Advanced Materials Research Vol. 1021

Abstract: In order to solve the poor toughness, fatigue durability and shock resistance defects of the cured epoxy resin, in this paper, the epoxy resin was modified via dichlorodiphenyl silane as a modifier. Then the electronic packaging materials were prepared using the modified EP as matrix, a nitrile rubber (CTBN) as a toughening agent, methyl nadic anhydride (MNA) as a curing agent, and 2, 4, 6 - tris (dimethyl amino methyl) phenol as a curing accelerator. The effects of raw materials ratio on the cured products’ properties was investigated. FT-IR, TG-DTG and DMA were used to test and characterize the product. And we determined the best raw materials ratio and reaction conditions. Finally epoxy encapsulating materials which have excellent mechanical properties, electrical properties were prepared.

Abstract: The phase inversion process is a kind of efficient technology of emulsifying, it make its emulsifying ability to maximize by the means of control the factors of the HLB, the concentration of emulsifier, the ratio of emulsifier and oil and the temperature of emulsify. In this paper, the epoxy resin E-44 and polyethylene glycol used as materials, potassium persulfate as the catalytic agent, then we obtained the waterborne epoxy resin emulsion. The synthetic conditions of emulsifier, the mechanical stability and water-solubility of the emulsion were researched. Then the optimal amount of the emulsifier was determined and the modified emulsion was characterized, the particle size and viscosity were tested at the same time.

Abstract: Introduce the component of non-asbestos gasket material, and the raw materials which selected after a comparative study. Reasonable arrange the experiment through the design of orthogonal experiment method, reduce test times, shorten the cycle, avoid the blindness of when the experiment under the premise of the ideal results are obtained, and eventually won the basic formula composition of non-asbestos gasket materials.

Abstract: An advanced heat upsetting technology was studied according to the characteristics of the titanium alloy medical bone screws with spherical head. First, the reasons that punch demoulding is difficult during the upsetting forming have been discussed. Then the forming way with countersunk head in bottom and free forming on top was adopted, and the segmented upsetting die ranging in inner diameter was designed. Finally, the continuous heat upsetting process for medical bone screws was developed. The size, hardness and microstructure of the developed screws meet the standard requirements.

Abstract: In a previous work researchers found that fluorinated acrylate (PHFDA)/styrene (PSt)/ sulfonated styrene (S) copolymer can enhance the viscosity of carbon dioxide (CO₂) by factors greater than 100 at concentrations of 5 wt %. To further improve the efficiency of this copolymer, we apply the dissipative particle dynamics (DPD) method to investigate the link between copolymer molecular structure and the solution rheology. Results show that sulfonated copolymer molecules combine with each other and create self-assembly structures, which greatly thicken liquid CO₂. We conclude that we should increase the sulfonation degree on the premise of a reasonable solubility. Using a further dissolving experiment, we finally fix the mole fraction of PHFDA, PSt and S on 60%, 24% and 16%, respectively. We test the viscosity of the improved copolymer with rheometer, results show that it can increase the solution viscosity 180-fold relative to neat CO₂ at 334K and 28 MPa with a concentration of 2.5 wt %.

Abstract: Nowadays the traditional dyeing wastewater treatments based on flocculation-biochemical technology become more difficult than before. The study in this paper aim was it to probe how adding rare earths (REs) into iron-carbon micro-electrolysis process to advance dyeing wastewater degradation. Firstly, the principle was discussed. Then the experimental methods were stated and it followed by exploring effect of iron powder size on the dye decolorization rate. Next were design of the micro electrolysis orthogonal experiments and discussion of influences of related factors on waste water treatment. The experimental results show that besides common iron powder particle size and the processing time, the factors that have great influence on dyeing wastewater treatment are Ce⁴⁺, pH, La³⁺ and iron/carbon ratio. The sequence of factors influence on wastewater micro-electrolysis treatment is Ce⁴⁺ > pH > La³⁺ > iron/carbon ratio. When pH is 6, COD removal rate arrives at maximum 89%, however when the pH is in the case of too high or too low, the effect of sewage degradation is not good.

Abstract: Material selection is an important research aspect for manufacturing companies. To select a best material, many different tools are used to measure the candidate materials for many influence factors and in different situations, which will give a range of values. These measure values can be depicted with interval numbers. Then the material selection problem is actually a multi-attribute decision making (MADM) problem. Then this paper we will propose a MADM method based on the relative ratio method for the material selection problem. Coefficient of variation method will be used to determine the evaluation indexes’ weight. Finally, a practical example is presented to demonstrate the effectiveness and feasibility of the proposed method.

Abstract: With the wide application of thin film technology and optoelectronic devices, optical films have been widely used in the development and production of weapons and special devices for basic research. Faced with constantly updated status quo and development of optical thin film precision measurement of various parameters on a higher requirements, the film thickness is one of the key parameters in film design and manufacturing process. Particularly with the rapid development of nanoscale thin-film technology, the film thickness becomes a hot issue in the research field. For solid film thickness, the main measuring means are screw micrometer, microscopy, interferometry and polarization. Conventional Michelson interferometer can measure thin film thickness which is transparent and known, and the devices with sensors performance better.

Abstract: Corrosion experiments were done to test the corrosion behavior of 3Cr steel in different water cut content. The experimental result shown that with the increase of water cut, the corrosion rate was increase especially in the high water cut environment. From XRD and SEM analysis result, the corrosion composition was changed with the water cut content. The corrosion film became less protective with the increase of water cut.