Xu Cailu, H. M. Tensi R. Roesch. Effect of the Cooling Conditions and Mg Content on the Microstructures of Al-Si11.0 Alloy[J]. Journal of Materials Engineering, 1999, 0(1): 3-6.
Effect of cooling conditions and Mg on the dendritic,eutectic structures of Al-Si11.0 alloy by unidirectional solidification was investigated.The results show that with increase of the cooling rate the first dendritic spacings and second dendritic arm spacings are evidently decreased;Mg addition raises the dendritic arm spacing considerably at the low cooling rate (<160K/min),while it has no significant influence on dendritic arm spacings at high cooling rate.Enhancement of the cooling rate fines the eutectic structure of Al-Si11.0 alloy.In all experimented cooling conditions the alloy with the addition of 0.15% Mg possesses the coarsest eutectic structure,while the alloy with the 0.3% Mg addition the finest structure in eutectics.
Wan Yizao, Wang Yulin, Dong Xianghong, Cheng Guoxiang, Tao Haiming. New Conductive Substrate Material of MH/Ni Cell Made from Nickel-coated VACF[J]. Journal of Materials Engineering, 1999, 0(1): 7-9,13.
A new type of substrate material of MH/Ni cell was prepared by plating viscose-based activated carbon fiber(VACF) with nickel (VACF(Ni)) Key parameters,such as electrical resistance,porosity,pore size and distribution,areal density and flexibility were determined in our study Results show that the properties of the VACF(Ni) substrate could be controlled by adjusting the plating processing parameters The VACF(Ni) can be a promising electrode substrate to replace the foamed nickel substrate.
MAH was grafted on PP powder surface by solid phase graft copolymerization with BPO and DCP as initiators.The grafting degree influenced by factors of the concentration of initiator and monomer,reaction temperature and time was studied.And graft extent and crystal structure of MAH-g-PP were characterized by XPS and WAXD.
Zhang Wenfeng, Pan Xiaonan. The Optimum Velocity of Cutting SiC p Reinforced Aluminium Matrix Composite with PCD Tool[J]. Journal of Materials Engineering, 1999, 0(1): 14-16,19.
The high performance of PCD tool were expounded by testing the property of PCD tool with SEM and comparison with natural diamond Base on the test of PCD tool cutting high strength SiC p reinforced aluminum matrix composite,the influence of cutting speed on cutting force,surface roughness, tool life and the cutting length were discussed, and the optimum cutting speed in this course was summarized.It is shown that the best total efficiency can be obtained when the optimum velocity is from 30 to 40 meters per minute.
Wang Yong, Wang Weidong, Han Tao. Study of the Welding Hot sensitivity of Sprayed Porcelain Pipe[J]. Journal of Materials Engineering, 1999, 0(1): 17-19.
A combination of HST,SEM and XRD was used for investigating the welding hot-sensitivity of sprayed porcelain pipe The experimental results show that the hardness of the base metal increases and the microstructure transfers from F+P to B+P+F with the peak temperature going up;after cyclic heating to 1350℃ and 1200℃, many intergranular cracks occur in base metal In the interface of the metal enamel,bubbles occur,but no cracks;while at peak temperature 950℃ and 700℃,there are cracks but no bubbles; the structure of enamel coating at peak temperature 1350℃ is examined as full vitresence , while the structure after cyclic heating at low peak temperature is mainly vitresence together with Na2MoO4(MoO3)y crystalline phase.
Zhang Maicang, Luo Zijian, Zeng Fanchang. Establishment of Constitutive Relationship for FGH95 Alloy Using Multiple Nonlinear Regression Method[J]. Journal of Materials Engineering, 1999, 0(1): 20-22.
Based on the isothermal constant strain-rate compression tests,the constitutive relationship for FGH95 alloy was established by using multiple nonlinear regression method Compared with that by using multiple linear regression method,it is found that the constitutive relationship proposed in the paper has clear physical background and high regression precision The method presented in this paper for establishment of constitutive relationship is universally applicable to engineering materials.
Dong Tianxiang, Pan Tang. The Design and Application of System Software for Reference Material Data Processing[J]. Journal of Materials Engineering, 1999, 0(1): 23-25,28.
A system software of reference material data processing,written by QB, is described The program is simple, prone to operation,and has comprehensive applicability.
Xiong Yancai, Hong Runzhou, Wang Yingjie, Lu Zheng, Qiang Jun. Influence of Vacuum Refining on Hydrogen Content and Chemical Composition of Al-Li Alloys[J]. Journal of Materials Engineering, 1999, 0(1): 26-28.
To resolve the difficult problem of high hydrogen content and hydrogen embrittlement in Al-Li alloys,the influence of vacuum refining on hydrogen content and chemical composition of 1420 alloy has been studied The result provides important parameters for production of Al-Li alloys and lays a foundation of improving strengh and toughness on Al-Li alloys.
Zhang Li, Yang Yong, Zhang Heng. Test Research on the Fatigue of the Composite Material for Rolling Bearings[J]. Journal of Materials Engineering, 1999, 0(1): 29-31.
This paper deals with a fatigue test of the composite material for rolling bearings,and analyses the fatigue life and fatigue failure of glass-fiber/nylon 66 composite rolling bearings formed by injection The valuable testing method is obtained for the design and application of composite rolling bearings.
Li Xinshan, Cheng Jinrong, Meng Zhongyan. Preparation of PZT TiNi Using Sol-Gel Techniques[J]. Journal of Materials Engineering, 1999, 0(1): 32-34.
Piezoelectric Pb(Zr,Ti)O3 thin films on shape memory alloy TiNi substrates prepared by sol-gel process were investigated.Lead acetate,zirconium isopropoxide and titanium n-butyloxide dissolved respectively in a solvent were mixed under nitrogen to form a precursor solution.The resultant solution was spun onto the TiNi SMA substrates at 2000 r/min for 30s.The amorphous thin films were crystallized by annealing at an appropriate temperature in air.It was found that the crack-free PZT thin films were of good mechanical bonding with the TiNi substrates.
Chen Zhiqiang, Han Yafang, Zhong Zhengang, Wei Pengyi, Yan Minggao. Prediction of Larson Miller Curve of Nickel Base Single Crystal Superalloys[J]. Journal of Materials Engineering, 1999, 0(1): 35-37,31.
A new prediction method of Larson Miller curve of nickel base single crystal superalloys was proposed This method was applied to the prediction of Larson Miller curves of the available nickel base single crystal superalloys Compared with the experimental results,it was found that this method can successfully predict the Larson Miller curves of nickel base single crystal superalloys.
Liu Qingquan. Analysis on Deformation and Cracks of an Engine Stage Ⅱ Nozzle Vanes[J]. Journal of Materials Engineering, 1999, 0(1): 38-41.
The paper gives analysis to the tests on deformation cracks and fracture of an engines nozzle vanes done by metallographic and scan electromicroscope methods The results show that the non-unibormity of engine temperature fields and the partial high temperature lead to overheat of the nozzle vanes and result in deformation and cracks.
Zhang Jianfeng, Zheng Qiang, Zheng Caixia, Yi Xiaosu. Progress in Study of Crosslinking of Polyethylene by Irradiation[J]. Journal of Materials Engineering, 1999, 0(1): 42-45,34.
The most typical application of irradiation technique in polymeric materials is the crosslinking of polyethylene The principle of irradiation dealing with the change of polyethylene structure, particularly the change of crystalline morphology is introduced The effect of crosslinking by irradiation on mechanical properties of polyethylene is also discussed.
Jiang Zhiqiang, Xi Shoumou, Li Hualun. Research and Development Trends of Plasma Sprayed Ceramic Coating by Laser Remelting[J]. Journal of Materials Engineering, 1999, 0(1): 46-48.
The defaults of plasma sprayed ceramic coating and the disadvantages of plasma sprayed ceramic coating by laser remelting are concluded in this paper.After analyzing the course of those problems,the ways to prevent producing of cracks,porosities and breaking off of plasma ceramic coating are proposed.
