Txheej txheem cej luam Graphite Crucible

Txheej txheem cej luam
Lub graphite crucibleyog tsim los ntawm ntuj flake graphite ua cov khoom siv tseem ceeb, thiab ua tiav nrog cov yas refractory av nplaum los yog carbon raws li cov ntaub ntawv. Nws muaj cov yam ntxwv ntawm qhov kub thiab txias tsis kam, muaj zog thermal conductivity, zoo corrosion kuj, thiab kev pab lub neej ntev. Thaum siv qhov kub thiab txias, coefficient ntawm thermal expansion yog me me, thiab nws muaj qee yam kev ua haujlwm tsis zoo rau kev ua kom txias thiab cua sov. Nws muaj zog corrosion kuj rau acidic thiab alkaline daws, zoo heev tshuaj stability, thiab tsis koom nyob rau hauv tej tshuaj tiv thaiv thaum lub sij hawm melting txheej txheem. Lub puab phab ntsa ntawm cov graphite crucible yog du, thiab cov kua hlau molten tsis yooj yim rau xau thiab ua raws li cov phab ntsa sab hauv ntawm lub crucible, ua rau cov kua hlau muaj cov dej ntws zoo thiab muaj peev xwm casting, haum rau casting thiab tsim ntau yam pwm sib txawv. Vim yog cov yam ntxwv zoo saum toj no, graphite crucibles tau siv dav hauv kev smelting ntawm cov cuab yeej hlau hlau thiab cov hlau tsis muaj hlau thiab lawv cov alloys.

Hom
Graphite crucibles feem ntau yog siv rau melting ntawm cov ntaub ntawv hlau, uas tau muab faib ua ob hom: ntuj graphite thiab dag graphite.
1) Ntuj graphite
Nws yog tsuas yog ua los ntawm ntuj flake graphite ua cov khoom siv tseem ceeb, nrog rau cov av nplaum thiab lwm yam khoom siv refractory. Nws yog feem ntau hu ua av nplaum graphite crucible, thaum cov pa roj carbon binder hom crucible yog ua nrog asphalt li cov ntawv khi. Nws yog tsim los ntawm sintering quab yuam ntawm av nplaum thiab hu ua Hui av nplaum binder hom crucible. Lub qub muaj superior zog thiab thermal shock kuj. Nws yog siv rau melting hlau, tooj liab, tooj liab alloys, thiab lwm yam uas tsis yog-ferrous hlau, nrog rau ntau qhov ntau thiab tsawg thiab melting muaj peev xwm ntawm 250g mus rau 500kg.
Hom crucible no suav nrog cov khoom siv xws li rab diav skimming, hau, lub nplhaib sib koom, kev txhawb nqa crucible, thiab cov pas nrig nplawm.
2) Artificial graphite
Lub ntuj graphite crucibles hais saum toj no feem ntau muaj txog 50% av nplaum ntxhia, thaum lub impurities (cov ntsiab lus tshauv) nyob rau hauv dag graphite crucibles tsawg dua 1%, siv rau refining high-purity hlau. Kuj tseem muaj cov purity graphite uas tau ua tiav kev kho kom huv tshwj xeeb (cov ntsiab lus tshauv <20ppm). Artificial graphite crucibles feem ntau yog siv los yaj me me ntawm cov hlau tseem ceeb, cov hlau purity siab, los yog cov hlau melting point hlau thiab oxides siab. Nws kuj tseem tuaj yeem siv los ua lub crucible rau kev tsom xam roj hauv cov hlau.

Cov txheej txheem ntau lawm
Cov txheej txheem tsim khoom ntawm graphite crucibles tuaj yeem muab faib ua peb hom: tes molding, rotational molding, thiab compression molding. Qhov zoo ntawm lub crucible yog ze ze rau cov txheej txheem molding. Txoj kev tsim txiav txim siab tus qauv, qhov ntom ntom, qhov porosity, thiab lub zog txhua yam ntawm lub cev crucible.
Tes molded crucibles rau lub hom phiaj tshwj xeeb tsis tuaj yeem tsim los ntawm kev siv teb los yog compression molding txoj kev. Qee qhov tshwj xeeb zoo li tus crucibles tuaj yeem tsim los ntawm kev sib txuas ua ke moulding thiab tes molding.
Rotary molding yog txheej txheem uas lub tshuab ua haujlwm tuaj yeem tsav cov pwm ua haujlwm thiab siv rab riam sab hauv los extrude av nplaum kom tiav cov crucible molding.
Compression molding yog siv cov cuab yeej siv siab xws li roj siab, dej siab, lossis huab cua siab raws li lub zog kinetic, siv cov pwm hlau ua cov cuab yeej yas rau kev tsim khoom. Piv nrog rau txoj kev molding teb, nws muaj qhov zoo ntawm cov txheej txheem yooj yim, luv luv voj voog, siab yield thiab efficiency, tsawg zog siv, tsawg molding ya raws, tsawg crucible shrinkage thiab porosity, khoom zoo thiab ceev.

Kev saib xyuas thiab khaws cia
Graphite crucibles yuav tsum tau tiv thaiv los ntawm noo noo. Graphite crucibles feem ntau ntshai ntawm noo noo, uas tuaj yeem cuam tshuam rau qhov zoo. Yog tias siv nrog lub pob zeb ntub dej, nws tuaj yeem ua rau tawg, tawg, ntug ntog, thiab hauv qab ntog, ua rau poob ntawm cov hlau molten thiab txawm tias muaj xwm txheej ua haujlwm. Yog li ntawd, thaum khaws cia thiab siv graphite crucibles, yuav tsum tau them nyiaj rau kev tiv thaiv noo noo.
Lub warehouse rau khaws cia graphite crucibles yuav tsum qhuav thiab ventilated, thiab qhov kub thiab txias yuav tsum tau tswj ntawm 5 ℃ thiab 25 ℃, nrog ib tug txheeb ze humidity ntawm 50-60%. crucibles yuav tsum tsis txhob muab khaws cia rau hauv av cib lossis cement hauv av kom tsis txhob ya raws. Qhov loj graphite crucible yuav tsum tau muab tso rau ntawm ib tug ntoo ncej, nyiam dua 25-30cm saum av; Muab ntim rau hauv cov thawv ntoo, pob tawb, lossis cov hnab straw, cov neeg pw tsaug zog yuav tsum muab tso rau hauv qab pallets, tsis pub tsawg dua 20cm saum av. Muab ib txheej ntawm kev xav ntawm cov neeg pw tsaug zog zoo dua rau kev tiv thaiv dej noo. Thaum lub sij hawm ib lub sij hawm ntawm stacking, nws yog ib qho tsim nyog yuav tsum tau muab cov txheej sab saud upside down, nyiam dua nrog cov khaubncaws sab nraud povtseg sab sauv thiab sab sab. Lub sijhawm nruab nrab ntawm stacking thiab stacking yuav tsum tsis txhob ntev dhau. Feem ntau, stacking yuav tsum tau ua ib zaug txhua ob lub hlis. Yog tias cov av noo tsis siab, stacking tuaj yeem ua tiav ib zaug txhua peb lub hlis. Nyob rau hauv luv luv, nquag stacking yuav ua tau zoo noo noo-pov thawj nyhuv.