共查询到18条相似文献,搜索用时 125 毫秒
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利用胶体钯溶液对碳纳米管(CNTs)进行活化处理,再采用化学镀的方法在碳纳米管表面沉积金属镍镀层,得到镀镍碳纳米管(Ni/CNTs)。通过场发射扫描电子显微镜(FESEM)、能量色散谱(EDS)、X射线衍射(XRD)和分光光度法对Ni/CNTs和镀液进行表征,分析了镍镀层形成的热力学条件与过程。结果表明:CNTs化学镀镍层为非晶态;CNTs浓度及反应温度对Ni2+沉积速率无明显影响;NaOH和NaH2PO2浓度与Ni2+沉积速率呈线性关系;镍镀层生长符合球形融合模型,通过改变CNTs浓度,可对镀层形貌进行有效调控。 相似文献
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ABS塑料表面化学镀镍无钯活化工艺研究 总被引:1,自引:0,他引:1
提出了一种非金属表面化学镀镍无钯活化工艺,即在常温下,以NaBH4为还原剂,在ABS塑料上沉积活性镍,以此活性镍为活化中心,进行化学镀镍.研究确定了活化液的最佳配方,并利用均匀设计方法确定了在ABS塑料表面化学镀镍最佳工艺条件为:19g/L Ni(Ac)2·4H2O,22g/LNaH2PO2,0.02 mL/L N2H4·H2O,40 mg/L糖精;镀液pH值5.0~5.6,温度70~80℃.采用SEM、XRD、EDS等手段对镀层的形貌、结构、成分及含量进行了表征.结果表明:所得镀液稳定,镀速快,镀镍层均匀,结合力强,说明在ABS塑料表面用该无钯活化新工艺取代钯活化是可行的. 相似文献
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空心微珠表面改性及其吸波特性 总被引:35,自引:0,他引:35
采用化学镀的方法对空心微珠表面金属化改性进行研究,并利用扫描电镜及能谱分析仪对表面镀镍后的形貌进行观察、测定,结果表明镍较均匀附着在微珠的表面。分别将改性前后的微珠制备成吸波材料,测试其吸波性能。测试结果表明,改性后的空心微珠具有较好的吸波性能,在8-18GHz扫频测试范围内,小于-10dB的频段范围在16.6-18GHz,最大吸收可达-13.57dB,对应的频率为17.2GHz。空工心微珠表面改性为其再利用找到有效的途径。 相似文献
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Glass cenospheres were used as space holders for making aluminum matrix syntactic foams by pressure infiltration technique. The mechanical properties and failure behavior of cenospheres/Al syntactic foams with pure Al and Al–Mg alloys were investigated in the present work. The failure behavior of cenospheres in two syntactic foams was similar. However, the mechanical behavior of these two syntactic foams was different. Under compression process, the cenospheres/pure Al showed discontinuous shear band and drum shape, while cenospheres/Al–Mg exhibited continuous shear band and was divided by main shear zone. At the tensile state, the cenospheres in pure Al matrix syntactic foam debonded from the matrix, while the cenospheres in Al–Mg matrix syntactic foam was well-bonded and appeared to lamellar tearing. It is suggested that the difference of mechanical deformation behavior could be attributed to the matrix ductility and the forming of interfacial reaction product MgAl2O4 coatings. 相似文献
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对粉煤灰空心微珠/环氧树脂复合材料进行了弯曲试验,研究了微珠粒径、含量以及级配比例对复合材料弯曲性能的影响,并通过弯曲断口微观形貌分析了内在机理。结果表明,空心微珠的加入对粉煤灰空心微珠/环氧树脂复合材料的弯曲强度影响很大。随空心微珠含量的增加,复合材料的弯曲强度呈现先升高后下降的趋势,填充量为15wt%时,复合材料的弯曲强度最大;随空心微珠粒径的减小,复合材料的弯曲强度随之提高,小粒径微珠对环氧树脂复合材料弯曲强度的提升效果更好;空心微珠级配填充环氧树脂复合材料的弯曲强度主要受级配微珠中小粒径微珠含量的影响,小粒径微珠的比例越大,弯曲强度越高。 相似文献
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制备了粉煤灰微珠/环氧树脂复合材料涂层,并利用JM-V型磨耗仪对涂层材料进行了磨损试验,研究了粉煤灰微珠含量、微珠粒径以及试验负载和速度对复合涂层耐磨性能的影响。结果表明,随粉煤灰微珠含量的增加,涂层的耐磨性呈先增加后下降的趋势,当填充的微珠质量分数为15%时,复合材料涂层的耐磨性最佳。随微珠粒径的增大,微珠在磨损过程中更加容易破碎,导致复合材料涂层的耐磨性随之下降。对比不同载荷和速度下复合材料涂层的磨损试验结果发现,随负载的增加,复合材料涂层的耐磨性降低;加快试验速度,涂层材料的磨损量也随之变大。 相似文献
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Influence of cenospheres on properties of magnesium oxychloride cement-based composites 总被引:4,自引:0,他引:4
In this study, influence of cenospheres on density, compressive strength, water resistance property and thermal conductivity of magnesium oxychloride cement (MOC)-based composites was systematically investigated, which could provide useful information for the further development of light-weight thermal insulation MOC-based composites. Addition levels of the cenospheres in this study are 0, 5, 15 and 25 %, by weight of magnesia powder. It shows that although compressive strengths of the MOC-based composites are clearly reduced by the incorporation of the cenospheres, they are still maintained at high strength levels above 60 MPa at 28 days. In addition, the use of the cenospheres causes obvious reductions on both composite density and thermal conductivity, demonstrating favorable effects for the further development of light-weight thermal insulation MOC-based composites. However, water resistance property of the MOC-based composites is deteriorated by incorporation of the cenospheres, especially at high addition levels. It suggests that when the cenospheres are used for making light-weight thermal insulation MOC-based composites, their influence on this property should be highly considered. 相似文献