نتایج جستجو برای: preform
تعداد نتایج: 549 فیلتر نتایج به سال:
Ti3SiC2 bulks were synthesized using Si melt infiltration into porous preforms with different chemical compositions. The initial composition of the preforms was prepared on the basis of the TiC, 2TiC/Ti, 3TiC/0.3Si, 3Ti/2C (carbon active) and 3Ti/2C (graphite) formulations and was pressed into pellet using a cold press method. The Si ingots were weighed 3 times the stoichiometric value and in o...
This study used finite element analysis software DEFORM-3D to analyze the preform formability and die stress in pre-forming process of forging automobile transmission components. The materials are AISI- 5120 alloy steel JIS-SKD61 mould steel, respectively. research investigated phenomenon folding defects at end final process. First, as shape under pre-formed channel was designed change, its clo...
A numerical solution for the simulation of chemical vapor infiltration of ceramic matrix composites is presented. This computational model requires a 3D representation of the preform. Gas transport and chemical reaction are simulated by a Monte Carlo random walk technique. The developed algorithm can also be used for determination of effective transport and reaction properties in a porous mediu...
A new route was recently proposed to modify some spectroscopic properties of rare-earth ions in silica-based fibers. We had shown the incorporation of erbium ions in amorphous dielectric nanoparticles, grown in fiber preforms. Here we present the achieved stabilization of nanometric erbium-doped dielectric nanoparticles within the core of silica fibers. We present the nanoparticle dimensional c...
Laminated Si/SiC ceramics were synthesized from porous preforms of biogenous carbon impregnated with Si slurry at a temperature of 1500 °C for 2 h. Due to the capillarity infiltration with Si, both intrinsic micro- and macrostructure in the carbon preform were retained within the final ceramics. The SEM micrographs indicate that the final material exhibits a distinguished laminar structure with...
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