture of the coated composites increased with the increasing of sintering temperature of the whisker preform. 相似文献
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F. Ye Y. Zhou T. C. Lei J. M. Yang W. C. Zhou L. T. Zhang 《Journal of Materials Science》2001,36(1):237-240
20vol%SiCw/BAS (barium aluminosilicate) composites with as-received, acid-leached and heat-treated whiskers were fabricated by a hot-pressing technique and their mechanical properties were evaluated. The whiskers used in these composites were characterized using Auger electron spectrometry (AES) and scanning electron microscopy (SEM), and the observations were correlated with the mechanical properties. The results show that the oxygen content of the whisker surfaces was reduced by the hydrogen fluoride (HF) acid-leaching treatment and the surface geometry of whiskers was smoothed by the heat-treatment in an inert gas atmosphere. The corresponding composites show an obvious increase (18% and 31%, respectively) in toughness compared with the composites reinforced with as-received whiskers. Fracture surfaces revealed evidence of toughening by the mechanisms of crack deflection, crack bridging and whisker pullout for the composites with surface treated whiskers. 相似文献
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Process optimization of Al/SiC metal matrix composites is described through a wet blending technique that effectively disperses SiC whiskers in an aluminum matrix. Whisker dispersion and protection are aided by a sol-gel interphase applied to the whiskers prior to matrix blending. Following the blending and PM processing, i.e. compaction and extrusion, the composite is examined by SEM. Improved thermal properties have been achieved as a result of the sol-gel interphase and are verified by DTA and SEM studies. The mechanical properties, including fracture surface examination, of the Al/SiC composites are tested for wet blended samples containing either coated or uncoated whiskers. Additionally, the results of this study are compared to similar Al-SiC composites processes by standard dry blending procedures. 相似文献