Kukuvadzwa nemwaranzi yegrafiti powder kune simba guru pakushanda kwehunyanzvi uye kwehupfumi kwereactor, kunyanya pebble bed inotonhorerwa negasi zvakanyanya. Maitiro ekugadzirisa neutron kupararira kwe elastic kweneutrons nemaatomu echinhu chinodzora, uye simba rinotakurwa naro rinoendeswa kumaatomu echinhu chinodzora. Graphite powder imhando yakanaka yezvigadzirwa zvinotarisa plasma zvenuclear fusion reactors. Vanyori vanotevera veFu Ruite vanosuma kushandiswa kwegrafiti powder mukuyedzwa kwenyukireya:
Nekuwedzera kwe neutron fluence, graphite powder inotanga kudzikira, uye mushure mekusvika padanho diki, shrinkage inoderera, inodzokera kuhukuru hwepakutanga, uye yobva yawedzera nekukurumidza. Kuti tishandise nemautron zvinobudirira anoburitswa ne fission, anofanira kudzikiswa. Hunhu hwekupisa hwe graphite powder hunowanikwa ne irradiation test, uye mamiriro e irradiation test anofanira kunge akafanana nemamiriro chaiwo ekushanda kwe reactor. Chimwe chiyero chekuvandudza kushandiswa kwe neutrons ndechekushandisa reflective materials kuratidza ma neutrons anobuda kubva mu nuclear fission reaction zone-core back. Maitiro e neutron reflection zvakare elastic scattering ye neutrons nemaatomu e reflective materials. Kuti udzore kurasikirwa kunokonzerwa nekusvibiswa kusvika pamwero unobvumidzwa, graphite powder inoshandiswa mu reactor inofanira kunge yakachena.
Upfu hwegirafiti yenyukireya ibazi rezvinhu zveupfu hwegirafiti zvakagadzirwa zvichienderana nezvinodiwa zvekuvaka ma reactor enuclear fission mukutanga kwema1940. Inoshandiswa semoderator, reflection uye structural materials mu production reactors, gas-cooled reactors uye high-temperature gas-cooled reactors. Mikana yekuti neutron iite nucleus inonzi cross section, uye thermal neutron (average energy ye 0.025eV) fission cross section ye U-235 yakakwirira kaviri pane fission neutron (average energy ye 2eV) fission cross section. Elastic modulus, strength uye linear expansion coefficient ye graphite powder inowedzera nekuwedzera kwe neutron fluence, inosvika kukosha kukuru, uye yobva yadzikira nekukurumidza. Mukutanga kwema1940, graphite powder chete ndiyo yaiwanikwa pamutengo unokwanisika pedyo nekuchena uku, ndosaka reactor yega yega uye ma production reactors akatevera aishandisa graphite powder sechinhu chinodzora, zvichiunza nguva yenyukireya.
Chinhu chikuru pakugadzira upfu hwegrafiti yeisotropic ndechekushandisa zvikamu zvecoke zvine isotropy yakanaka: isotropic coke kana macro-isotropic secondary coke yakagadzirwa kubva ku anisotropic coke, uye tekinoroji yecoke yechipiri ndiyo inoshandiswa pari zvino. Hukuru hwekukuvadzwa kwemwaranzi hunoenderana nezvinhu zvakagadzirwa negrafiti powder, maitiro ekugadzira, kukurumidza kwe neutron fluence uye fluence rate, tembiricha yemwaranzi nezvimwe zvinhu. Boron yakaenzana nenuclear graphite powder inofanirwa kunge iri pa10~6.
Nguva yekutumira: Chivabvu-18-2022