储热材料三水醋酸钠的添加剂评选与优化实验研究

为改善储热材料三水醋酸钠凝固过程中存在的过冷和相分层问题,必须添加合适的成核剂和增稠剂.经过研究比较,选用了5种常用的成核剂Na2HPO4·12H2O、Na3PO4·12H2O、NaCO3·10HzO、Na2SiO3·9H2O和Na284O7·10H2O,以及3种增稠剂羧甲基纤维素、明胶和聚丙烯酰胺作为添加剂来改善其相...     

相变储热材料CH3COONa·3H2O的研究及发展趋势

简单介绍了无机水合盐CH3COONa·3H2O用作相变储热材料时的优缺点,针对其存在过冷和相分层问题,目前研究所得的解决方法是添加增稠剂和成核剂.综述了分别添加增稠剂、成核剂及同时添加时对CH3COONa·3H2O相分层和过冷抑制的研究进展,分析了不同的添加剂和添加量对抑制作用的不同以及温度影响添加剂抑制作用的原因,最后指出了CH3COONa·3H2O今后主要的研究方向.     

三水醋酸钠固液相变性能优化实验研究

三水醋酸钠（SAT）在凝固过程中存在着严重的分层和过冷现象,可以利用羧甲基纤维素（CMC）作为增稠剂并添加成核剂来解决过冷问题。本文通过5种成核剂实验得到了效果最好的成核剂配方,其质量配比为SAT∶十二水磷酸氢二纳∶CMC=100∶8∶4。实验过程中还发现加热温度对药品的性质有较大影响,温度过高会导致过冷度变大甚至直接不相变,通过实验得到SAT作为相变材料时加热温度的上限为82℃。     

低共熔冰过冷问题的研究

本文通过分析低共熔冰过冷机理 ,得出结论 :过冷是为结晶过程提供推动力 ,在纯净、无杂质液态物质冻结所必须的 ;成核剂的存在 ,可以大大减小过冷度。经过过冷度测定实验和熔化潜热测定实验发现 :对于机械冷板冷藏车的冷冻板用共晶液 ( KCl溶液 ) ,Cu S是最合适的成核添加剂 ,在一般场合下也可以考虑使用 Si O2 作为成核剂     

相变恒温材料六水氯化钙的研究

有关相变恒温材料，目前应用较多的是固液相变材料，而固液相变温度是混合相变材料应用的基础。本文着重研究了以氢氧化钡为成核剂和不同用量的无机相变材料六水氯化钙。利用步冷曲线法测定了添加质量分数分别为1．0％、2．0％和3．O％的氢氧化钡时六水氯化钙的相变温度。测定结果表明3．0％氢氧化钡添加量时，相变效果较好，相变温度为28．10℃。     

相变温度可调的无机混盐体系相变储能材料

现阶段,利用无机水合盐制备相变储能材料已成为一大研究热点,但是单组份无机水合盐相变储能材料的相变温度高,较难适用于温室大棚、室内节能材料等低温应用领域。为了解决这一问题,将CaCl2·6H2O、MgCl2·6H2O以及H2O混合配制出了CaCl2-MgCl2-H2O混盐体系,并采用Thistory方法和差示扫描量热法研究了混盐的体系组成、成核剂添加量等因素对材料相变性能的影响。制备的CaCl2-MgCl2-H2O混盐相变材料可以在25℃以下完全熔解,并且通过改变混盐体系的组成可使材料凝固温度在10℃~20℃范围内可调。此外,本研究在一定程度上解决了无机水合盐相变储能材料在相变过程中的过冷和相分离现象。     

几种成核剂对硫酸钠溶液过冷度的影响

对共晶盐溶液过冷机理进行了理论分析.以硫化铜、四硼酸钠、尿素、丙三醇为成核剂,实验研究了成核剂对硫酸钠溶液过冷度的影响.结果表明四硼酸钠能较好的改善过冷现象,并且对硫酸钠溶液的潜热影响较小.     

成核剂对八水氢氧化钡相变材料过冷度的影响

八水氢氧化钡在相变过程中存在严重的相分离和过冷现象。采用步冷曲线法研究分析在冷水冷却封闭体系和室温冷却开放体系两种工况下石英、十二水磷酸氢二钠、硼砂和二水氯化钙4种成核剂对八水氢氧化钡相变材料的成核效果。实验表明:石英和十二水磷酸氢二钠随着添加量的增加,八水氢氧化钡的过冷度有增大的趋势。质量分数为3%或5%的硼砂和二水氯化钙在室温冷却开放体系工况下能够抑制八水氢氧化钡的过冷度,同时附加1%的明胶作为防相分层剂使用,八水氢氧化钡的过冷性能得到进一步改善,过冷度可降低至1℃以下,并且还可以有效地防止相分层。     

冰蓄冷空调过冷成核研究

本文对冰蓄冷空调中的水过冷成核机理进行了理论和实验研究,筛选出较好的成核剂,使得水的过冷度减小直至消除,这对提高冰蓄冷空调系统的效率极为有利。     

冰蓄冷空调过冷成核研究

对冰蓄冰空调中的水过冷成核机理进行了理论和实验研究，筛选出较好的成核剂，使得水的过冷度减小直至消除，这对提高冰蓄冷空调系统的效率极为有利。     

Effect of Permeable Crystalline Material on Steel Reinforcement Corrosion of Concrete

Permeable crystalline materialcan permeate into pores and cracks of concrete and catalyze the reaction between Ca(OH) 2and unhydrated cement to generate a great quantity needle non-soluble crystals, which can stop up the pores and cracks of concrete, and increase the impermeability of concrete. This paper reported the results of a study conducted to evaluate steel reinforcement corrosion of concrete specimens uncoated and coated with permeable crystalline material as well as mixed with the permeable crystalline material. The properties evaluated for corrosion test were water impermeability, water absorption, compressive strength and potential. The results of water impermeability, water absorption, compressive strength clearly showed that the permeable crystalline material could prohibit water, any soluble salts and moisture from penetrating the concrete to cause corrosion, leaking, and other problems, and it did increase the compressive strength, which was favorable for protection of corrosion of reinforcing steel. Moreover, it was concluded from the potential-time curve that the steel reinforcement of uncoated specimen was in the state of activation whereas that of other specimens coated and mixed with the permeable crystalline material was in the state of inactivation. Above all, it was indicated that the permeable crystalline materialis very effective to protect the steel reinforcement of concrete from corrosion.     

The Research and Application About "Dry Peeling Off" Technology for Airplane Surface Paint Layer

In this paper, the principle of spurting take off lacquer were introduced; and with orthogonal method the unsaturate polyester was prepared ;it was easy to peel airplane paint layer off with this material and equipment.     

Quality Study of Honeycomb Core Shaping Without Wax Stabilization

Sandwich panels utilizing honeycomb cores result in lightweight, high-strength units that are very rigid. Indeed, they give honeycomb panels the best strength-to-weight ratio of any construction type available. Conventionally, the wax is poured into the cell of the core to strengthen the structure and prevent the core from being crushed during milling. Much time and labor is required to wax, mill, and clean the cores. In this study, the process of pouring wax into the core was skipped. In other words, the cutter directly milled the core. Experiments showed that the compressive strength of the core produced without wax stabilization was only 3% lower than that of cores produced using the traditional method. In addition, the drum peel strengths of cores produced without wax stabilization were 38.4% higher than cores produced using the traditional method, in which residual wax seriously polluted the adhesive. It was also found that eliminating the wax process can reduce costs.     

In-process thermal treatment of polylactic acid in fused deposition modelling

Polylactic acid (PLA) is one of the most widely used open source fused filament fabrication materials due to its ease of extrusion, biodegradability, and mechanical strength. The mechanical strength of PLA largely depends on the proper growth of its semi-crystalline structure, which can be severely impaired by a low rate of crystallization, particularly in open source printers. This can be further aggravated by the non-uniform thermal distribution of heat that causes improper curing among the extruded beads of the printing material. As a result, PLA printed on open source printers does not achieve the best mechanical properties. This research, for the first time, proposes an additive-free solution implemented through a detailed set of experimentation to improve the curing rate through in-process temperature variations to cure the joints among the beads. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy is used to confirm the improvements in the bead joints. This work is conducted in two phases of experiments. In the first phase, a full factorial ANOVA is used to investigate various process parameters and the important variables are used in the second phase to print test specimens in four different sets.     

Investigation of the Corrosion Behaviors of HVOF-Sprayed Carbide Cernet Coatings in Molten Al-Zn-Si Alloy Bath

In continuous hot-dip galvanization process the corrosion and chemical stability of the sink roll in the galvanizing bath are important problem which effects on the quality and productivity. In order to protect the sink roll the carbide cermet and/or ceramic coatings were deposited on the surface of the sink roll. The WC-, Cr3 C2-cermet coatings were deposited by high velocity oxygen fuel (HVOF) spray, respectively. The coating samples were immersed in molten Zn-alloy containing 50 wt % aluminum at 833 K for 24 hr and 144 hr, respectively. The inter-diffusion and inter-reaction of Zn, Al and elements in coating and corrosion behaviors of these coatings were investigated by XRD, SEM and EPMA etc. The corrosion mechanisms of the carbide cermet coatings and ceramic coatings in molten High Al-Zn-alloy were approached.     

Fundamental study of adhesion of ice to cooling solid surface (Discussion on influence of copper oxide layer on ice adhesion force)

In many situations, ice often adheres to a cooling solid surface, frequently causing serious accidents. It is critical to clarify the mechanism of ice adhesion to the cooling surface in order to prevent ice adhesion. In a past study, the shearing stresses of two kinds of test plates with a copper surface having the higher thermal conductivity were measured. The shearing stress corresponds to ice adhesion force. Both shearing stresses were significantly different; however, the cause remains unclear.Therefore, the present study focuses on an oxide layer as the main factor causing the difference of both shearing stresses; the influence of the oxide layer formed on shearing stress was discussed. And in the removal and reformation processes of the oxide layer, the time variation of the shearing stress was clarified. Moreover, the relationship between the state of the copper surface and the shearing stress was also clarified by surface analysis.     

＂Three Transformations＂ and Standardization

During his inspection in Henan Province in May, Chinese President Xi Jinping stressed to ＂push forward the transformation from China Speed to China Quality, from Made in China to Created in China, and from Chinese Products to Chinese Brand＂. The ＂Three Transformations＂ are the specific requirements and goal of China＇s national development in the context that market should play a decisive role in the allocation of resources.     

重塑标准推行格局 推动LED照明的普及（英文）

正When you are enjoying the green,energy-saving and healthy lighting of IKEA LED luminaire,you may not realize that most of IKEA’s LED bulbs are produced by the LED luminaire smart manufacturing system of Hangzhou Zhongwei Photoelectricity CO.,LTD(ZVISION).No longer enclosed in the laboratory,the product standards are brought into the factory workshop and even to the entire production process.Thus,the standards are promoted and applied in a favorable way by enterprises,benefitting consumers with high quality products.     

Chinese Experts Contribute to ISO＇s New Toy Standards

正The international standard,ISO 8124-6,Safety of toys–Part 6:Certain phthalate esters in toys and children’s products,was officially issued by ISO worldwide on August 15.It was the first time for Chinese experts to lead the ISO standard development in toys industry.The standard was drafted by a group of Chinese experts from SAC/TC for toys and relevant Chinese departments and finally completed by a dedicated international group of experts.ISO 8124-6 makes a substantive breakthrough in the aspects of the scope of toys,limitation of plasticizer types,control of test cost,accuracy of test,operation convenience,etc.,offering the operational guidance for toy manufactures and testing laboratories.     

SAC Delegation Visits AENOR and Signs Cooperation Agreements

正SAC Administrator Tian Shihong led the Chinese delegation to visit the Spanish Association for Standardization and Certification(AENOR)on September 15,2014.Mrs.Begona Cristeto,the Vice-Minister of Industry,Energy and Tourism of Spain,and Mr.Avelino Brito,the President and CEO of AENOR greeted the delegation.The two sides had a deep and friendly discussion on strengthening the cooperation between China and Spain in the standardization field and promoting the standardization work to support the development of economy and trade in the two countries.