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经自来水污染后的无机陶瓷微滤膜再生方法研究 总被引:10,自引:3,他引:7
对无机陶瓷微滤膜进行了自来水污染后再生情况的研究,考察了单种清洗剂和混合清洗剂的清洗效果,并对清洗时间,清洗剂浓度,清洗温度对清洗效果的影响和清洗重复性进行了考察,得出有一定意义的结论。 相似文献
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本文以BEPC储存环上使用的四级质谱计粉列,说明了工作一段时间后清洗质谱管的必要性。文中讨论了清洗方法的细节,并用残余气体分析质谱图说明了清洗的效果。它对四极质谱计的用户如何仪器在重要的参考价值。 相似文献
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本文以BEPC储存环上使用的四极质谱计为例,说明工作一段时间后清洗质谱管的必要性。文中讨论了清洗方法的细节,并用残余气体分析质谱图说明了清洗的效果。它对四极质谱计的用户如何保养仪器有重要的参考价值。 相似文献
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用甲酸盐/柠檬酸盐制备(Sr1—xCax)TiO3微粉的研究 总被引:2,自引:0,他引:2
本文采用甲酸盐/柠檬酸盐溶液酒精脱水的方法制备出均匀的、结晶的、立方钙钛矿结构的(Sr1-xCax)TiO3微粉。借助于XRD、SEM、TEM及粒度分析等现代分析手段,研究了粉末的相结构、粒度、组成以及微观形态。研究表明,(Sr1-xCax)TiO3粉末的粒径和组成与溶液的pH值、熔烧温度、酒精与溶液的比例,以及酒精清洗、干燥步骤等因素有关。此外,还考察了粉末的烧结性能。 相似文献
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离聚物对PET/LDPE共混物的结构与性能研究 总被引:3,自引:0,他引:3
用双螺杆挤出机反应性挤出的方法合成了低密度聚乙烯接枝马来酸镧(LDPE-g-MALa)离聚物。与其它方法相比,该法具有工艺简单,易于工业化生产的特点。我们将离聚物与PET,LDPE在双螺杆挤出机上熔融共混挤出,并用注射成型机制备标准样条,对共混物力学性能进行了测试,发现离聚物有显著的增韧效果,另外,通过IR,DSC,溶解性实验,分子量的测定等还考察了离聚物对PET/LDPE共混体系的结构影响。 相似文献
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目的研究某产品在热处理后,表面存在的附着物对后续磷化膜质量的影响。方法将原热处理工艺中采用的三碱清洗剂更换为除油效果更好的MT-29清洗剂,用碱水清洗后,将一次热水洗改为连续两次热水洗,确保零件表面无异物。结果工艺改进前,磷化后的零件80%以上存在起皮现象,需要反复打磨,工艺改进之后,一次磷化通过率达到了100%,电泳涂漆质量满足产品要求。结论对成品热处理零件,三碱清洗剂对淬火油的清洗效果不佳,应采用专用的除油清洗剂;热水洗对成品热处理零件表面质量有一定的影响。 相似文献
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Dinh Son Nguyen Hong Seok Park Chang Myung Lee 《Materials and Manufacturing Processes》2019,34(4):455-461
The cleaning gas stream in a selective laser melting process is a crucial factor that functions to remove condensate and prevent oxidation during fusing. This study investigated the ejected powder during processing and the effect of cleaning gas flow on product quality in term of porosity. Our results showed that the flow rate of cleaning gas significantly affected the homogeneity of properties of manufactured products. Following the cleaning gas direction, the properties of manufactured parts were changed. The product characteristics when positioned closer the inlet gas were favorable, while reduced product quality was observed at a greater distance from the inlet gas. The results can be applied to the selective laser melting process to predict and diagnose the quality of printed parts. 相似文献
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目的针对焊前去除TiNi合金表面致密氧化膜过程中,传统方法会造成环境污染的问题,运用激光清洗这一绿色清洗方法去除TiNi形状记忆合金表面轧制氧化膜,并对其清洗工艺进行研究。方法运用OM和XRD等分析测试手段对激光清洗后TiNi合金表面进行测试,研究激光清洗工艺对TiNi合金表面氧化膜及其组织的影响。结果激光清洗参数对激光清洗效率影响较大,扫描次数对TiNi合金激光清洗效率具有饱和性;激光清洗过后的TiNi合金表面仍存在一定含量的TiO,TiO_2,Ti_3O_5等氧化物。结论激光清洗可得到表面明亮且均匀的TiNi合金,但不能完全清除TiNi合金表面氧化膜。 相似文献
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Changho Seo 《Particulate Science and Technology》2015,33(5):572-578
Recent studies demonstrated that laser-induced spray jet cleaning (LSJC) based on optical breakdown of a water droplet is an effective way to remove nanoscale contaminant particles from solid surfaces with use of small amount of water. In this work, an LSJC process using isopropyl alcohol (IPA) as a non-water cleaning agent was developed. High-speed spray jet composed of atomized micro droplets of IPA was generated by inducing optical breakdown in the droplet. The particle removal efficiency was slightly lower than that of the LSJC using water droplets but it was high enough to remove 30 nm polystyrene latex particles completely and 10 nm gold particles partially from silicon wafers. Optical microscopy and secondary ion mass spectrometry confirmed that the LSJC process using IPA caused no watermark problem commonly observed in water-based cleaning processes without a special rinsing and drying process. 相似文献
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Parametric studies have been carried out to determine the cleaning efficiency of a low-pressure microwave discharge at 2.45 GHz in Ar and O2. The prototypical problem of reduced cleaning efficiency inside deep bore holes is studied with modular 3D test substrates containing bore holes of different depths. The design of the substrates allows for a simplified access of surface diagnostic techniques to measure the mass removal depending on the aspect ratio of cavities.The cleaning effect is verified by the reduction of thin oil films or polypropylene samples situated at the bottom or sidewall of the substrate. Gravimetric and profilometric measurements are presented and the effect of process parameters (power, pressure, pulse duration, and gas mixture) on the removal rate of organic material from the surface is illuminated.Within the conditions under investigation pressures between 10 and 20 Pa lead to optimum results for an aspect ratio of 16.7 and absolute depths of 100 mm. While higher pressures lead to better cleaning at the surface, the removal diminishes greatly in deeper trenches, however, the cleaning efficiency in depth regions below 30 mm can be enhanced by choosing proper treatment parameters.The results suggest that the cleaning process under these conditions is dominated by chemical surface reactions and the transport of reactive species in the holes is strongly influenced by losses due to wall reactions. 相似文献
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针对船用碳钢表面富锌车间底漆清理需求,开展了激光除漆工艺试验,分析了搭接率、激光功率、扫描速度等工艺参数对清洗前后组织形貌、硬度及拉伸性能的影响规律,获得了船用碳钢激光清洗工艺窗口。结果表明,对于船用EH36钢,在25 W的低功率条件下,车间底漆清理效果十分有限。当功率提高到50~100 W,清洗2~3次后碳钢表面露出亮白金属色。随着扫描速度的减小,对材料表面的清洗会加强,甚至损伤。激光清洗会使样品表面出现熔化现象,改变样品的表面粗糙度,但是,不会显著削减样品的表面材料,对样品组织及力学性能几乎没有影响。该试验可为今后激光清洗工艺在船舶碳钢除漆的实际应用提供相应指导和参考。 相似文献
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目的为提高水基油墨清洗剂的环保性和稳定性,展开对水基油墨清洗剂的研究。方法分析清洗剂的清洗机理,选择多种表面活性剂进行复配实验,确定表面活性剂复配组成的配方及比例,利用配比实验确定助洗剂和防锈剂等助剂制备的工艺参数,再通过表面活性剂和助剂复配实验,优化油墨清洗剂的设计配方,确定水基油墨清洗剂的制备工艺路线。结果获得了水基油墨清洗剂的组成配方,水的质量为82 g,脂肪醇聚氧乙烯醚硫酸盐(AES)的质量为9 g,脂肪醇聚氧乙烯醚(AEO-9)的质量为2 g,氯化钠的质量为2 g,硅酸钠的质量为1 g,苯并三氮唑的质量为1 g,尿素的质量为2 g,三乙醇胺的质量为1 g。结论所配置的油墨清洗剂的净洗力、腐蚀性和防锈性等已达到规定标准,可制备性能稳定的水基油墨清洗剂。 相似文献