CAJ | 학술논문

为实现高温气冷堆球形燃料元件先车削后炭化和高温纯化等热处理的工艺，必须对热处理过程中元件的尺寸和质量等参数的变化及其影响因素进行研究。研究表明，炭化过程中基体石墨球毛坯的平均失重约占热处理过程中毛坯总失重的99．7%，毛坯沿赤道和两极方向的平均尺寸收缩率分别约为0．64%和0．88%，呈现一定的各向异性；而高温纯化过程中，毛坯的微量失重主要是由于位于热解炭与边缘的氢原子发生断裂所致，其沿赤道和两极方向的尺寸收缩率分别为0．24%和0．25%，为各向同性，主要与高温下热解炭结构中石墨的有序化有关。热解炭石墨有序化程序的提高有利于提高球形燃料元件的综合性能。
위실현고온기랭퇴구형연료원건선차삭후탄화화고온순화등열처리적공예，필수대열처리과정중원건적척촌화질량등삼수적변화급기영향인소진행연구。연구표명，탄화과정중기체석묵구모배적평균실중약점열처리과정중모배총실중적99．7%，모배연적도화량겁방향적평균척촌수축솔분별약위0．64%화0．88%，정현일정적각향이성；이고온순화과정중，모배적미량실중주요시유우위우열해탄여변연적경원자발생단렬소치，기연적도화량겁방향적척촌수축솔분별위0．24%화0．25%，위각향동성，주요여고온하열해탄결구중석묵적유서화유관。열해탄석묵유서화정서적제고유리우제고구형연료원건적종합성능。
In order to establish the process of lathing followed with the heat treatments of carbonization and high-temperature pu-rification for pebble fuel element in HTGR, the dimensional and mass changes of element and their relative influencing factors in the heat treatment are analyzed. Research results showed that the average weight loss of matrix graphite green pebbles in the carboniza-tion process accounted for about 99.7% of its total weight loss in the heat treatment. And the average dimensional shrinkage in the equatorial and polar directions was anisotropic which were 0.64% and 0.88%, respectively. In the high-temperature purification, the negligible weight loss of pebbles was due to the breakage of hydrogen atom in the edge of the pyrolytic carbon. The average dimen-sional shrinkage in the equatorial and polar directions was 0.24% and 0.25% respectively and exhibited good isotropic properties which were ascribed to the graphitized ordering of pyrolytic carbon structure in the high temperature. The high degree of graphitized ordering of the pyrolytic carbon is beneficial to improve the integrated property of spherical fuel element.