Speaker
Description
A novel cold assisted sintering process using a combination of functionalised boehmite and −alumina particles is demonstrated. Functionalised boehmite and -alumina composites were initially densified using a cold sintering process at <300 C followed by heat-treatment at 1400-1450 oC (~200-300 C lower than conventionally sintered -alumina). Highest relative densities (98%) were achieved using meso-scale -alumina (d50 = 720 nm) in a 50:50 wt% mixture with boehmite, functionalised in 2M acetic acid. The high densities at low temperature were attributed to easy propagation of the transformation to phase within the dense boehmite matrix, accompanied by enhanced nucleation on the surface of the alumina particles. Critical aspects of the transformation sequence from functionalised boehmite to alumina were characterised using Raman and Fourier Transform InfraRed spectroscopy. Preliminary hardness measurement were comparable with conventional alumina sintered at ~1650 C.
| Interest in submitting a paper in a special issue of | No interest |
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