1. Taw qhia rau Graphite CruciBles
Graphite shreglesyog cov cuab yeej tseem ceeb hauv kev lag luam hlau casting. Tab sis dab tsi ua rau lawv muaj txiaj ntsig, thiab vim li cas kev ua kom pom kev vam meej ntawm graphite tshaj lwm cov ntaub ntawv? Txhua yam nws los txog rau cov khoom tshwj xeeb ntawm graphite: siab thermal conductivity, tshwj xeeb cov cua sov tsis kam, thiab cov tshuaj ruaj khov.
Siv dav hauv kev lag luam zoo li cov hlau casting, thiab cov pob zeb hlau ua kom zoo nkauj, cov teeb tsa muaj nqis tau ntseeg rau kev tuav cov ntsuas kub thiab ntau yam hlau. Lawv yog tshwj xeeb tshaj yog nyob rau hauv cov txheej txheem uas muaj cov pej xeem muaj zog los yog cov hluav taws kub siab induction. Graphite cross crucles tsis tsuas yog tiv thaiv cov mob hnyav tab sis kuj tseem ua kom muaj kev sib kis tau tsawg, uas yog qhov tseem ceeb rau kev coj dawb huv hauv cov hlau casting.
2. Nkag siab graphite melting point thiab kub txwv
2.1. Melting kub ntawm graphite
Graphite muaj ib qho incredibly melting taw tes-ncig 3,600 ° C (6,512 ° F). Qhov ntsuas kub no nyob deb dhau ntawm cov ntsiab lus melting ntawm cov hlau feem ntau cov txheej txheem hauv partries, xws li:
- Tooj liab: 1,085 ° C (1,984 ° F)
- Tooj dawb: 660 ° C (1,220 ° F)
- Liv: 1,538 ° C (2,800 ° F)
Vim tias qhov no, graphite yog cov zoo meej rau cov ntawv thov uas khaus tshav kub ruaj khov yuav tsum tau. Thaum graphite tsis nquag ncav nws lub zog melting hauv cov chaw muaj kev lag luam, nws lub siab kub ua kom sov thiab lub sijhawm thaum muaj cua sov heev.
2.2. Graphite crucible kub ntau yam
Feem ntau graphite crucibles muaj qhov ntsuas kom tiv thaiv kub ntawm 1,800 ° C txog rau 2,800 ° C nyob ntawm lawv cov kev sib xyaw thiab cov txheej txheem tsim khoom lag luam. Qhov kev kub siab no ua rau graphite crucles haum rau ntau cov ntawv thov, los ntawm melting lub hauv paus cov hlau zoo li tooj liab thiab txhuas los tuav alloys thiab txawm noble hlau.
| Hlau | Melting point (° C) | Pom zoo cov ntaub Crucible Crucible Crucible |
|---|---|---|
| Tooj liab | 1,085 | Graphite, silicon carbide |
| Tooj dawb | 660 | Graphite, av nplaum |
| Nyiaj | 961 | Npaim |
| Kub | 1,064 | Npaim |
| Hlau | 1,370 - 1,520 | Graphite, silicon carbide |
Nco tseg: Cov lus no hais txog cov duab puab zoo li cas muab cov lus uas xav tau rau ntau yam me me.
3. Graphite crucaibles thiab lwm cov ntaub ntawv Crucible
Tsis yog txhua tus crucaibles tau tsim sib npaug. Ntawm no yog li cas graphite sib piv rau lwm cov khoom siv nrov:
- Refractory cement cruciles: Paub rau lawv cov txiaj ntsig durability thiab tus nqi-ua tau zoo, refractory cement cruciles ua haujlwm tau zoo hauv kev thov nrog kev kub ntxhov. Txawm li cas los xij, lawv tsis muaj peev xwm siab kub thiab thermal poob siab tsis ntawm graphite.
- Silica thiab cov ceramic crucosles: Cov no yog feem ntau siv rau cov alloys tshwj xeeb lossis kev kuaj kab tab sis zoo li tsis tshua muaj neeg siv hluav taws xob siab. Lawv kuj tseem muaj kev cuam tshuam ntau dua rau kev poob siab, tshwj xeeb tshaj yog nyob rau hauv cov cua kub sai thiab cua txias mus ncig.
| Khoom Crucible Khoom | Max kub (° C) | Cov ntawv thov zoo tagnrho |
|---|---|---|
| Npaim | 1,800 - 2,800 | Qhov Kub-Kub Hlau Casting, Refining |
| Silicon Carbide | 1,650 - 2,200 | Cov hlau ua hlau, alloys |
| Refractory Mement | 1,300 - 1,800 | Moderate Cov Haujlwm Ntsuas |
| Sillica | 1,600 - 1,800 | Kuaj thiab Tshuaj Siv Tshuaj |
3.1. Vim li cas thiaj xaiv graphite?
Graphite exels qhov twg lwm cov ntaub ntawv falter. Nws txoj kev tawm tsam rau tshuaj corrosion, tsis muaj peev xwm tiv thaiv cua sov ua rau nws qhov kev xaiv zoo dua rau cov hlau casting lag luam. Graphite qhov tsis-reactivity nrog Molten cov hlau kuj txwv tsis pub muaj kev paug, ua kom cov khoom lag luam zoo kawg.
4. Xaiv txoj cai Crucible rau cov hlau casting
Xaiv cov ntawv muaj tseeb yog qhov ntau dua li paub txog qhov ntsuas kub.. Nov yog qee yam los txiav txim siab:
- Crucible loj: Graphite crucibles tuaj ntau qhov ntau thiab tsawg, los ntawm kev kuaj me me, los ntawm cov qauv hluav taws xob me me rau kev siv cov qauv hluav taws xob muaj peev xwm tuav ntau pua pua ntawm cov hlau. Qhov loj crucible yuav tsum tau xaiv raws li qhov ntim ntawm cov hlau ua thiab hom cua sov.
- Lub cev: Crucibles muaj nyob rau hauv ntau cov duab, xws li cylindrical, conical, thiab hauv qab-ncuav tsim. Cov duab cuam tshuam cov pouring efficiency, thermal faib, thiab yooj yim ntawm kev tuav.
- Qhov ntsuas kub ntau: Ib txwm txheeb xyuas qhov kub kub ua rau koj lub crucible, tshwj xeeb tshaj yog thaum ua haujlwm nrog cov hlau uas yuav tsum muaj cua sov-ntau, xws li hlau thiab tooj.
| Crucible ntaus | Zoo tshaj plaws rau | Cov txiaj ntsig |
|---|---|---|
| Lub cylindrical | Kev Ua Lag Luam General | Txawm tias kev faib khoom cua sov, ntau yam |
| Kev | Precision Pouringing | Yooj yim nchuav, txo cov txeej |
| Hauv qab-ncuav | Cov ntawv thov loj loj | Siv cov khoom txaus ntws, txo kom txo qis |
5. Graphite Cov Chaw Tsim Tshuaj Crucible thiab Kev Txiav Txim Zoo
Xaiv ib txoj kev ntseeg siabGraphite crucibleCov chaw tsim khoom yog qhov tseem ceeb rau kev ua haujlwm ua haujlwm thiab ntev ntawm koj cov khoom siv. Nov yog qee qhov tseem ceeb los nrhiav hauv cov chaw tsim khoom:
- Khoom Zoo: High-purity graphite ensures zoo dua kub tsis kam, minimizes hnav, thiab txo cov impurities.
- Cov txheej txheem tsim khoom: Cov tswv yim zoo li isostatic mus ua rau denser crucibles uas tiv thaiv qhov kub hloov tau zoo dua.
- Kev Xaiv Kev Cai: Qee cov tuam ntxhab muab cov kev cai thiab cov duab kom phim cov kev lag luam muaj.
Ua haujlwm nrog cov neeg tsim khoom siv tsis yog tuaj yeem lav cov khoom zoo xwb tab sis kuj nkag mus rau cov kws tshaj lij hauv kev xaiv cov crucible rau cov ntawv thov tshwj xeeb.
6. Saib xyuas thiab txij nkawm ntawm graphite crucosles
Kev saib xyuas kom zoo rau lub neej ntawm graphite crucibles thiab ua kom ua tiav kev ua tau zoo sib xws. Nov yog qee cov lus qhia txij nkawm:
- Preheating: Ib txwm preheat grucite crucible ua ntej nws thawj zaug siv los tsav tawm txhua qhov chaw noo noo thiab tiv thaiv kev tawg.
- Zam kev hloov kom sov: Graphite yog resistant rau thermal poob siab, tab sis tam sim ntawd zoo heev rau kev hloov hluav taws xob tuaj yeem ua rau puas.
- Huv si tsis tu ncua: Cov ntawv seem hlau tuaj yeem hnov mob nrog graphite, muaj peev xwm ua kom lub crucible. Kev ntxuav tu tom qab txhua qhov kev siv tiv thaiv tsim-up.
- Chaw ntim khoom: Khaws Graphite crucosles nyob rau hauv ib qho chaw qhuav kom tiv thaiv kev nqus dej noo, uas tuaj yeem ua rau thermal poob siab ntawm rheating.
Ua raws li cov theem no pab tswj cov qauv txheej txheem kev ntseeg siab thiab thermal kev ua tau ntawm graphite crucas, txo qhov xav tau kev hloov pauv ntau zaus.
7. Cov lus nug nquag (FAQ)
- Dab tsi yog qhov siab tshaj plaws kub ntawm graphite crucible tuaj yeem tiv taus?
Feem ntau graphite crucoses tuaj yeem tswj tau txog 2,800 ° C, nyob ntawm lawv cov ntawv thov zoo thiab tshwj xeeb. - Muaj peev xwm graphite yuav siv nrog cov khoom siv txhuas ua?
Yog lawm, cov crucibles yog qhov zoo tagnrho rau cov khoom siv txhuas, muab cov khoom ruaj khov ntawm Aluminium melting point thiab ua kom muaj zog tsawg tsawg. - Dab tsi yog txoj hauv kev zoo tshaj plaws rau kev saib xyuas graphite crucible?
Preheat crucible, zam kev hloov kom sov sai, thiab huv nws tsis tu ncua nws lifespan.
8. Vim li cas thiaj li xaiv peb li koj cov neeg xa khoom cia siab?
Raws li ib tug thawj coj ntawm cov kev ua haujlwm siab graphite, peb nkag siab qhov xav tau kev xav tau ntawm kev lag luam pov. Ntawm no yog vim li cas koom nrog peb yog tus ntse xaiv:
- Tshwj Xeeb Cov Khoom Siv Zoo: Peb graphite crucibles yog tsim los ntawm high-purity graphite los xyuas kom meej zoo heev kub tsis kam thiab kav ntev.
- Kev Lag Luam Kev Ua Haujlwm: Nrog rau xyoo ntawm kev paub, peb muab cov kev daws teeb meem rau txhua hom hlau casting daim ntawv thov.
- Customizable Xaiv: Peb muab ntau qhov sib luag ntawm cov kab ntoo uas muaj ntau, cov duab, thiab kev tiv thaiv kub thiab kub kom sib ntsib.
- Txhawb kev txhawb nqa: Los ntawm kev xaiv txoj cai crucible los muab cov lus qhia tom qab yuav khoom, peb pab neeg nyob ntawm no los txhawb koj txhua kauj ruam.
Npaj txhij los txhim kho koj cov txheej txheem casting nrog hwm Graphite CruciBles?Tiv Tauj PebHnub no los tshawb txog peb cov khoom ntau heev thiab tshawb nrhiav vim li cas peb yog kev xaiv tau kom muaj kev ntseeg siab thiab cam khwb cov kws tshaj lij thoob ntiaj teb.
Lub Sijhawm Post: Nov-11-2024