共查询到19条相似文献,搜索用时 109 毫秒
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聚合物增韧增强机理研究进展 总被引:6,自引:0,他引:6
总结了橡胶增韧塑料机理,讨论了橡胶粒子形态,结构等因素对增韧效果的影响。介绍了近年来出现的刚性有机填料(ROF)增韧塑料的基本概念及冷拉机理。讨论了无机刚性粒子填充聚合物的增强、增韧与粒子的分散及界面的关系。 相似文献
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聚合物增韧机理的研究进展 总被引:1,自引:0,他引:1
总结了橡胶增韧塑料机理,讨论了橡胶粒子形态,结构等因素对增韧效果的影响。介绍了近年来出现的刚性有机填料(ROF)增韧塑料的基本概念及冷拉机理。对无机刚性料子填充聚合物的增强及增韧与粒子的分散及界面的关系进行了讨论。 相似文献
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综述了近些年来无机刚性粒子增韧聚丙烯(PP)的结构设计、刚性粒子粒径及其分布、改性剂种类及用量对增韧增强效果的影响以及无机刚性粒子增韧PP的机理。大量的研究表明,在刚性粒子增韧PP中,弹性体包覆刚性粒子的壳一核结构设计具有优异的增韧效果。在定量分析PP增韧机理方面,介绍了脆韧转变分析中界面黏结判据和粒间距判据,以及有限元方法在此领域的应用,刚性粒子增韧机理主要为界面脱黏到空洞/银纹化损伤和空洞/剪切屈服损伤的转变。此外还介绍了目前刚性粒子与橡胶混杂增韧PP的研究进展。 相似文献
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等规聚丙烯增韧增强的研究进展 总被引:6,自引:0,他引:6
阐述了近年来国内外应用有机聚合物及无机刚性粒子对等规聚丙烯(iPP)增韧增强改性的研究进展,讨论了各种改性手段的优缺点,展望了通过形成纳米级复合材料的方法对iPP增韧增强的前景 相似文献
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Xianhua Tian Qihang Sun Xiaodong Yang Qingqing Wang Lei Wang Kun Wu 《International Journal of Applied Ceramic Technology》2024,21(3):2519-2530
Al2O3/TiN/graphene ceramic tool materials were prepared by spark plasma sintering technology and the strengthening and toughening mechanisms were studied. The influence of monolayer graphene content on the mechanical properties and microstructure of the composite material were analyzed and the strengthening and toughening mechanisms were researched. The results showed that with an addition of .5 vol.% graphene the mechanical properties of the material reached the best. The bending strength, hardness, and fracture toughness were 624 MPa, 23.24 GPa, and 6.53 MPa·m1/2, respectively. Graphene existed in the forms of few-layer and multilayer. The toughening mechanism of few-layer graphene was mainly graphene breaking, and that of multilayer graphene included graphene breaking and pulling-out. Graphene could contribute to the uniform growth of grains due to the excellent electrical conductivity and the high thermal conductivity. The addition of nano-TiN introduced many endocrystalline structures and graphene promoted this phenomenon. Micro-TiN grains made the crack extension show a combination of transgranular fracture, intergranular fracture, crack bridging, and crack deflection, while graphene introduced weak grain interfaces and made the crack appear more branches. The layered graphene made the material fracture change from two-dimension to three-dimension. 相似文献
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《Ceramics International》2023,49(1):834-846
In order to improve the strength and toughness of geopolymer concrete (GC) at different ages under impact load, using slag and fly ash as cementitious materials, NaOH and sodium silicate as alkaline activators, carbon fiber as reinforcement, carbon fiber reinforced geopolymer concrete (CFRGC) was prepared. The dynamic compression test of CFRGC was carried out by Φ 100 mm SHPB test system. The effects of age (3 d, 7 d, 28 d) and fiber content on the dynamic mechanical properties of CFRGC were studied, and the strengthening and toughening effects of carbon fiber on GC were analyzed. In addition, the strengthening and toughening effects of carbon fiber on GC and ordinary Portland cement based concrete (PC) were compared and analyzed. The results show that the performance indicators of CFRGC at different ages have strain rate effect under impact load, and the dynamic compressive strength and specific energy absorption of CFRGC increase approximately linearly with the strain rate. With the increase of age, the dynamic compressive strength and specific energy absorption of CFRGC increase, and the strain rate sensitivity of dynamic compressive strength and specific energy absorption also increases. With the increase of carbon fiber content, the dynamic compressive strength and specific energy absorption of CFRGC increase first and then decrease, and the strain rate sensitivity of dynamic compressive strength and specific energy absorption also increase first and then decrease. When the carbon fiber content is 0.2%, the dynamic mechanical properties of CFRGC are the best, and the strain rate sensitivity of performance indicators is the strongest. Carbon fiber has strengthening and toughening effects on GC and PC. When the fiber content is 0.2%, carbon fiber has the best strengthening and toughening effects on GC and PC. The strengthening and toughening effects of carbon fiber on GC is better than that of PC. Compared with 28 d, carbon fiber has better strengthening and toughening effects on GC at the ages of 3 d and 7 d. 相似文献
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Li-Juan Yuan Peng-Jie Zhang Fei Zuo Rui-Xin Luo Zhao-Liang Guo Kevin Plucknett Bei-Bei Jiang Guang-Lin Nie Fan Meng Víctor Valcárcel-Juárez Alexandre Maître Hua-Tay Lin 《Journal of the European Ceramic Society》2021,41(1):706-718
The densification behavior, microstructural development, toughening and strengthening mechanisms of Al2O3 whisker-reinforced 3Y-TZP and 12Ce-TZP composites were systematically and comparatively investigated with varying whisker lengths. Compared with 3Y-TZP/Aw composites, the presence of a Ce-Al-Si-O amorphous phase, caused by the addition of Al2O3 whiskers, promoted the densification and grain growth of 12Ce-TZP/Aw composites. Crack deflection and bridging are proposed as the primary toughening mechanisms for 3Y-TZP/Aw composites, while the t-m martensitic transformation would dominate the toughening and strengthening processes of 12Ce-TZP/Aw composites. Changes in Al2O3 whisker length would vary the distributions of internal stress and amorphous phase within the ceria-stabilized ZrO2 matrix, and hence affect the toughening and strengthening results. It indicates that effective toughening and strengthening of the Al2O3 whisker-reinforced TZP composites can be achieved by taking advantage of collaborative engineering control on the reinforcement morphology and the interface chemistry/structure. 相似文献