Dab tsi cais qhov zoo los ntawm qhov tsis zoo vuam hauv Molybdenum Welded Crucibles?

Qhov ntawd yog qhov chaw muab khoom siv tiag tiag. Molybdenum welding yog qhov nyuaj heev. Cov khoom no muaj cov thermal conductivity siab (138 W / m · K ntawm chav tsev kub, nqis mus rau 98 W / m · K ntawm 1,000 degree), ua rau poob kub sai. Thaum siab tshaj 600 degree, molybdenum oxidizes. Yog tias qhov ntsuas tsis raug tswj xyuas kom zoo, thaj chaw weld yog qhov ua rau micro- tawg vim qhov tsim ntawm nkig theem.

Electron beam welding (EBW) tau dhau los ua txoj hauv kev zoo tshaj plaws rau kev tsim khoom tseem ceeb crucibles. Cov txheej txheem ua haujlwm ntawm lub tshuab nqus tsev siab (10 degree) thiab tshem tawm kev pheej hmoo oxidation. Kev nkag mus ua los ntawm lub teeb tsom hluav taws xob tuaj yeem ncav cuag 25 mm, thiab qhov kub ntawm - thaj tsam cuam tshuam yog qhov tsawg heev. Lub tshav kub nqaim- thaj tsam cuam tshuam khaws cov ductility thiab nkag tsis kam ntawm cov hlau substrate, uas yog qhov tseem ceeb rau kev ua haujlwm siab ntev - kub.

Laser vuam muab lwm txoj hauv kev uas tsis tas yuav muaj lub tshuab nqus tsev rau cov phab ntsa nyias (5 hli). Niaj hnub nimno fiber ntau lasers nrog argon shielding yuav ua tau zoo welds nyob rau hauv qhov tseeb parameter tswj. Tus nqi feem ntau yog qhov nkag me me thiab ua haujlwm siab dua ntawm qhov chaw.

TIG welding tseem muaj nyob rau hauv kev tsim khoom, tab sis yuav tsum tau ceev faj txog kev tiv thaiv roj purity thiab ua ntej - vuam tu. Kuv tau pom TIG welding crucibles ua tsis tiav ntxov vim muaj oxide inclusions nyob rau hauv cov hlau weld, raws nraim hom defect ntawm helium huab hwm coj spectrometry leak nrhiav tau pom.

Cov lus qhia siv tau rau cov neeg yuav khoom crucible yog: Nug koj tus neeg muag khoom txog lawv cov txheej txheem vuam, cov txheej txheem tshuaj xyuas, thiab tus nqi tsis lees paub. Cov neeg muag khoom uas tsis kam qhia cov ntaub ntawv no yuav muaj qee yam zais.

Thermal cycling ua mob rau lub crucible ntau tshaj kev ua haujlwm tas mus li. Qhov pib- nce thiab kaw ntawm lub qhov cub yuav ua rau thermal gradient ntawm kev ntxhov siab ntawm phab ntsa. Yog tias koj cov txheej txheem cuam tshuam nrog cov khoom siv, xav txog cov phab ntsa tuab dua lossis molybdenum-lanthanum alloy variants nrog kev nkag siab zoo dua. Lub crucible uas tuaj yeem khiav sapphire kev loj hlob tsis tu ncua rau 2,000 teev yuav mus tsis ncaj ncees lawm tom qab 800 teev nrog lub voj voog 12-teev ib hnub.

Weld kev taw qhia tseem ceeb dua li cov neeg feem coob paub. Lub circumferential weld nyob rau hauv qab ntawm lub cylindrical crucible bears kev nyuaj siab concentration thaum lub sij hawm thermal cycling. Qee tus neeg tsim khoom yuav muab qhov vuam no tso rau hauv txoj haujlwm uas zam qhov chaw thermal gradient hauv qhov cub. Nug koj tus neeg muag khoom txog lawv cov tswv yim muab qhov chaw weld.

Kev sib kis ntawm cov khoom siv crucible tuaj yeem rhuav tshem cov muaju txawm tias lub crucible nws tus kheej tsis zoo. Cov khoom oxidation saum npoo, evaporation ntawm molybdenum ntawm qhov kub thiab txias, thiab cov kab hauv cov hlau matrix tuaj yeem ua rau cov pa phem. Rau qhov kho qhov muag - qib sapphire, peb feem ntau pom Al ₂ O ˚ kis tus kab mob tus nqi qis dua 0.003 ppm. Ua kom tiav qhov no yuav tsum muaj siab - cov khoom siv purity substrate thiab ua tib zoo kho qhov chaw ua ntej kev teeb tsa.

Hloov cov voj voog yuav tsum phim koj qhov kev pheej hmoo siab, tsis yog kev kwv yees lub neej ntawm cov khoom siv. Lub crucible yuav technically kav 3,000 teev. Tab sis yog tias muaj qee yam tsis raug ntawm 2,900 th teev nqi koj lub lim tiam ntawm lub sijhawm tsim khoom thiab ua rau koj txoj kev sib raug zoo nrog tus neeg siv khoom tseem ceeb, koj yuav tsum tau hloov nws ntawm 2,000 teev. Kev txheeb xyuas kev lag luam ntawm kev npaj hloov pauv piv rau kev ua haujlwm tsis zoo feem ntau nyob ntawm koj qhov xwm txheej tshwj xeeb.
 

Welded molybdenum crucibles sau ib qho tshwj xeeb, qhov loj me me, cov duab geometry nyuaj, lossis cov nqi txiav txim siab ua rau vuam qhov kev xaiv tsim khoom. Kev sib xyaw ua ke ntawm 2,620℃melting point, zoo thermal conductivity, thiab tsim nyog tsim nqi ua rau vuam crucibles active nyob rau hauv sapphire kev loj hlob, nqus metallurgy, thiab semiconductor ua.