Tsab xov xwm ob ntu no sau luv luv txog cov ntsiab lus tseem ceeb ntawm tsab xov xwm txog kev siv hluav taws xob thiab saib ua ntej Tverberg qhov kev nthuav qhia ntawm InterPhex tom qab lub hlis no. Hnub no, hauv Ntu 1, peb yuav tham txog qhov tseem ceeb ntawm kev siv hluav taws xob los ntxuav cov kav hlau tsis xeb, cov txheej txheem siv hluav taws xob, thiab cov txheej txheem tshuaj xyuas. Hauv ntu thib ob, peb nthuav qhia cov kev tshawb fawb tshiab tshaj plaws ntawm cov kav hlau tsis xeb uas tau siv tshuab los ntxuav.
Ntu 1: Cov Kav Hlau Stainless Hlau Electropolished Cov kev lag luam tshuaj thiab semiconductor xav tau ntau cov kav hlau stainless hlau electropolished. Hauv ob qho tib si, 316L stainless hlau yog cov hlau sib xyaw nyiam. Cov hlau stainless hlau nrog 6% molybdenum qee zaum siv; cov hlau sib xyaw C-22 thiab C-276 yog qhov tseem ceeb rau cov chaw tsim khoom semiconductor, tshwj xeeb tshaj yog thaum cov roj hydrochloric acid siv los ua cov khoom siv etchant.
Yooj yim piav qhia txog qhov tsis zoo ntawm qhov chaw uas yuav raug zais rau hauv qhov kev sib tw ntawm qhov tsis zoo ntawm qhov chaw uas pom muaj nyob rau hauv cov ntaub ntawv uas pom ntau dua.
Qhov tshuaj lom neeg tsis muaj zog ntawm cov txheej passivating yog vim qhov tseeb tias ob qho tib si chromium thiab hlau nyob hauv lub xeev oxidation 3+, thiab tsis yog cov hlau zerovalent. Cov nplaim polished mechanically khaws cov ntsiab lus siab ntawm cov hlau dawb hauv zaj duab xis txawm tias tom qab ntev thermal passivation nrog nitric acid. Qhov no ib leeg muab cov nplaim electropolished ib qho zoo heev hauv kev ruaj khov mus sij hawm ntev.
Lwm qhov sib txawv tseem ceeb ntawm ob qho chaw yog qhov muaj (hauv cov chaw uas tau txhuam los ntawm tshuab) lossis tsis muaj (hauv cov chaw uas tau txhuam los ntawm tshuab). Cov chaw uas tau txhuam los ntawm tshuab tseem khaws cov khoom sib xyaw tseem ceeb nrog kev poob me ntsis ntawm lwm cov khoom sib xyaw, thaum cov chaw uas tau txhuam los ntawm tshuab feem ntau tsuas muaj chromium thiab hlau xwb.
Ua cov kav dej electropolished Yuav kom tau txais qhov chaw du electropolished, koj yuav tsum pib nrog qhov chaw du. Qhov no txhais tau tias peb pib nrog cov hlau zoo heev, tsim rau qhov zoo tshaj plaws weldability. Kev tswj hwm yog qhov tsim nyog thaum yaj sulfur, silicon, manganese thiab deoxidizing cov ntsiab lus xws li txhuas, titanium, calcium, magnesium thiab delta ferrite. Lub strip yuav tsum tau kho cua sov kom yaj cov theem thib ob uas yuav tsim thaum lub sijhawm yaj khov lossis tsim thaum lub sijhawm ua haujlwm kub siab.
Ntxiv mus, hom kab txaij tiav yog qhov tseem ceeb tshaj plaws. ASTM A-480 teev peb qhov chaw ua tiav ntawm cov kab txaij txias uas muaj nyob hauv khw: 2D (cua annealed, pickled, thiab blunt dov), 2B (cua annealed, dov pickled, thiab dov polished), thiab 2BA (ci annealed thiab tiv thaiv polished). cua. yob).
Yuav tsum tau ua tib zoo tswj xyuas kom cov yeeb nkab puag ncig zoo tshaj plaws. Tom qab txhuam, txawm tias qhov vuam me me lossis kab tiaj tiaj ntawm cov hlaws yuav pom tseeb. Tsis tas li ntawd, tom qab txhuam hluav taws xob, cov cim ntawm kev dov, cov qauv dov ntawm cov vuam thiab txhua yam kev puas tsuaj rau qhov chaw yuav pom tseeb.
Tom qab kev kho cua sov, lub cheeb sab hauv ntawm cov yeeb nkab yuav tsum tau txhuam kom tshem tawm cov qhov tsis zoo ntawm qhov chaw thaum lub sijhawm tsim cov kab txaij thiab cov yeeb nkab. Nyob rau theem no, kev xaiv ntawm cov kab txaij tiav yuav tseem ceeb heev. Yog tias qhov quav tob dhau, yuav tsum tshem tawm ntau cov hlau ntawm qhov chaw ntawm lub cheeb sab hauv ntawm cov yeeb nkab kom tau txais lub raj du. Yog tias qhov roughness tsis tob lossis tsis muaj, yuav tsum tshem tawm tsawg dua cov hlau. Qhov zoo tshaj plaws electropolished tiav, feem ntau nyob rau hauv 5 micro-inch ntau yam lossis du dua, yog tau los ntawm longitudinal band polishing ntawm cov yeeb nkab. Hom polishing no tshem tawm feem ntau ntawm cov hlau ntawm qhov chaw, feem ntau nyob rau hauv 0.001 nti ntau yam, yog li tshem tawm cov ciam teb noob, qhov tsis zoo ntawm qhov chaw, thiab cov qhov tsis zoo tsim. Whirling polishing tshem tawm cov khoom siv tsawg dua, tsim ib qho "cloudy" nto, thiab feem ntau tsim Ra siab dua (qhov nruab nrab ntawm qhov chaw roughness) hauv 10-15 microinch ntau yam.
Kev Siv Hluav Taws Xob (Electropolishing) Kev siv hluav taws xob tsuas yog ib txheej txheej rov qab xwb. Cov tshuaj electropolishing raug pumped hla lub raj sab hauv thaum lub cathode raug rub los ntawm lub raj. Cov hlau raug tshem tawm ntawm cov ntsiab lus siab tshaj plaws ntawm qhov chaw. Cov txheej txheem "vam tias" yuav galvanize lub cathode nrog cov hlau uas yaj los ntawm sab hauv lub raj (piv txwv li, lub anode). Nws yog ib qho tseem ceeb kom tswj tau cov electrochemistry kom tiv thaiv cathodic txheej thiab kom tswj tau qhov tseeb rau txhua ion.
Thaum lub sijhawm electropolishing, cov pa oxygen raug tsim rau ntawm qhov chaw ntawm anode lossis stainless hlau, thiab hydrogen raug tsim rau ntawm qhov chaw ntawm cathode. Cov pa oxygen yog cov khoom tseem ceeb hauv kev tsim cov khoom tshwj xeeb ntawm cov nplaim electropolished, ob qho tib si kom nce qhov tob ntawm cov txheej passivation thiab los tsim cov txheej passivation tiag tiag.
Kev siv hluav taws xob electropolishing tshwm sim nyob rau hauv qab txheej hu ua "Jacquet", uas yog ib qho polymerized nickel sulfite. Txhua yam uas cuam tshuam rau kev tsim ntawm Jacquet txheej yuav ua rau muaj qhov chaw electropolished tsis zoo. Qhov no feem ntau yog ib qho ion, xws li chloride lossis nitrate, uas tiv thaiv kev tsim ntawm nickel sulfite. Lwm cov tshuaj cuam tshuam yog silicone roj, roj, waxes thiab lwm yam hydrocarbons ntev.
Tom qab electropolishing, cov raj tau ntxuav nrog dej thiab ntxiv rau passivated hauv kub nitric acid. Qhov passivation ntxiv no yog qhov tsim nyog los tshem tawm cov seem nickel sulfite thiab txhim kho qhov sib piv ntawm chromium thiab hlau ntawm qhov chaw. Cov raj passivated tom qab ntawd tau ntxuav nrog dej txheej txheem, muab tso rau hauv dej kub deionized, ziab thiab ntim. Yog tias xav tau kev ntim khoom hauv chav huv, cov raj kuj raug ntxuav ntxiv hauv dej deionized kom txog thaum ncav cuag qhov conductivity teev tseg, tom qab ntawd ziab nrog kub nitrogen ua ntej ntim.
Cov txheej txheem feem ntau rau kev tshuaj xyuas cov nplaim electropolished yog Auger electron spectroscopy (AES) thiab X-ray photoelectron spectroscopy (XPS) (tseem hu ua kev tshuaj ntsuam electron spectroscopy). AES siv cov electrons tsim nyob ze ntawm qhov chaw los tsim cov cim tshwj xeeb rau txhua lub ntsiab lus, uas muab kev faib tawm ntawm cov ntsiab lus nrog qhov tob. XPS siv cov X-rays mos uas tsim cov spectra khi, tso cai rau cov hom molecular kom paub qhov txawv los ntawm lub xeev oxidation.
Tus nqi roughness ntawm qhov chaw uas muaj qhov profile zoo ib yam li qhov tsos ntawm qhov chaw tsis tau txhais hais tias zoo ib yam li qhov tsos ntawm qhov chaw. Feem ntau cov profilers niaj hnub no tuaj yeem tshaj tawm ntau tus nqi roughness ntawm qhov chaw sib txawv, suav nrog Rq (tseem hu ua RMS), Ra, Rt (qhov sib txawv siab tshaj plaws ntawm qhov tsawg kawg nkaus thiab qhov siab tshaj plaws), Rz (qhov siab nruab nrab ntawm qhov profile siab tshaj plaws), thiab ntau lwm tus nqi. Cov lus qhia no tau txais los ntawm ntau yam kev xam suav siv ib qho kev hla ncig qhov chaw nrog tus cwj mem pob zeb diamond. Hauv qhov kev hla no, ib feem hu ua "cutoff" raug xaiv hauv hluav taws xob thiab kev xam suav yog raws li qhov no.
Cov nto tuaj yeem piav qhia tau zoo dua los ntawm kev siv kev sib xyaw ua ke ntawm cov nqi tsim qauv sib txawv xws li Ra thiab Rt, tab sis tsis muaj ib qho haujlwm uas tuaj yeem paub qhov txawv ntawm ob qhov chaw sib txawv nrog tib tus nqi Ra. ASME tshaj tawm tus qauv ASME B46.1, uas txhais lub ntsiab lus ntawm txhua qhov kev suav lej.
Yog xav paub ntxiv hu rau: John Tverberg, Trent Tube, 2015 Energy Dr., PO Box 77, East Troy, WI 53120. Xov tooj: 262-642-8210.