Abstract: The agglomeration state of nano-powders affects the microstructure of ceramic nano composites, and hence its optical and mechanical properties. In this paper, Y2O3-MgO nano-powder was synthesized by sol-gel method. Y2O3-MgO nano composites with excellent optical and mechanical properties were prepared by using hot pressing sintering (HP). The effects of the molar ratio of metal ions to citric acid (m/c) in the precursor on the agglomeration state of nano-powders and the optical and mechanical properties of the nano composites were studied. For the molar ratio of metal ions to citric acid of 0.75, the agglomeration state of the powder is the lowest. Y2O3-MgO nano composites prepared by hot-pressing sintering have an uniform phase domain, an average grain size of 140 nm, and an in-line transmittance of 80% within 3~6 μm wavelength range. Vickers hardness, fracture toughness and bending strength are 10.90 GPa, 2.21 MPa·m-1/2 and 226 MPa, respectively.
Key words: nano-powder, transparent ceramics, ceramic nano composite, Y2O3-MgO, agglomeration state, sol-gel, hot pressing sintering, citric acid
Declaration: This article is provided by CERADIR™ users or obtained from Internet, the content does not represent the position of CERADIR™. We are not responsible for the authenticity/accuracy of the article, especially the effects of the products concerned. This article is for study only, it does not constitute any investment or application advice. For reprinting, please contact the original author. If it involves the copyright and/or other issues, please contact us and we will deal with it asap! CERADIR™ has the interpretation of this declaration.
