Abstract:This paper will give a comprehensive introduction of the ZN Series damping materials developed by ARIMT and also a brief description of several application examples in various damping structures

Abstract:Present status of studies on High Strain Rate Superplasticity (HSRS) of Metal Matrix Composites (MMCs) is introduced,including tensile and compression superplastic deformation.The fabrications of different composites,the conditions for obtaining HSRS and the characteristics of superplastic deformation are smnmarized.The deformation mechanisms of MMCs,especially that reinforced by particles,are discussed in detail.Problems of current research and some suggestions are also presented in this paper.

Abstract:Main reasons why flame retardant materials and flame retardants are widely used and rapidly developed are reviewed.The flame retarding characteristics and applicable area are analyzed for the flame retardant materials,such as halogen systems,organic phosphorus systems,phosphorus-nitrogen systems (intumescent flame retardants) and organic silicate systems.Particular attention is focused on retarding mechanism and retarding characteristics of the intumescent flame retardants and their development.To overcome drawbacks of the halogen flame retardant systems and improve their environment effects,some new non-halogen,low smoke,low toxic,and high efficient flame retardants and flame retarding technique are being developed,and it is considered that the research and development of intumescent flame retardants and organic silicate retardant systems will be one of the hottest research field in the 21 st century.

Abstract:Electrorheological(ER) fluid is one kind of intelligent materials with great application potential.In this paper,recent advances in material aspects of ER fluids are reviewed.Properties and problems of different ER systems such as simple dispersed phase ER fluids,composite dispersed phase ER fluids and liquid crystalline polymer ER fluids,are analyzed.To give recent development in ER materials and to promote development of the new ER materials,more emphases are given on liquid crystalline polymer ER fluids and composite dispersed phase systems,which have received extensive interests in recent years.

Abstract:Many factors such as infrared detecting technology,laser detecting technology ,electron war and so on,make the stealth technology important in the infrared region.It is a difficult problem for heat balance theory to gain the stealth compatibility of infrared and laser in the same wave band.To achieve the compatibility,the conflict demands for infrared and laser stealth materials has to be overcome.Two stealth mechanisms are first introduced separately and a method of compatibility stealth is proposed.On the basis of the mechanism of stealth in infrared and laser,restriction and possibility of the compatibility of the two methods of stealth is analyzed in this paper.

Abstract:The problem of polarity effect in EDM is researched in this paper.In order to find out deterioration of anode and cathode,experiment with single pulse is taken in kerosene oil.The deterioration of anode is found larger than that of cathede even in the condition of large pulse width,which is contradictory to deterionition in EDM machining with continuous pulses.This phenomenon above may be explained through analyzing the movement of electron and positive ion in plasma canal.

Abstract:The high temperature fatigue behaviour and the effect of cyclic frequency on the behaviour of CMSX-3 Nickel:based single crystal superalloy are investigated by MTS machine,metallograph,SEM and TEM.The results show that the increase of cyclic frequency would decrease high temperature fatigue lifetime of the alloy and result in different deformation mechanism.

Abstract:Mechanical properties of the B/A1 composites exposed in hot air up to 300℃C,.500＄ are investigated.Experimental results show that thermal treatment at 300℃ may result in less decrease with tensile strength remained about 72% ,and ultimate strain remained 74% after 100 h ,for example ,but thermal treatment at 500℃ only for 5 h can significantly decrease the tensile strength of the B/Al composites.Failure mode of the composite also changes from cumulative to typical noncumulative after long time exposure at 500℃.Interfacial microstructure and phase composition of the B/Al composite before and after exposure is studied by TEM and SEM.It is showed that interfacial reaction is the main reason of decrease ofmechanical properties of the B/M composites.

Abstract:Oxygen gas diffusion electrode is one of the key factors of electrochemical CO2 concentrator,therefore,further studies on catalytic ability of O2 electrode are beneficial to increasing of CO2 transfer index and velocity.Preparing process of the oxygen gas diffusion electrode is improved by means of the pretreatment of active carbon and the selection of preparing method of Pt/C powders.Based on analysis of orthogonal experiment results,the optimum preparing conditions of PL/C powder in O2 electrode are achieved in this paper.

Abstract:The curing agent for epoxy is synthesized by reacting hexamethylenediamine with acrylonitrile.Synthesis method has been improved.The compositions of the curing agent are analyzed with infrared spectroscopy,mass spectroscopy and nuclear magnetic resonance.It is found that when.the reaction between hexamethylenediamine and acrylonitrile is carried out in the mole ratio of 1: 1,main product of the mono-cyanoethylation hexamethylenediamine and by-product of the bicyanoethylation hexamethylenediamine is produced at same time.

Abstract:Heat-resistant resin for RTM process is prepared,which could be used for missile radomes.Viscosity of the resin is only obout 200 mPa· s after 8 h at 100℃,which is very suitable for RTM process.The cured resin has good heat resistance with Ts of 269℃ and weight loss of 10% at 430℃.Flexual strength of 139 MPa and modulus of 9.5 GPa at 300℃ is obtained for quartz fiber/resin composite,which could be used for a short term at this temperature.

Abstract:Precursor polymers to manufacture Si-C-O fibers are prepared by thermal rearrangement reaction of Polyvinylchloride(PVC) and Polydimethylsilane.The precursor polymers are characterized by element analysis and IR.Test results show that the copolymer —(SiCH3H—CH2 )n—( CH＝CH).m— is obtained when high PVC content is added to reactive system.The Si-C-O fibers with low resistivity of 100 Ω·cm are obtained through melt spinning,infusibi-lization and heat treatment of the precusors at high temperature,while SiC fibers with high resistivity of 106Ω·cm may beobtained by polycarbosilanes.

Abstract:Fabrication of carbon fiber reinforced carbon-ceramic matrix composites by chemical vapor infiltration (CVI) and liquid impregnation of organic precursors is presented in this paper.Mechanical properties,ablation protection and oxidation resistance of C/C-SiC are characterized.Research results show that C/C-SiC composites with comparable fracture behavior and flexure strength to those of C/C materials,have better ablation protection and oxidation resistance.It is provided a technical approach to manufacture the carbon-ceramic composites which have comparable properties not only to that of C/C materials,but also to that of ceramics.

Abstract:Polytitanocarbosilanes(PTC) with different C content are synthesized by polysilane(L.PS),polyvinyl chlo-ride(PVC) and Ti(OBu)4.The syntheses,composition and structme of the PTC with rich carbon are studied and the in-fluence of PVC content on the syntheses,composition,structure and properties of PIC is discussed by IR,GPC,VPO,TG.From these precursors,Si-Ti-C-O fibers with specific resistance of 1 Ω*cm ～ 103 Ω*cm are manufactured by melt spin-ning,curing in air and sintering at high temperature.