2021 Vol. 36, No. 1

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Materials Research
Research on the Effect of Seawater on the Properties of Ship Polymer Damping Materials under Marine Environment Conditions
WANG Wenfei
2021, 36(1): 1-6.
[Abstract](330) [PDF 6666KB](22)
Abstract:
The long term marine environment outdoor exposure experiment on the typical ship polymer damping materials under storage and seawater immersing test conditions was carried out in the South China Sea. The SEM characterization of the microstructures, mechanical properties, dynamic mechanical properties, glass transition temperatures, cross-link density, and the anti-vibration effect of the samples aged for 5 years were researched. The test results were analyzed to research the effects of the seawater on ageing process and properties of the ship viscoelastic polymer damping materials. It could be seen that the effect of pervasion and swelling of seawater on the properties of the ship polymer damping materials was notable and non-ignorable.
Study on Preparation and Kinetics of Silicon-containing Polyurethane
LIU Mingguang, LI Liang, WANG Wei
2021, 36(1): 7-12.
[Abstract](80) [PDF 4811KB](8)
Abstract:
Silicon-containing polyurethane was prepared by using 3-aminopropyltriethoxysilane(KH550), hydroxyethyl acrylate(HEA), 2,4-toluene diisocyanate, and p-cresol as raw materials. The reaction synthesis process was tracked by infrared spectroscopy. It was found that the end-reaction of NCO-terminated polyurethane prepolymer and p-methylphenol reacted as a secondary reaction without catalyst. When the catalyst triethylamine was added, the reaction was first-order reaction at the initial stage of the reaction. In the absence of a catalyst, the activation energy of the reaction was 46.96 kJ/mol, the activation energy of the reaction was 30.28 kJ/mol when the catalyst addition was 0.1%, and the activation energy of the reaction was 18.16 kJ/mol when the catalyst addition was 0.3%. The reaction activation energy decreased with the increasing of the amount of catalyst.
Study on Electrical Properties of Graphene-reinforced Al Matrix Composites
HAN Qian, HU Juntao, LIU Yanfeng, LI Chun, ZHENG Meng, HE Jia, HAO Shutong, LI Maoyang
2021, 36(1): 13-16,23.
[Abstract](210) [PDF 3031KB](14)
Abstract:
The graphene-enhanced Al-based composites were prepared by powder metallurgy, and the effects of graphene content and sintering temperature on the micro-structure, mechanical and electrical properties were studied. The results showed that when the addition amount of graphene was 0.3% and the sintering parameter was 580℃ and 1 h, the obtained composite grains were fine and uniform, the maximum density was 90.14%, the conductivity was up to 25.54 MS/m, and the hardness was HB23.35.
Study on Compressive Creep Behavior at Room Temperature and Dislocation Type of Ti-6Al-3Nb-2Zr-1Mo Alloy
XU Lingyu, WANG Yang, WANG Qi, JIANG Peng, LIAO Zhiqian
2021, 36(1): 17-23.
[Abstract](297) [PDF 7846KB](73)
Abstract:
Compressive creep behavior and mechanism at room temperature of Ti-6 Al-3 Nb-2 Zr-1 Mo alloy under different applied stresses were investigated, the creep curves were fitted, the critical value of the second stage of creep calculated, the microstructures of the alloy after compression at different stress levels observed by TEM, and the dislocation slip types studied. The results showed that the compressive creep curve of Ti-6 Al-3 Nb-2 Zr-1 Mo titanium alloy conformed to the time-strengthening model at room temperature, and the critical value of the second stage of creep was 518 MPa, which laid a foundation for the safety design of deep-sea equipment. The creep mechanism of Ti-6 Al-3 Nb-2 Zr-1 Mo titanium alloy at room temperature was mainly dislocation slip, and the slip system with the most easy starting was basal slip, followed by prismatic slip and pyramidal slip. By microstructure and creep curve analysis, it was concluded that pyramidal slip had a great contribution to creep deformation.
Analysis on Failure of Polyurethane Foam
XIAO Shuhua, FAN Jinjuan
2021, 36(1): 24-28.
[Abstract](163) [PDF 8080KB](11)
Abstract:
To find out the reason of the discoloration and scaling-off of the polyurethane foam in aircraft fuel tank, detection of fuel oil microorganism was conducted, the discoloration area of the foam slag observed, thermal weight loss and FTIR tested.Resultsshowed that the number of microorganism in the oil tank was high above the standard. A large number of coccus, fungus and mildew were found attached to the surface of the foam, and many gnawed holes appeared at the attached positions under the action of microbial degradation. Thermo gravimetric results showed that foam degradation occurred. The failure of foam in the fuel tank was mainly caused by excessive microorganisms.
Synthesis and Electrochemical Luminescence Characterization of CdSe/ZnSe Quantum Dots
FAN Xuemei, WANG Shumin, LI Zhejian, WANG Yimeng, LIU Ping, FAN Xinhui
2021, 36(1): 29-33.
[Abstract](138) [PDF 4410KB](11)
Abstract:
The core-shell CdSe/ZnSe quantum dots were synthesized by hydrothermal method based on the similar crystal structure and wider band gap of ZnSe semiconductor nanomaterial. The effect of reaction temperature, reaction time and molar ratio of Cd:Zn on the synthesis of quantum dots were investigated.Resultsshowed that when the temperature was between 70~160℃, the ZnSe shell was being coated on the CdSe core. When the reaction time was between 0~4 hours, the shell could be uniformly coated on the core. When the molar ratio of core to shell was 1:3, the electrochemical luminescence performance was the best, and its electrochemical luminescence intensity was 6 times higher than that of CdSe quantum dots.
Material Application
Study on Electrochemical Properties of Aluminum Alloy Anode under Low Temperature Condition
HOU Jing, WU Yaozeng, ZHOU Juan, ZHOU Peiyu
2021, 36(1): 34-38.
[Abstract](171) [PDF 1858KB](10)
Abstract:
The electrochemical properties of aluminum alloy sacrificial anode were detected by DNV-RP-B401-2011 method and NACE-TM0190-2006 method, and the electrochemical properties and the morphologies of anode dissolution of different aluminum anode components were analyzed under these conditions. The results showed that under the condition of the same chemical composition, the dissolution morphology and electrochemical data of sample 1 were better than those of sample 2, and the electrochemical performance of sample 4 was the best among the three different components of aluminum anode. In the low temperature environment of 2~3℃, due to the weaker reactivity of active elements, the electrochemical properties of aluminum alloy sacrificial anode were more poorly by DNV-RP-B401-2011 accelerated method than those by NACE-TM0190-2006 method. The precise control and uniform distribution of trace elements in the anode had great influence on the electrochemical performance and solubility of the sacrificial anode of aluminum alloy.
Study on Adhesion of Brass Layer by Physical Vapor Deposition to Titanium Rope and Rubber
LI Longteng, WU Yukun, XI Yulin, YANG Xuedong
2021, 36(1): 39-44.
[Abstract](99) [PDF 5451KB](10)
Abstract:
The brass was coated on the surface of titanium ropes by physical vapor deposition(PVD), the effects of titanium substrate surface treatment, brass coating composition, coating thickness and coating profile on adhesion of titanium rope and rubber were studied. The results showed that the effective removal of the surface passivation layer of the titanium substrate and the use of the bottoming transition layer could improve the binding force of the brass coating and the titanium. The binding force between the titanium rope and the rubber increased with the growth of Zn content in the brass coating, and went to growth platform area when the Zn content ≥ 30%. The increase of thickness would reduce the adhesion, while the increase of surface roughness of the rope was conductive to the adhesion.
Research on Preparation and Properties of Glass Pultrusion Profile of Fiber/Polypropylene Composite Yarn
ZHANG Ruitao, JING Rong, WANG Yanhui, MENG Yuchen, ZHANG Xinggang, ZHAO Yu
2021, 36(1): 45-50.
[Abstract](129) [PDF 5510KB](15)
Abstract:
The continuous fiber reinforced thermoplastic resin samples were prepared by pultrusion with glass fiber/polypropylene composite yarn as raw material. The pultruded samples were obtained on the lab-designed thermoplastic pultrusion line. The influences of the threading way of composite yarn, die structure, die temperature and pultrusion rate on the properties of the samples were investigated, so was the morphology of the cross section. The results showed that by adopting convergent cavity structure, increasing mold temperature and reducing pultrusion rate, the combination between glass fiber and resin was improved, the uniform distribution of fiber in the product was promoted, the porosity decreased and the mechanical properties were improved.
Structure Design and Vibration Characteristic of Constrained Damping Plate
ZHANG Dongyang, WANG Zhipeng, LI Yu, LIN Xinzhi, ZHANG Ling
2021, 36(1): 51-57.
[Abstract](95) [PDF 8624KB](9)
Abstract:
With the weight and thickness limits in practical application as constraint conditions, the damping structure was designed and the specimen prepared according to the constrained damping structure design theory. The first five natural frequencies and modal damping rations of the specimens were identified after the vibration test, and the influences of material parameters of damping layer, material parameters of constraint layer and damping structure form on damping performances of constrained damping structure were analyzed.
Study on the Influence Factors of Leakage Current of Tantalum Wires for Capacitors
XU Ninghui, WANG Zheng
2021, 36(1): 58-61.
[Abstract](50) [PDF 1567KB](8)
Abstract:
The effects of the tantalum wire purity and leakage current test conditions analysis on the tantalum wire leakage current were studied.Resultsshowed that the appropriate content of doping agent and the suitable ratio could significantly reduce the leakage current of tantalum wire. The anodic oxidation condition of tantalum wire was also an important factor affecting the leakage current. By controlling the purity of tantalum wire and optimizing anodizing conditions, the stable and reliable tantalum wire leakage current could be obtained.
Experimental Study on Compressive Properties of Closed-cell Aluminum Foam
CUI Yu, CONG Wei, CHANG Yiming
2021, 36(1): 62-64.
[Abstract](88) [PDF 2996KB](12)
Abstract:
As a new type of porous metal material, closed-cell aluminum foam has been used in many fields, but its compressive mechanical properties are affected by porosity, pore structure parameters, relative density and basic mechanical properties of the material. Therefore, for a new type of product developed by a closed-cell aluminum foam enterprise, after determining its relevant parameters, ten groups of samples were subjected to compression mechanics experiments to determine its stress-strain curve, and the significance of each section curve and its generation mechanism were analyzed. According to its special compressive mechanical properties, the energy absorption performance under external force was studied, which provided technical support and reference for the application of modified closed-cell aluminum foams in various industries.
Welding Technology
Research on Vacuum Diffusion Bonding of Multi-layer 316L Stainless Steel Plates
LIU Xiangqian, GUO Xiaohui, ZHAO Yanying, LI Qiulong, ZHANG Minghui, XU Zhe, LI Peiyue, LI Yanmo
2021, 36(1): 65-70.
[Abstract](125) [PDF 7379KB](12)
Abstract:
One hundred and fifty layers of 316 L stainless steel plates were successfully joined via the vacuum diffusion bonding. The mechanical properties and interfacial microstructure of joints were studied by tensile tests and metallographic observation. The results indicated that the yield strength and tensile strength of the base material(BM) processed by the same diffusion bonding parameters decreased significantly and the elongation increased obviously. Compared with those of the processed BM, the yield strength of the joint perpendicular to the boding interface increased, and the tensile strength and elongation decreased. The yield strength of the joint parallel to the boding interface was higher than that of the BM, the tensile strength equivalent to that of the BM, and the elongation lower than that of the BM. All the tensile samples including room-temperature and elevated samples exhibited typical ductile fracture. Each zone including the top, middle and bottom of the joint showed good bonding appearance, and the interfacial microstructures at different zones were similar.
Simulation Analysis and Control of Welding Deformation of Large Steel Foundation
ZHONG Hua, TONG Xinwei, CHENG Wentao, DING Penglong, HE Liang
2021, 36(1): 71-76.
[Abstract](111) [PDF 16961KB](13)
Abstract:
The simulation of welding process of the large stringer steel foundation was established by thermal elastic plastic FEM. By adopting double ellipsoid heat source method, the temperature field and stress field were calculated, therefore the residual stress and the deformation of the foundation structure were acquired. Bedsides, the influences of sequence of four weldings and the three foundation constraint ways on the welding deformation were analyzed.Resultsshowed that under the double restraints of mound layer and tack welding, the deformation was the slightest, and that by optimizing the welding sequence and fixture arrangement, the welding deformation could be reduced effectively.
Study on Experiment of D-N Fatigue Curve of Fillet Weld Joint of Pipe Seat
YANG Chao, ZHANG Yajun
2021, 36(1): 77-82.
[Abstract](139) [PDF 4195KB](11)
Abstract:
The weld joint of large diameter thick wall tube and small diameter tube of boiler always fails in view of fatigue action, and this failure mostly hails from periodic bending stress by small load and long lever arm. In this paper, based on characteristics and service condition of the pipe joint of pressure parts of the boiler, the specimen was designed. By cantilever bend loading mode, displacement-life curve of the fillet weld joint of pipe seat for the boiler, namely D-N curve, were studied by group-method. The results manifested that D-N curve could be used for finite life design of the fillet weld joint of pipe seat for the boiler and D-N data distribution could be expressed by power function rule, which would provide reference for assessment of fatigue life of the fillet weld joint of pipe seat for the boiler.
Review
Application of Electron Beam Surfi-sculpt and its Current Progress in Domestic Ship
YU Yan, GENG Yongliang, HAN Linju, DUAN Tianying, LI Sheng, LIU Xiangqian, GAO Qi, GAO Fuyang
2021, 36(1): 83-86.
[Abstract](100) [PDF 6087KB](11)
Abstract:
Here was summarized the application of electron beam surfi-sculpt(EBSS) technology in metal-composite materials, strengthening heat transfer components and coating surface pretreatment. Meanwhile, the present development of EBSS technology in domestic shipping was introduced, mainly including the fast EBSS technique based on vector control method, EBSS process of marine materials, and the performance of the EBSS sample.
Research Progress of Electrode Materials for Flexible Supercapacitors Based on Carbon Cloth
XIAO Yuyang, FENG Xuansheng, HUANG Ying
2021, 36(1): 87-95.
[Abstract](252) [PDF 3463KB](19)
Abstract:
Here were reviewed the classification of electrode materials for carbon capacitor-based supercapacitors, the preparation methods and modification of electrode materials, and the research progress in this field at home and abroad.
Experience Exchange
Standard Status and Proposal of B30 Copper Alloy Heat Transfer Tube for Condensers of Naval Ships
TAO Huan, YU Yan, ZHAO Guochao, ZHOU Tiezhu, LIU Xiaoyong, CHA Xiaoqin, LIU Feng, YU Wei, GAO Lingqing
2021, 36(1): 96-100.
[Abstract](189) [PDF 737KB](21)
Abstract:
The standard status of B30 copper alloy heat transfer tube for condensers of naval ships application was summarized. Proposal for standardization work of B30 copper alloy heat transfer tube was pinpointed on the basis of the analysis of chemical composition, mechanical properties at room temperature, process properties and nondestructive testing of B30 copper alloy heat transfer tube and the existing corrosion problems of B30 copper alloy heat transfer tube used for condensers of naval ships.

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