2/12/2023 0 Comments Jondo youtube![]() It was because the diffusion and conduction path through the grain boundary and the inner surface of the pores with high defect concentration are blocked with an increase of density or grain size. When the density and grain size of the sample were higher and larger, the flash onset temperature was higher. ![]() Flash was also observed in samples which were presintered, having a density of 86–100% and a grain size of 0.2–0.9 μm. The smaller the thickness of the sample, the higher the flash onset temperature due to the larger specific surface area. In a vacuum atmosphere, a flash occurred at a lower temperature by 50–100 ☌ than in air. In this study, the effect of processing conditions such as sintering atmosphere, sample size, density and grain size on the flash onset of hydroxyapatite was investigated. ![]() In what condition flash does occur is a main issue for the flash sintering technique. When heat and electric field are applied to the sample, sintering takes place within a short time of a few seconds by the flash phenomenon that occurs.
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