Qhuav magnesium oxide tuaj yeem tswj hwm nws cov dej num rau ntau tshaj 6 lub hlis nyob rau hauv qhov chaw kaw cia. Txawm li cas los xij, yog tias raug rau qhov chaw ntub dej, nws yuav pib nqus dej noo thiab poob nws cov haujlwm hauv ib teev. Tus nqi ntawm deterioration feem ntau nyob ntawm cov av noo, kub, thiab sealing ntawm qhov chaw cia.
1. Deterioration Mechanism: Moisture Absorption Triggers Chemical Change
Qhuav magnesium oxide (MgO) yog reactive heev thiab reacts tshuaj nrog dej molecules nyob rau hauv cov huab cua los tsim magnesium hydroxide (Mg (OH) ₂). Cov tshuaj tiv thaiv no yog irreversible, thiab cov khoom yog ruaj khov heev (nws tsis decompose hauv qab 340 degree), ua rau ib tug mus tas li txo nyob rau hauv cov kev ua ntawm magnesium oxide.
Yog tias ib puag ncig muaj CO₂, nws yuav ntxiv cov magnesium carbonate, ua rau kev ua haujlwm tsis zoo.
Thaum hloov mus rau magnesium hydroxide, nws lub peev xwm hygroscopic thiab tshuaj lom neeg ua haujlwm tau txo qis, thiab nws suav tias yog "deteriorated."
2. Kev sib piv ruaj khov nyob rau hauv cov xwm txheej sib txawv
|
Kev cia khoom |
Lub Sijhawm Kawg |
Tus nqi tuav haujlwm (3 lub hlis) |
Siv tau Scenarios |
|
Sealed + Desiccant + Txias |
>6 hli |
>95% |
High Purity / Electronic Qib Raw Khoom |
|
Muab ob npaug rau-Txheej Nrawm- Pov Thawj Hnab Ntim |
3–6 Lub Hlis |
85%–90% |
Kev siv dav dav |
|
Ordinary Woven Bag + Indoor Storage |
1–3 Lub Hlis |
70%–80% |
Luv -Tsev siv sijhawm |
|
Open Exposure to Air (RH >60%) |
24-72 teev |
<50% |
Txwv tsis pub |
Cov ntaub ntawv siv los ntawm kev saib xyuas lub tsev khaws khoom tiag tiag thiab cov lus pom zoo ntawm kev lag luam tus qauv.
3. Yam tseem ceeb cuam tshuam rau tus nqi tas sij hawm
Ambient Humidity: Moisture nqus tus nqi nce siab heev thaum txheeb ze av noo> 50%.
Packing Integrity: Cov kua muag me me los yog cov sealing tsis zoo tuaj yeem ua kom cov dej nqus dej ntau dua 3 zaug.
Temperature Fluctuations: Loj diurnal kub variations yooj yim ua rau condensation, accelerating hydration tshua.
Raw Material Activity: Magnesium oxide muaj zog heev (xws li, iodine nqus tus nqi> 150) yog hygroscopic ntau dua thiab yuav tsum muaj kev tiv thaiv nruj dua.
4. Cov lus pom zoo rau kev ncua lub neej txee
Ua ntej ntim me me: Txo qhov kev pheej hmoo ntawm kev raug rov qab los ntawm kev qhib lub pob.
Ntxiv Built-hauv Desiccant: Muab silica gel los yog cov khoom siv magnesium oxide desiccant rau hauv lub ntim.
Nitrogen-Filled Sealed Cia: Tsim nyog rau cov khoom muaj txiaj ntsig siab -, cais cov dej noo thiab oxygen.
Kev Ntsuam Xyuas Kev Ua Haujlwm Tsis tu ncua: Ntsuas cov dej noo lossis cov ntsiab lus magnesium oxide txhua txhua 30 hnub kom tswj tau qhov zoo.
Rau cov ntawv thov tseem ceeb (xws li cov khoom siv tshuaj thiab cov ntim hluav taws xob), nws raug nquahu kom siv tsis pub dhau 3 lub hlis thiab txheeb xyuas qhov ziab ntawm qhov siv qhov hnyav tas li.
