Papers by Author: Jon Binner

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Authors: Bala Vaidhyanathan, Jon Binner
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Authors: Jon Binner, S. Hughes, R.M. Sambrook
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Authors: Y. Liang, N. Gregory, Jon Binner
2319
Authors: Jon Binner, A.M. McDermott, Y. Yin
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Authors: R.L. Higginson, H. Chang, Jon Binner
Abstract: Interpenetrating composites allow a completely 3-dimensional matrix of two phases, in this case an alumina (ceramic) and aluminium-magnesium alloy (metal), to be developed. This 3-dimensionality yields a material with mechanical and physical properties that are superior to either the metal or ceramic individually. The composites were produced by heating an alumina foam and aluminium-magnesium alloys together in flowing nitrogen to in excess of 900°C. At these temperatures the alloy is drawn into the ceramic foam by capillary action. The infiltration process is dependent on the interaction of the alloy with the nitrogen atmosphere in the furnaces. This complex interaction and its affect on the microstructural development has been studied using Electron Backscatter Diffraction (EBSD) coupled with Energy Dispersive x-ray Spectroscopy (EDS).
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Authors: Jon Binner, Bala Vaidhyanathan, Tony Carney
Abstract: Radiant and hybrid sintering experiments have been performed on dry and wet processed nanocrystalline 3-YSZ using both a conventional single stage and a new two stage sintering cycle. Whilst densities >98.5% of theoretical were achievable by all combinations, a nanostructure could only be retained using the two stage sintering approach. With hybrid heating the average grain sizes for die pressed samples were in the range 70 – 80 nm whilst for the more homogeneous slip cast samples a final average grain size of just 64 nm was achieved for a body with a final density of >99%. It is believed that the primary advantage offered by hybrid heating is the ability to use a much faster initial heating rate, 20 versus just 7oC min-1, without risking damage to the samples. Whilst detailed characterisation of the properties of these nanostructured ceramics is still underway, preliminary results have suggested that neither the hardness or toughness has been improved compared to conventional, submicron-sized 3-YSZ. As a result of detailed crystallographic characterisation this is believed to be due to a grain size dependent shift in the phase boundary composition for nano YSZ ceramics leading to ‘over stabilisation’ at any given yttria content.
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Authors: Jon Binner, Bala Vaidhyanathan
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Authors: Jon Binner, Ketharam Annapoorani, Bala Vaidhyanathan
Abstract: The processing of nanocrystalline yttria doped zirconia powder via dry forming routes has been investigated via the granulation of the powder using spray freeze drying (SFD). Free-flowing and crushable powders suitable for either die or isosatic pressing have been achieved via the combination of SFD with additions of up to 2 vol% of Freon 11; the latter reducing the strength of the granules whilst not affecting the powder flowability into the die. The approach has allowed relic-free green bodies of up to 55% of theoretical density to be produced using pressures as low as 250 MPa.
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Authors: Jon Binner, Bala Vaidhyanathan
Abstract: This paper attempts to shed light on why the stand alone microwave processing of technical ceramics, despite being one of the most popular field with respect to volume of research performed, is still struggling to achieve priority status with respect to commercialisation. To obtain some answers to this enigma and determine when microwaves should be used to process technical ceramics, three case studies are explored. The conclusion is that microwaves should be used to process technical ceramics when specific advantage can be taken of the intrinsic nature of microwave energy and not simply as an alternative energy source. In addition, it is concluded that from a commercialisation view point hybrid processing is often a better approach than the use of pure microwaves.
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