Location: Home > Engineering Science >
-
Damage Mechanism of Carbon Fibers During Preparation of Ceramic Matrix Composites by Precursor Infilt
Focusing on serious damage of carbon fibers in ceramic matrix composites (CMCs) prepared by precursor infiltration pyrolysis (PIP), and with emphasis on carbon fiber reinforced silicon carbide composites (Cf/SiC) derived from polycarbosilane....
-
Characterization of Resin Matrices for Advanced Composites
The physicochemical characterization was made in depth using various techniques for some resin matrices of advanced composites, such as epoxy resin matrix, phenolic resin matrix and bismaleimide resin. These techniques include infrared spect....
-
Fabrication, Microstructure and Mechanical Behavior of Functionally-Graded SiC Particulates Reinforce
SiC participates reinforced Al matrix composite is one of advanced metal matrix composites (MMCs), having widespread prospect of applications. Since its excellent strength at high temperatures, good wear resistance, high specific modulus and....
-
Study on Preparation of pH-sensitive Porous Hollow Gel Fiber Based on Ultrahigh Molecular Weight Poly
As an important smart materials, pH-sensitive polymer gels have received increasing attention in materials research communities. However, most of the polymer gels studied so far are bulk samples, and some properties of these gels, such as me....
-
Failure Mechanisms of Ballistic Resistant Material and Decay of Its Fibers
Nowadays, it's of great interests to investigate the ballistic resistance and failure mechanisms of personal body armor (including bulletproof vest and helmet), which is mainly made up of high tenacity, high modulus and high performance fibe....
-
Properties of TiNiNb Shape Memory Alloy and Optimal Design for Its Application as Pipe-connector in I
Pipe-connector made from Ti44Ni47Nb9 shape memory alloy has been considered to be good component to connect the titanium alloy tube with the stainless steel tube in nuclear powered naval vessels. Comparing to the conventional techniques, sha....
-
Laser Cladding and Laser-induced Self-propagating Synthesis of Zr-based Amorphous Alloys
In recent years, there have constantly been breakthroughs in the research of bulk amorphous alloys. The amorphous alloys with large glass-forming ability have been found in a number of alloy systems such as Zr-based, Ln-based, Ti-based, Mg-b....
-
Production of Amorphous from Stable Quasicrystals
Quasicrystals (QCs) consist mainly of icosahedral clusters. The local atomic configurations in amorphous metallic alloys comprise mainly close packed atomic configurations. Icosahedron is also one of the thermally stable clusters in these co....
-
Failure Waves in Alumina Ceramics Subjected to Shock Compression
Ceramics are extensively used in national defense engineering and military science with their excellent physical and mechanical capabilities, so it is a widely attentional subject in dynamics circles to research on the dynamic responses and....
-
Studies on the Synthesis,Charaterization and Binding Mechanism with DNA of Electroactive Metal Comple
Deoxyribonucleic acid (DNA) is an important genetic substance in organism. As the basis of genetic expression, it plays an important role in the process of storing, copying and transmitting germ messages. Serving as a target molecule, the re....
-
Design and Synthesis of Novel Sulfamide-Amine Alcohols and Their Applications in Asymmetric Catalysis
Herein, using grafting strategy we have developed a new kind of sulfamide-amine alcohol (SAA) ligands by grafting a activator (sulfonamide fragment) to the traditional aminoalcohols, which led to more rigid tridentate coordination model and....
-
In-situ Synthesis and Tribological Characteristic of Nanoparticles Possessing the Particularity of Ul
Nanomaterials, often referred as research forward field of materials science, have widely applied foreground because of their special physical and chemical properties. The dispersion capacity and stability of nanoparticles in water or oil-so....
-
Study on the Preparation of Functional Composite Superfine Particles
With 2,2' -azobis-2(amidineopropane) dihydrochloride (V5o) and ammonium persulphate (APS) being used as initiator, the cationic and anionic nanoparticles polystyrene (PS) latex were synthesized via emulsion polymerization respectively. Then....
-
Research on Pulsating Electric Current Effect of Synthesis and Deformation of Ni/Al and Ti/Al System
Being a new generation of high temperature structure materials, Ni/Al and Ti/Al system intermetallic compounds are most potentially. They possess many excellent capabilities at high temperature such as high strength, corrosion resistance, co....
-
Mechanism Research on Blasting Damage and Fracture of Bedded Composite Rock and Its Engineering Appli
The blasting damage and fracture process of rock is complicated dynamic evolvement process. Owing to inborn high temperature and high pressure gas after blasting and complexity of dynamic principal relationship and interact ional complexity....
-
Movement Evolution of Failured Overburden Infullenced Obiviously to the Ground Pressure Around Workin
The dissertation has studied in detail the main forms of failured overburden including separation, crevice, penetrating crack and collapse, and the processes of overburden failuring above longwall working face in the coal mine by using the m....
-
Theory & Technology of Rock Mass Hydraulics in Coal Mining Above Aquifer
Many colliery in our country suffers from the Ordovician period Karst containing water outburst frequently due to the complex geology condition, so the engineering geology, hydrology, the deformation and breakage law of upper and down floor....
-
Research of Materials' Non-equilibrium Non-linear Action and Numerical Simulation
It have been attention to simulation of the alloy solidification, it's our expectation that could predict the distribution of alloying elements, structure and properties according to system numeration. The article discusses the temperature-f....
-
A Study of the Structures of Some Crystalline Approximants of Quasicrystals
Al80.6Cr10.7Fe8.7 or approximately Al4(Cr,Fe), Immm (No. 71), a = 1.2500(6) nm, b = 1.2617(2) nm, c = 3.0615(8) nm, V = 4.8284 (8) nm3. Pearson symbol oI366-59.56, Dx = 3.432g/cm3, R1=0.0674 for 3206 reflections with I>4σ(I), goodness of fi....
-
Formation of Intermetallic Phases in Al-rich Part of Ternary Alloy Systems Containing Transition Meta
The work is dedicated to the problem of forming abilities of stable quasicrystals (QCs) in the Al-based ternary alloy systems.QC is an ordered solid with a non-crystallographic rotational symmetry and quasiperiodic translational order. Metas....
-
The Theoretical、Experimental & Practical Research on Rheological Forming of Metals
The theory of rheological forming, a deformation theory of greater universal significance, has been developed recent years based on the theories of plastic forming, superplastic forming and creep forming. It is the practical application of r....
-
Fatigue Behavior Investigation on New Types of Titanium Alloys Bearing Hydrogen
The study fruits in relation to fatigue theory put forward by former researchers were introduced in this paper, especially, the theoretical and practical developments in aspect of effects of hydrogen on fatigue characteristics of titanium al....
-
Research on Compressive Creep Behavior of the High Aluminum Zinc Based Alloy
Among zinc-aluminum cast alloys, ZA27 alloy exhibits attractive physical and mechanical properties combined with good friction and wear resistance, making it a bearing alloy replacing of some copper alloys, also this alloy tend to be used wi....
-
Theoretical Research on Mechanism of Magnetic Phase Transition for Room Temperature Magnetic Refriger
In this dissertation, the theoretical research on the mechanism of the magnetic phase transition for the room temperature magnetic refrigeration -GdSiGe alloys and their nano-calculations are presented. Firstly, a large number of researches....
-
Theoritical, Experimental and Molecular Simulational Study on the Association of Alkanols
Molecular association is a spontaneous and equilibrium process by which molecules associate to form complexes and/or aggregates under specific conditions. These phenomena are widely found in biological and non-biological systems. The study o....
-
Studies on the Coordination Chemistry of Novel Functionalized Diazamesocyclic Ligands
In order to systematically investigate the coordination chemistry of the diazamesocyclic ligands, the typical 1,4-diazacycloheptane (DACH) was selected as the backbone to further our study, based on the results of our previous work. Firstly,....
-
Theoretical Studies of Collision-induced Energy Transfer within Diatomic Molecules in Excited States
Collision-induced quantum interference(CQI) effects within singlet-triplet mixed states were demonstrated in the energy transfer processes of CO(A1,v=0~e3∑-,v=1) + M (M= He, Ne, Ar or HCl) and Na2 (A1∑u+, v=8 ~ b3 0u, v=14) +Na(3s). For....
-
Nonadiabatic Calculation for the Reaction of F(2～P) with H_2 and Its Isotopic Variants
As the paradigm for exothermic triatomic reactions, the reaction of F(2~P) withH_2 and its isotopic variants are important elementary reactions in gas phase reactiondynamics. The nonadiabatic time-dependent wave packet and RPD (reactant-prod....
-
Photodissociation Dynamics of CH_3 Radical and High Resolution Spectroscopic Study of the S-R(0,0) Ba
Photodissociation dynamics of the CH_3 radical at 212.5 nm excitation hasbeen studied experimentally using the H atom Rydberg tagging time-of-flightmethod. Photodissociation of CH_3I at 266nm was used to generate pure CH3radical. Product tra....
-
Application of SAFT Association Model for Spectroscopic Properties of the Associated System
Molecular association is a spontaneous equilibrium process by which molecules associate to form complexes or aggregates under specific conditions. These phenomena are widely found in biological and non-biological systems. The study of proper....