浸泡喷淋式前处理工艺在摩托车电泳线中的应用

介绍浸泡喷淋式前处理工艺在摩托车电泳线中的应用与工艺的现场管理。     

喷淋悬挂式前处理设备的设计计算

概括介绍了该设备的设计计算,给出了结构设计的常用参数以及喷嘴的性能参数和热力计算表,是一种行之有效的方法.     

电泳涂装生产线上件喷淋装置

公开（公告）号：CN201180160，公开（公告）日：2009．01．14，主分类号：C25D13／00（2006．01）l，分类号：C25D13／00（2006．01）l，申请（专利权）人：超煜电子科技（常熟）有限公司，地址：（215500）江苏省常熟市东南开发区银环路18号，发明（设计）人：王庭煜，专利代理机构：苏州创元专利商标事务所有限公司，代理人：范晴     

电器控制柜的常温涂装前处理

主要介绍了一种适合电器控制柜使用的常温涂装前处理工艺。该工艺根据电器控制柜的具体表面状态及材质，结合电控柜生产厂家的实际生产条件，在常温条件下，只需３个槽子即可完成除油、除锈、磷化、钝化４种工序，且 磷化膜在内的耐蚀期可高达１年以上。     

钢铁表面漆前处理现状及发展趋势

简要介绍我国钢铁表面涂漆前预处理的传统方法,综述目前漆前处理技术的现状,指出未来的发展趋势,文中提供的配方及工艺参数,对于研究和改进现有的漆前钢铁表面处理方法,探索新的处理工艺具有参考价值。     

施工前表面处理的注意事项

在涂装过程中,表面处理质量对涂层本身性能的影响比其他因素要大得多,因此,在防腐蚀施工中,要特别注意基材的表面处理过程。在表面处理过程中,需要注意的事项主要有：     

超声酸洗技术在涂装前处理中的应用

在涂装前处理中,为了加快处理速度和提高工作效率,因此超声清洗技术就广泛得到应用.阐述了超声波技术的工作原理--超声振荡的形成、作用机理,以及超声波设备.超声波技术的设备主要包括超声波电源(超声波发生器)和超声波换能器两部分.举例说明利用超声波技术在涂装前处理酸洗过程中的应用情况.随着涂装技术的发展和产品对涂装前处理要求会越来越高,超声波技术在涂装前处理(如除油、除锈、清洗等)中将会得到更加广泛的应用.     

涂装作业中现场管理对涂层质量的影响

通过对涂装实际生产过程中存在的现场管理问题,从技术角度详细地阐述了其对涂层质量的影响。强调了管理在涂装技术中的作用,具有一定的技术性和实用性。     

基于现场总线的锻造自动化生产线控制系统

锻造自动化生产线经历过如下几个阶段：单机设备自动化、生产线刚性自动化、生产线柔性自动化．而未来的发展趋势是必然数字化和智能化。单机设备自动化过分依赖人的参与．辅助时间长,加工效率低,产品质量与品质难以保障。生产线刚性自动化．     

In Situ Particle Behavior of Cast Iron Powder by Suspension Plasma Spraying

An important issue for atmospheric plasma sprayed metal coatings is the oxidation involved during processing that significantly affects its phase composition and microstructure and thus the overall coating properties. In this study, suspension thermal spraying was used to manufacture cast iron coatings with high amounts of graphite carbon as solid-lubricant, because graphite structure is considerably diminished in molten droplets of the spray material due to the dissolution into molten iron and/or the oxidation. Additional graphite formation based on the soot reaction of liquid hydrocarbon was observed. Oxidation strongly affects the soot reaction during suspension thermal spraying. Therefore, setting-up of a shroud around the plasma plume is quite effective to prevent the oxidation of hydrocarbon.     

玻璃粉浆水涂布自动生产线设计

介绍了自动生产线涂布作业的工艺流程．气动防自流喷涂头设计,多工位涂布机和自动涂布生产线的设计。分析了涂布作业起点与终点的选择以及设计制造应注意的问题。     

In Situ Synthesis of FeAl Dense Coatings by Very Low Pressure Reactive Plasma Spraying

With the purpose of elaborating high-quality FeAl coatings, a so-called very low pressure reactive plasma spray technique that combines very low pressure plasma spray and self-propagation high-temperature synthesis processes was used in the present study. A dense and homogeneous FeAl coating was thus successfully in situ synthesized by reactive plasma spraying of an Al/Fe₂O₃ composite powder under 1 mbar. The phase composition and microstructural features of the coating were characterized by XRD and SEM. Results indicated that the B2 ordered FeAl phase was synthesized, and the coating featured a dense and defect-free microstructure. The fracture mechanism of the coating remains mainly a brittle failure but the appearance of some dimples in local zones suggested some unexpected toughness.     

Investigations on the Initial Stress Evolution During Atmospheric Plasma Spraying of YSZ by In Situ Curvature Measurement

The residual stresses within plasma-sprayed coatings are an important factor that can influence the lifetime as well as the performance in operation. The investigation of stresses evolving during deposition and post-deposition cooling for atmospheric plasma spraying of yttria-stabilized zirconia coatings using in situ measurement of the samples curvature is a powerful tool for identifying the factors that contribute to stress generation. Under various spray conditions, the first deposition pass leads to a significantly larger increase in samples curvature than the subsequent passes. It is shown in this work that the amount of curvature change at the onset of spraying is significantly influenced by the spray conditions, as well as by the substrate material. More information on the origin of this steep curvature increase at the onset of spraying was obtained by single splat experiments, which yielded information on the splat bonding behavior under various conditions. A comparison of the compressive yield strength for different substrate materials indicated the influence of substrate residual stress relaxation. Residual stress measurements using the incremental hole-drilling method and x-ray diffraction confirmed that the coating deposition affects the substrate residual stress level. The yield strength data were combined with the substrate near-surface temperature during deposition, obtained by finite element simulations, and with the measured residual stress-profile. This revealed that residual stress relaxation is the key factor for the initial curvature increase.     

HVOF Spraying of Fe-Based MMC Coatings with In Situ Formation of Hard Particles by Hot Isostatic Pressing

Thick (2-3 mm) Fe-base coatings with admixed ferrotitanium (Fe₃₀Ti₇₀) were applied to austenitic steel by a high-velocity oxy-fuel process (HVOF). Hot-isostatic pressing (HIP) was carried out to the decrease porosity and to increase the material strength, wear resistance, and adhesive bond strength of the deposited coating to the substrate material. SEM and XRD investigations confirmed the formation of hard titanium carbide (TiC) particles during HIP treatment as a result of strong carbon diffusion out of the metal matrix and into the Fe₃₀Ti₇₀ particles. The mechanical and wear properties of the densified coatings were investigated by means of shear tests, hardness measurements, and abrasive wear tests. A comparison of the coatings in the as-sprayed and the HIPed state showed a large increase in the wear resistance due to in situ TiC formation.     

喷涂在铸造生产中的应用

通过设计实例论述涂料涂敷方法的确定原则及涂敷工艺选择、喷涂系统设计方案和主要配套设备的确定。     

喷涂工艺对Ta2O5原位复合钽基纳米晶涂层微观结构及摩擦磨损性能的影响

采用大气等离子喷涂制备了Ta₂O₅原位复合钽基纳米晶涂层,利用SEM、微束XRD、微动摩擦磨损实验机及非接触三维表面轮廓仪等技术手段并结合计算分析,考察了喷涂功率、主气(Ar)流量等对钽基涂层表面Ta₂O₅含量、晶粒尺寸、显微硬度和摩擦磨损性能等的影响规律及原因。在考察范围内,随喷涂功率增大,钽基涂层表面Ta₂O₅含量呈先减小后增大的变化,而涂层表面α-Ta的晶粒尺寸及点阵畸变则均呈先增大后减小的变化;随Ar气流量增大,涂层表面Ta₂O₅含量总体呈减小趋势,在流量为2.17×10^-3~2.33×10^-3m³/s时达到最低,α-Ta的晶粒尺寸与点阵畸变的变化呈负相关性;采用间断喷涂方法时涂层表面Ta₂O₅含量降低,α-Ta晶粒尺寸及点阵畸变均略有减小。通过对喷涂相关微观过程特点的分析,对这些规律作了阐释。涂层的显微硬度与其表面Ta₂O₅含量相关,高硬度涂层的表面Ta₂O₅含量相对较低;干摩擦条件下晶粒较大、Ta₂O₅含量较少的涂层抵御硬质陶瓷低速刻划的能力较差;边界润滑状态下硬度较高的涂层表现出更优的抗磨减摩性能;采取间断喷涂可获得摩擦学性能最佳的涂层。钽基涂层的机械性能与其微观结构特征显著相关;除显微硬度外,涂层晶粒尺寸、点阵畸变及表面Ta₂O₅含量的相对值可用作质量控制的重要指标。     

原位合成金属基复合材料

综述了原位合成金属基复合材料的研究现状、制备方法。     

原位合成方镁石-铁铝尖晶石材料

通过对铁铝尖晶石合成过程反应机理及MgO-Al_2O_3-FeOn三元体系中可能发生的高温反应进行热力学分析,尝试采用原位合成法制备方镁石-铁铝尖晶石材料,并用XRD、SEM等测试方法对材料进行了表征.结果表明:控制气氛10(-27117.9/T+11.54)＜Po_2＜10(-32625/T+18.09),经过1400, 1550 ℃高温处理后,能够成功合成出方镁石-铁铝尖晶石材料;同一温度下铁铝尖晶石的生成量随着金属铁加入量的增大而逐渐增多,1550 ℃处理后的试样FeAl_2O_4晶体发育更加良好.     

In Situ Production of Hard Metal Matrix Composite Coating on Engineered Surfaces Using Laser Cladding Technique

The growing need for high wear-resistant surface with enhanced physical properties has led to extensive researches in the field of surface engineering. Laser cladding emerged to be a promising method to achieve these objectives in a cost-effective way. The present paper studies the viability of cladding of tungsten disulfide (WS₂) powder by using 400 W continuous-wave fiber laser. WS₂ was used as a coating material, which was decomposed at higher temperature and underwent several chemical reactions. By this process, in situ formation of metal matrix composites and hard face coating on the substrate surface were attained. The characterization of laser cladded surface was done to study its morphological, microstructural, mechanical and tribological properties. It was observed that cladding of WS₂ powder on 304 SS resulted in the formation of Cr-W-C-Fe metal matrix composite having improved mechanical and tribological properties. The value of microhardness of the coated surface was found to increase three to four times in comparison with the parent material surface. Wear test results indicated a decrease in wear by 1/9th (maximum) as compared to the parent 304 SS surface. The volume fractions of tungsten particles on the cladded surface were also investigated through EDS analysis.