New Development in Determination of Metal Volume Thermal Expansion Measurement Using Hydrostatic Weighing System (HWS)

Abstract

Volume thermal expansion measurement of solidmaterialis one of the most challenging issue in material industryespecially when the size of the sample is large.The existing instruments such as dilatometer has a limitation to determine the volume thermal expansiondue to various of samples sizes and shapes. In this study, a new and precise hydrostatic weighing system (HWS) has been proposed to fulfil various samples shapes and sizes in the volume thermal expansion determination. The performance of the developed HWS was tested and evaluated using several samples such as gold and tungsten. The volume thermal expansionof goldand tungsten rod measured using the HWS are 1.5×10-4 °C-1and 7.7×10-5 °C-1respectively with expanded uncertainty of0.0003 °C-1. The results of the HWS measurement was verified and compared with dilatometer. The comparison results show En≤ 1 indicated that the performance of the HWS is acceptable. Furthermore, it is cheaper than dilatometer with reasonable accuracy and traceable to SI unit