高レベル放射性廃棄物(模擬)含有ガラス―銅混合物の連続加圧焼結

抄録

Glass-copper composite compacts were studied concerning solidification of radioactive wastes. The powder mixtures of the glass, which was a borosilicate glass containing about 27wt% high-level radioactive wastes (simulated) offered by PNC, and electrolyzed, fine copper powder were subjected to pressure sintering.
At first, sintering behavior of the mixtures and thermal properties of the compacts were investigated. The mixtures sintered almost to full densities at the temperatures above the yield point of the glass, when the copper content was not so much. The thermal conductivity of the compact containing 30wt% copper was about 4.5 times higher than that of original glass.
In order to obtain long size composite compacts, a continuous pressure sintering apparatus was built as trial. Using the mixture containing 30wt% copper powder. the compacts of the diameter of 5 cm and of the length exceeding 30 cm were successfully prepared at the sintering conditions of 560°C and 150 kg/cm₂.