搭接焊铝塑管与对接焊铝塑管的长期静液压强度计算

将16-32规格的搭接焊铝塑管的长期静液压试验曲线外推至50年,通过考虑1个与对接焊铝塑管相同的总体设计系数（C=1.25）,证明在T0=95 ℃的长期工作温度下,16-32规格的搭接焊铝塑管与对接焊铝塑管的允许工作压力P0相当。搭接焊铝塑管也能满足95 ℃、1.25 MPa下使用寿命为50年的要求。根据国家标准对搭接焊铝塑管与对接焊铝塑管的铝管层最小壁厚和最小拉伸强度的要求,计算出16-50规格的搭接焊铝塑管与对接焊铝塑管的P0。结果表明,小规格二者的P0相当,大规格对接焊铝塑管的P0优势明显。     

共挤一步法对接焊铝塑复合管生产新工艺

阐述了共挤一步法对接焊铝塑复合管生产工艺过程，对其技术特点进行了重点介绍，为 提高铝塑管产品质量提供了宝贵经验。     

EP胶粘剂-不锈钢对接粘接结构的疲劳试验与理论研究

采用多功能拉伸试验机对EP(环氧树脂)胶粘剂-不锈钢对接粘接试件进行了疲劳试验[应力比(R)=0,疲劳应力幅值(Δσ)分别为10、12、14、15、16、18、20、22、25 MPa],并用Paris裂纹扩展疲劳寿命模型分析了该对接粘接结构的疲劳行为,同时还运用数值模拟法确定了初始裂纹和临界裂纹,进而根据试验结果确定了疲劳模型的特征参数。研究结果表明:对接粘接试件的疲劳寿命(N)随Δσ的增加而减小,并且疲劳过程中存在蠕变变形;当Δσ为16~25 MPa时,该模型能较好描述对接粘接结构的疲劳行为。     

解决预埋粘接件开裂的新方法

近年来，随着我国卫生陶瓷洁具的生产，出现了预埋粘接的新工艺。其工艺特点是将需要粘接的部件(附件)提前注浆制成预制件，在大胎注浆时，将预制件(附件)放置模型的适当位置，吃浆时部件(附件)和大胎会有机地连接为一体，达到粘接的目的。又无粘接痕迹。唐山陶瓷厂近来试制投产的坐27°便器就是采用了这种新工艺。     

运输带快速冷硫化粘接工艺

本文通过对运输带接头热硫化和冷硫化粘接工艺的实验对比，找出了适宜的胶粘剂和最佳冷硫化工艺条件。经生产现场运输带粘接试验的结果表明，采用冷硫化工艺粘接的综合效果优于热硫化工艺。     

用粘接技术代替焊接工艺的实例

１　概况我单位在加工图１所示的工件时，由于件１和件２的材料厚度仅有１ｍｍ，用点焊机对件１和件２进行焊接时，若电流和压力等工艺参数调整不当，很容易发生工件击穿现象；即使工艺参数调整合适，也会在工件的外表面留下电阻焊所特有的凹坑。由于件１所用材料为镜面不锈钢，焊后表面不再经抛光、喷漆或喷塑处理，因此工件表面的凹坑将严重影响到产品的外观质量，不利于产品的销售。图１　工件加工示意图２　粘接技术工艺为了解决上述问题，我们对工件的功能进行了分析。通过分析得知，件２的作用仅是将件１内表面所形成的空间分成相互隔…     

橡胶与金属粘接性能的影响因素

研究了用麦固姆(Megum)系列胶粘剂粘接金属和橡胶时各种因素对粘接性能的影响，包括钢试片处理工艺、胶粘剂的黏度、活化处理及硫化条件等。确定了最佳粘接工艺。     

电力用外绝缘硅橡胶界面粘接作用的影响因素

从底涂剂、电绝缘固体硅橡胶、被粘接基材的预处理和生产加工工艺4个方面介绍了其对电力用外绝缘硅橡胶界面粘接的影响,并对粘接性的改进提出了建议.     

粘接技术在机电设备维修中的应用实例

粘接技术作为一项新工艺广泛应用于机电设备的维修行业,解决了传统方法不能或难以解决的问题。我厂开始学习应用,经历了由起初的怀疑讥讽到相信、设计采用的过程。并逐步认识到,粘接技术能解决螺、铆、焊;过盈配合等常规工艺不易解决的难题,操简便易行,经济效益显著,能解燃眉之急。本文介绍部分实例,供参考。一、变压器不停电堵漏我厂635KVA变压器散热管片,因有焊接缺陷而漏油,几年来未解决,直接损失两千多元。我们采用组合胶粘剂堵漏处理,现     

塑料粘接磁体注射成型技术的研究

阐述了塑料粘接磁体注射成型工艺、特点,着重分析了粘接剂、磁粉含量、磁场注塑机、模具结构等关键技术对塑料粘接磁体生产与使用的影响.     

塑料管材的发展概况及市场调查

介绍了国内外塑料管材的发展概况,对比分析了PE X管、PP R管、铝塑复合管、PE管等几种塑料管的优缺点和市场竞争力,重点从技术和市场两方面讨论了国内塑料管材发展的状况和目前存在的问题。     

改性MDPE铝塑复合管的研制

探讨了在中密度聚乙烯（MDPE）中加入不同含量的纳米CaCO,和分散剂对材料性能的影响,制备了改性MDPE铝塑复合管,并对改性后的铝塑复合管的各项性能进行了测试。结果表明,加入适量的经分散剂处理的纳米CaCO3可使铝塑复合管的塑料层性能明显提高,管材的各项指标均满足标准要求。     

中国塑料管道新产品和新型塑料管道系统

综述了近年来中国塑料管道行业涌现的改性聚氯乙烯（PVC-M）管、双轴取向聚氯乙烯（PVC-O）管、耐热聚乙烯（PE-RT）管、β-PP-R管、超高相对分子质量聚乙烯（PE-UHMW）管等塑料管道新产品的研发和应用进展,介绍了塑料和金属复合管道及塑料和塑料复合管道的技术特点和应用领域。此外,对于一些新出现的塑料管道系统也做了详细的阐述,重点说明了它们和建筑应用技术结合的优势。最后,结合国家的产业政策,对中国塑料管道行业前景进行分析和展望。     

钢骨架塑料复合管的性能和应用

对钢骨架塑料复合管与其他管道的性能进行了比较,对比结果证明:钢骨架塑料复合管具有耐压、耐磨、耐腐蚀、抗蠕变、安装方便以及较高的性价比等特点。     

Synergistic enhancement in mechanical and ballistic properties of HTPB based energetic polymer composites

Abstract

Influence of chain extender (CE) and bonding agent (BA) on the mechanical, interfacial and ballistic properties of AP/Al/HTPB composite is determined and compared. Results indicate a relationship between the two properties. The composite without the additives exhibited extremely poor mechanical properties whereas maximum tensile strength and ultimate elongation is achieved by introducing CE in the conventional composite. Better mechanical properties in this modified composite also contributed in improving the ballistic behaviour. SEM analysis of the condensed combustion residues obtained from the propellant burnt in open atmosphere reveals a considerable decrease in the agglomerate size in the modified composite. This effect is reflected as higher specific impulse in this composite, determined from thrust time profile obtained in static bed test. Pressure time profile for the modified composite manifests a stable and consistent burning at the tail end in tubular geometry as opposed to the conventional system that exhibits a susceptible and unstable tail-off.     

Advanced high-temperature (RT-1100°C) resistant adhesion technique for joining dissimilar ZrO2 ceramic and TC4 superalloys based on an inorganic/organic hybrid adhesive

To meet the high demand for ceramic/superalloy composite structural components in various fields, an advanced high-temperature adhesion technique was firstly developed by preparing a novel inorganic/organic hybrid adhesive suitable for ZrO₂ and TC4. Chemical bonding started to work at ～600°C, and became the crucial bonding mechanism at elevated temperatures. The formation of ZrSiO₄ and Ti₅Si₃ at the interfaces of two substrates not only increased the interfacial connection strength, but also formed two gradient layers with a size of ～2 μm to effectively alleviate the difference of composition and performance between the adhesive and substrates. In the temperature range of 500–900°C, the matching degree of CTE among ZrO₂, adhesive and TC4 is higher, and the maximum difference does not exceed 3×10^-6 K^-1. Meanwhile, the formation of a composite structure containing various ceramics (ZrO₂, SiC and ZrB₂) and intermetallics (Ni–Si, Al–Ni), and the improvement of structural compactness of adhesive from 500 to 900°C greatly improved the bonding strength to the maximum value of 31.4 MPa at 900°C. Also, the adhesive pretreated at 900°C showed good thermal cycling resistance, and the strength was still higher than 15 MPa after 50 cycles. For cured adhesive, when used directly in an extreme environment, it can provide bonding strength not less than 5 MPa in the whole temperature range, indicating that the adhesive possessed potential emergency repair convenience. This work significantly broadened the application of high-temperature-resistant adhesion technology in the connection of dissimilar ceramics and alloys.     

Size Effect of the Adhesive Bonding Strengths of Metal/Polymer Similar and Dissimilar Material Joints

The relationship between the adhesive bonding strengths and the bonding areas (sizes) is important for material and structural designs, because adhesive bonding is widely used not only in small scale electronic devices, but also in large-scale composite–metal joints of modern aircraft/ship structures. Therefore, a systematic experimental investigation on adhesive bonding strengths of polymer/polymer, metal/metal, and polymer/metal joints was conducted. Results show that the size effect of the bonding strengths is small for the current bonding areas (from 30 to 300 mm²), which are widely employed in most of the test standards for engineering designs.     

复合管材的物理性能研究

通过对聚乙烯/铝/聚乙烯(PE Al PE)和交联聚乙烯/铝合金/交联高密度聚乙烯(PEX Al PEX)两种铝塑复合管,分别以不同的生产厂家和不同的型号初步研究,采用拉伸与夹锯实验,找出彼此之间的区别与共同点。     

谈居住建筑供水领域中复合管材及其性能特点

介绍了供水用的铝塑复合管材、孔网钢带聚乙烯复合管材和复合涂塑焊接钢管,以及不锈钢与碳钢（或塑料）复合管材的性能特点,并展望了建筑供水领域中复合管材的发展趋势。