Synthesis of yttria nanopowder with poly acrylic acid as dispersant for highly transparent yttria ceramics

Abstract

Highly pure and well-dispersed yttria nanocrystalline powders were synthesized with a modified coprecipitation method that uses mixed ammonium hydroxidecarbonate solution as the precipitant and poly acrylic acid (PAA) as the dispersant. Comparing with the yttria powders synthesized using the same route but without PAA dispersant, the PAA-assisted powders exhibit lower level of agglomeration and better sinterability. Sintering trajectories of the powders with and without PAA dispersant were investigated. Y 2 O 3 ceramics sintered with the PAAassisted powders exhibited smaller grain size, homogeneous microstructure, and higher in-line optical transmittance. The result suggests that the polymerassisted coprecipitation could be used to synthesize yttria nanopowders for fabricating high optical quality transparent ceramics.

New Strategy for Preparation of Yttria Powders with Atypical Morphologies and Their Sintering Behavior

“…Due to its high-temperature strength and high corrosion resistance, yttria (Y 2 O 3 ) is widely used in the preparation of various high-grade materials [ 1 , 2 , 3 ], such as transparent ceramics for laser crystals and crucibles for titanium alloy melting [ 4 , 5 ].To achieve excellent properties, high-density yttria materials are typically prepared through sintering or electric melting [ 6 , 7 ]. In the sintering process, the main factors affecting the densification of yttria are the raw material properties as well as the sintering process and methods [ 8 , 9 ].…”

Adsorption Characteristics and Electrochemical Behaviors of Methyl Blue onto Magnetic MgxCoyZn(1-x-y)Fe2O4 Nanoparticles

“…Many approaches can be applied for the preparations of magnetic nanomaterials, such as coprecipitation [32, 33], sol-gel [34], rapid combustion [35], and hydrothermal methods [36]. The coprecipitation method is easy to cause a high local concentration of solution owing to precipitant, leading to agglomeration [37]; and the sol-gel method has the disadvantages of a long preparation cycle and high cost [38], while the hydrothermal method has high requirements on the reaction temperature and pressure and has great safety risks [38]. Compared to these methods, the rapid combustion method has advantages such as low cost, a short preparation period, low equipment requirements, and other advantages.…”

Fabrication of er-doped sesquioxide laser ceramics and their laser performance

“…With the boom of laser industry, solid-state lasers have made great contributions to various aspects of our society, such as industrial material processing, medical surgery, light resources in automatic driving system as well as environmental monitoring. [1][2] Besides, they have shown a great potential for future nuclear-fusion applications. [3][4] Since the invention of continuous-wave (CW) lasers in 1960, [5][6] worldwide attention has been focused on developing high quality laser gain media which was primarily based on single crystals.…”

“…Although previously powders synthesized with different methods have been used to produce highly transparent sesquioxide ceramics, 55,[57][58][59] it is now well accepted that the nanosized powders synthesized with the chemical coprecipitation methods are an excellent candidate for the laser ceramics. [126][127][128] For the fabrication of transparent ceramics with high optical quality, the vacuum sintering technique is normally used. The pores in ceramic green bodies usually contain vapor, carbon dioxide, nitrogen etc.…”