Materials Literature
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Additives powder was calcined under different temperature schedules and then ZnO varistor ceramics were prepared. The effects of additives calcination on the ceramics were studied by TG-DTA, SEM and XRD, and the electrical properties of the prepared varistor ceramics were measured. The results show that a homogeneous…
Periclase-spinel materials were prepared by fused-magnesite,spinel and Al powder as raw materials.This materials bonded by non-oxidate of Mg-Al-( Si)-O-N was excellent with good heat shock resistance and slag resistance were obtained.The reaction mechanism at high-temperature of Al in this system was studied,that meta…
This article analyzes the effect of different alkali sources on the synthesis of MCM-22 molecular sieve when Na Al O2 is used as the aluminum source.When KOH is the alkali source,the K/Si O2 range for synthesizing pure-phase MCM-22 molecular sieve becomes narrower.After a hydroxyl oligomer is introduced in the system,…
The effect of surface mechanical pressure-torsion(SMPT)on the microstructure and mechanical properties of the surface of T2 pure copper were studied by means of metallographic microscope,friction and wear testing machine(Universal Micro Tribometer,UMT)and microhardness tester.The surface grain size of T2 pure copper s…
By adjusting the content of hydrophilic and hydrophobic components of epoxy resin curing system and adding the appropriate fillers and additives,the repairing materials which had good adhesion with carbon steel underwater was developed. For carbon steel by surface treatment grade 2. 0,shear strength achieved 14 MPa un…
Amorphous Ti O2 nanotube was prepared on titanium sheet by anodization and its surface morphology is characterized by SEM. The water contact angle on Ti O2 nanotube is gauged by JGW-360 A contact angle measuring instrument and the factor on hydrophilicity of nanotube is studied including illumination time,tube diamete…
Xylo-oligosaccharides and cello-oligosaccharides are benificial for health and they are usually prepared from crops,such as corn cob. In this work,sand-fixing pioneer plant,Tamarix ramosissima,was used as the raw material for preparing the xylo-oligosaccharides and cello-oligosaccharides. The 100 g dried Tamarix ramos…
以α-Al2 O3、金红石型TiO2和MgO为初始粉料，采用凝胶注模成形工艺制备了Al2（1－x）MgxTi1＋xO5固溶体陶瓷。将陶瓷试样浸泡到750℃的铝熔体中20 min，取出后用自来水冷却，测试热震后试样的残余抗弯强度，并研究了x值变化对固溶体陶瓷抗热震性的影响。结果表明，随x值的增大，陶瓷的抗热震性先快速提高后趋于缓慢。当x＝15％时，试样经5次热震后强度保持率为87％，具有优良的抗热震性能。
The ATP hydrolysis catalyzed by ATPase becomes the research hotspot in biocatalysis fields. In order to study the mechanism of ATPase catalysis,we mimic the biotic environment in this paper.Multi-functional dendrimer G1.0 PAMAM(L) as a ligand was synthesized by divergent method. The raw material was refluxed in methan…
Objective To explore an effective way to enhance cell adhesion to accelerate in vitro tissue engineering heart valve constructed.Methods To construct recombinant adenovirus vector Ad.FnCBD64 by fibronectin cell binding domain(FnCBD64)prokaryotic expression,extraction,sheep marrow stromal cells(BMSCs)in vitro culture a…
With unstable layered K2Ti2O5 as the precursor in the traditional preparation of solid phase sintering, nano/micro-composite TiO2(TiO2-m) derived from K2Ti2O5 was synthesized via ion-exchange. Supported MoO3/TiO2-m catalysts were prepared by incipient impregnation. Simultaneously, the properties of supports and cataly…
The material selection of gathering system of high sour gas field was of great significance for the safety and steady operation. The material selection should take into account the unification of safety and economy reasonable. Flow velocity,flow pattern,phase change of the medium in the pipe and other factors on corro…
After crosslinking,poly(lactic acid)(PLA)can own network structure,and crosslinking can effectively improve the thermal stability and mechanical properties of PLA.The main methods of crosslinking reactions,such as chemical crosslinking,irradiation crosslinking and molecular modification of crosslinking are summarized,…
By plasma cladding technology and with appropriate processing parameter,Fe-based alloy powder Fe-Ni-Cr-B-Si and Fe-Cr-B-Si were melt on the Q345,then a wear-resistant coating metallurgically bonded on the substrate was prepared.The microstructure of clad layer was investigated by optical microscope(OM),scanning electr…
To study the feasibility of preparing functional packaging composite from disused filter paper pulp by mechanical means. Mechanical methods including grinding and homogenization were used to separate 2 types of cellulose nanofibers(CNFs) in different sizes from the untreated and acetic acid-pretreated disused filter p…
Porous C/C preforms with different densities were prepared by chemical vapor deposition(CVD)and different periods of resin impregnation/carbonization(IC),and then liquid silicon was infiltrated into it at 1650℃and1800 ℃,producing a C/C-SiC composite.The morphology of porous C/C preform and C/C-SiC was observed by mean…
Thiophene and its derivatives are the main sulfur components of cracking petroleum.It is of great significance for fuel quality improvement and environmental protection to study hydrodesulfurization technologies of thiophene.Mg/C composite for hydrogen storage was prepared by reactive ball milling method under H2 atmo…
In this paper,the rolling process of external-threaded pipe by three-roll cross rolling mill were analyzed,the reduction,thread lead angle,feed angle and other parameters influencing on product quality were put emphasis on.
Based on the test process of differential scanning calorimetry, the influences of the size andamount of polypropylene chips on thermal behavior are researched. The results show that increasing thesample size or the sample amount will lead to the melting peak temperature increases, while melting enthal-py will have a s…
ZnO nanoparticles with high crystallinity are synthesized through a modified polymer-network gel route. The microstructures,morphologies and optical properties of the obtained samples are characterized by XRD,SEM,XPS,PL and UV-vis. The results indicated that the nanoparticles are wurtzite ZnO with the particle-diamete…