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在堆用不锈钢包壳管内分别填装不同B/C比的B4C芯块及核级钠 ,以模拟快堆控制棒内的B4C/Na/S .S .三元体系 ,在堆外 5 5 0、65 0和 75 0℃下相互作用 82d。试验后的B4C芯块外观完整 ,未见掉角、龟裂或破碎 ;表面变得粗糙 ,失去原有的金属光泽 ,化学反应产物NaB5 O8等在表面沉积和粘附 ,并导致B4C芯块体积增大 ;芯块的微观结构和晶粒度试验前后无明显变化。包壳管内表面渗B、渗Na和渗C ,渗B和渗Na量均随温度升高和B/C比增大而增加 ,渗C则反之。Na和Na中杂质以及B4C与包壳间的化学反应产物为NaBO2 、Cr2 B、Fe2 B和Ni3 B。B化物的形成使包壳管内表面显微硬度显著增大。
In the reactor, the B4C pellets with different B / C ratios and the nuclear grade sodium were packed in the stainless steel cladding tube respectively to simulate the B4C / Na / S .S ternary system in the reactor of the fast reactor. , 65 0 and 75 ° C for 82d. After the test, the appearance of B4C pellet is intact with no corner, cracked or broken; the surface becomes rough, the original metallic luster is lost, the chemical reaction product NaB5 O8 is deposited and adhered on the surface, and the volume of B4C pellet Increase; the microstructure and grain size of the pellet before and after the test no significant change. Permeability B, infiltration Na and infiltration C, infiltration B and infiltration Na content increased with the increase of temperature and B / C ratio, infiltration C was the contrary. The Na and Na impurities and the chemical reaction products between B4C and the cladding are NaBO2, Cr2B, Fe2B and Ni3B. The formation of B compound significantly increases the microhardness of the inner surface of the cladding tube.