Kev xaiv cov khoom siv - Qhov txawv ntawm kev ua tiav thiab kev puas tsuaj loj ntawm -90 degree
Kev xaiv cov khoom siv txiav txim siab muaj sia nyob hauv cov cheeb tsam cryogenic ntau dua li qhov ntsuas wattage qhia. Qhov no yog ib zaj lus qhia uas tau kawm ntau zaus hauv kev khaws tshuaj, kev sim aerospace, thiab kev ua lag luam tshwj xeeb uas qhov kub txog -90℃thiab qis dua.
Xav txog qhov ductile - mus rau - qhov kub thiab txias hloov pauv - lub ntsiab lus ntawm cov khoom hloov pauv hloov pauv mus rau qhov tsis yooj yim. Ntau cov alloys sib txawv hla qhov chaw pib no qhov tseeb nyob rau hauv qhov kub thiab txias qhov twg cryogenic cartridge heaters yuav tsum ua haujlwm. Standard stainless hlau 304, thaum zoo kawg nkaus txaus rau kev lag luam cua sov, ua nkig zuj zus thaum kub poob qis dua -30 degree. Ntawm -90 degree, nws cov khoom siv kho tshuab degrade loj, ua rau nws muaj kev cuam tshuam rau kev tawg nyob rau hauv lub thermal stress ntawm lub zog cycling.
Stainless hlau 316L muaj kev txhim kho kev ua tau zoo los ntawm nws cov ntsiab lus qis dua thiab txhim kho nickel muaj pes tsawg leeg. Nws tuav zoo dua toughness thiab tsis kam rau thermal shock cycling ntawm huab cua txias thiab kev khiav hauj lwm kub. Rau cov ntawv thov uas xav tau tshaj plaws, Inconel 600 lossis 625 alloys muab tshwj xeeb rau kev tiv thaiv thermal qaug zog, tswj xyuas kev ntseeg siab thoob plaws qhov kub thiab txias uas yuav ua rau cov qauv stainless hlau ua tsis tiav. Cov npib tsib xee -chromium alloys tiv thaiv cov embrittlement uas ua rau rov ua dua thermal cycling kom tawg cov pa pa.
Cov hlau tsis kam nws tus kheej xav tau kev sib npaug. Nickel-chromium alloys zoo li NiCr 80/20 yuav tsum ua kom pom cov khoom hluav taws xob ruaj khov thoob plaws tag nrho qhov kub thiab txias-los ntawm cov txheej txheem pib cryogenic mus rau qhov kub thiab txias uas yuav ncav cuag ntau pua degrees Celsius. Ntawm -90 degree, qhov kev hloov pauv hloov. Cov txheej txheem nickel-chromium alloys tuaj yeem ua rau pom kev tiv thaiv poob ntawm 10 mus rau 15 feem pua ntawm qhov kub thiab txias piv nrog rau qhov chaw nyob, lub ntsiab lus ntau dua tam sim no tau kos thiab ntau lub zog tsim tawm rau qhov muab hluav taws xob ntau dua li cov lus qhia tshwj xeeb. Qhov tshwm sim no yuav tsum suav nrog hauv kev suav lub zog thiab kev tswj hwm kev tsim qauv.
Lub rwb thaiv tsev magnesium oxide uas ua rau lub tshuab cua sov ua rau lwm qhov kev sib tw. High-purity magnesium oxide yog qhov zoo heev rau kev sib cais hluav taws xob thiab thermal conduction, tab sis nws nthuav tawm hygroscopic nyiam uas ua rau muaj kev phom sij hauv qhov chaw khov. Cov dej noo nyob rau hauv lub rhaub dej thaum lub sij hawm tsim khoom lossis nkag los ntawm cov ntsaws ruaj ruaj tsis zoo tuaj yeem khov thiab nthuav dav ntawm qhov kub thiab txias. Lub ntim nthuav dav ntawm kwv yees li 9 feem pua thaum dej tig mus rau cov dej khov ua kom muaj zog txaus kom tawg cov rwb thaiv tsev los yog rub lub plhaub tawm ntawm qhov kawg seals.
Cov tuam txhab lag luam hwm hais txog qhov no los ntawm lub tshuab nqus tsev- cov txheej txheem sau cov txheej txheem uas tshem tawm cov voids, ua raws li kev sib khi hermetic siv cov ceramic- mus rau - cov ntsaws ruaj ruaj hlau lossis cov khoom tshwj xeeb epoxy rated rau cov kev pabcuam cryogenic. Tom qab-kev tsim khoom ci- tawm cov txheej txheem ntawm 120 mus rau 150 degrees Celsius kom ntseeg tau tias cov dej seem seem raug tsav tawm ua ntej xa khoom.
Thaum qhia txog lub tshuab cua sov rau -90℃ib puag ncig, kev xaiv cov khoom siv yuav tsum txuas ntxiv tshaj li cov ntaub qhwv kom suav nrog txhua cov khoom tiv thaiv-tiv thaiv hlau, rwb thaiv tsev, cov ntsaws ruaj ruaj, thiab cov hlau lead hlau rwb thaiv tsev. Txhua yam khoom siv yuav tsum ua kom ntseeg tau thoob plaws tag nrho qhov ntsuas kub uas lub rhaub yuav tau ntsib.
