换热器管板折流板加工工艺

管板和折流板是换热器中的主要部件,老式的机械加工方法效率低,误差大,即使采用数控钻床加工管板和折流板,也会出现许多问题,在生产的过程中,发现产生问题的原因,找出解决问题的方法,制定合理的加工工艺,才能不出或少出问题,在保证质量的前提下,提高工作效率。     

列管式换热器管板变形的原因及防止变形的工艺

详细分析了换热器中管板变形的原因,主要是管板的加工变形及加工时产生的变形,提出了防止管板变形的工艺对策。     

薄管板换热器的拉杆固定结构优化设计

薄管板换热器具有节省材料,加工方便的特点,可有效降低设备造价和缩短订货周期。由于管板自身特点,常规用于厚管板换热器上的拉杆结构已不适用于薄管板换热器。本文提出一种针对《热交换器》GB/T151-2014中拉杆与管板连接结构的优化结构,以适应薄管板换热器的设计要求。     

大直径薄管板热交换器制造过程中的管板变形控制

通过工程实践从管板堆焊、管孔加工、管板焊接等方面总结了大直径薄管板热交换器制作过程中的变形控制措施,细化了制作工艺,保证了该类热交换器换热器制作质量。     

大型管壳式换热器管-管板连接的可靠性措施

从材料性能、管孔的结构及加工要求、管与管板的连接形式等影响换热器管与管板连接接头强度的因素出发 ,结合乙烯大型换热器E EA12 3F的制造提出了管与管板连接接头的可靠性措施     

浮头式热器管板计算问题的讨论

随着工业的发展,换热器成为石油、化工、冶金、电力、轻工等业普遍应用的一种工艺设备.管壳式换热器在工业装置的换热设备中占有相当的比重.管板是管壳式换热器的主要部件,管板的设计是否合理对确保换热器的安全运行,节约材料,降低制造成本及减少加工制造困难是至关重要的.而管板的计算方法又有多种,情况也十分复杂.     

双管板换热器的结构设计

双管板换热器为管壳式换热器的一种特殊结构被广泛应用于换热器管程和壳程介质严禁混合的场合。双管板换热器的管板有普通型双管板和整块式双管板两种型式,由于整块管板加工难度大、成本高,而且在防止管壳程介质串流方面也不如普通型双管板,所以在实际设计制造中普通型双管板较为普遍。随着新型化工产品的研究开发,双管板换热器的用量逐年增加,而由于双管板换热器的特殊结构要求,在设计和制造过程中各细节必须充分考虑,产品质量才能保证。现以我公司在多晶硅项目上设计制造的一台固定双管板式换热器为例对双管板换热器的结构设计和强度计算进行阐述。     

固定管板换热器节能计算分析

结合在用固定管板换热器的运行参数，对相同构造的换热器在采用普通无缝钢管作换热管和采用螺旋槽管作换热管的情况下，分别计算换热器的传热系数，并对计算结果进行分析比较，表嚼采用螺旋槽管作换热管所起的强化传热作用对于固定管板换热器产生的节能效果明显，可以为企业带来较好的节能效益。     

废热锅炉换热器管板的试制

根据废热锅炉换热器管板的特点及现有加工能力 ,对其管板试制过程中加工变形、尺寸控制和制造工艺过程进行了综合分析与总结     

换热管与管板焊接结构的比较和选择

换热管与管板的连接焊缝是换热器中重要的焊接接头。对于不同的使用条件和介质腐蚀性,为了保证换热器在开、停车和异常工况或局部载荷条件下长期安全运行,必须合理选择换热管与管板的连接结构、焊缝形式和焊接工艺,以及焊后焊缝的检验方法。从确保连接可靠性、焊缝质量和加工的技术经济性角度出发,应选择最简单有效、加工方便的连接形式。     

Development of a thin film technique for an amorphous metallic ribbon/thermoplastic matrix composite system

A thin film method is developed for the fabrication of an amorphous metallic ribbon/PP (polypropylene) matrix composite system. The interfacial shear strength of composites fabricated with thin film is 0.52 ± 0.09 MPa (process B), which is comparable to that of the sandwich method of composite fabrication reported recently. The optical micrographs of the interfacial zone appear to be defect free and there are no visible voids, cracks, or air entrapment during fabrication. This qualitative analysis of the ribbon/matrix interface suggests that thin film can provide a better interfacial bond, a result which is supported by the results of pullouts tests. The composite fabrication time using the thin film method is short, and this method therefore has the potential to produce composites at a high volume fraction of ribbon reinforcements as compared to the sandwich method.     

钛复合板容器制造T字接头附近分层返修技术

钛复合板容器在制造过程中将会按制造工艺技术要求对钛复合层进行必要的超声波（UT）检测,以检查钛复合板容器在制造过程中是否存在复合板局部分层.主要介绍在对检测出的复合板分层区域进行返修后发现原来的分层区又延伸出新的分层原因和分层区域扩展延伸至T字接头附近（纵环缝交接处）的处理方法.     

高温合金精密铸造用陶瓷型芯成型技术研究进展

介绍了高温合金在航空发动机部件中的重要地位，以及高温合金熔模铸造用陶瓷型芯的应用背景，概述了陶瓷型芯成型技术的研究现状和重要意义。系统综述了先进陶瓷型芯成型技术的发展历史、特点及其最新研究进展，其中包括注射冷冻成型技术、无模成型技术、负复型技术以及充芯材料灌浆成型技术。重点介绍了立体光刻成型和三维打印成型等无模成型技术，并分析了目前无模成型技术所具有的独特优势和当前产业化所面临的问题与挑战。     

A novel fabrication method for glass foams with small pore size and controllable pore structure

In this paper, a novel fabrication method for glass foams has been introduced based on colloidal suspension foaming method using waste glass as starting materials. It is demonstrated for the first time that foam stabilization via in‐situ hydrophobization of waste glass particles is possible. The fabrication conditions for stable glass particle‐stabilized foams are optimized by investigating the influences of pH value, concentration of propyl gallate and ball milling time, respectively. It is demonstrated that this is a versatile method for fabrication of stable foamed glass suspension and final glass foams with small pore size of dozens of microns, which is much smaller than that of most glass foams in previous literatures. This novel method enables both closed pore structure and open pore structure simply by tailoring solid loading of glass suspension. A “sieve‐like” hierarchical pore structure can be achieved by adjusting sintering temperature. The glass foams with controllable structure could be applied in thermal insulation fields for closed pores, and in catalyst loading, filtration, and separation fields for open pores and hierarchical pore structure.     

Demulsification‐Induced Fast Solidification: A Novel Strategy for the Preparation of Polymer Films Based on Inorganic Salt Solutions and Organic Solvents

The development of a novel film fabrication strategy, named demulsification‐induced fast solidification (DIFS), for the rapid fabrication of large‐area polymer films is reported in this study. The polymer films are fabricated through dialysis and dipping processes using emulsions and a demulsifier based on the DIFS method. Furthermore, robust and flexible free‐standing films with controllable thicknesses and functionalities, such as tunable mechanical properties (elongation at break of 350–980% and ultimate tensile strength of 0.21–1.88 MPa); excellent optical properties (optical transmittance greater than 52.03% in the visible region, refractive index of 1.4888 ± 0.0001, and Abbe number of 52.1 ± 1.1); and luminescence properties, are rapidly and easily prepared by mechanical exfoliation based on the DIFS method. The results show that this academic concept and fabrication method will provide support for the design and preparation of functional polymer films that are highly desirable for optical, flexible device, and wearable material applications.     

Silicon-based photonic crystals fabricated using proton beam writing combined with electrochemical etching method

ABSTRACT: A method for fabrication of three-dimensional (3D) silicon nanostructures based on selective formation of porous silicon using ion beam irradiation of bulk p-type silicon followed by electrochemical etching is shown. It opens a route towards the fabrication of two-dimensional (2D) and 3D silicon-based photonic crystals with high flexibility and industrial compatibility. In this work, we present the fabrication of 2D photonic lattice and photonic slab structures and propose a process for the fabrication of 3D woodpile photonic crystals based on this approach. Simulated results of photonic band structures for the fabricated 2D photonic crystals show the presence of TE or TM gap in mid-infrared range.     

国内沉淀法制备氧化镁的研究现状

介绍了国内沉淀法制备氧化镁的工艺概况。     

Complex nanostructures synthesized from nanoparticle colloids under an external electric field

We present a novel method to synthesize complex nanostructured films through oriented connection of nanoparticles under an external electric field. Silver is taken as an example to validate the feasibility of this fabrication approach. The building blocks of the prepared silver films are able to be adjusted from nanoparticle to nanoflower, nanoplate, nanoslat, dendrite, and so forth, by either varying the deposition current density or changing the electrode. The obtained Ag complex structures show high SERS sensitivity. Importantly, this method can be extended to fabricate complex nanostructures of other materials, such as Cu(2)O. Further study of this new fabrication method may supply a simple and green method to realize various complicated nanostructures of different materials. The mechanism investigation is also important in understanding the assembly behavior of nanoparticles in the colloid under an external electric filed.     

合成陶瓷纤维材料的制备工艺及发展趋势

作为先进复合材料的增强剂，高性能陶瓷纤维日益引起材料研究人员的广泛关注，并导致了纤维制备方法的不断发展。与其他制备方法相比，先驱体转化法更适用于制备细径、组成结构可调的陶瓷纤维，其中溶胶-凝胶法在制备陶瓷纤维方面已经显示出其优越性，并取得了巨大进展。论述了中国合成陶瓷纤维的起源、种类、性能以及应用，着重介绍了陶瓷纤维的制备方法，并指出了陶瓷纤维的发展趋势。     

多孔碳酸钙的制备及应用研究进展

碳酸钙是一种稳定的无机化合物,在自然界中广泛存在。多孔碳酸钙作为无机材料,以其比表面积大、无毒、生物相容性好等优点而被广泛应用于化工、医药、冶金、食品等行业。但多孔碳酸钙的结构、性能与应用受其制备方法和工艺影响严重,不同方法制备得到的多孔碳酸钙呈现出千差万别的结构和晶型。本文主要介绍了多孔碳酸钙的常用制备方法,主要有模板法、乳状液膜法、共沉淀法、溶剂/水热法、凝胶结晶法、盐析法等,并简要阐述了各种方法的制备原理与优缺点,同时将一些较新领域应用所取得的成果进行了归纳。指出国内外研究多孔碳酸钙在制备方法和工艺方面存在产品结构与性能难精确控制、过程节能环保不到位、原料利用较局限等问题,建议开展多孔碳酸钙在废水废气方面的应用研究。