共查询到20条相似文献,搜索用时 93 毫秒
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无铅建筑铝搪瓷的密着机理研究 总被引:1,自引:1,他引:0
采用扫描电子显微镜、电子探针等分析无铅建筑铝搪瓷界面的显微结构和元素分布,并结合铝搪瓷的密着强度,探讨了无铅建筑铝搪瓷的密着机理。结果表明,密着性能优良的无铅建筑铝搪瓷面存在铝元素与瓷釉元素相互扩散的中间过渡层;中间过渡层与金属铝的结合主要通过金属键来实现,中间过渡层与瓷釉层的结合主要是通过离子键和共价键来实现。 相似文献
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覆铝钢板搪瓷的底材化学处理 总被引:2,自引:2,他引:0
研究了覆铝钢板复合材料的表面化学状态与搪瓷密着性的关系,认为表面的组织状态与结构对搪瓷密着性有很大的影响。实验得出,铬浴处理后的覆铝钢板表面活性强,组织结构适合瓷釉元素的扩散,搪瓷界面过渡层宽度增加,密着强度提高。 相似文献
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0 引言 金属和瓷釉的组合扬长避短,就形成了搪瓷。它兼备了金属的强度和瓷釉的华丽外表以及耐化学腐蚀的性能。然而,金属和搪瓷是两种不同组成、不同结构性能各异的材料。金属与瓷釉的牢固结合是一个极其复杂的物理化学过程,加之同一材料在不同的条件下所表现的形式也会不同。对此学者们见解各异,众说纷纭,提出了不同的密着机理与机制。众所周知,搪烧前在钢板表面沉积一层镍或是过渡金属氧化物如CoO,NiO和MnO_22等,在适当的条件下,会与搪瓷钢板产生良好的密着。长期以来,国内外学者对钴镍底釉的密着机理作了很多研究。 Healy和Andrews研究表明含有氧化钻的搪瓷瓷釉能产生好的密着归功于被瓷釉溶解的钴和铁与瓷釉的亲密接触。Sweo和Pask强调CoO和NiO在瓷釉和金属密着中一个最 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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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献