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介绍了用化学还原法生产电子元件用高纯超细球形银粉,钯银合金粉的车间生产工艺及其生产设备特点,探讨了影响粉末形貌的各个因素,用本工艺与设备批量生产的银粉、钯银合金粉完全符合电子元件的使用要求。 相似文献
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以超细球银与片状银粉复配作为导电相,二官能度的端乙烯基聚氨酯丙烯酸酯预聚物作为粘结相,制备出高电导率、高附着力和高柔韧性的紫外光固化聚氨酯基导电银浆。研究了超细球银与片状银粉的相对用量对银浆电导率、附着力和耐弯折性能的影响,并通过扫描电镜对银浆中银粉的分散状态进行了分析。结果表明:采用适量的超细球银与片状银粉复配,可以有效提高银浆的电导率和力学性能。当超细球银用量为6.6%(wt),片状银粉用量为65%(wt)时,银浆的电导率高达1.33×106S/m;与聚对苯二甲酸乙二醇酯基材具有良好的附着力,百格测试级别为5B;耐弯折性能优良,10次弯折测试后,电导率仍能达到3.38×105S/m。 相似文献
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以抗坏血酸为还原剂,在水溶液中还原银的前驱物制备超细银粉。考察了前驱物和分散剂种类以及分散剂用量对银粉颗粒形貌的影响。通过X射线衍射仪(XRD)和扫描电子显微镜(SEM)对银粉产品进行结构及形貌表征。结果表明:以硝酸银和银氨溶液为前驱物,随着PVP加入量的改变,银粉颗粒由树枝状向球形状转变,PVP加入量为30%时,制备出的银粉颗粒分散性好,球形度高,颗粒粒径为0.94μm。 相似文献
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为了制备相对较低固化温度银导电复合材料,采用AgNO_3为银源,液相还原法制备了球形超细银粉。导电复合材料主要由超细银粉和有机载体组成,并系统研究了制备工艺对银导电复合材料性能的影响。结合X射线衍射(XRD)、透射电镜(TEM)、扫描电镜(SEM)、热分析(DSC/TG)等分析手段,研究了银粉的晶体结构、形貌及导电复合材料的电性能、强度和形貌。结果表明,球形超细银粉的平均粒径为150 nm,粒径分布在50~200 nm,呈立方晶体结构。推荐最佳的导电复合材料制备薄膜工艺为:70%银粉、30%的有机载体,在150℃的温度下固化30 min,该薄膜的电阻率为5.2×10~(-4)?·cm。 相似文献
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在银电解生产过程中,电解液中Pd含量升高极易导致电解银粉中Pd含量超标,使产品品级降低,造成较大的经济损失。通过对G-01树脂进行吸附及解吸实验,论证其在生产中应用的可行性,通过实验表明该树脂对电解液中Pd的吸收具有极强的选择性,并且不改变电解液主要成分,对电解银粉生产过程不造成影响,具有较高的生产应用价值。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献