排序方式: 共有49条查询结果,搜索用时 15 毫秒
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采用挤出混合与注塑成型制备出不同含量的纳米Al2O3填充LDPE/POM复合材料,并进行力学和摩擦磨损性能实验。结果表明,随着纳米Al2O3的增加,LDPE/POM复合材料的缺口冲击性能先提高后降低,其中添加8%纳米Al2O3后复合材料的缺口冲击强度提高了近3倍;添加Al2O3纳米粒子后增加了复合材料的摩擦因数,但对耐磨性影响不大。由于纳米Al2O3作为刚性粒子可以提高材料的硬度,因此复合材料仍表现出良好的耐磨性;然而纳米粒子在摩擦表面富集,产生了犁沟现象,因此提高了材料的摩擦因数。 相似文献
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通过正交和单因素试验,得出采用直流电流电镀时,Ni/α-Al2O3纳米复合电镀的最佳工艺规范为:α-Al2O3 5~10g/L,分散剂5~10mL/L,阴极电流密度1~4~dm^2,pH4.0~4.8,温度50~60℃,空气搅拌强度0.4~0.5m^3/ll,并讨论了各因素的影响规律。 相似文献
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利用溶胶-凝胶技术制备了纳米氧化铝改性纳迪克酰亚胺复合材料。采用傅里叶红外光谱(FTIR)、扫描电镜(SEM)和原子力显微镜(AFM)等手段对该材料的结构及表面断裂形貌进行了表征,其粒子尺寸为40~100 nm。研究了氧化铝添加量对该复合材料耐电晕性能和耐热性能的影响。结果表明:随着氧化铝含量的增加,材料的耐电晕性能显著增强,当纳米氧化铝质量分数为16%、试样厚度25 μm、击穿场强60 kV/mm时,耐电晕寿命达130 h,是改性前的11倍;热分解温度为498.63℃,比掺杂前提高20℃,剪切强度略有降低。 相似文献
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Zhiwei Wang Lijia Liu Yonghe Li Hongxing Dong Zeming Chen 《Journal of Adhesion Science and Technology》2019,33(16):1770-1789
In the case of bonding of aluminum alloy, surface pretreatment have been widely adopted for adherends so as to achieve superior adhesive performance. However, the strict surface treatment of the aluminum alloy cannot be implemented without special equipment and the mechanical properties, corrosion resistance and aging resistance of the common adhesives cannot meet the demand without surface treatment. Here, acrylic oligomer modified by carboxyl terminated organosilicon and nano alumina were used to modify an epoxy formulation based on a classical DGEBA monomer to produce a high peel strength epoxy adhesive that can be used without surface pretreatment. The peel strength and the shear strength of the adhesive could reach 7.18?N/cm and 18.75?MPa, respectively, and could be well maintained under ?70?°C and 100?°C. The novel adhesive also has good heat aging resistance, water resistance and artificial seawater resistance. SEM and XPS were used to investigate mechanism of aging resistance of modified adhesives without surface treatment. 相似文献
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