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최태현 ( Tae-hyun Choi ),황규업 ( Gyu-eob Hwang ) 한국고등직업교육학회 2000 한국고등직업교육학회논문집 Vol.1 No.4
Far infrared radiation of Jade used in sauna system system was studied. To study far infrared radiation properties of Jade, composition of Jade was analyzed, and X-ray diffraction(XRD), thermal analysis(DTA/TG), scanning electron micro scope(SEM), thermography were used. Chemical composition of starting materials was mainly composed of SiO2(40.10%) and MgO(37.1%). The chemical structure was antigorite(3MgO · 2SiO2 · 2H2O) by X-ray diffraction. The weight loss of Jade was 12.45% by thermal analysis at the temperature range of 25°C~1,450℃. SiO2 was transformed to β-tridymite from β-quartz by temperature increase. The effect of far infrared radiation was observed by photo thermography. We found that the far infrared radiation energy (W/m<sup>2</sup> · ㎛ · °C) was 3.74×102 and radiation rate (5~20㎛) of Jade was 0.93.