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用导电云母替代富锌涂料中的部分锌粉,制备了含不同含量导电云母的抗静电耐腐蚀涂料,涂料经固化形成抗静电耐腐蚀涂层,测试了涂层的力学性能和抗静电性,采用盐雾、浸泡以及电化学等测试方法对涂层耐腐蚀性能进行了评价,并对涂层进行了防腐蚀机理的分析。结果表明:盐雾实验对涂层的抗静电性能影响不大。导电云母添加量为3%时,涂层阴极保护作用提高,并具有最佳的防静电性和防腐蚀性。 相似文献
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核-壳型有机硅-丙烯酸酸水乳涂料的合成与性能 总被引:1,自引:0,他引:1
研制了有机硅—丙烯酸酯水乳涂料,讨论了分散剂和增稠剂用量对涂料稳定性、单体含量对涂层的耐化学腐蚀性和抗冲性能影响及了助剂对涂层发花、针孔等性能的影响;并用红外光谱和透射电镜表征成膜物质的结构. 相似文献
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简述了砂型铸造水基自干涂料的自干固化机理,利用非等径球堆积原理分析并通过试验验证了涂料含水量与涂层自干固化时间的相互关系,通过对比试验研究了涂料耐火骨料粒度分布和颗粒形貌对涂层自干时间的影响规律及其原因。结果表明:涂料含水率与涂层自干时间呈近似线性变化关系;耐火骨料的粒度分布对涂层自干时间的影响显著,而粒径大小的影响很小;耐火骨料粒度取平均粒径为200~325目的正态分布为宜;耐火骨料的颗粒形貌也显著影响涂层自干时间,采用粒形为类似球形的粉石英制备的涂料含水率低,涂层自干固化快;厚度为0.5 mm的涂层在相对湿度为80%±2%的环境条件下,在100 min内能实现自干固化,有望满足华南地区高湿气候条件下的树脂砂铸造生产要求。 相似文献
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黄原胶对消失模铸造涂料性能的影响 总被引:3,自引:0,他引:3
为提高消失模铸造水基涂料的质量,探讨了黄原胶作为微量添加剂对涂料性能的影响.试验研究表明,铸造涂料中加入适量的黄原胶可提高悬浮性、显著增大涂料粘度和涂挂性、改善涂料的流变行为.黄原胶还可显著提高涂层的强度,但使涂层透气性略有降低.鉴于黄原胶的优异性能,可望在消失模铸造水基涂料中获得应用. 相似文献
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TiN涂层电化学腐蚀行为研究Ⅱ.添加Al对TiN涂层保护性能与失效机制的影响 总被引:2,自引:0,他引:2
利用电化学方法以及扫描电镜 (SEM)、扫描隧道显微镜 (STM )技术等 ,研究了添加Al对离子镀TiN薄膜涂层在 0 5mol/LNaCl和 1mol/LH2 SO4溶液中的保护性能和失效机制的影响 ,发现铝的添加使TiN涂层在中性和酸性溶液中的耐蚀性能明显改善 .Al元素对TiN涂层具有自修复作用 相似文献
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论述了汽车涂装生产线中输送工件常采用的悬挂式推杆链、双摆杆式输送链各自工作原理、特点,进一步对涂装生产线中的同步问题进行了探讨。特别对目前在汽车涂装生产线上积极倡导的Rod-dip和Vario Shuttle多功能穿梭机输送装置进行了较为细致的分析。 相似文献
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0IntroductionThrough the effortof more than20 years, the usabilityof stainless steel electrode has gained great success in ourcountry. However compared with famous brand products a-broad, we have a long way to go[1 -2]. Sometimes the elec-trode coating changes into red and crack, blowholes comeout, and slag detachability isn’t well while welding.The blowholes in stainless steel electrode are mainlycarried by hydrogen. So they are related with the origin ofhydrogen, melting point and viscosit… 相似文献
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In this work, the thermally induced cracking behavior of a segmented coating has been investigated. The geometry under consideration is a hollow cylinder with a segmented coating deposited onto its outer surface. The segmentation cracks are modeled as a periodic array of axial edge cracks. The finite element method is utilized to obtain the solution of the multiple crack problem and the Thermal Stress Intensity Factors (TSIFs) are calculated. Based on dimensional analysis, the main parameters affecting TSIFs are identified. It has been found that the TSIF is a monotonically increasing function of segmentation crack spacing. This result confirms that a segmented coating exhibits much higher thermal shock resistance than an intact counterpart, if only the segmentation crack spacing is narrow enough. The dependence of TSIF on some other parameters, such as normalized time, segmentation crack depth, convection severity as well as material constants, has also been discussed. 相似文献
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PVD涂层技术制备类金刚石薄膜及性能研究综述 总被引:1,自引:1,他引:0
介绍了采用物理气相沉积(PVD)技术制备类金刚石涂层的方法,进而论述了涂层的摩擦磨损和结合力等性能的研究现状和发展前景。分析并综述了类金刚石涂层的技术发展,以及制备类金刚石薄膜的方法和影响其性能的多种要素。表面涂有类金刚石薄膜的工件具有较高的硬度、良好的热传导率、极低的摩擦系数、优异的电绝缘性能等。类金刚石薄膜(DLC Films)是近年来兴起的一种以sp3和sp2键的形式结合生成的亚稳态材料,因其优异的减摩和抗磨性能,在摩擦学领域获得了广泛应用,是一种与金刚石涂层性能相似的新型薄膜材料。DLC涂层的性能研究大多集中在它的摩擦学特性和结合力性能,并且作为优质的涂层材料已被广泛应用于汽车、模具、刀具等领域。 相似文献
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Carlos R. Fadragas E. V. Morales J. A. Muñoz I. S. Bott C. A. Lariot Sánchez 《Journal of Thermal Spray Technology》2011,20(6):1183-1191
A Cu-Al alloy has been used as bond coat between a carbon steel substrate and a final coating deposit obtained by applying
the twin wire electric arc spraying coating technique. The presence of a copper-based material in the composite system can
change the overall temperature profile during deposition because copper exhibits a thermal conductivity several times higher
than that of the normally recommended bond coat materials (such as nickel-aluminum alloys or nickel-chromium alloys). The
microstructures of 420 and 304 stainless steels deposited by the electric arc spray process have been investigated, focusing
attention on the deposit homogeneity, porosity, lamellar structure, and microhardness. The nature of the local temperature
gradient during deposition can strongly influence the formation of the final coating deposit. This study presents a preliminary
study, undertaken to investigate the changes in the temperature profile which occur when a Cu-Al alloy is used as bond coat,
and the possible consequences of these changes on the microstructure and adhesion of the final coating deposit. The influence
of the thickness of the bond layer on the top coating temperature has also been also evaluated. 相似文献
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Effects of coating constituent, coating density, coating layer thickness and temperature on coating sorption capacity for polystyrene decomposition products have been studied systematically. It has been found that the effect of attapulgite clay on sorption capacity is the largest among coating constituents. The sorption capacity of the coating with 2 %attapulgite clay is elevated by 81%. The relationship between casting porosity and coating sorption capacity has been studied. It has been pointed out that higher coating sorption capacity for polystyrene decomposition products is helpful to decrease the casting porosity. Results also show that the sorption capacity of self- developed HW- 1 coating for polystyrene decomposition products is as good as that of Ashland coating from America. 相似文献
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运用美学、人类工效学、绩效理论,以及黄金分割原理的设计理念优化设计制作4102气缸盖砂芯整体涂料工艺及夹具。对气缸盖砂芯整体涂料工艺的确定,及其整体涂料夹具的旋转框架、夹紧气缸的密封、定位导柱、电动及手动摆料机构等主要零部件的结构优化设计进行了较详细的评述;所用的优化设计理念,也可指导其它铸造工装的优化设计。 相似文献
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高温自蔓延合成复合涂层的研究现状 总被引:1,自引:0,他引:1
高温自蔓延合成技术因其节约能源、生产效率高、投资少、产品纯度高等特点,已用于制备特种性能陶瓷,是一种潜在的制备高性能涂层的方法 .介绍了由传统高温自蔓延合成技术延伸发展起来的自蔓延铸造涂层技术、自蔓延气相传输涂层技术、自蔓延烧结涂层技术和自蔓延反应喷涂涂层技术,重点分析了各种自蔓延合成涂层技术的基本原理、工艺特点、涂层特点、应用情况、研究现状及存在的主要问题.针对自蔓延合成涂层技术存在的问题,如孔隙率高(一般达5%~20%)、结合强度差(低于50 MPa)、反应速度快、过程难以控制等,提出了高温自蔓延合成复合涂层技术的研究方向:优化反应体系组分设计,设法避免低气化点反应生成相的形成,减轻自蔓延合成反应过程中的飞溅;加入添加剂延长液态停留时间和增强液相流动性;选择反应生成相与相之间以及生成相与基体金属都具有良好润湿性的反应体系;优化涂层结构设计,设计复合结构和梯度结构的涂层体系,提高涂层与金属基体的结合质量. 相似文献