Abstract
Relative sliding or bumping of structural elements during the operation of a very high-temperature gas-cooled reactor (VHTR), which has been developed by the Japan Atomic Energy Research Institute, are to be caused supposedly by thermal expansion, flow-induced vibration, seismic forces etc. Appropriate measures, therefore, must be taken in order to prevent abnormal wear, seizing or failure of these structural elements.The friction and wear characteristics of Ni-based heat-resisting alloy (Hastelloy X-R), which is now thought to be one of the promising candidate materials for VHTR structures, and several ceramic materials by which the surfaces of Hastelloy X-R are to be coated, were studied in 1, 000°C and 0.2-4.1MPa He gas environment.The followings are the conclusions derived from the present experiment:(1) The friction coefficient of Hastelloy X-R against itself decreased with increasing O2 gas partial pressure within 3kPa in the He gas environment.(2) The mutual transfer of material elements occurred when the material combination was Hastelloy X-R against ZrO2 coating.(3) The friction and wear characteristics of ZrO2 and TiC coatings against themselves were stable.
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