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燃料集合体パッド部材の選定試験(I)高温ナトリウム中における摩擦係数

Screening test for duct pad materials of fuel assembly (I); Frictional coefficient in a sodium environment

溝淵 庄太郎*; 富永 康夫*; 小圷 亨; 厚母 栄夫

Mizobuchi, Shotaro*; not registered; Koakutsu, Toru; Atsumo, Hideo

従来から,高速炉内の接触,摺動部材の選定試験を行っているが今回,6種類の燃料集合体パッド部候補材について,摸擬した条件で試験を行った。これによって,以下の事がわかった。▲1)SUS316材は摩擦係数が高く(0.8),悪い摩擦挙動を示した。又,硬質クロム・メッキ材も摩擦挙動が悪く,540$$^{circ}C$$ナトリウム試験後,硬度の低下が大きかった。▲2)クロム・カーバイト材は表面状態の粗い「B.F」仕上げのものか研磨した「G.F」より,安定な摩擦挙動を示し,摩擦係数値は0.5前後であった。又温度によって,この値は変化しなかった。▲3)コルモノイN-6は,今回試験した材料のうち最も低い摩擦係数値を示した(0.34)。又ステライトN-6材は280$$^{circ}C$$ナトリウム中でも,やや悪い摩擦挙動を示した。▲4)540$$^{circ}C$$のナトリゥム中で一定時間,加圧して保持した場合,すべての材料で摩擦係数の増加が認められた。▲これらの事から,この試験条件内では,コルモノイN-6とクロム・カーバイト材の田.F」のものがパッば部材として有望である事がわかった。▲

We have been conducted experiments to select for the contacting and sliding material use in F.B.R.. In present study, we tested in simulated condition for 6 kind of the candidated materials as duct pad of fuel assembly. The following results were obtained, (1)SUS316 showed a bad frictional behivor as the high frictional coefficient of 0.8, and hard chrome plating, also, have been unstable frictional behavior and become to the lower hardness after tested in 540$$^{circ}$$C sodium. (2)The brush-finished chrome carbide showed the more stable frictional behaivor than the grinder-finished material, and frictional coefficient showed approximately 0.5. This coefficient was independent on the temperature in this test. (3)Colmonoy No.6 indicated the lowest frictional coefficient of 0.34 in materials of present studys. But, stellite No.6 showed a little unstable friction behavior even if tested in 280$$^{circ}$$C sodium. (4)Each of tested materials were observed increasing frictional coefficient, after tested dwelling in 540$$^{circ}$$C sodium. It was recognized that colmonoy No.6 and the brush-finished chrome carbide seem to be the promising as duct pad materials.

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