Effect of composition on the sintering shrinkage of two-phase systems
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In the sintering of powders of metals which exhibit unlimited intersolubility and have a single-phase solid solution structure at the sintering temperature, a correlation is found between the concentration dependence of shrinkage and the variation of diffusion parameters (diffusion coefficients or energy of activation for diffusion). As the energy of activation for diffusion increases, the shrinkage decreases, and vice versa.
In the sintering of powders of metals showing a limited intersolubility, the concentration dependence of shrinkage is determined by the properties of the phases forming during sintering in accordance with the constitution diagram of the metals involved in the process. With rise in the amount of the less deformable phase, the shrinkage decreases; conversely, as the amount of the more deformable phase is raised, the shrinkage increases. It would appear that here, as in the sintering of systems showing unlimited intersolubility, the variation of shrinkage with concentration is determined by the concentration dependence of the diffusion processes taking place in the system.
KeywordsSolid Solution Shrinkage Diffusion Coefficient Diffusion Process Sinter Temperature
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