纳米蒙脱土填充紫外光固化涂层的介质传输行为

采用静态浸泡法绘制了漆膜增重-时间曲线,研究了纳米蒙脱土(nanoMMT)填充紫外光固化涂层的吸水性及纳米蒙脱土用量、环氧丙烯酸酯(EA)与合成活性稀释剂(RD)比例、光固化涂层的固化程度与介质传输行为的关系.结果表明,WEA∶WRD越大、涂层的固化程度越高,涂层的抗介质渗透性能越好.添加纳米蒙脱土能促进涂层中酯键的水解,对涂层的耐介质传输性能不利.     

磷氮阻燃剂 / 纯丙树脂光固化复合膨胀阻燃涂层制备及膨胀行为

目的制备一种新型磷氮类紫外光固化膨胀阻燃涂层,研究磷氮复合成分对阻燃性能及膨胀行为的影响。方法采用丙烯酸正丁酯、甲基丙烯酸甲酯、甲基丙烯酸缩水甘油酯为原料制备环氧侧基聚丙烯酸酯,进一步利用丙烯酸开环环氧制备光固化聚丙烯酸酯,并结合前期所合成的含磷单体磷杂环丙烯酸酯磷酸酯(PGMH)和含氮光固化单体三嗪基四丙烯酸酯(BDAETH)制备光固化膨胀阻燃涂层。通过热重法和红外光谱研究了PGMH对光固化聚丙烯酸酯固化膜热降解机理的影响。采用极限氧指数对涂层阻燃性能进行研究,设计并自制设备对涂层的膨胀行为进行监测。结果随着磷氮复合阻燃剂的添加,涂层在450~480℃之间快速膨胀,其最大单向膨胀度可达14。膨胀碳层隔绝氧气,从而提升阻燃性能,将光固化聚丙烯酸酯的氧指数从19提升到28.5。结论磷氮复合阻燃剂的添加可有效赋予涂层在升温或燃烧过程中的膨胀特性,生成隔绝氧气的膨胀碳层,提高涂层的阻燃性能。     

水和氯离子在纳米蒙脱土改性光固化涂层中的传输行为

采用静态浸泡法绘制了漆膜增重-时间曲线,考察了纳米蒙脱土(nano-MMT)改性紫外光固化涂层的吸水性,分析了纳米蒙脱土用量、环氧丙烯酸酯(EA)与合成活性稀释剂(AD)比例、光固化涂层的固化程度与介质传输行为的关系。结果表明:在浸泡初期,NaCl溶液在涂层中的传输行为符合Fick扩散定律,之后涂层吸水量达到饱和,由计算公式可求得渗透介质在涂层中的扩散系数。同时,涂层的固化程度越高、WEA:WAD越大,涂层的抗介质渗透性能越好。     

水性UV聚氨酯丙烯酸酯/二氧化硅复合材料的制备及涂膜性能

目的 制备光固化水性聚氨酯改性丙烯酸酯/二氧化硅（WPUA/SiO2）复合材料,提高水性光固化聚合物材料的涂膜性能。方法 制备含双键官能化的二氧化硅纳米粒子,将其引入到制备的可光固化聚氨酯改性丙烯酸酯乳液体系中,制备水性UV固化WPUA/SiO2复合乳液,研究复合材料制备方法,分析体系中官能化二氧化硅纳米粒子的分散稳定性及其对涂膜形貌、透光性、硬度等性能的影响。结果 由于WPUA和官能化二氧化硅纳米粒子均含有C==C,所制备的WPUA/SiO2复合材料可以用UV光进行固化,官能化二氧化硅纳米颗粒由于表面存在有机分子链,与水性聚氨酯改性丙烯酸酯相容性提高,使得二氧化硅纳米颗粒掺杂量达到10％（质量分数）时可存储稳定性达30天以上。固化后涂层的透光性和力学性能明显提升,涂层铅笔硬度达到3H,粘附性为1级,抗冲击强度大于50 kg?cm。结论 制备的WPUA/SiO2复合体系具有良好的稳定性,改性纳米粒子的掺杂对水性UV固化聚氨酯改性丙烯酸酯的力学性能有明显改善,且可提高复合涂层的透光性。     

低温固化AMT–GO/EP复合涂层的制备及防腐性能研究

目的 研究?10 ℃下固化的复合涂层在常温和低温环境下的防腐性能。方法 通过溶液共混法成功制备了2–氨基–5巯基–1,3,4噻二唑修饰的氧化石墨烯(AMT–GO),并将其作为填料添加到环氧树脂(EP)中,随后在?10 ℃环境下进行固化,形成AMT–GO/EP复合涂层。同时,制备纯环氧涂层(纯EP)和氧化石墨烯增强环氧涂层(GO/EP)作为对照。通过盐雾试验、低温–盐雾交替试验、附着力测试和吸水率测试等方法研究了低温固化涂层的防腐性能。结果 加入AMT–GO填料的环氧涂层在?10 ℃的环境下经过72 h后可良好固化,形成更致密的交联结构,在6 d的中性盐雾试验后仍具备良好的防腐性能。该涂层的吸水率(2.77%)约为纯环氧涂层(5%)的一半,其附着力(5.53 MPa)大于纯环氧涂层的附着力(4.01 MPa)。结论 AMT可以有效地改善氧化石墨烯在环氧涂层中的分散性,在环氧涂层中添加一定量的AMT–GO可以提高低温固化涂层的交联密度,有效阻碍了腐蚀介质的渗透过程,提高了涂层的防腐性能。另外,该涂层在低温–盐雾交替试验中仍保持十分优异的防腐性能。     

传能光纤表面低折射率光固化涂层的制备

目的 制备低折射率光固化涂层。 方法 以全氟十一烷基丙烯酸酯( FA) 、甲基丙烯酸三氟乙酯( TRIFEMA) 、四氢呋喃丙烯酸酯 GM61 P00 ( THFA) 和聚氨酯丙烯酸酯( PU) 为主要组分,考察各组分用量对涂层接触角、吸光度和折射率的影响。 结果 在一定的用量范围内,折射率随 FA 和 TRIFEMA 用量增加而降低,随 THFA 和 PU 用量增加而升高;接触角随 FA 和 TRIFEMA 用量增加,先增大,然后保持稳定,随 THFA 和 PU 用量增加而减小;吸光度随 FA 用量增加而增大,随 TRIFEMA,THFA 和 PU 用量增加而减小。 结论 低折射率光固化涂料的最佳配比为 m( FA) : m( TRIFEMA) : m( THFA) : m( PU) = 2 :5 : 1 . 25 : 1 ,其涂层折射率为 1 . 387 ,吸光度为 0 . 0091 。     

UV固化有机硅改性聚氨酯易清洁涂层的制备及性能研究

目的 研究聚二甲基硅氧烷(PDMS)相对分子质量、官能度及添加量对紫外光(UV)固化聚氨酯丙烯酸酯易清洁涂层防污性能的影响。方法 以聚乙二醇(PEG)、异佛尔酮二异氰酸酯(IPDI)、羟基封端的PDMS和季戊四醇三丙烯酸酯(PETA)为原料,采用一锅法制备了有机硅改性聚氨酯丙烯酸酯易清洁树脂,并UV固化得到易清洁涂层。结果 添加5 000相对分子质量PDMS(PDMS–5000)的涂层比添加1 000相对分子质量PDMS(PDMS–1000)的涂层具有更高的接触角、更低的滑动角、更好的油性记号笔笔迹收缩效果和耐磨性能,但涂层透过率明显降低;添加双羟基封端的PDMS(PDMS–B)的涂层比添加单羟基封端的PDMS(PDMS–A)的涂层具有更好的油性记号笔笔迹收缩效果和耐磨性能。随着涂层中PDMS的添加量从0.5%提高到2.0%,防污性能逐渐提高。同时根据XPS分析可知,当涂层中PDMS的添加量提高到2%时,涂层表面的Si含量接近饱和,防污性能达到最佳。易清洁涂层即使经过1 000次的磨损循环测试后,依然具有油性记号笔笔迹收缩效果。结论 PDMS–B改性的聚氨酯丙烯酸酯涂层比PDMS–A改性的聚氨酯丙烯酸酯涂层具有更优异的记号笔笔迹收缩性能和耐磨性能,而且PDMS–5000改性的聚氨酯丙烯酸酯涂层比PDMS–1000改性的聚氨酯丙烯酸酯涂层具有更好的易清洁性能。当PDMS的添加量从0.5%提高到2.0%时,涂层的疏水疏油性能逐渐提高。     

水性 UV 树脂的研究进展

详细介绍了各类水性UV树脂的优缺点和合成方法,包括水性聚丙烯酸酯、水性聚酯丙烯酸酯、水性环氧丙烯酸酯、水性聚氨酯丙烯酸酯等。综述了水性UV树脂在超支化技术、有机/无机杂化体系、双重固化体系、环氧丙烯酸酯/聚氨酯丙烯酸酯复合体系等方面的研究进展,简要介绍了水性UV树脂的应用,并展望了其未来的发展方向。     

静电喷涂高附着力疏水涂层及其性能

目的提高静电喷涂疏水涂层的附着力。方法采用硅烷偶联剂和聚二甲基硅氧烷制备了表面改性疏水二氧化硅粉末。将一定比例的聚偏氟乙烯粉末、超高分子量聚乙烯粉末与疏水二氧化硅粉末混合,制备了复合型疏水粉末。使用环氧树脂、固化剂、活性剂等配制了导电环氧树脂。通过静电喷涂工艺将复合疏水粉末喷涂到已用导电环氧树脂覆盖的铝基板表面,经过中温固化,制得了铝合金疏水复合涂层。采用扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FTIR)、接触角测量仪(CA)、百格刀附着力测试仪等,对疏水复合涂层进行测试表征。结果 SEM结果表明涂层表面构建了微米-纳米的阶层粗糙结构,经CA测试,该表面具有较好的疏水性。当混合粉末中聚二甲基硅氧烷改性二氧化硅的比例占到20%时,环氧基疏水涂层的接触角最高可达到140°,滚动角最低可达5°,附着力的等级为0级,同时疏水涂层的耐磨性和耐腐蚀性良好。结论采用简单、易于工业化的静电喷涂工艺制备了高附着力的疏水涂层,具有广泛的应用前景。     

基于光固化超支化聚氨酯的SiO2/TiO2有机无机杂化涂料的制备及表征

对自制的多羟基超支化聚氨酯进行改性,制备了超支化杂化聚氨酯和光固化超支化聚氨酯,采用傅立叶红外光谱和核磁共振氢谱对预期产物进行表征,然后与不同比例的正硅酸乙酯和钛酸正丁酯共混水解,得到一系列光固化超支化有机无机杂化溶胶。用原子力显微镜表征了杂化涂层的表面形貌,并测试了涂层的物理性能。结果表明:杂化涂层的表面质量随无机物含量的增加而变差,SiO2杂化涂层的表面质量优于TiO2杂化涂层,其混合杂化涂层的表面质量介于两者之间;杂化涂层的摆杆硬度随着无机物含量的增加而增大,超支化SiO2杂化涂层的性能较好。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

The Mirror with Patterns of Auspicious Animals and Grapes——Exquisite cast mirror and the technology of surface tin-enrichment by rubbing-in and infiltration of tin-rich powder

<正>Bronze mirrors were used by the Chinese people before the introduction of the glass mirror.Only after it was replaced by the glass mirror did the bronze mirror gradually retreat from people's lives.Different styles of bronze mirrors were made in different historical periods,particularly in the Warring States Period,the Han and Tang Dynasties,which were the three peaks of the development of bronze mirror arts in ancient China.The casting techniques were exquisite.The surface of the bronze mirror was smooth and bright enough to reflect one's image,and there were scarcely any casting defects on the mirror surface.On the back of the bronze mirror,there were rich depictions of Arts and Humanities,and the ornamentations were also     

The 9th China International Diecasting Congress & Exhibition

The 9th China International Diecasting Congress ＆ Exhibition was held on July 22-24, 2014 at Shanghai New International Expc Centre. This exhibition was the most successful over the years, with over 6890 visitors and 155 exhibitors, and the exhibition area increased by 30% from 9,500 square meters in 2012 to 12340 square meters. Die casting enterprises from a total of 24 countries and regions, including China mainland, Chinese Taiwan and Hong Kong, South Korea, Japan, Germany, India, Thailand, Malaysia, the United States, Russia, Australia, Iran, Ukraine, Brazil, Colombia, Singapore, Austria, Canada, Croatia, France, Turkey, United Kingdom, Vietnam, attended the congress and exhibition.     

Introduction of the Fluid Control Engineering Institute of Kunming University of Science and Technology

正The Fluid Control Engineering Institute of Kunming University of Science and Technology was set up in 1996.The researches of institute concentrate on electro-hydraulic(pneumatic)servo/proportional control and hydromechatronics.The Institute is committed to research and development of electro-hydraulic control of high-end technical equipment in ferrous metallurgy refining produc-     

RARE METALS Volume Contents

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Antimony Induced Crystallization of Amorphous Silicon

Antimony induced crystallization of PVD (physics vapor deposition) amorphous silicon can be observed on sapphire substrates. Very large crystalline regions up to several tens of micrometers can be formed. The Si diffraction patterns of the area of crystallization can be observed with TEM (transmission electron microscopy). Only a few and much smaller crystals of the order of 1μm were formed when the antimony layer was deposited by MBE (molecular beam epitaxy) compared with a layer formed by thermal evaporation. The use of high vacuum is essential in order to observe any Sb induced crystallization at all. In addition it is necessary to take measures to limit the evaporation of the antimony.     

A CUMULATIVE FATIGUE DAMAGE RULE UNDER THE ALTERNATIVE OF CORROSION OR CYCLIC LOADING

Fatigue damage increases with the applied loading cycles in a cumulative manner and the material deteriorates with the corrosion time. A cumulative fatigue damage rule under the alternative of corrosion or cyclic loading was proposed. The specimens of aluminum alloy LY12-CZ soaked in corrosive liquid for different times were tested under the constant amplitude cyclic loading to obtain S-N curves. The test was carried out to verify the proposed cumulative fatigue damage rule under the different combinations among corrosion time, loading level, and the cycle numbers. It was shown that the predicted residual fatigue lives showed a good agreement with the experimental results and the proposed rule was simple and can be easily adopted.