铝合金消失模涂料流变行为的研究

以自制的铝合金消失模涂料为基础,对消失模水基涂料的流变行为进行了深入研究。探讨了凹凸棒土水悬浮液及其在消失模水基涂料中的流变行为,结果表明凹凸棒土能大大改善消失模水基涂料的流变性。     

水基涂料及其湿法喷涂

我厂一直使用醇基型芯涂料,然后点火干躁,缺点是价格高,不安全,工作环境差。通过试验,我们配制了水基涂料。实际应用中,水的蒸发速度较慢,需要辅助干燥措施,结合我厂实际,我们找到了在原有的工艺条件下使用水基涂料的方法———湿法喷涂工艺。1水基涂料1.1水基涂料组成水基涂料     

砂型铸造水基快干/自干涂料的研究进展

分析了开发节能环保型水基快干/自干砂型铸造涂料的必要性,综述了国内外水基快干/自干砂型铸造涂料的研究进展,介绍了研制的新型水基快干/自干砂型铸造涂料的主要性能和使用效果.     

压铸水基涂料的润湿温度

早在六十年代,国外就对水基型的压铸涂料进行了大量的研究,将高性能,无污染的化工产品引入压铸涂料领域,使水基涂料获得迅速发展,先后在许多国家得到广泛应用。普遍认为水基涂料具有脱模性能好,冷却效果强,无污染,铸件表面光洁,能降低铸件气孔率等诸多优点,是较理想的压铸涂料。     

水基涂料及其湿法喷涂

铸造型芯用涂料,我厂一直以来均使用醇基涂料,然后点火干躁,缺点是价格高,有着火及爆炸的危险。通过试验,我们配制了水基涂料。实际应用中,水的蒸发速度较慢,需要辅助干燥措施。结合我厂实际,我们找到了在原有的工艺条件下使用水基涂料的方法———湿法喷涂工艺。1水基涂料1.1水基涂料组成水基涂料主要由耐火材料、分散悬浮剂、粘结剂、溶剂和其它附加物等组成。1.1.1耐火材料耐火材料是水基涂料的主要成分,其物理和化学性能在很大程度上决定了涂料的性能。我厂耐火材料选用铝钒土,原因[1]是:耐火度高,热膨胀系数小,烧结点适当,能烧结剥离。…     

消失模用新型水基快干涂料工艺性能的研究

分析了铸铁件消失模用新型环保水基快干涂料的涂层硬化性能。通过对比试验,研究了该涂料与普通铸铁件消失模用水基涂料在热风下的干燥速度、强度、抗吸湿性等性能。结果表明:铸铁件消失模用新型环保水基快干涂料的涂层,在热风烘干下的干燥速度超过国内同类产品;涂层热风干燥后强度高,抗裂性和抗吸湿性优异,透气性良好。     

金属型离心铸铁管硅藻土水基涂料的研制

介绍了金属型离心铸铁管硅藻土水基涂料中材料的选用及作用,并通过正交试验方法最终确定了符合生产要求的硅藻土水基涂料配方。     

无水水基镁橄榄石粉状涂料的研制与应用

本文介绍了水基镁橄榄石粉状涂料物化性能及工艺性能,尤其对实型铸造工艺专用无水水基镁橄榄石粉状涂料的研制过程、生产应用方法及应用效果进行了论证。     

DFS-1型压铸水基涂料试验研究

一、概述 随着压铸的发展涂料也不断更新。最初使用动物油,发展到矿物油为基的涂料。国外七十年代普遍采用水基涂料,我厂从八四年起开展压铸水基涂料试验研究,试成一种DFS—1型压铸水基涂料。八六年九月正式用于生产,使压铸件质量和产量提高到新的水平。现将试验和应用情况总结如下。 二、组成确定 我们研制十多种压型润滑材料,经过反复试验和生产验证,以正交优选法,试成一种DFS—1型压铸水基涂料,其组成确定如下:     

新型水基铸钢铸铁通用涂料的研究和应用

本文主要介绍一种新型水基铸钢铸铁通用涂料的组成、混制工艺、性能和使用效果,并对涂料中的耐火骨料的化学成分、相组织及其与煅烧温度的关系以及涂料的高温性能进行了研究。     

白炭黑偶联处理对硅橡胶性能影响研究

采用不同偶联剂对M-5气相白炭黑进行了表面改性,以增强白炭黑与硅橡胶的相容性.对处理前后的白炭黑进行了FT-IR分析,对比分析了偶联剂的类型和用量对气相白炭黑表面性能的影响,测试了室温硫化硅橡胶添加白炭黑后的力学性能.红外测试结果表明:偶联剂分子接枝到了白炭黑表面.表面改性效果最好的是乙烯基三甲氧基硅烷(Al71),白炭黑用量15%时硅橡胶拉伸强度最大可达到1.5MPa,由其配制的胶粘剂对铝-硅橡胶板的粘接强度达到1.3MPa.     

Gel electrolytes containing several kinds of particles used in quasi-solid-state dye-sensitized solar cells

Composite gel electrolytes containing several kinds of particles used as the quasi-solid-state electrolytes in dye-sensitized solar cells (DSSCs) were reported. Mesoporous particles (MCM-41) with unique structures composed of ordered nanochannels were served as a new kind of gelator for quasi-solid-state electrolytes. MCM-41, hydrophobic fumed silica Aerosil R972 and TiO2 nanopatricles P25 were dispersed into gel electrolytes respectively. The solar energy-to-electricity conversion efficiency of these cells is 4.65%, 6.85% and 5.05% respectively under 30 mW·cm-2 illumination. The preparation methods and the particles sizes exert an influence on the performance of corresponding solar cells. Owing to unique pore structures and high specific BET surface area, mesoporous silica MCM-41 was expected to have the potential to afford conducting nanochannels for redox couple diffusion.     

SiO2包覆对含微量CO氢环境中LaNi4.25Al0.75吸氢动力学性能的影响

采用气相二氧化硅法制备了LaNi4.25Al0.75/SiO2复合材料,研究了该复合材料表面形貌以及氢中微量CO对LaNi4.25Al0.75合金及LaNi4.25Al0.75/SiO2复合材料吸氢动力学性能的影响。结果表明：合金被毒化后,在表面生成含NiO、La(OH)3、La2O3、Al(OH)3的氧化层,并且吸附大量CO,导致合金的吸氢量减少,动力学变慢。表面包覆SiO2可显著改善合金抗毒化性能     

离心铸铁管硅藻土水基涂料组分的选择

介绍了金属型离心铸铁管所用硅藻土水基涂料的组分选取时所做的一些研究工作,强调了在涂料组分的选取时,不同产地的同一种材料在性能上存在较大差异,需要进行严格筛选。     

The effects of fumed silica and barite on the aluminum resistance of alumina castables

A study of the effects of microsilica and barium sulfate as additives in high-tabular alumina castables on cold and hot modulus of rupture, porosity, thermal shock, and corrosion resistance to aluminum attack is reported in this article. This investigation underlined the importance of the quality of fumed silica on the physical and mechanical properties of refractory castables, and also confirmed the importance of celsian formation during firing in the protection of refractory against aluminum attack. For more information, contact Saied Afshar, CIREP-CRNF, école Polytechnique de Montréal, 8475 Christophe-Colomb Street, Montréal, QC, H2M 2N9, Canada; e-mail saied.afshar@polymtl.ca.     

PREPARATION OF FERROFLUID FOR MINERAL PROCESSING AND ITS PROPERTIES

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Effect of reinforcement size on the scratch resistance and crystallinity of HVOF sprayed nylon-11/ceramic composite coatings

The high-velocity oxyfuel (HVOF) combustion spraying of dry ball-milled nylon-11/ceramic composite powders is an effective, economical, and environmentally sound method for producing semicrystalline micron and nanoscale reinforced polymer coatings. Composite coatings reinforced with multiple scales of ceramic particulate material are expected to exhibit improved load transfer between the reinforcing phase and the matrix due to interactions between large and small ceramic particles. An important step in developing multiscale composite coatings and load transfer theory is determining the effect of reinforcement size on the distribution of the reinforcement and the properties of the composite coating. Composite feedstock powders were produced by dry ball-milling nylon-11 together with 7, 20, and 40 nm fumed silica particles, 50 and 150 nm fumed alumina particles, and 350 nm, 1, 2, 5, 10, 20, 25, and 50 μm white calcined alumina at 10 vol.% overall ceramic phase loadings. The effectiveness of the ball-milling process as a function of reinforcement size was qualitatively evaluated by scanning electron microscopy+energy dispersive x-ray spectroscopy (SEM+EDS) microanalysis and by characterizing the behavior of the powder during HVOF spraying. The microstructures of the sprayed coatings were characterized by optical microscopy, SEM, EDS, and x-ray diffraction (XRD). The reinforcement particles were found to be concentrated at the splat boundaries in the coatings, forming a series of interconnected lamellar sheets with good three-dimensional distribution. The scratch resistance of the coatings improved consistently and logarithmically as a function of decreasing reinforcement size and compared with those of HVOF sprayed pure nylon-11. This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials Park, OH, 2006.     

水性超疏水复合涂料的制备及其机械稳定性

目的为了实现超疏水表面在实际生产生活中大规模应用,研制了一种具有大面积、低成本、可设计性和无有机溶剂等优点的水性超疏水涂料。方法以纳米级的气相二氧化硅和水性氟碳树脂为主要原料,以水为溶剂,通过氟硅烷疏水改性后获得了一种具有自清洁效应的超疏水涂料,借助场发射扫描电子显微镜、接触角测量仪、延时拍摄等手段对其进行了表征。结果该水性涂料可喷涂于各种软硬表面获得超疏水表面,其接触角均大于150°,滚动角均小于10°。水滴撞击实验表明,树脂增强的超疏水涂料经总体积为600 m L的连续水滴撞击后,其静态接触角依然大于150°,滚动角依然保持在10°以内。经砂纸打磨40周期后,水滴依然可以从其表面滚落。结论研制了一种以水为主要溶剂且价格低廉的水性超疏水涂料,将其喷涂于各种软、硬基底上均可获得均匀的超疏水涂层。该涂层还可以通过添加水性树脂来有效地增强其机械稳定性。     

超声表面加工和硫氮共渗复合处理对35CrMo钢表面性能的影响

为了同时减少钻杆接头和对磨套管的磨损,采用超声表面加工技术和硫氮共渗技术对钻杆接头材料35CrMo钢进行复合处理。利用光学三维形貌仪、扫描电子显微镜、EDS能谱仪、显微硬度计和X射线衍射仪分别研究了试样的表面形貌、粗糙度、成分、硬度和相结构,并在水基钻井液润滑条件下采用环块磨损试验机考察了35CrMo钢和套管对磨副的磨损性能。结果表明,超声表面加工可以使35CrMo钢和硫氮共渗复合处理改性层的表面粗糙度均显著降低,进一步提高硫氮共渗改性层硬度,显著改善35CrMo钢的耐磨性能,并使对磨副套管的磨损率明显降低,钻杆接头和套管的磨损表面形貌也得到显著改善。     

Effects of diamond size of CMP conditioner on wafer removal rates and defects for solid (non-porous) CMP pad with micro-holes

Wafer removal rates and defects were investigated for 200 mm tetraethyl orthosilicate (TEOS) oxide chemical mechanical planarization (CMP) processes using two types of CMP pads: a porous pad and a solid pad with micro-holes. An initial CMP test conducted with fumed silica based-slurry and a conditioner with 180 μm diamond revealed that the wafer removal rates by the solid pad with micro-holes were approximately 10% lower than those by the porous pad, but scratch type defects were reduced. In order to increase the removal rate of a solid pad with micro-holes to the comparable level of a regular porous pad without changing process parameters, it was decided to modify conditioner design by using different diamond size from 70 to 130 μm. It was found that wafer removal rates increased from 2973 to 2587 Å/min and defect counts reduced from 5.3 to 1.7 by decreasing the diamond size from 180 to 70 μm in the case of the solid pad with micro-holes. Various pad surface analysis results, including contact area estimation and microscopic observations, also revealed that a smaller diamond conditioner generated the pad texture with finer and more regular pad asperities.