LI Xiaohong, ZHONG Qunpeng, CAO Chunxiao, MAO Wei. Research on TLP Diffusion Bonding Technology of the DD3 Single Crystal Superalloy Two-halves Blades[J]. Journal of Materials Engineering, 2003, 0(6): 3-6.
An investigation of transient liquid phase (TLP) diffusion bonding of the first generation single crystal superalloy DD3 was presented. The interlayer alloy employed was an amorphous foil developed for DD3 alloy. The obtained stress-rupture property of the TLP bonded joints reached 90% of that of the base metal. The engineering feasibility of diffusion bonding of DD3 single crystal superalloy two-halves blades was also studied.
PU Yuping, LÜ Guangshu, LI Xiaojun, WANG Qiang. Influence of the Additives on Micro-porous Properties of Polyimide Matrix Composite[J]. Journal of Materials Engineering, 2003, 0(6): 7-10.
The effects of micro-pore parameters, pore size, pore distribution of polyimide matrix micro-porous materials was studied when correlated additives are added in it. 5% (mass fraction) MoS2, 5% Pb and 5% PTFE were added in polyimide powders of grain of 20μm separately at the pressure of 35-105MPa to mold beforehand by molding-pressure process, micro-porous materials were prepared by hot pressing and consolidation in vulcanizer. Pore parameters was measured through foam-diameter instrument. The results show that all pore parameters have changes when 5% MoS2, Pb, PTFE are added, and pore size distributions are disperse obviously, especially the disperse of PTFE is more obviously.
LI Xiaogang, LI Hongyun, HU Hongjun, YI Xiaosu. Studies on Rheological Behavior of Bismaleimide Resin for Resin Transfer Molding[J]. Journal of Materials Engineering, 2003, 0(6): 11-14.
The viscosity of resin is one of important parameters for resin transfer molding. Rheological behaviors of a bismaleimide resin for resin transfer molding was systemic studied in this paper. A rheological model based on dual-Arrhenius equation was established and used to simulate rheological behavior of this resin. The established viscosity of the model was in good agreement with the results of experiments. The manufacture technology of the bismaleimide resin that is most important for resin transfer molding was forecasted and controled.
CHEN Xiaodong. Methods for Dispelling Weld Residual Stress in Pressure Vessel[J]. Journal of Materials Engineering, 2003, 0(6): 15-17.
The different methods of dispelling weld residual stress in pressure vessel was introduced. Based on references and project experience, the principles of chosing method to dispel weld residual stress were given.
JIA Xinyun, LIU Peiying, TAO Ye. Oxidation Behavior of Ti60 Alloy at 650-750℃[J]. Journal of Materials Engineering, 2003, 0(6): 18-22.
The oxidation of Ti60 alloy (Ti-5.6A1-4.8Sn-2.OZr-1.OMo-0.85Nd-0.34Si) has been investigated. Thermodynamic and dynamic laws were studied by means of calculating the oxidation weight gain, oxidation rate constants and activities. The microstructure and morphology of oxidation scales on surface were examined with XRD and SEM. The element profile along oxidation layer was studied by AES to understand the diffusion behavior. The results indicate that Ti60 alloy exhibited the parabolic rule of oxidation rate at 650℃ and 700℃, but obeyed the parabolic-linear rule at 750℃, The oxidation scales are composed of TiO2 and A12O3. The morphology of oxidized surface possesses grill-like structure because α phase, β phase, and α/β interface are different in oxidation rate. Oxidation of rare earth phases is more serious than that of substrate.
WANG Guofan. The Intergranular Corrosion of Cubic 1Crl8Ni9 Steel Welding Pipe in the Air[J]. Journal of Materials Engineering, 2003, 0(6): 23-24,28.
The intergranular corrosion of bracket support of solar energy heat pipe was studied by electrion probe and direct-reading spectrometer. The composition and structure of corrosion product were analysed. The reason of intergranular corrosion was researched and some protective measures were proposed.
HE Shan. Performance Test of Radar Absorbing Materials[J]. Journal of Materials Engineering, 2003, 0(6): 25-28.
The performance test of radar absorbing materials (RAM) was necessary for the RAM research. In this paper, the common methods and measurement systems were introduced,from which, some parameter such us permittivity, permeability and reflectivity could be obtained. They were beneficial to RAM research.
ZHAI Huazhang, LI Jianbao, HUANG Xiangdong, DAI Jinhui. Anisotropy of Ceramic Diffusion Enhanced by Microwave Non-thermal Effect[J]. Journal of Materials Engineering, 2003, 0(6): 29-31,35.
Three pieces of Cr2O3-Al2O3/Al2O3 double-layered pellets were set in microwave chamber in three ways perpendicularly to each other. After specimens were sintered in microwave at 1580℃ for 30 minutes, the tracer Cr3+ ion cross-section of specimens were analyzed by XEDS. The diffusion distances of Cr3+ ion into other side in the direction of microwave oscillations were greater approximately 28% than that in the microwave propagating direction. The anisotropic diffusion was caused by polarized electric field of microwave superimposed on the chemical potential of tracer ion during microwave heating. The intrinsical diffusion in ceramics sped by microwave non-thermal effect was explained through that the microwave field influence on the charged particles. The relationship of diffusion flux in the microwave field JM and heat-driven lattice oscillation diffusion flux JC was also educed.
ZHAG Guangan, LUO Shoujing, TENG Dongdong. The Effect of Plastic Working on Micro-structure and Properties of Csf/Al Composite[J]. Journal of Materials Engineering, 2003, 0(6): 32-35.
Short fibre reinforcement Al-base composite can be manufactured various pieces by plastic working, but process of plastic deformation plays import role on micro-structure and properties of materials. In this paper, greens of Csf/Al composite were prepared by extrusion infiltration, and it was studied the effect of deformation temperature and deformation extent on micro-structure and properties of materials by extrusion. The results show that definite deformation could stitch micro-core resulting from imperfection infiltration and make short fibre array at a direction, so improve properties of the composite; however large deformation made short fibre break and deteriorated properties of the composite; properties of the composite became better and better with the rise of deformation temperature.
CHU Zengyong, FENG Chunxiang, SONG Yongcai,WANG Yingde, WANG Jun, XIAO Jiayu. Improved Tensile Behavior of the Continuous SiC Yarns Pyrolyzed from Polycarbosilane under Tension[J]. Journal of Materials Engineering, 2003, 0(6): 36-37,40.
Preparation of polymer-derived SiC fibers involves a pyrolysis process, in which great weight loss and shrinkage are usually recorded. As a result, stress concentrates on the bend portion of the fibers and then lower their tensile strength. To avoid the bend portion and stress concentration, a pyrolysis under tension, as well as their effect on the tensile behavior of SiC yarns was studied. Results revealed that so-obtained SiC fibers are straight and parallel to each other. The crack load of SiC yarns is much increased, or in another word, their weave capability is much improved.
ZHENG Shijian, SU Zhengtao, WANG Juyuan. Study on Heat-resistant of Hot Setting Silicone Rubber Adhesive[J]. Journal of Materials Engineering, 2003, 0(6): 38-40.
The adhesive is made of silicone rubber by adding VTPS and metal oxide. The method can improve adhesion strength and heat resistance of adhesive, overcome the difficulty of bonding between silicone rubber and metal. Adhesion strength of cohesive body reached above 2.5MPa at room temperature and 0.83-1.45MPa at 300℃ Maximum application temperature will get to 350℃.
WANG Jigang, GUO Quangui, LIU Lang, SONG JinRen. Relationship Between the Chemical Constituents and Bonding Strength in high Temperature Adhensive Interface[J]. Journal of Materials Engineering, 2003, 0(6): 41-43,48.
The high temperature adhesive was prepared using phenol-formaldehyde (PF) resin as matrix and boron carbide as additive that showed satisfied bonding properties for graphite. Subsequently, the graphite components bonded by the above adhesive were heat treated at different high temperatures. By means of X ray photoelectron spectroscopy (XPS), the composition of elements contained as well as its changes was studied, and the influences on the bonding properties were also discussed. The results show that carbon, boron and oxygen are the basic elements at bonding interface. The amorphous carbon produced from PF resin works as the framework of cements and its change has marked effects on the stability of cement. In addition, boron exists on the adhesive interface as the form of B4C or B2O3, and the existing forms have marked influence on the performance of graphite's bonding.
ZANG Weiguo, LIU Hengquan, BAN Chunmei, YU Bitao, YAO Suwei. The Progress of Preparation of Composite Nanostructured Films by Monolayer-induced Electroless/Electrodeposition[J]. Journal of Materials Engineering, 2003, 0(6): 44-48.
The recent developments of preparation of composite nanostructured films by monolayer-induced electroless/electrodeposition methods are introduced. The mechanism and technological conditions of methods are stated. The structure characterizations of films prepared in addition to the further developments are discussed.
