水泥混凝土道面填缝料——M880密封膏

本文介绍水泥混凝土道面填缝料—M880密封膏的组成、反应机理、工艺配方和性能以及某些因素对密封膏性能的影响。产品已应用于混凝土道面接缝密封,效果良好。     

曹妃甸1号桥钢筋混凝土结构防腐涂装工艺及质量控制

介绍了唐山曹妃甸1号桥钢筋混凝土结构防腐涂层体系的选择、涂层体系的性能特点、施工工艺要求和涂装质量控制,对北方滨海地区桥梁钢筋混凝土结构的防腐防护涂装有一定的借鉴意义。     

混凝土桥梁结构表面涂层防腐技术（二）

介绍了钢筋混凝土结构涂层体系性能要求和技术指标.归纳了7种典型的涂层配套体系,介绍了它们的性能特点、防腐年限和适用的腐蚀环境.论述了我国混凝土桥梁防腐涂装实践,展望了混凝土结构表面涂层材料的发展趋势:高性能化、无溶剂化和水性化.     

含氟高分子材料聚四氟乙烯及其填充材料的应用

本文介绍了聚四氟乙烯的制备方法及结构性能特点,并列举了聚四氟乙烯及填充材料在医疗卫生、防腐零件及密封装置、电子电器工业制品、防粘用品领域的广泛用途。     

桥梁结构腐蚀环境分析及其涂装技术进展

重点分析了桥梁结构的大气、水、土壤腐蚀环境和腐蚀特点,介绍了桥梁防腐涂装技术、通用桥梁钢结构和混凝土防腐配套体系及现代化桥梁涂装施工技术。     

建筑密封膏的国内外现状(上)

本文概述了目前国际上密封材料总的发展趋势,分述了沥青基密封膏、油性密封膏、水性丙烯酸酯密封膏、聚氨酯密封膏、聚硫密封膏和硅酮密封膏等建筑密封膏的国内外发展状况。     

桥梁防腐标准及防腐涂层配套体系设计

介绍了我国桥梁防腐涂装材料的发展简史和相关防腐涂层配套体系设计标准。为了规范桥梁防腐涂装技术,新制订了三部交通行业标准：JT/T722—2008《公路桥梁钢结构防腐涂装技术条件》、JT/T694—2007《悬索桥主缆系统防腐涂装技术条件》、JT/T695—2007《混凝土桥梁结构表面涂层防腐技术条件》。介绍了采用这三部标准进行桥梁钢结构、混凝土结构和主缆系统配套涂层体系设计的一般原则。     

桥梁盖板用的锌铝聚氨酯防锈漆

铁路桥梁盖板是桥梁结构中的一个很重要部位,其表面防腐好坏直接关系到桥梁使用寿命。很多桥梁就是由于盖板腐蚀严重而不得不进行大修或改建。盖板的防腐措施多年来一直沿用涂漆方法。由于油漆防腐效果不佳,需要经常涂漆,每涂一次均要一根一根移动枕木,需要很多人力物力,有时甚至影响火车正常运行,盖板的防腐措施实为急待解决的问题。     

新型滑环式组合密封

由徐州市同宝特种橡塑密封制品厂研制开发的新型滑环式组合密封(车氏密封),最近在徐州通过了江苏省科委组织的技术鉴定。车氏密封在现有国内外密封技术的基础上,创造性地采用了Ｏ型圈与薄唇滑环的组合设计,结构新颖、合理、耐腐蚀与密封性能优良、摩擦阻力小、适应性强、尤其在渗透性强的气体,如氧、氩、氢、氦的密封防腐问题上,填补了国内的空白,达到了世界先进水平新型滑环式组合密封@江镇海     

造粒机辊轮密封系统的改造

分析了密封结构、工作介质腐蚀性、粉体静压力对造粒机辊轮组合密封的影响,讨论了组合密封中迷宫密封与唇形密封的失效原因,给出了迷宫密封结构和密封方向的改进方案、唇形密封装配的方法及环形压紧弹簧材料的改造措施,以及静轴的防腐措施及其加工要求。     

Effects of solid loading on joining and thermal cycling performance of glass-ceramic sealing pastes for solid oxide fuel cells

The variation of the joining performance of glass-ceramic sealants in the form of a paste as a function of the solid powder content in the sealing paste after the formation and a number of thermal cycles are experimentally studied. Three different sealing pastes having 40, 50 and 60 wt % solid loadings are prepared and tested for this purpose. The pastes are applied between two metallic interconnector plates and subjected to a glass formation step for the joining. The fracture strengths of 24 samples prepared for each case are determined via tensile tests. Similarly, the mechanical performances of the sealants after 3, 6 and 9 thermal cycles are also obtained. The results reveal that the joining strength tends to increase with the amount of solid powder content in the paste. This can be attributed to increased number of crystalline phases in the sealants with increasing the solid loading. The thermal cycles, on the other hand, are shown to have an adverse effect on the joining performance regardless of the solid loading. However, the rate of decrease in the fracture strengths is found to decrease with the solid powder contents in the pastes. This can be elucidated by the amount of glassy phases in the sealants, which can be expected to increase with the solid loading and provide self-healing ability. The microstructures of the fracture surfaces of all samples are also investigated by a scanning electron microscopy. The obtained images confirm the tensile test results.     

一种新型炭素挤压机恒温压头简介

针对炭素挤压机现有压头存在问题:压头散热严重,料室内糊料温度不均匀;料室内壁磨损严重;后压头回程时压头与糊料之间有粘连等进行分析,开发了一种新型炭素挤压机恒温压头.新型恒温压头利用电热管和热电偶将温度控制在一个恒定值,减少了炭素糊料热量损失,实现了等温挤压,避免了压头回程时压头与糊料之间的粘连现象,提高了挤压制品质量.     

低迁移量环保食品罐密封圈的制备及其性能研究

以聚氯乙烯（PVC）糊树脂、Dinch增塑剂、聚酯增塑剂等其他助剂制备低迁移量环保密封圈。研究了PVC糊树脂的聚合度、发泡剂含量、加工温度和胶料存放时间对密封圈耐迁移性能的影响。结果表明,在聚合方法相同、颗粒形态相近的条件下,随着PVC糊树脂聚合度的提高,树脂吸收增塑剂的能力变强,密封圈的耐迁移性能随之提高;随着添加的发泡剂含量的增加,密封圈的泡孔变大且数量增加,与模拟液的接触面积变大而导致增塑剂迁移量变多;加工温度为195 ℃时制备得到的密封圈的增塑剂迁移量较少,加工温度过高或者过低会使密封圈部分结构受到破坏或者塑化程度过低,体系内游离的增塑剂含量较多;随着胶料存放时间的延长,密封胶的稳定性降低,密封圈的耐迁移性能随之降低。     

Wachse für die interne Versiegelung von Beton

Waxes for the Internal Sealing of Concrete The chloride resistance of concrete is essentially improved by the internal sealing of concrete with wax. Thus damage by corrosion of the reinforcing steel can be reduced and splitting off by frost and thawing salt can be prevented. Possibilities for application for the internal sealing of concrete are given with regard to the construction of bridges, in the production of concrete finished parts and for waste water. Recent test results show that the internal sealing of concrete lead to an increase of the sulfate stability.     

在模拟井下环境中堵剂的结构形成与失效机理

采用XRD，TG和SEM－EDS等研究了在模拟油井深处温度，压力条件下养护的G级油井水泥和YLD型堵漏剂浆体的水化产物和显微结构。在高温高压动态养护条件下，硬化水泥浆体内部存在大量CSH凝胶和Ca(OH2)晶体，而堵漏剂浆体的主要水化产物是CSH凝胶。在钢管－浆体界面，虽然水化程度更高，但CSH凝胶和Ca(OH)2晶体的量却很少；主要的水化产物是钙矾石和水化钙黄长石。界面处的显微结构也比浆体内部疏松。这表明在钢管－浆体界面处存在严重的溶蚀现象，导致水泥浆体很快损失胶凝性，这可能是水泥基堵剂失效的主要原因。堵漏剂浆体的溶蚀速率小于油井水泥浆体，其溶蚀表面可发生再水化过程，新生成的CSH凝胶具有修补受损界面的“自愈”作用，使堵漏剂浆体与钢管的粘结作用得以维持，从而延长堵漏剂的有效使用期。     

Upscaling of asymmetric hollow fiber-supported thin film membranes for oxygen separation from air: Proof of concept

Hollow fiber membranes demonstrate various advantages for high performance oxygen separation. However, the small diameters of hollow fibers and the brittleness of ceramics limit their mechanical strength, imposing great difficulties on stack and module development. Gas-tight sealing is another challenge for upscaling of hollow fiber membrane technology. Low temperature sealant materials of epoxy resin or silicon are typically used for hollow fiber stacks, requiring that the sealing portions be located out of hot zone. Consequently, only partial length of hollow fibers participates in oxygen permeation. In this study, upscaling of our recently developed asymmetric hollow fiber-supported thin film membranes is conducted, where individual hollow fibers are assembled in parallel to form a stack. A reliable gas-tight sealing is obtained by combining ceramic paste with conductive adhesive ink cohesively. Comprehensive oxygen permeation test is conducted with the sealing portions being in hot zone and compared with a single hollow fiber membrane. Fundamental mechanism is discussed to understand the performances and their differences. An accelerated long-term test (∼320 h, 16 thermal cycles) demonstrates excellent stability and robustness of the stack and sealing. The characterization of post-test samples further confirms excellent stability and robustness of the phases and microstructures of the stack.     

Enhancement of hybrid sol–gel coating and industrial application on polished porcelain stoneware tiles and investigation of the performance

The aim of this study was to improve stain resistance and cleanability of polished porcelain tiles by sealing the micro-pores on the tile surface with hybrid sol–gel solution. For this purpose, solutions of a hybrid system based on sol–gel technology were prepared. The obtained solution were applied to polished unglazed tiles and subsequently spread with soft tissue thereon. To achieve complete sealing, both organic and inorganic particles of different sizes were mixed with obtained sol–gel hybrid systems. Coated surfaces were investigated by means of a scanning electron microscope. The stain resistance and the cleanability of the tile surface were tested according to ISO-10545-2014 standard. It has been shown that prepared sealing material permanently prevents formation of stains such as olive oil, green staining paste, iodine solution on the surface of polished porcelain tiles. The remains of stains on the surface can easily be removed from it with a cleaning agent.     

石蜡胶囊的制备及其对砂浆热导和力学性能的影响

为解决固-液相变材料封装问题,以石蜡为芯材,陶粒颗粒为载体,水泥为封装材料制备了石蜡胶囊.分析了石蜡胶囊的基本性质,测试了石蜡胶囊的DSC曲线;并将石蜡胶囊掺入砂浆中,研究了掺入石蜡胶囊对砂浆热导和力学性能的影响.研究表明:使用水泥封装后,石蜡胶囊的密封性好,高温下不会发生泄露;石蜡胶囊掺入砂浆中,对砂浆力学性能影响较小,且可降低砂浆的导热系数和水泥水化温度,并推迟水化温度峰值的出现.     

胶铆连接性能研究

胶铆连接集中了胶接的连续密封性能、耐疲劳性能和铆接的抗剥离性能。本文选取SY－H2糊状胶粘剂,综合对比了胶接试样、铆接试样和胶铆试样的力学性能和耐疲劳性能。胶接能够提供连续的面连接,有利于减轻结构重量。胶接和胶铆试样的疲劳性能优于铆接试样,在相同频率下的破坏应力或循环周期都高于铆接试样。     

Influence of Experimental Conditions on Reliability of Carbon Tolerance Studies on Ni/YSZ SOFC Anodes Operated with Methane

The effect of experimental parameters on carbon accumulation in the Ni/YSZ anode of SOFC operated at 1,073 K with CH₄, has been described in this paper. Experimental parameters including sealing of the cell to the cell holder, operating current, surface coverage by current collector paste on the surface of the anode, and the configuration of the current collector were evaluated in terms of carbon accumulation at the Ni/YSZ anode. The carbon accumulation was quantified using temperature‐programmed oxidation and cells were examined using scanning electron microscopy. The results suggested that variations in any of these experimental parameters could significantly increase or decrease the amount of carbon accumulation on Ni/YSZ anodes, and hence, the reliability of the carbon tolerance studies. In particular, the higher the air leakage rate, the less carbon that accumulated on equivalent anodes. The extent of surface coverage by current collector paste and the configuration of current collector also impacted the amount of carbon accumulation. Less carbon accumulated directly below and near the areas of current collector paste than on the anode areas directly exposed to CH₄ and far from the current collector paste. Additionally, variations in the fuel humidity and current levels also significantly influenced the carbon accumulation.