1.8 Sintering Diagrams
Differences in bulk capillary pressure, bulk vacancy concentration and vapor pressure appear simultaneously and independently according to a difference in the surface curvature of particles in contact. Therefore, simultaneous and independent material transport caused by these differences occurs during sintering. However, there is a dominant mechanism that depends on the system concerned, sintering conditions, degree of sintering, etc.
Ashby developed a sintering diagram based on various sintering mechanisms. Under the assumption of no grain growth, the Ashby sintering diagram identifies the dominant sintering mechanism under various experimental conditions and shows the rate of sintering those results from all the mechanisms acting together.In the Ashby sintering diagram, sintering is divided into three stages: stage 0 where adhesion between particles occurs at the very beginning of sintering, stage 1 where the driving force for sintering decreases as the neck grows, and stages 2 and 3 where the driving force increases with neck growth (spherical pore stage).
1.9 Effect of Sintering Variables on Sintering Kinetics
In general, the sintering rate (densification rate) increases with decreased particle size and with increased sintering temperature and time
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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