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一九八四年十二月和一九八七年十二月我厂曾为锦西化工总厂制造了二十块水银电解槽底板。按要求电极是在板上堆焊金属铜然后经机加工而成的。加工后的电极表面粗糙度为(?)。其实,由于焊接热作用产生局部变形使整板不平度超过1‰。为了解决这个问题,我们采用龙门铯光加工板面,然后在电极位置上进行刷镀的制造工艺,结果各项指标均达到技术要求,且使用效果很好。一、刷镀设备和材料 相似文献
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介绍用传递模压工艺生产复合式医用硅橡胶电极板,可提高产品合格率,降低生产成本,达到了设计目的。医用电极板是医疗电子仪器的必备传感器 相似文献
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不锈钢一碳化硅pH电极作为一种新型电极已在太原化肥厂、兴安化学材料厂、井陉维尼纶厂、石家庄化肥厂等化工、军工、化纤生产中应用,并取得了满意的效果。笔者在制作、测试、使用、推广不锈钢—碳化硅电极实践中,反复考验了这种电极的性能,进一步证实了,这种电极所具有的常规pH电极无可比拟的优势。同时从出现的诸多电极质量问题中,确认了影响不锈钢—碳化硅pH电极质量的关键是其密封材料问题。 相似文献
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近年来,在电分析方面,修饰电极的研究领域十分活跃。为提高电极的灵敏度,各种修饰电极相继出现,如碳糊电极、涂层电极及共价键合型修饰电极等。这些修饰电极,大多是在原有电极如玻碳电极上进行物理涂敷或化学处 相似文献
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采用Ansys数值模拟方法,建立了电场分析的有限元模型,研究了电极结构不同时的电场分布及其对纤维直径的影响,以及电压大小对纤维直径的影响。并进行了实验对照分析,发现电极结构包括圆板电极和圆环电极影响熔体静电纺丝的电场分布,但场强最大都出现在喷嘴处,并随接收距离的增大成不同趋势减小,但中空电极能集聚电场,稳定场强,获得更细的纤维。 相似文献
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本文研究了在彩电消磁用PTCR热敏电阻分别烧渗Ag-Zn电极和AI电极,研究了两种电极对PTCR元件常温断续负荷的影响,分析了失效机理,根据结果我们选取合适的电极作为实际生产中的电极。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(5):529-559
In this study the effect of adhesive free-end geometry on the initiation and propagation of damaged zones in adhesively bonded single- and double-lap joints was investigated considering the material non-linear behaviour of both adhesive and adherends and the geometrical non-linearity. The damaged adhesive and adherend zones exceeding the specified ultimate strains were determined based on the modified von Mises criterion for adherends and the failure criterion, including the effects of the hydrostatic stress states for the epoxy adhesives proposed by Raghava and Cadell. The stiffness of each finite element in the damaged zones was reduced to a negligible value, thus not contributing to the overall stiffness of the adhesive joint. This simple method provides useful information on the initiation and propagation of damaged zones in both the adhesive layer and adherends. The damaged adhesive zones due to a tensile load were observed to initiate around the rounded adherend corners inside the adhesive fillets and to propagate first towards both the free surface of the adhesive fillet and across the adhesive layer, and later along the adherend–adhesive interface. The damaged adhesive zones initiate at the left free-end of the adhesive-upper adherend interface and at the right free-end of the adhesive-lower adherend interface and propagate along these interfaces in the large adhesive fillets. In the bending test, the damaged adhesive zones appeared only at the left free-end in tension of the adhesive-upper adherend interface for the large adhesive fillets, but around the lower adherend corner for the smaller adhesive fillets. Later, it propagated with a similar mechanism as in the tensile load. In a double-lap joint subjected to a tensile load, the damaged zone appeared around the upper adherend corner inside the right adhesive fillet in tension, and propagated first towards the free surface of the adhesive fillet and through the adhesive layer towards the adhesive-middle adherend interface, and later along this interface. For all loading conditions, increasing the adhesive fillet size caused the damaged zone initiation to occur at a larger load level. The SEM micrographs of fracture surfaces around the adhesive fillets showed that the damaged zones initiated around the adherend corner inside the adhesive fillet and propagated through the adhesive fillets. 相似文献
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考虑胶层在自由型垫高阻尼结构中传递应力、应变的作用,将胶层等效为各向同性材料,采用ANSYS和MATLAB的联合仿真方法,分析含胶层的自由型垫高阻尼结构振动特性随胶层参数的变化规律。利用模态应变能法和控制变量法得到的结果表明,胶层对结构振动特性起着关键性的作用,因此,选择胶粘剂敷设自由型垫高阻尼结构时,应在保证胶层力学环境良好的前提下,选择满足胶层最佳特性区间的胶粘剂产品。 相似文献
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新型镀铝复合薄膜专用胶粘剂的研究 总被引:2,自引:0,他引:2
分析了影响BOPP/VMCPP型镀铝复合薄膜剥离强度的主要因素,即:BOPP和胶粘剂的界面强度;胶粘剂和VM的界面强度;VM和CPP的界面强度,以及胶粘剂的组成、分子结构、相对分子质量分布、单体残存量等,并合成了一种新型的镀铝膜和塑料薄膜复合用聚氨酯胶粘剂;讨论了胶粘剂的相对分子质量、相对分子质量分布、固化温度和时间等因素对粘结性能的影响。试验结果表明:该胶粘剂初粘力强、剥离强度高、溶剂残留量低,适用于快速复合薄膜生产线。 相似文献
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木质素在胶粘剂中的应用研究进展 总被引:1,自引:0,他引:1
介绍了木质素的结构、分类与性能以及改性方法,综述了木质素在酚醛树脂胶粘剂、脲醛树脂胶粘剂、三聚氰胺甲醛树脂胶粘剂、环氧树脂胶粘剂以及聚氨酯胶粘剂中的应用研究进展,并对今后的研究方向作了展望。 相似文献