断熱材の簡便な熱伝導率測定技術の開発

抄録

Recently, the practical use of high performance insulation materials such as nanoparticles insulation material or the vacuum insulation material has been spreading to various kinds of industrial fields including industrial furnaces, buildings, home electric appliances, thermal or cold insulation boxes. However, it is very difficult to measure the thermal conductivity. Because uniform temperature gradient for applying Fourier’s low must be achieved in the test specimen. To solve this issue, we have proposed a new method to measure the thermal conductivity of specimens which includes ununiformed temperature gradient areas, and have developed an apparatus with simple structure. In this paper, we have applied this method for the measurement until 400°C. As the result, the thermal conductivity of the ceramics fiber insulation, the calcium silicate, and the nanoparticle material insulations agreed within ±10% for the previous studies in the temperature range from 100°C to 400°C. The uncertainty of the measured values also made clear this method is reliable.