Materials Literature
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The joining of graphite, ceramic SiC and Cf/SiC composites via preceramic silicone resin(SR) at high temperature (800-1400℃) was studied. The curing and pyrolysis process of SR, pyrolysis temperature, inert and active fillers were especially discussed. The results show that the curing process of SR was accomplished by…
The disadvantageous effects of colloidal SiO2 layer and micro-content of metal oxide adsorbed on SiC powder surface on SiC slurry stable dispersion were studied, and the novel method to avoid this disadvantage was proposed. By acidwashing, on the one hand, because the maximum Zeta potential of SiC powder increases to…
A mechanochemical reconditioner package has been investigated in our laboratory which could be used to generate an in situ protective layer on worn metal surfaces as a result of mechanochemical reactions between worn tribosurfaces, wear debris and a special reconditioner formulation. The main constituent in the recond…
On p-doped GaAs(100) surface, the band bending arising from Fermi-level pinning significantly affects the carrier and spin dynamics. In this paper, we report th e dynamics of spin polarization of p-doped GaAs(100) by using the time-resolve d and the energy-resolved two-photon photoemission techniques. By measuring the…
olyaniline and polypyrrole are two conducting polymers that show ion-exchange properties. Due to their easy processibility, they can be used for surface modification of different substances. For instance they can be coated on silica particles. In this work anion-exchange properties of polyaniline-coated silica gel for…
The aim of this paper is to understand the statistical inception mechanism of the first corona in positive non-uniform air gaps ranging 0.3˜1.0 cm. We calculated first how the spatial distributions of negative ion density depend on the gap length, UV irradiation and the concentration of water vapor using the steady st…
We consider anisotropic colloidal particles immersed in a solution of long, flexible, and non-adsorbing polymers: For the dumbbell shapes of recently synthesized particles consisting of two intersecting spheres, and for lens-shaped particles with spherical surfaces; we calculate the isotropic and anisotropic interacti…
In power systems, there is an ever-increasing demand placed on porcelain insulators especially for outdoor applications. Additionally, the huge cost of importation has resulted in a growing need for the local manufacture. To this end, an electrical porcelain insulator was manufactured from locally available raw materi…
We study the purely relaxational critical dynamics with non-conserved order parameter (model A critical dynamics) for three-dimensional magnets with disorder in a form of the random anisotropy axis. For the random axis anisotropic distribution, the static asymptotic critical behaviour coincides with that of random sit…
Nowadays, the modification of polymers covers radiation cross-linking, radiation induced polymerization (graft polymerization and curing) and the degradation of polymers. The success of radiation technology for the processing of synthetic polymers can be attributed to two reasons, namely the easiness of processing in…
An investigation on static modulus of elasticity of an M20 grade design mix of concrete with addition of four different percentages of steel fibre has been reported. The mix proportion 1:1.40:3.30, (w/c = 0.44) for M20 grade of concrete has been considered as reference mix. An addition of superplasticizer for increasi…
-glucose, and is prepared by the alkaline deacetylation of chitin obtained from crab shells. Chitosan has become of great interest not only as an underutilized resource, but also as a new functional material with high potential in various fields, such as environmental and biomedical engineering (Dodane and Vilvalam, 1…
This paper studies crystallization rule of oxidized pellet based on mineralogical compositions and microstructure under different technological conditions. The research showed that the progress of crystallization can be divided into three stages, i.e coarse-grain, developing crystal and interconnection crystal. The re…
Irregular β-SiC particles were prepared by a sol-gel and carbothermal reduction route,in which(tetraethoxysilane) and phenolic resin were employed to prepare carbonaceous silicon xerogels,the precursor of the SiC.The samples were characterized by XRD,FTIR,SEM and BET.Results indicated that β-SiC was not produced in th…
The effects of yttrium on the microstructure and mechanical properties of AZ91 magnesium alloy were studied in this paper.The experimental results show that magnesium alloy (Mg-7.5Al-0.7Zn-0.15Mn-xY) organization is composed mainly of α(Mg) matrix,β(Mg_(17)Al_(12)) phase and λ(Al_2Y) phase.The Y with fixed quantity wi…
Non-isothermal crystallization behaviors of the composites consisted of poly(phenylene sulfide) and silicon dioxide nanoparticles were studied by means of differential scanning calorimetry.The Mo equation is firstly used to analyze the differential scanning calorimetry data.The results show that Mo equation can charac…
The joining of graphite, ceramic SiC and C_f/SiC composites via preceramic silicone resin(SR) at high temperature (8001400℃) was studied. The curing and pyrolysis process of SR, pyrolysis temperature, inert and active fillers were especially discussed. The results show that the curing process of SR was accomplished…
Ti2SnC dispersion-strengthened (DS) copper matrix composites were prepared by the hot-pressing method. The change of microstructure, mechanical properties, and electrical resistivity of the composites as a function of Ti2SnC volume fraction were studied. The results demonstrated that the grain size of Cu decreased pro…
Feeder pipes in CANDU® reactors are an integral part of the circulating heat transport system, connecting the in-reactor fuel channels with the primary heat transport pipes. The feeder pipes are 1.5” to 3.5” in nominal size and made out of SA-106 Grade B material. A typical CANDU 6 station has 760 feeder pipes, half o…
Permanent mould casting may be regarded as a near net shape manufacturing process where simple to very complex shaped engineering components are fabricated with high degree of precision in a metallic mould. In this group High Pressure Die Casting, HPDC, have attracted more attention because of its production rate, whe…