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对偶表面粗糙度对Nano-SiO2改性PTFE复合材料摩擦学性能的影响 认领 引用 被引量：12
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作者 高贵 李瑞红 +4 位作者 龚俊 王宏刚 杨东亚 任俊芳 陈生圣 《工程科学与技术》 EI CAS CSCD 北大核心 2020年第2期207-214,共8页
为了研究干摩擦条件下对偶面粗糙度对纳米粒子填充改性聚四氟乙烯(PTFE)摩擦学性能的影响,采用冷压成型、热烧结的工艺方法制备nano-SiO2填充改性PTFE复合材料;采用LSR–2M型往复摩擦磨损试验机评价了nano-SiO2改性PTFE复合材料与具有3... 为了研究干摩擦条件下对偶面粗糙度对纳米粒子填充改性聚四氟乙烯(PTFE)摩擦学性能的影响,采用冷压成型、热烧结的工艺方法制备nano-SiO2填充改性PTFE复合材料;采用LSR–2M型往复摩擦磨损试验机评价了nano-SiO2改性PTFE复合材料与具有3种不同表面粗糙度的对偶钢块(GCr15)之间的摩擦学特性;利用光学显微镜(OM)、扫描电子显微镜(SEM)和能谱仪(EDS)分别表征了转移膜及磨屑的形貌、微观结构以及化学成分,从微观角度揭示nano-SiO2改性PTFE复合材料的摩擦转移机理。试验结果表明:纯PTFE及不同含量nano-SiO2改性PTFE复合材料的摩擦系数随着对偶钢块表面粗糙度的增大整体呈现增大趋势,在粗糙度Ra为0.1的对偶表面上复合材料的摩擦系数随着nano-SiO2含量的增加变化相对较小;在3种不同粗糙度对偶表面上,nano-SiO2的加入均有效降低了PTFE的磨损体积,当填充比例为0.5%时复合材料在粗糙度Ra为1.2的对偶面上摩擦学性能最佳,磨合时间比纯PTFE缩短了近10 min,耐磨性比纯PTFE提高了33.3%;复合材料中nano-SiO2的含量与对偶表面粗糙度存在一定的协同效应,即填充适量nano-SiO2的PTFE复合材料与具有一定表面粗糙度的对偶钢块组成的摩擦配副能有效促进复合材料的摩擦转移,并能在对偶表面形成覆盖率高、均匀、连续、表面较粗糙且与摩擦方向趋向一致的转移膜,有利于降低材料的磨损。 展开更多
关键词 聚四氟乙烯 nano-SiO2 对偶表面粗糙度 摩擦转移 转移膜
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石英和Nano-SiO2粉体对A549细胞炎性因子的影响 认领 引用 被引量：3
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作者 霍婷婷 董发勤 +3 位作者 邓建军 张青碧 代群威 王明翠 《矿物学报》 CAS CSCD 北大核心 2013年第3期402-407,共6页
采用体外培养的方法,研究了2种粒径的石英粉体(KWC-Q3和KWC-Q4)和纳米二氧化硅粉体(Nano-SiO2)对A549细胞存活率、乳酸脱氢酶(LDH)释放、白细胞介素(IL-6)和肿瘤坏死因子(TNF-α)的影响。结果表明Nano-SiO2对A549细胞的毒性作用最大,对K... 采用体外培养的方法,研究了2种粒径的石英粉体(KWC-Q3和KWC-Q4)和纳米二氧化硅粉体(Nano-SiO2)对A549细胞存活率、乳酸脱氢酶(LDH)释放、白细胞介素(IL-6)和肿瘤坏死因子(TNF-α)的影响。结果表明Nano-SiO2对A549细胞的毒性作用最大,对KWC-Q3其次,对KWC-Q4毒性最弱;随着暴露矿物粉体浓度的升高,细胞的死亡率明显升高,细胞释放的LDH随之升高,存在剂量效应关系。石英和Nano-SiO2能够引起A549细胞分泌IL-6的增加,但是并未引起TNF-α变化。 展开更多
关键词 石英 Nano-SiO2 细胞存活率 LDH IL-6 TNF-α
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Influence of Nano-SiO2 Addition on Properties of Sulphoaluminate Cement Based Material 认领 引用 被引量：3
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作者 马保国 李海南 +1 位作者 MEI Junpeng LI Xiangguo 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第1期106-112,共7页
The influences of different nano-SiO2（NS） contents on the mechanical properties and rheological behavior of sulfoaluminate cement（SAC） based composite materials were studied.Results show that with increasing conte... The influences of different nano-SiO2（NS） contents on the mechanical properties and rheological behavior of sulfoaluminate cement（SAC） based composite materials were studied.Results show that with increasing content of NS,the apparent viscosity,and shearing strength of fresh paste gradually increase but the fluidity decreases.With a dosage of 3.0%NS,the tensile and flexural strengths of mortars at 56 days were increased by 87.0%and 84.6%,respectively,compared with that in the absence of NS,indicating that the toughness of hardened mortars is significantly improved.Besides,the exothermic peaks of hydration are obviously increased and will earlier occur,and the second and the third peaks appear 2.61 hours and 2.56 hours earlier,respectively than that in the absence of NS,and the hydration of SAC before 8 hours is accelerated.The forming mechanism of strengths was revealed by scanning electron microscopy（SEM）,hydration heat,X-ray diffraction（XRD） and derivative thermogravimetry（DTG）.The micro-aggregate filling effect and nucleation effect at early age and weak pozzolanic effect at late age of NS make the microstructure more compact,which obviously enhances the strength of SAC mortars. 展开更多
关键词 sulfoaluminate cement nano-SiO2 ettringite strengths hydration process
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改性nano-SiO2/HDPE复合体系性能的研究 认领 引用 被引量：2
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作者 魏凤琴 薛涛 +1 位作者 曾舒 房春燕 《化工新型材料》 CAS 北大核心 2009年第1期63-65,共3页
采用母粒法将改性后的粉体SiO2与HDPE树脂混合、制样,并对样品的力学性能及粉体在基体树脂中的分散情况等进行了测试。结果表明:纳米SiO2对HDPE有一定的增强增韧作用;填充纳米SiO2的改性PE强度和韧性高于纯PE;随着纳米SiO2含量的增大,... 采用母粒法将改性后的粉体SiO2与HDPE树脂混合、制样,并对样品的力学性能及粉体在基体树脂中的分散情况等进行了测试。结果表明:纳米SiO2对HDPE有一定的增强增韧作用;填充纳米SiO2的改性PE强度和韧性高于纯PE;随着纳米SiO2含量的增大,复合材料的增强增韧效果越强.同时经过改性的SiO2在树脂中有很好的分散效果。 展开更多
关键词 nano-SiO2 HDPE 增强增韧
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动态填充注塑成型PP/nano-SiO2复合材料的力学性能与形貌分析 认领 引用 被引量：1
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作者 杨子林 杨东福 张兵 《塑料科技》 CAS 北大核心 2020年第3期30-33,共4页
采用动态填充注塑成型(DFIM)制备了聚丙烯/二氧化硅(PPano-SiO2)复合材料。结果表明:与传统的注塑成型技术相比,采用DFIM法制备的PPano-SiO2复合材料的拉伸强度和冲击强度比纯PP材料和常规注射制备的复合材料有了较大提高;nano-SiO2通过... 采用动态填充注塑成型(DFIM)制备了聚丙烯/二氧化硅(PPano-SiO2)复合材料。结果表明:与传统的注塑成型技术相比,采用DFIM法制备的PPano-SiO2复合材料的拉伸强度和冲击强度比纯PP材料和常规注射制备的复合材料有了较大提高;nano-SiO2通过DPIM技术可以更好地分散在PP基质中,形成的团聚较少。DFIM法制备的PPano-SiO2复合材料力学性能的提高,主要归因于nano-SiO2颗粒的均匀分布,使球晶的数量急剧增加,球晶的尺寸明显减小,小晶体有助于形成材料裂纹,从而进一步提高材料的力学性能。 展开更多
关键词 PP nano-SiO2 动态填充注射成型 力学性能 形貌
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PVC/Nano-SiO2复合材料性能研究 认领 引用 被引量：7
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作者 崔文广 高岩磊 +1 位作者 刘会茹 郧海丽 《塑料科技》 CAS 北大核心 2013年第10期31-33,共3页
采用熔融共混法制备了聚氯乙烯/纳米二氧化硅(PVCano-SiO2)复合材料,研究了nano-SiO2用量对复合材料力学性能的影响,并利用扫描电镜(SEM)分析了nano-SiO2在PVC基体中的分散性。结果表明:随着nano-SiO2用量的增加,PVCano-SiO2复合材料的... 采用熔融共混法制备了聚氯乙烯/纳米二氧化硅(PVCano-SiO2)复合材料,研究了nano-SiO2用量对复合材料力学性能的影响,并利用扫描电镜(SEM)分析了nano-SiO2在PVC基体中的分散性。结果表明:随着nano-SiO2用量的增加,PVCano-SiO2复合材料的冲击强度和拉伸强度均呈先增后降趋势,而弯曲模量则呈增加趋势;另外,随着nano-SiO2用量的增加,其在PVC基体中的分散性逐渐变差。 展开更多
关键词 聚氯乙烯 纳米二氧化硅 复合材料 性能
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掺加nano-SiO2的水泥稳定冷再生基层材料性能研究 认领 引用 被引量：1
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作者 冯纪兵 董硕硕 《价值工程》 2020年第8期105-107,共3页
为研究掺入nano-SiO2的水泥稳定冷再生基层材料性能的变化规律,将合成级配优化后,设计6种掺量配比以研究nanoSiO2对水稳冷再生基层混合料力学性能的影响。试验结果表明,掺加nano-SiO2的水稳冷再生混合料的7d、28d、90d无侧限抗压强度和... 为研究掺入nano-SiO2的水泥稳定冷再生基层材料性能的变化规律,将合成级配优化后,设计6种掺量配比以研究nanoSiO2对水稳冷再生基层混合料力学性能的影响。试验结果表明,掺加nano-SiO2的水稳冷再生混合料的7d、28d、90d无侧限抗压强度和90d劈裂强度均有提升,其中7d无侧限抗压强度、90d劈裂强度提升最为明显,28d、90d抗压强度也有所提升,但提升效果有限。 展开更多
关键词 道路工程 冷再生基层 nano-SiO2 力学性能 水泥稳定
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Fire and Corrosion Resistances of Intumescent Nano-coating Containing Nano-SiO2in Salt Spray Condition 认领 引用 被引量：12
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作者 Zhenyu Wang Enhou Han +1 位作者 Fuchun Liu Wei Ke 《Journal of Materials Science & Technology》 SCIE EI CAS 2010年第1期75-81,共7页
The nano-concentrates and flame retardant nano-coating were prepared in thhis study.The effect of nano-SiO2 on the corrosion resistance and fire resistance of ammonium polyphosphate-pentaerythritol-melamine(APP-PER-ME... The nano-concentrates and flame retardant nano-coating were prepared in thhis study.The effect of nano-SiO2 on the corrosion resistance and fire resistance of ammonium polyphosphate-pentaerythritol-melamine(APP-PER-MEL)coating was investigated by differential thermal analysis(DTA),scanning electron microscopy(SEM),effective thermal conductivity(λ/d),X-ray photoelectron spectroscopy(XPS)and fire protection test.The chemical action and endothermic effect of ammonium polyphosphate,pentaerythritol and melamine in traditional flame retardant coating were damaged by salt spray condition,whereas the flame-retardant additives in the nano-coating demonstrated the good chemical interaction in salt spray condition.The uniformly dispersed nano-SiO2 particles could improve corrosion resistance of the coating,and hence nano-coating could remain the good fire-resistant properties even after 500 h salt spray test. 展开更多
关键词 Nano-SiO2 APP-PER-MEL coating Nano-coating Salt spray test Fire-resistant property
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Freezing Resistance of HPC with Nano-SiO_2 认领 引用 被引量：5
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作者 王宝民 WANG Lijiu F C Lai 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第1期85-88,共4页
The test of fast-freezing method is employed to research the freezing resistance of C60 and C80 high-performance concrete with nanometer-SiO2, and XRD and SEM are employed to analyze the mechanism of its influence. Th... The test of fast-freezing method is employed to research the freezing resistance of C60 and C80 high-performance concrete with nanometer-SiO2, and XRD and SEM are employed to analyze the mechanism of its influence. The experimental results show that the freezing resistance of high-performance concrete has been effectively improved. The compressive strength of C60, C70 and C80 high-performance concrete added with nano-SiO2 can be improved by 8%, 6% and 5% respectively, the weight loss can be reduced by 1%, 0.6% and 0.3% respectively and the relative dynamic elastic modulus can be improved by 7%, 4% and 6% respectively after the 300 times freeze-thaw cycle. 展开更多
关键词 nano-SiO2 high-performance concrete freezing resistance
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偶联剂SCA-3对CE/nano-SiO_2复合材料胶粘性的影响 认领 引用 被引量：6
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作者 张学英 张文根 祝保林 《中国胶粘剂》 CAS 北大核心 2010年第6期42-45,共4页
采用高速均质剪切法制备了氰酸酯树脂(CE)ano-SiO2复合材料,考察了经偶联剂(SCA-3)表面处理过的nano-SiO2对复合材料黏度和凝胶时间的影响。结果表明:SCA-3能够有效提高复合材料的黏度;当温度为100℃时,与未经偶联剂表面处理过的nano-Si... 采用高速均质剪切法制备了氰酸酯树脂(CE)ano-SiO2复合材料,考察了经偶联剂(SCA-3)表面处理过的nano-SiO2对复合材料黏度和凝胶时间的影响。结果表明:SCA-3能够有效提高复合材料的黏度;当温度为100℃时,与未经偶联剂表面处理过的nano-SiO2/CE复合材料相比,经SCA-3表面处理后的nano-SiO2/CE复合材料,其黏度相对提高率为13.42%,凝胶时间相对减小率为8.17%。 展开更多
关键词 氰酸酯树脂 偶联剂 nano-SiO2 胶粘性
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Synthesis of Waterborne Polyurethane Modified by Nano-SiO_2 Silicone and Properties of the WPU Coated RDX 认领 引用 被引量：4
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作者 Li Yang Zhao Tianbo +2 位作者 Qu Xiaoling Ding Hongjing Li Fengyan 《China Petroleum Processing & Petrochemical Technology》 CAS 2015年第2期39-45,共7页
A series of nano silica/silicone modified waterborne polyurethane(WPU) have been synthesized from polytetramethylene glycol and isophorone diisocyanate, dihydroxymethyl propionic acid and triethylamine, ethylenediamin... A series of nano silica/silicone modified waterborne polyurethane(WPU) have been synthesized from polytetramethylene glycol and isophorone diisocyanate, dihydroxymethyl propionic acid and triethylamine, ethylenediamine, trimethylolpropane, nano-SiO2 and the silane coupling agent KH550. The effect of the dosage of nano-SiO2 on the WPU-Si membrane and the coated RDX(cyclotrimethylenetrinitramine) particles have been studied in terms of their surface properties, mechanical properties, and thermal stability. The results showed that with the increase of Si content, the stability of the emulsion reduced gradually. The material with more Si content displayed an increased thermodynamic stability, an increased high temperature resistance, an increased tensile strength and a decreased elongation at break. With the increase of Si content, the surface tension of the material decreased, the bibulous rate reduced, and the contact angle increased gradually, so that the surface tension of the polyurethane and RDX are close to each other which could improve the performance of coating. 展开更多
关键词 nano-SiO2 organic silicon waterborne polyurethane coating of RDX
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Effect of Hyperbranched Poly(amine-ester) Grafted Nano-SiO_2 on Reinforcement and Toughness of PVC 认领 引用 被引量：2
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作者 李杰 赵辉 +1 位作者 孙瑞敏 罗运军 《Journal of Beijing Institute of Technology》 EI CAS 2008年第1期104-108,共5页
Nano-SiO2 was modified using silane coupling agent （KH-550） and hyperbranched poly（amine-ester） respectively, and Poly（vinyl chloride） （PVC）/modified nano-SiO2 composites were made by melt-blending. The compos... Nano-SiO2 was modified using silane coupling agent （KH-550） and hyperbranched poly（amine-ester） respectively, and Poly（vinyl chloride） （PVC）/modified nano-SiO2 composites were made by melt-blending. The composites＇ structures andmechanical properties were characterized by transmission electron microscopy（TEM）, sanning electronic microscopy（SEM） and electronic universal testing machine. The results. show that nano-SiO2 grafted by hyperbranched poly （amine-ester） increases obviously in dispersion in PVC matrix, and mechanical properties of PVC are effectively improved. Moreover, it was found that mechanical properties of PVCano-SiO2 composites reach the best when weight percent of nano-SiO2 in PVC matrix is 1%. Compared with crude PVC, the tensile strength of hyperbranched poly （amine-ester） grafted nano-SiO2/ PVC composite increases by 24.68 % and its break elongation, flexural strength and impact strength increase by 15.73%, 4.07% and 1 841.84%, respectively. Moreover, the processing of the composites is improved. 展开更多
关键词 nano-SiO2 hyperbranched poly （amine-ester） one-step polycondensation dispersion and stability
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Effect of Wet Surface Treated Nano-SiO_2 on Mechanical Properties of Polypropylene Composite 认领 引用 被引量：3
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作者 王东波 冯玉杰 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第3期354-357,共4页
Nano-SiO2/polypropylene composite was prepared by melt-blending process. The nano-SiO2 particles were organized by wet process surface treatment with silane coupling agent KH-570. The effect of mass fraction of nano-S... Nano-SiO2/polypropylene composite was prepared by melt-blending process. The nano-SiO2 particles were organized by wet process surface treatment with silane coupling agent KH-570. The effect of mass fraction of nano-SiO2 particles and dosage of KH-570 on the toughening and strengthening of PP matrix were investigated based on the fractography of impact notch and the analysis of crystal structure by X-ray and dispersive structure of nano-SiO2 by TEM. Results show that the impact and flexural strength and modulus of the composite are improved obviously with low loading of nano-SiO2 （3 wt%-5 wt%）, and the izod impact strength of PP increases twice with 4 wt% nano-SiO2. The nano-SiO2 particles treated can disperse into the matrix resin, which has evident heterogeneous nucleation effects on the crystallization of PP. The optimal toughening and strengthening effects of PP matrix can be obtained when the content of nano-SiO2 and KH-570 are 4 wt% and 3 wt%, respectively. 展开更多
关键词 nano-SiO2 silane coupling agent wet process surface treatment polypropylene mechanical properties
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PLA/PBS/Nano-SiO_2制备及性能研究 认领 引用 被引量：5
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作者 苏桂仙 王佳伟 +2 位作者 李佳 陈冰钰 张斌 《唐山师范学院学报》 2017年第5期9-12,共4页
采用γ-缩水甘油醚氧丙基三甲氧基硅烷(GPTS)对nano-SiO_2进行表面改性。然后采用熔融共混法,以聚丁二酸丁二酯(PBS)、GPTSano-SiO_2为改性剂,聚乙烯蜡(PEW)为润滑剂,聚乙二醇(PEG)为增塑剂,改性聚乳酸(PLA),对改性后共混物耐热性、力... 采用γ-缩水甘油醚氧丙基三甲氧基硅烷(GPTS)对nano-SiO_2进行表面改性。然后采用熔融共混法,以聚丁二酸丁二酯(PBS)、GPTSano-SiO_2为改性剂,聚乙烯蜡(PEW)为润滑剂,聚乙二醇(PEG)为增塑剂,改性聚乳酸(PLA),对改性后共混物耐热性、力学性能和流变性能的研究。结果表明,改性的nano-SiO_2加入量为1.5份时,PLA的综合力学性能最好,其拉伸强度为63.4 MPa。PBS和nano-SiO_2的加入并未使PLA复合物的热性能和加工性能降低。 展开更多
关键词 聚丁二酸丁二酯 nano-SiO2 共混 聚乳酸
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Preparation of Nano-SiO_2/Amino-modified Polysiloxane Hybrid Superhydrophobic Coating and Thermal-stability Characterization 认领 引用 被引量：3
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作者 李金桦 翁睿 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第1期35-39,共5页
We put forward a large-area and cost-effective method to fabricate superhydrophobic coating by introducing in-situ functionalized nano-SiO2 into side-amino modified hydroxy-terminated polydimethylsiloxane （SA-HTPDMS... We put forward a large-area and cost-effective method to fabricate superhydrophobic coating by introducing in-situ functionalized nano-SiO2 into side-amino modified hydroxy-terminated polydimethylsiloxane （SA-HTPDMS） curing system. With the characterization using water contact angle （WCA） tester, Fourier transform infrared spectroscopy （FTIR）, scanning electron microscope （SEM）, atomic force microscopy （AFM） and simultaneous thermal analysis, the as-prepared coating displayed a tremendous WCA of 154.8±1°, sliding angle （SA） about 3.5° and stable self-cleaning property range from -10 to 80 ℃. It was also found that the synergistic effect of surface micro-nano hierarchical structure and chemical hydrophobicity, stability from matrix had made contributions to the superhydrophobicity and excellent heat resistance up to 300 ℃. 展开更多
关键词 nano-SiO2 amino-modified polysiloxane thermal-stability superhydrophobic
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PVA/Nano-SiO_2杂化膜的制备及性能研究 认领 引用 被引量：1
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作者 迟长龙 王延伟 +2 位作者 王玉周 高元元 于翔 《塑料科技》 CAS 北大核心 2014年第9期55-58,共4页
以聚乙烯醇(PVA)和正硅酸乙酯(TEOS)为原料,通过溶胶-凝胶(Sol-Gel)技术,制备出不同nano-SiO2含量的PVAano-SiO2杂化膜,并采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)等仪器测试和分析了杂化膜的结构和性能。结果表明:随着nano-SiO2含... 以聚乙烯醇(PVA)和正硅酸乙酯(TEOS)为原料,通过溶胶-凝胶(Sol-Gel)技术,制备出不同nano-SiO2含量的PVAano-SiO2杂化膜,并采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)等仪器测试和分析了杂化膜的结构和性能。结果表明:随着nano-SiO2含量的增加,PVA杂化膜的耐水性能增强,结晶能力下降,而力学性能呈现先增大后减小的趋势。当nano-SiO2的加入量在10%左右时,断裂伸长率由纯PVA膜的34.74%提高到55.52%,拉伸强度从33.08 MPa增加到49.98 MPa;而当nano-SiO2含量增加到20%以上时,nanoSiO2粒子会发生团聚,使得杂化膜的力学性能变差。 展开更多
关键词 聚乙烯醇 Nano-SiO2 杂化膜 溶胶-凝胶 力学性能
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A Comparative Study on the Pozzolanic Activity between Nano-SiO_2 and Silica Fume 认领 引用 被引量：12
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作者 叶青 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2006年第3期153-157,共5页
The pozzolanic activity of nano-SiO2 and silica fume was comparatirely stndied by X-ray diffraction （ XRD ） , differential scanning calorimetry （DSC）, scanning electron micrascopy （SEM） and the compressive , bon... The pozzolanic activity of nano-SiO2 and silica fume was comparatirely stndied by X-ray diffraction （ XRD ） , differential scanning calorimetry （DSC）, scanning electron micrascopy （SEM） and the compressive , bond and bending streugths of hardened paste and concrete were also measured. Results indicate that the compressive strength development of the paste made from Ca（OH）2 and nano-SiO2, the reaction rate of Ca（ OH）2 with nano- SiO2 and the velocity of C-S-H gel formation from Ca （ OH）2 with nano-SiO2 showed marked increases over those of Ca（ OH）2 with silica fume. Furthermore, the bond strength at the interface between aggregate and hardened cement paste, and the bending strength of concrete incorporated with 3% .NS increased more than those with SF, especially at early ages. To sum up, the pozzolanic activity of nano-SiO2 was much greater than that of silica fume. The results suggest that with a small amount of nano-SiO2, the Ca（ OH）2 crystal at the interface between hardened cement paste and aggregate at early ages may be effectively absorbed in high performance concrete. 展开更多
关键词 Ca（OH）2 interaction nano-SiO2 pozzolanic activity silica fume
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Synthesis of Modified Epoxy Resin Undercoat for Resistor by Nano-SiO_2 认领 引用 被引量：1
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作者 王秀宇 张之圣 +1 位作者 李海燕 胡明 《Transactions of Tianjin University》 EI CAS 2006年第3期193-198,共6页
A kind of undercoat for resistor with high temperature and humidity resistance was obtained by modifying epoxy resin with proper nano-SiO2 added at 80℃. The structure, thermal stability, humidity resistance, and morp... A kind of undercoat for resistor with high temperature and humidity resistance was obtained by modifying epoxy resin with proper nano-SiO2 added at 80℃. The structure, thermal stability, humidity resistance, and morphological characteristics of the modified epoxy resin undercoat were studied by electrical tests, infrared spectra （IR） analysis, and scanning electron microscopy （SEM）. The results show that more compact and steady inter-crosslinked network structures are formed in the modified epoxy resin undercoat added with nano-SiO2, which greatly improves the performance of modified epoxy resin undercoat. The undercoat with nano-SiO2 of about 2. 71%, kept for six months at room temperature without flocculating and aggregating, is of good stability, and the surface of painted resistor is uniform, tight and without air holes on it. The varying ratio of resistance with such undercoat painted is less than one in a thousand after high temperature and humidity resistance tests. 展开更多
关键词 epoxy resin nano-SiO2 undercoat high temperature and humidity resistance
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Effect of NH_4F and Nano-SiO_2 on Morphological Control of α-Al_2O_3 Platelets via Solid-state Reaction 认领 引用 被引量：8
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作者 Miao Zhuang Shi Jiangong +1 位作者 Zhang Wenping Zhang Minhong 《China Petroleum Processing & Petrochemical Technology》 CAS 2016年第4期19-24,共6页
Alpha-alumina(α-Al_2O_3) platelets were prepared via solid-state reaction using pseudo-boehmite as the starting material, while NH_4F and nano-SiO_2 were used as additives, and nitric acid was used as the binder. The... Alpha-alumina(α-Al_2O_3) platelets were prepared via solid-state reaction using pseudo-boehmite as the starting material, while NH_4F and nano-SiO_2 were used as additives, and nitric acid was used as the binder. The effect of these additives on properties of the alumina platelets was determined via scanning electron microscopy, X-ray diffraction, and measurements of the surface area and silicon content. A mechanism governing their role in the synthesis process was proposed. The results indicated that NH_4F could promote the formation of highly crystalline platelets. Addition of nano-SiO_2 could lead to increase in the diameter and reduction in the thickness of the platelets, and could also prevent their transformation to α-Al_2O_3. This addition weakened the effect of NH_4F because of the reaction of nano-SiO_2 with F-species and the formation of volatile SiF_4. 展开更多
关键词 α-Al2O3 nano-SiO2 NH4F solid-state reaction
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预聚时间对CE/nano-SiO_2型粘结片性能的影响 认领 引用 被引量：2
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作者 张文根 张学英 《渭南师范学院学报》 2015年第14期40-43,共4页
粘结片是印制电路板制造过程的中间步骤,其性能决定着印制电路板的可靠性.通过制备氰酸酯树脂(CE)/纳米二氧化硅(nano-Si O2)复合材料胶液,用该胶液对E-玻璃纤维实施浸润制造粘结片,探讨胶液的预聚时间对粘结片性能的影响.结果表明,预... 粘结片是印制电路板制造过程的中间步骤,其性能决定着印制电路板的可靠性.通过制备氰酸酯树脂(CE)/纳米二氧化硅(nano-Si O2)复合材料胶液,用该胶液对E-玻璃纤维实施浸润制造粘结片,探讨胶液的预聚时间对粘结片性能的影响.结果表明,预聚时间为80 min时,粘结片的含胶量和吸水率合理适宜,分别为42.04%和0.83%;可溶分含量相对偏高,为94.79%,应改进工艺条件进一步降低到理想状态. 展开更多
关键词 氰酸酯树脂 nano-SiO2 粘结片 浸润性
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