The Status of Understanding Diffusion Controlled Solid State Sintering, Hot Pressing and Creep
Since Kuczynski’s pioneering work on the development of models to predict neck growth rates in sintering by diffusion, and his experimental efforts to test their applicability, there have been numerous authors who have contributed a plethora of models covering the different stages of the process with varying assumptions regarding the geometries, the diffusion fields, and the different atomic transport paths which contribute to the overall behavior (1–5). Ashby’s recent paper is a useful source to the past modelling work on single phase materials (6). The selection of the models cited there was based on simplicity and reasonable accuracy; both the initial and later stages of the process are covered there, although the importance of grain growth and atmosphere effects are not considered. (7,8). Experimental data on different materials, initial particle sizes, dopants, and temperature schedules have provided a relatively convincing view that for most of the range of variables, the sintering process is diffusion controlled.
KeywordsCreep Rate Boundary Diffusion Lattice Diffusion Dopant Effect Diffusional Creep
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