Development of a high temperature equipment using infrared ray

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In order to investigate the formation process of the planetary materials, it is important to observe the structural changes and the phase transitions of mierals at high temperature. However, the adequate high temperature equipments for the tempearture range of 1000 - 1400 oC have not been developed, especially for temperature stability, long life-time, least contamination and circumstance control. In this reasearch, the new heating device was developed for the conditions avobe mentioned. The furnace is the oval-formed infra-red furnace, where a halogen lamp is situated on one of the forcuses and inside of the fornace is coated by gold. In the other focus a silica-glass rod whose surface was polished is set. The 80% of infra-red ray which was ejected from the lamp is concentrated on the surface of the glass rod. The infra-red ray concentrated on the rod is introduced in the rod and proceeded in the rod to the specimen position with total reflection. In order to attain much higher temperature, the infra-red ray must be focued on the specimen. When the lens system is adopted for forcusing, it is difficult to avoid chromatic aberration. Therefore, the reflection cone system was introduced where the infra-red ray is concentrated by total reflection. The adequate materials for the focusing cone must have high transparency and high reflactive index to infra-red ray. On this point of view, SiO2 glass and saphire were selected. Because of manufacturing difficulty and high cost, saphire was applied only to the reflection cone. The temperature was calibrated by the melting points of several materials. The highest temperature was attained to be 1400oC by using a SiO2 glass rod whose end had been manufactured to the cone (20 degree of conical angle). We introduced further a Pt-coating to the cone area to avoid the leak of ray. The homogeneous temperature was attained in the area of 5mm PHI.We applied this high temperature equipment to the X-ray precession camera and the high te