Dilatometry
Dilatometry allows dimension changes in a specimen to be read as a function of temperature. The temperature in range:( 20-1300 °C) and Working atmosphere: Argon or vacuum. The high level of accuracy exhibited by the temperature control and the sensitive length measuring device allow not only the determination of thermal expansion but also the thermal expansion coefficients, density changes, decomposition, sintering, phase transition and glass transition temperature of a material. When carrying out the measurement, the specimens are positioned in a protective tube and heated in shielding gas or a vacuum atmosphere respectively. However, the actual specimen temperature is measured with a thermoelement. A quartz rod on an inductive displacement sensor relays information on the length change of the specimen. The data thus won are absolutely essential for the analysis of thermally induced tensions in join compounds. Especially during the cooling phase of a soldering process when joining hybrid microsystems, varying expansion coefficients must be taken into consideration.
where L1 is the length at T1 and the length L2 atT2and is the coefficient of linear expansion(?). Over a small temperature interval ?T is approximately constant for many materials, so the dilation:
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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