Materials Literature
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Super-fine powder of calcium and zinc substituted lanthanum chromite La0.7Ca0.3Cr0.95Zn0.05O3-δ(LCCZ) with an average particle size of 0.24 μm was synthesized by a combustion method.The electrical properties,stability in hydrogen,compatibility with LSM and thermal expansion behavior of LCCZ were investigated.The resul…
The synthesis conditions of silica microsphere were studied.By adding tetraethoxysilane(TEOS) and ethanol into the catalytic solution uniformly,the monodispersity and spherical degree of the achieved silica microspheres are ideal.When V(TEOS)∶V(NH4OH) is 1∶1,the silica microsphere monodispersity is better and the diam…
The amino-silicone microemulsion was prepared using amino-silicone oil(DC 8500),alcohol polyoxyethylene ether(AEO3,AEO9) and surfactant alkylethoxyglucoside(AEG) as raw materials. The influences of the type,match ratio and amount of emulsifier and pH on the amino silicone microemulsion were analyzed. By comparison and…
The Mg-5Sn-2Si alloy was modified by the Mg-20%Ca(mass fraction,the same below)and Mg-20%La master alloys separately.The modifying effects of Ca and La on the Mg2Si phase were investigated,and high temperature creep testing was conducted as well.The results showed that Ca and La had a good modifying effects on Mg2Si p…
Spray forming is a new metal material forming process.High alloy content steels,which can't be easily produced by conventional processes,can be produced by this technology.The microstructure of the M42 HSS(high speed steel)produced by spray forming and the effect of subsequent heat treatment and hot working on the ing…
Taking thiophene ethanol as end groups,and p-hydroxy benzoic acid of 11 olefine acid acyl oxygen radicals in the DCC/DMAP got the target under the condition of highly efficient etherification product,through nuclear magnetic,polarizing microscope( POM) on structure and properties of the product were characterized. The…
The surface of aluminum powder was coated and modified by KH-550, acrylic resin and their mixture. The acid resistance of differently coated aluminum powders was studied. It was found that the aluminum powder coated by KH-550 and acrylic resin has better acid resistance. The analysis of Fourier-transform infrared spec…
Spinel manganese-cobalt oxide( MnCo 2 O 4) powder was synthesized by a citric low-temperature self-propagating combustion method. The dense protective coatings were prepared by wet powder spraying on Crofer 22 metallic interconnect. The influences of process conditions on the coating were investigated. The phase struc…
High-grade syngas can be produced from the reforming of CH4 with CO2.To achieve efficient conversion of reforming reaction into syngas production,the reforming of CH4 with CO2 for syngas production was conducted in this paper under microwave irradiation,with biomass char as catalyst and microwave absorbing medium.The…
A new emulsion paint tripper was synthesized with methylene chloride as the primary solvent,benzyl alcohol and ethanolamine as assistant solvent,ethyl acetate as the inhibitor and the resolver,and ethylacetoacetate for penetrant.The ratio of components was determined by orthogonal experiments.The experimental results…
Let G be a simple graph with a(G) and G,its algebraic connectivity and complement graph.It is proved that it holds for the algebraic connectivity of Nordhaus-Gaddum type for a graph G whose cycle rank is 2 that 1 ≤ a(G) + a(Gc) by classification and con-crete reseach.
In this thesis, the main topic was to investigate the detailed biological roles of the isopropylmalate isomerase small subunit 1 (IPMI SSU1) as well as of the branched-chain aminotransferases 2 and 5 (BCAT2 and 5) in A. thaliana. For the analysis of IPMI SSU1 transgenic lines expressing an artificial microRNA targetin…
The fatigue properties of TC21 Ti-alloy for thin-wall tube specimen are investigated under uniaxial,tension-torsion proportional,non-proportional and variable amplitude loading.All tests are strain-controlled.The results indicate that cyclic softening behavior is shown for TC21 alloy under uniaxial and proportional te…
Based on the high hardness and certain toughness of B4C ceramics based composite materials,which matches well with the high hardness of B4C ceramics,a new kind of composite armor that consists of B4C plate and B4C based composite materials was designed.To make the best use of the high hardness of B4C plate and obtain…
The liquid-solid bimetal composite casting was adopted to prepare the high chromium iron and stainless steel.Stainless steel was enclosed in the center of high chromium cast iron.The microstructure and property of high chromium iron and composite interface were studied.The result indicates that elements diffusion form…
Titanium is a new shipbuilding structural material,which has excellent comprehensive properties,such as the low density,high specific strength,good workability,and excellent resistance to seawater corrosion.However,the titanium using shipbuilding material is handicapped by several critical disadvantages,including the…
Novel synthesis method of aromatic hydrazine by use of benzotriazole was reported.At first,the intermidates 1-arylformylbenzotriazoles were synthesized by reaction of benzotriazole and aromatic acid.And then,the aromatic hydrazines were prepared by hydrazinolysis of 1-arylformylbenzotriazoles with hydrazine hydrate,wh…
A review is provided of the research progress of anticorrosive polyaniline paint.The unique anticorrosion mechanism of polyaniline is briefed,and its application in corrosion-prevention of metals is summarized.It is pointed out that conducting polyaniline possesses reversible redox performance and can well prevent met…
The uniform CdS microspheres were synthesized by template-free hydrothermal method.The morphology and structure of CdS microspheres were characterized by XRD and SEM.The results indicated that the synthesis by hydrothermal method could avoid the S2-ion oxidation,the CdS microspheres of obvious quantum size effect and…
The microcrystalline cellulose is composed of the unlimited stream element crystal, and it is prepared by diluted acid hydrolysis of natural cellulose raw material and other series of processes with the limit degree of polymerization. As natural plant fiber raw material, the microcrystalline cellulose has already seen…