水基胶覆膜机覆膜系统试验与分析

覆膜系统设计是设计环保节能型覆膜机的技术关键。通过对典型的3种涂布方式比选,并进行正交实验,测定其胶层厚度变动系数CD,得出涂布方式对厚度变动系数的影响;复膜压合质量实验方法采用正交分级实验方法,得出复合压力及涂布量对疵斑点率的影响。最终确立覆膜系统主要参数以及系统方案。     

逆转辊涂布间隙的计算机控制系统研究

为实现涂布间隙的自动精确调整，提高涂布质量，以差动螺旋微调节机构为研究对象，首先建立系统的数学模型，然后进行了误差分析和调节流程分析，并且在PMAC控制器中嵌入积分分离的PID控制算法，用来改善系统的控制性能．仿真结果验证了此方法的有效性．     

可逆温致变色涂布防伪包装纸及其防伪性能研究

对低温可逆温致变色水性涂料配方、影响涂料配方的诸多因素进行了系统研究,并对不同配方涂料涂布于纸张上形成的可逆温致变色涂布纸张的防伪性能进行了探讨,为开发从纸张内部到纸张涂层综合防伪的防伪纸产品提供了技术理论依据.     

板坯连铸中间包内气液两相流数值模拟

模拟研究了中间包上使用狭缝式透气砖条件下,连铸中间包内气体体积分布和流场.结果表明,狭缝宽度和气体流量对气幕挡墙的形成影响显著;气体流量约为10 m3/h时,中间包内钢液的流动特性较好.     

天光泽涂料印刷纸的研制

全部采用国产原材料研制出无光泽涂料印刷纸Ａ型和Ｂ型，并根据无光泽需要增大光的散射原理，通过正交试验，寻求数种颜料的最佳搭配和数种胶粘剂比例，制定出涂料配方，并对涂布工艺进行了分析讨论。     

顶部定常吸气对高层建筑模型气动力的影响

为减少高层建筑受到的风荷载,提高高层建筑抗风性能,提出一种顶部吸气的主动控制方法。在一高宽比为H/d=5的正方形截面柱体的高层建筑模型上,通过在其顶部前边缘开设狭缝进行吸气来实现流动控制。通过风洞试验研究了顶部吸气对气动力与顶部分离流的影响.利用流动可视化与流场测试结果揭示了顶部狭缝吸气的控制机理.实验对比了不同吸气系数Q(=U/U_∞,U为狭缝吸气速度)对气动力控制效果的影响,并对Q=0,1和3的三种工况下风压分布与顶部剪切流进行了详细对比.研究发现狭缝吸气改变了顶部分离流特性,并对模型所有高度上的气动力均有显著影响.Q=1时控制效果最佳,脉动阻力与脉动升力分别减小17.8%和45.5%.此时顶面分离流被削弱并伴随有再附现象且湍流强度较大,最有利于顶部剪切流与尾流间的动量交换,从而削弱柱体展向涡脱落与脉动气动力.     

无光泽涂料印刷纸的研制

全部采用国产原材料，研制出无光泽涂料印刷纸Ａ型和Ｂ型；并根据无光泽需要增大光的散射原理，通过正交试验，寻求数种颜料的最佳搭配和数种胶粘剂比例，制定出涂料配方，并对涂布工艺进行分析讨论．     

重质碳酸钙涂布适应性研究

对国产眉县重钙和进口英国涂布级重钙的涂布适应性进行了比较,并对涂料配方的计算机优化方法进行了初步研究．结果表明：重质碳酸钙可以一定比例配合进口瓷土用于底涂;重钙配比提高,有利于提高涂层亮度和拉毛速度,但可能造成光泽度和印刷光泽度下降;采用计算机优化技术进行配方的优化研究是可行的．     

二维狭缝内波动基频共振频率的解析分析

针对波浪作用下二维狭缝内水体波动问题,通过无量纲化的Laplace方程对狭缝内水体波动形式进行简化,将狭缝内水体波动问题转化为波浪对单浮体的作用问题。应用线性势流理论讨论了波浪作用下狭缝内水体共振的机理,利用特征函数展开方法对狭缝内水体波动的共振频率进行了计算与分析。计算结果在狭缝宽度较小时,与基于线性势流理论的半解析方法、比例边界元方法、渐进匹配方法以及简化分析的结果相比,具有相同的变化趋势和数值;在狭缝宽度趋于0时,得到相同的共振频率渐进表达式。在狭缝宽度较大时,在趋势和数值上均与基于线性势流理论的半解析方法的结果吻合,与渐进匹配方法以及简化分析的结果变化趋势相同,数值上有差异。结果表明,该方法可以更广泛地应用于二维狭缝内波动基频共振频率的求解。     

水性环氧型光敏树脂的合成及在纸张中的应用

以环氧树脂、丙烯酸、马来酸酐为原料合成水性光敏树脂。讨论了催化剂用量、反应温度、反应时间等因素对合成水性光敏树脂性能的影响。并初步研究了其在纸张湿部添加中的应用工艺,对其影响因素进行了讨论。结果显示：经过水性光敏树脂涂布后,纸张的物理性能得到了明显的改善。     

空间太阳电池自动封装机器人的涂胶过程

为了提高空间太阳电池的封装质量,对自动封装机器人的注射器涂胶过程进行了建模与分析.基于非牛顿流体理论,建立了盖片胶的圆管流动模型,并使用有限元软件Ad ina进行了数值计算.根据理论模型求解出了针头段的速度场,同时得到了模型的数值解,二者进行了对比验证.从而获得了圆管流动出口流量的精确解,用于下一过程———平面扩散中盖片胶初始形状的计算.涂胶过程中的参数,包括:盖片胶粘度、注射器入口压强、针头直径,影响着涂胶量,进而影响着最终的封装质量.     

新型铸钢醇基涂料的研究

以红柱石为耐火骨料,并合理选择烧结助剂等其它组分,研制了新型铸钢醇基涂料。试验表明,新型铸钢醇基涂料涂层中的红柱石粉在铸钢浇注温度(1 550℃)作用下,生成大量的高熔点莫来石相,使得该涂料层具有了良好的抗粘砂效果,浇注的铸件表面光洁,不粘砂,易清理,劳动强度低,且悬浮性、涂刷性、流平性及抗流淌性等工艺性能优良,同时与锆英粉涂料相比成本低廉,适用于各类型碳钢及中小型合金钢铸件。     

Investigation on plasma-sprayed ZrO_2 thermal barrier coating on nickel alloy substrate

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Enhancing ductility of the Al-Si coating on hot stamping steel by controlling the Fe-Al phase transformation during austenitization

In this study,austenitizing heat treatment before hot stamping of Al-10%Si coated boron steel is first investigated through environment scanning electron microscopy(ESEM)equipped with energy dispersive x-ray analysis(EDAX).The cracking behavior of the coating was evaluated using Gleeble 3500,a thermo-mechanical simulator under uniaxial plastic deformation at elevated temperatures.The extent and number of cracks developed in the coating were carefully assessed through an optical microscope.The coating layer under hot-dipped condition consists of an Al-Si eutectic matrix,Fe2Al7Si,Fe3Al2Si3 and Fe2Al5,from the coating surface to the steel substrate.The coating layer remains dense,continuous and smooth.During austenitization,the Al-rich Fe-Al intermetallics in the coating transform to more Fe-rich intermetallics,promoted by the Fe diffusion process.The coating finally shows the coexistence of two types of Fe-Al intermetallics,namely,FeAl2 and FeAl.Microcracks and Kirkendall voids occur in the coating layer and diffusion zone,respectively.The coating is heavily cracked and broken into segments during the hot tensile tests.Bare steel exposed between the separate segments of the coating is oxidized and covered with a thin FeOx layer.The appearance of the oxide decreases the adhesion of the Al-Si coating.It is found that the ductile FeAl is preferred as a coating microstructure instead of the brittle FeAl2.Therefore,the ductility of the Al-Si coating on hot stamping boron steel could be enhanced by controlling the ductile Fe-rich intermetallic phase transformations within it during austenitization.Experiments indicate that a higher austenitizing temperature or longer dwell time facilitate the Fe-rich intermetallics transformation,increasing the volume fraction of FeAl.This phase transformation also contributes to reducing the crack density and depth.     

THE CURING THEORY OF SILlCONE PAINT AND THE STRUCTURE OF COATING FILM

This paper puts forward the two methods ofweightlessness and alkoxyl group contentdetermination to calculate the amount of cross-linking agent after elaborating the curing essence ofsilicone paint under the action of catalysis,andprovides the theoretical basis of fixing the amoountof cross-linking agent accurately and quantitatively.At the same time,the structure of coating film isstudied by the use of photoelectronic spectromenterand some other modern technology,and verified intheory.At last,this paper analyses the layerstructure and the relationship between it and thecoating properties.     

分光光度法评价低固含量颜料及涂料的稳定性能的研究

颜料与涂料的稳定性对涂布过程和涂布纸的质量有较大影响,但现有的稳定性能研究方法不能满足生产需要.作者介绍了一种新的颜料与涂料的稳定性能研究方法——分光光度法,采用此方法探讨了颜料配比、PVA、淀粉及CMC用量对涂料稳定性的影响.分光光度法采用线性回归,对测试样品进行离心处理,采用722分光光度计测定上层液体的浓度,通过比较上层涂料的浓度得知被测样品的稳定性能.研究表明,采用分光光度法测定低固含量和低黏度涂料的沉降稳定性是可行的.     

8407模具钢表面渗铝的研究

为了防止模具表面产生热疲劳裂纹,通过冷喷涂在8407钢试样表面形成了一层铝涂层,再进行扩散处理,在试样表面形成了渗层.通过理论分析确定低温渗铝的工艺参数,并与渗铝实验进行检验,重点研究了扩散温度和扩散时间对渗层质量的影响.结果表明,8407钢经过冷喷涂铝后再进行扩散处理能够实现低温渗铝.在550℃下扩散4 h左右形成的渗层质量比较理想.     

Microstructure and electrochemical behavior of laser cladded HA coating on pure titanium TA2

Hydroxyapatite (HA, Ca10(PO4)6(OH)2) coating was fabricated on pure Ti (TA2) by laser cladding technology. The phase structure, microstructure, microhardness and electrochemical behavior of the laser cladded HA coating in artificial body fluid were investigated. The results show that the HA coating is mainly composed of highly crystallized HA. A transitional layer between HA coating and Ti substrate is formed. Microhardness measurement shows the gradually increasing of microhardness from 150 HV at TA2 substrate to 600 HV at transitional layer, and followed by a decreasing to 400 HV at HA coated layer. Electrochemical corrosion tests show that the HA coating has higher open circuit potential , lower corrosion current density and corrosion rate in comparison to the TA2 substrate.     

高温陶瓷复合涂层的组成与设计

概述了多功能先进高温陶瓷复合涂层的组成与结构,即梯度涂层、多层涂层和多相涂层 结构．在分析的基础上,以喷管梯度涂层、耐高温侵蚀的陶瓷多层涂层为对象,应用数学 方法和有限元分析方法,对涂层物理机械性能进行优化设计,指出了优化设计是高温陶 瓷复合涂层的主要发展方向．     

Thermal residual stress analysis of diamond coating on graded cemented carbides

Finite element model was developed to analyze thermal residual stress distribution of diamond coating on graded and homogeneous substrates. Graded cemented carbides were formed by carburizing pretreatment to reduce the cobalt content in the surface layer and improve adhesion of diamond coating. The numerical calculation results show that the surface compressive stress of diamond coating is 950 MPa for graded substrate and l 250 MPa for homogenous substrate, the thermal residual stress decreases by around 24% due to diamond coating. Carburizing pretreatment is good for diamond nucleation rate, and can increase the interface strength between diamond coating and substrate.