共查询到20条相似文献,搜索用时 93 毫秒
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综述激光表面改性在各种表面处理技术方面的应用情况,列举了激光表面改性处理的机理和工艺及其效果。 相似文献
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综述了堆焊、热喷焊、热喷涂、激光表面改性等技术在球墨铸铁热轧辊修复过程中应用的优缺点及研究进展,对表面强化技术未来的发展趋势进行了分析和展望。 相似文献
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激光是高能束加工的新型能源之一。激光加工技术具有清洁、环保、高效及易于实现自动化的优点,应用十分广泛。介绍了激光技术在电镀、化学镀、气相沉积、材料表面改性及精饰加工中的应用,简要分析了激光表面处理加工的特点及存在的问题,指出激光在表面工程技术领域应用的广阔前景。 相似文献
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综述了国内外聚四氟乙烯(PTFE)表面亲水改性的研究进展,主要介绍了湿化学处理、低温等离子、辐射接枝、激光处理等方法在PTFE表面改性方面的应用情况,简要叙述了各改性方法的优缺点,并对PTFE表面改性的发展前景进行了展望. 相似文献
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脉冲激光改性聚氨酯表面无钯化学镀铜的实验研究 总被引:1,自引:0,他引:1
提出了一种在改性聚氨酯(PUR)材料表面进行金属化的方法。以掺杂了铜基金属复合物粉末的PUR浆料为基体,采用SPI光纤激光器(波长1 064 nm)对PUR表面进行刻蚀改性,达到传统化学镀铜中粗化和活化的目的,最后进行化学镀铜。对铜镀层进行了结合力、导电性以及延展性测试。结果表明,制备的铜镀层光亮、致密、结合力强、导电性好、延展性优良。通过扫描电子显微镜、X射线能谱仪、X射线光电子能谱(XPS)分析和俄歇电子能谱(XAES)分析对经过激光刻蚀改性的基体表面形貌和成分进行表征。探讨了激光刻蚀改性材料表面后,基体表面上铜元素的价态,分析XPS图谱和XAES图谱发现,激光刻蚀改性后的基体表面上铜元素以Cu+形式存在。研究了不同激光功率对刻蚀表面粗糙度的影响规律,通过胶带拉力实验验证了基体表面形貌与镀层结合强度的关系,实验结果表明,当用功率为7 W的激光刻蚀基体表面时,材料表面粗糙度值最大,并且其镀层结合力也最强。 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