Cov hluav taws xob puas tsuaj ntawm graphite hmoov muaj kev txiav txim siab ntawm kev ua haujlwm thiab kev lag luam ntawm lub reactor, tshwj xeeb tshaj yog pebble txaj kub kub-txias reactor. Lub mechanism ntawm neutron moderation yog elastic tawg ntawm neutrons thiab cov atoms ntawm cov khoom siv moderating, thiab lub zog nqa los ntawm lawv yog pauv mus rau cov atoms ntawm cov khoom siv moderating. Graphite hmoov kuj yog ib tus neeg sib tw zoo rau cov ntaub ntawv plasma-oriented rau nuclear fusion reactors. Cov nram qab no kho los ntawm Fu Ruite qhia txog daim ntawv thov ntawm graphite hmoov hauv kev sim nuclear:
Nrog rau qhov nce ntawm neutron fluence, graphite hmoov ua ntej shrinks, thiab tom qab ncav cuag tus nqi me me, lub shrinkage txo qis, rov qab mus rau qhov qub, thiab tom qab ntawd nthuav dav. Txhawm rau kom siv cov neutrons tso tawm los ntawm fission zoo, lawv yuav tsum tau qeeb. Lub thermal zog ntawm graphite hmoov yog tau los ntawm irradiation xeem, thiab irradiation xeem tej yam kev mob yuav tsum zoo ib yam li cov kev ua hauj lwm ntawm lub reactor. Lwm qhov kev ntsuas txhawm rau txhim kho kev siv cov neutrons yog siv cov khoom siv cuam tshuam los cuam tshuam cov neutrons tawm ntawm cov tshuaj tiv thaiv nuclear fission tsam-core rov qab. Lub tshuab ntawm neutron reflection kuj yog qhov elastic tawg ntawm neutrons thiab atoms ntawm cov khoom siv reflective. Yuav kom tswj tau qhov poob los ntawm impurities mus rau theem tso cai, graphite hmoov siv nyob rau hauv lub reactor yuav tsum yog nuclear ntshiab.
Nuclear graphite hmoov yog ib ceg ntawm graphite hmoov cov ntaub ntawv tsim los teb rau cov kev xav tau ntawm lub tsev nuclear fission reactors nyob rau hauv thaum ntxov 1940s. Nws yog siv los ua tus neeg saib xyuas, kev xav thiab cov khoom siv hauv cov reactors ntau lawm, roj-txias reactors thiab high-temperature gas-cooled reactors. Qhov tshwm sim ntawm cov neutron reacting nrog lub nucleus yog hu ua ntu ntoo khaub lig, thiab thermal neutron (nruab nrab lub zog ntawm 0.025eV) fission hla ntu ntawm U-235 yog ob qib siab tshaj qhov fission neutron (nruab nrab lub zog ntawm 2eV) fission hla ntu . Lub elastic modulus, lub zog thiab linear expansion coefficient ntawm graphite hmoov nce nrog qhov nce ntawm neutron fluence, ncav cuag tus nqi loj, thiab tom qab ntawd txo qis. Thaum xyoo 1940, tsuas yog graphite hmoov muaj nyob rau ntawm tus nqi pheej yig ze rau qhov purity no, uas yog vim li cas txhua lub reactor thiab tom qab cov reactors siv graphite hmoov los ua cov khoom nruab nrab, ushering nyob rau hauv lub hnub nyoog nuclear.
Tus yuam sij rau kev ua isotropic graphite hmoov yog siv coke hais nrog zoo isotropy: isotropic coke los yog macro-isotropic theem nrab coke ua los ntawm anisotropic coke, thiab theem nrab coke technology feem ntau yog siv tam sim no. Qhov loj ntawm cov hluav taws xob puas muaj feem xyuam rau cov khoom siv raw ntawm graphite hmoov, kev tsim khoom, ceev neutron fluence thiab fluence tus nqi, irradiation kub thiab lwm yam. Qhov sib npaug ntawm cov boron graphite hmoov yuav tsum nyob ib ncig ntawm 10 ~ 6.
Post lub sij hawm: May-18-2022