Highly pure and well-dispersed yttria nanocrystalline powders were synthesized with a modified coprecipitation method that uses mixed ammonium hydroxide-carbonate solution as the precipitant poly acrylic acid (PAA) dispersant. Comparing using same route but without PAA dispersant, PAA-assisted exhibit lower level of agglomeration better sinterability. Sintering trajectories dispersant investiga...

In this study, sinterability of WC-9% Co component with AISI 4340 steel insert was investigated using Inserted Powder Injection Molding (IPIM) method. Sintering experiments were performed at temperatures 1200 °C to 1350 dwell times 120, 240, 360 min. Defects such as gaps, cracks and macro-porosities observed in specimens, sintered 1250 for all times. It proved that sintering temperature high it...

The present paper briefly summarizes our recent research on high-temperature mass transport phenomena through grain boundaries in oxide ceramics. We have proposed two techniques to control boundary ceramics: one is change the chemical composition boundary, and other apply an external electric field or current material. former effect attributed segregation of doped cations, effective improving s...

Synthesis of YSZ nanopowder by alkoxide sol-gel method, through two different hydrolysis routes, one under careful control by using acetyacetone as ligand, and the other through basic hydrolysis, was investigated. The synthesized powders were characterized by various analytical techniques such as, XRD, STA, PSA, BET, SEM, and TEM. The results showed that, the YSZ powders prepared through the ba...