Mullite Xuab Zeb
Mullite xuab zebyog ib hom aluminosilicate refractory khoom uas siv dav hauv kev lag luam foundry.
Cov Tshuaj Lom Zem Tseem Ceeb:
Cov khoom siv tshuaj lom neeg tseem ceeb ntawm cov xuab zeb mullite yog Aluminium Oxide (Al₂O₃) thiab Silicon Dioxide (SiO₂). Cov tshuaj lom neeg ib txwm muaj yog: 42% ≤ Al₂O₃ ≤ 47% thiab 51% ≤ SiO₂ ≤ 53%. Nws kuj muaj cov hlau Oxide me me (Fe₂O₃), Alkali Metal Oxides (Na₂O+K₂O), thiab lwm yam khoom me me.
Txheej Txheem Tsim Khoom:
Cov xuab zeb Mullite feem ntau yog tsim los ntawm kev siv cov zaub mov nplua nuj nyob rau hauv aluminosilicate, xws li kaolin, av nplaum tawv, lossis muscovite. Cov txheej txheem cuam tshuam nrog kev tsoo cov khoom siv raw, sib tov lawv nrog cov khoom ntxiv, thiab nias lawv rau hauv cov duab. Cov duab no tom qab ntawd raug calcined hauv lub cub tawg kub ntawm qhov kub ntawm 1300 ° C thiab 1550 ° C. Tom qab calcination, cov khoom raug crushing, kev tshuaj ntsuam, kev sib cais sib nqus kom tshem tawm hlau, thiab lwm yam txheej txheem kom tau txais cov khoom xuab zeb mullite ntawm ntau qhov loj me.
Cov Lus Qhia Txog Qhov Loj ntawm Cov Khoom Me Me:
Cov xuab zeb Mullite muaj ntau yam loj me. Peb cov khoom tseem ceeb suav nrog: 8-16 mesh, 16-30 mesh, 30-60 mesh, 60-80 mesh, thiab 80-120 mesh. Tsis tas li ntawd xwb, peb muab cov qib zoo dua hu ua hmoov mullite, xws li 200 mesh thiab 300 mesh.
Cov yam ntxwv ntawm kev ua tau zoo:
Kev kub hnyiab siab:Nrog rau qhov kub refractoriness ntawm kwv yees li 1750 ° C, nws zoo tiv taus qhov kub siab ntawm cov hlau molten thaum lub sijhawm casting, tiv thaiv lub plhaub pwm ntawm kev puas tsuaj.
Kev Ruaj Ntseg Thermal Zoo heev:Cov xuab zeb Mullite tswj tau qhov ruaj khov thaum raug kev hloov pauv ntawm qhov kub thiab txias. Nws tiv taus kev nthuav dav lossis kev sib cog lus ntawm cua sov, ua kom ntseeg tau tias cov castings raug.
Cov Khoom Siv Yooj Yim Shakeout:Tom qab casting, mullite xuab zeb tuaj yeem raug tshem tawm yooj yim (shakeout) ntawm cov castings. Qhov no txo qhov xav tau rau kev ua tiav tom qab thiab txhim kho kev ua haujlwm ntau lawm.
Kev Ua Zoo Tshaj Plaws:Siv cov xuab zeb mullite ua cov khoom siv plhaub ua rau cov castings nrog qhov chaw du. Nws txo qhov tsis zoo ntawm casting xws li cov qhov xuab zeb thiab cov qhov cua, yog li ua kom zoo dua qhov zoo ntawm cov castings.
| Cov Lus Qhia Tshwj Xeeb | Qib Noj Hmo | Qib 1 | Qib 2 |
| Al2O3 | 44% -45% | 43% -45% | 43% - 50% |
| SiO2 | 50% -53% | 50% -54% | 47% - 53% |
| Fe2O3 | ≤1.0% | ≤1.5% | ≤2.1% |
| K2O+Na2O | ≤0.5% | ≤0.6% | ≤0.8% |
| CaO | ≤0.4% | ≤0.5% | ≤0.5% |
| TiO2 | ≤0.3% | ≤0.7% | ≤0.3% |
| Xaustic Soda | ≤0.5% | ≤0.5% | ≤0.7% |
| Qhov Ceev Ntau | ≥2.5g/cm3 | ≥2.5g/cm3 | ≥2.45g/cm3 |
Lub hauv paus ntawm kev ua kom raug yog kev tsim cov pwm plhaub (cov txheej txheem ntawm kev txheej cov qauv quav ciab nrog ntau txheej ntawm cov khoom siv refractory los tsim lub plhaub sab nraud. Tom qab cov qauv quav ciab yaj, lub qhov yog tsim rau nchuav cov hlau molten). Mullite xuab zeb feem ntau yog siv ua cov khoom siv refractory hauv lub pwm plhaub thiab siv rau ntau txheej ntawm lub plhaub, tshwj xeeb raws li hauv qab no:
1. Lub plhaub nto (Txiav txim siab ncaj qha txog qhov zoo ntawm qhov chaw ntawm kev ua casting)
Kev Ua Haujlwm:Cov txheej saum npoo yog nyob rau hauv kev sib cuag ncaj qha nrog lub casting thiab yuav tsum xyuas kom meej tias qhov chaw tiav du (tsis txhob roughness thiab pitting) thaum tseem tiv taus qhov cuam tshuam thawj zaug ntawm cov hlau molten.
2. Lub Plhaub Tom Qab (Muab Tag Nrho Lub Zog thiab Kev Ua Pa Tau)
Kev Ua Haujlwm:Lub plhaub tom qab yog ib qho qauv ntau txheej sab nraum txheej saum npoo. Nws txhawb nqa lub zog tag nrho ntawm lub plhaub pwm (tiv thaiv kev hloov pauv lossis kev tawg thaum lub sijhawm nchuav) thaum ua kom muaj cua nkag tau (tso cov pa tawm ntawm qhov thiab tiv thaiv porosity hauv qhov casting).
3. Cov Ntawv Thov Tshwj Xeeb rau Kev Ua Castings Uas Xav Tau Ntau
Cov hlau castings kub siab:xws li cov hniav turbine ntawm lub cav dav hlau (qhov kub ntawm 1500-1600 ° C), xav kom lub plhaub pwm tiv taus qhov kub thiab txias heev. Mullite xuab zeb qhov refractoriness siab tuaj yeem hloov cov xuab zeb zircon kim dua (melting point 2550 ° C, tab sis kim), ua tau raws li qhov yuav tsum tau ua kom kub thiab txias thaum txo cov nqi.
Rau cov hlau reactive castings:xws li cov hlau txhuas thiab cov hlau magnesium (uas muaj zog heev thiab yooj yim cuam tshuam nrog SiO₂ hauv cov xuab zeb quartz los tsim cov khoom suav nrog), mullite xuab zeb lub zog tshuaj lom neeg tuaj yeem txo qhov ua haujlwm thiab tiv thaiv kev tsim cov "oxidation inclusions" hauv qhov casting.
Rau cov castings loj precision:xws li cov tsev rau lub tshuab cua turbine gearbox (uas tuaj yeem hnyav ntau tons), lub plhaub pwm xav tau lub zog siab dua. Cov txheej txheem thaub qab uas tsim los ntawm mullite xuab zeb thiab binder yog lub zog siab, txo qhov kev pheej hmoo ntawm pwm nthuav dav thiab vau.
4. Ua ke nrog lwm cov khoom siv refractory
Hauv kev tsim khoom tiag tiag, mullite xuab zeb feem ntau siv ua ke nrog lwm cov ntaub ntawv los ua kom zoo dua pwm plhaub kev ua tau zoo:
Kev sib xyaw nrog cov xuab zeb zircon:Xuab zeb zircon siv ua txheej saum npoo (kom paub tseeb tias qhov chaw tiav zoo dua) thiab xuab zeb mullite ua txheej thaub qab (kom txo cov nqi). Qhov no haum rau cov castings nrog qhov xav tau ntawm qhov chaw siab heev, xws li cov khoom siv aerospace.
Ua ke nrog cov xuab zeb quartz:Rau cov castings nrog qhov kub qis dua (xws li tooj liab alloy, melting point 1083 ℃), nws tuaj yeem hloov qee qhov quartz xuab zeb thiab siv qhov nthuav dav qis ntawm mullite xuab zeb los txo cov plhaub tawg.
| Cov Txheej Txheem Siv Rau Kev Ua Kom Zoo Nkauj Casting Plhaub | ||
| Cov slurry dav dav, zirconium hmoov | 325 mesh + silica sol | Xuab zeb: xuab zeb zirconium 120 mesh |
| Cov kua nplaum tom qab | 325 mesh + silica sol + mullite hmoov 200 mesh | Xuab zeb: xuab zeb mullite 30-60 mesh |
| Txheej txhawb zog | Mullite hmoov 200 mesh + silica sol | Xuab zeb: xuab zeb mullite 16-30 mesh |
| Cov kua nplaum kaw | Mullite hmoov 200 mesh + silica sol | _ |
Cov Lus Nug Feem Ntau
Xav tau kev pab? Nco ntsoov mus saib peb cov rooj sib tham txhawb nqa kom tau cov lus teb rau koj cov lus nug!
Peb yog cov chaw tsim khoom tiag tiag, peb lub Hoobkas tshwj xeeb hauv kev tsim cov khoom siv refractory rau ntau tshaj 30 xyoo. Peb cog lus tias yuav muab tus nqi zoo tshaj plaws, qhov kev pabcuam ua ntej muag thiab tom qab muag zoo tshaj plaws.
Rau txhua txoj kev tsim khoom, RBT muaj lub kaw lus QC tiav rau cov tshuaj lom neeg thiab cov khoom siv lub cev. Thiab peb yuav sim cov khoom, thiab daim ntawv pov thawj zoo yuav raug xa nrog cov khoom. Yog tias koj muaj cov kev xav tau tshwj xeeb, peb yuav sim peb qhov zoo tshaj plaws los pab txhawb lawv.
Nyob ntawm seb muaj pes tsawg, peb lub sijhawm xa khoom txawv. Tab sis peb cog lus tias yuav xa khoom sai li sai tau nrog kev lees paub zoo.
Tau kawg, peb muab cov qauv dawb.
Yog, tau kawg, koj tuaj yeem mus xyuas RBT lub tuam txhab thiab peb cov khoom.
Tsis muaj kev txwv, peb tuaj yeem muab cov lus qhia zoo tshaj plaws thiab kev daws teeb meem raws li koj qhov xwm txheej.
Peb tau ua cov khoom siv refractory rau ntau tshaj 30 xyoo, peb muaj kev txhawb nqa kev txawj ntse thiab kev paub nplua nuj, peb tuaj yeem pab cov neeg siv khoom tsim cov cub tawg sib txawv thiab muab kev pabcuam ib zaug.
