Papers by Keyword: Nano-Size ZrO₂ Powder

Abstract: Nano-Sized ZrO₂ Powders Were Synthesized from ZrOCl₂•8H₂O by Polyvinyl Alcohol-Gel Technology, Using Polyvinyl Alcohol (PVA) as a Monomer and Glutaraldehyde (GA) as a Cross-Linking Reagent. The Stability of the Gel Was Affected by Concentration of PVA and GA, Volume of ZrOCl₂•8H₂O. Moderate Strength of Gel Was Synthesized by Raw Materials of PVA (2%), ZrOCl₂•8H₂O (30~40 g) and GA (10ml). Nano-Sized ZrO₂ Was Obtained Finally, with Uniform Particle Size and Good Dispersibility, and Size Was about 20 nm. Doped ZrO₂ with Stabilized Tetragonal Crystal Was Obtained at Room Temperature. The Effect of Calcine Temperature on Phase Structure of ZrO₂ Powders Has Been Investigated.

Abstract: Cr-Fe-ZrO₂ composite coatings were electrodeposited in trivalent chromium chloride electrolyte containing glycine as complexing agent. The effects of electrodeposition parameters such as current density and electroplating time on appearance, surface morphology and composition of the Cr-Fe-ZrO₂ composite coatings were investigated mainly. The obtained Cr-Fe-ZrO₂ composite coatings were characterized by means of scanning electron microscope (SEM) and energy disperse spectroscopy (EDS) techniques; the appearance quality was evaluated by range estimation; and the bonding force was analyzed by bending tests. The SEM results showed that the nano-size ZrO₂ powder were fairly distributed through out in the composite coating, and the composite coating contained only few fine cracks. The EDS results indicated that the composite coating contained chromium, iron, zirconium, oxygen, carbon and chlorine. The deposited coating was glossy and the results of bending tests showed that the bonding between the composite coating and the substrate was good