Calibration of High Temperature Profile in a Home-Assembled Quartz Tube Furnace

Pang, Carmen (2020) Calibration of High Temperature Profile in a Home-Assembled Quartz Tube Furnace. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

In this project, a customized small quartz tube furnace was designed. The main feature of the tube furnace is its small diameter tube (23mm) which is suitable for small sample (within the sample volume of 1 cm3) for heat treatment or annealing. The power consumption is limited to below 1 kW. The temperature profiles have been investigated to ensure a reliable temperature dependent. Two K-type thermocouples were utilised to calibrate the temperature profiles for cooling and heating profiles. A few repeated runs of the profile for cooling and heating processes show similar offset behaviours indicating that as long as the user is able to maintain consistent settings for both heating and cooling processes, a similar calibration can be used consistently. The spatial temperature dependence was investigated for heat uniformity across the tube limited to within 5 cm from the center of the tube. The spatial temperature profiles indicate that the spatial constant temperature range is rather limited to less than 2.1 cm from the peak of the temperature region inside the tube for a 5°C deviation. Such uniformity of tube furnace is considered sufficient usable for small sample.