Thesis-2014-Zhang-Yifei.pdf (11.55 MB)

Spray freeze drying of nanozirconia powders

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thesis
posted on 21.11.2014, 14:08 by Yifei Zhang
Nanozirconia ceramics have great potential to be used in a range of applications from dental implants to petrochemical valves due to their enhanced mechanical properties and superior hydrothermal ageing resistance. Unlike conventional ceramic components that are normally produced in large quantities with low costs using various conventional dry forming or wet forming methods, industry scale processing of nanoceramics has not yet been achieved. Concentration and granulation of nanostructured 3 mol% yttria stabilised zirconia via a spray freeze drying (SFD) technique was investigated to determine whether large scale dry forming of nanoceramics would be possible. Commercial nanosuspension with a primary particle size of 16 nm was concentrated to 55 wt% solids content using an electrosteric dispersant, β-alanine, whilst retaining low viscosities of ~20 mPa s at a 200 s-1 shear rate. The nanosuspensions concentrated using the β-alanine also displayed good ageing resistance and it has been proven that a large scale vacuum assisted rotary evaporator can be used to perform concentration in industry. [Continues.]

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Publisher

© Yifei Zhang

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2014

Notes

A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.

Language

en

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