Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm hydrated alumina feem ntau yog nyob rau hauv nws cov haujlwm tseem ceeb ua ntej, nplaim hluav taws xob, kev txhawb nqa catalyst, thiab cov tshuaj tiv thaiv dej hauv cov khoom siv kho mob. Cov txheej txheem tshwj xeeb txawv nyob ntawm daim ntawv thov.
1. Raws li alumina precursor: Thermal decomposition los ua kom muaj zog alumina. Hydrated alumina (xws li boehmite thiab pseudoboehmite) dehydrates thaum cua sov, hloov mus rau hauv alumina nrog cov siv lead ua sib txawv (xws li -Al₂O₃). Cov txheej txheem no yog qhov tseem ceeb rau kev npaj cov khoom siv alumina siab -.
Reaction Principple:
2AlOOH → ΔAl₂O₃ + H₂O 2AlOOH ΔAl₂O₃ + H₂O Txawv hydrated alumina precursors tuaj yeem siv los tswj cov qauv pore, thaj chaw tshwj xeeb, thiab siv lead ua daim ntawv ntawm alumina kawg los ntawm kev kho cov calcination kub thiab txheej txheem. Nws yog siv dav hauv kev txhawb nqa catalyst, ceramics, thiab lithium roj teeb cais cov ntaub ntawv . 2. Raws li nplaim taws Retardant: Dual Mechanism ntawm Endothermic Decomposition + Lub cev Barrier
Aluminium hydroxide (alumina trihydrate, Al (OH) ₃) yog cov khoom siv hluav taws xob ntau tshaj plaws. Nws txoj haujlwm ua haujlwm yog raws li hauv qab no:
Endothermic Cooling: Nws decomposes ntawm 200-250 degree, nqus cov cua kub ntau (kwv yees li 1967 kJ / kg), yog li txo qhov kub ntawm cov khoom.
2 Al(OH)₃ → Δ Al₂O₃ + 3 H₂O↑
2 Al(OH) ₃
Δ Al₂O₃ + 3H₂O↑
Dilution ntawm Combustible Gases: Cov dej vapor tso tawm dilutes cov concentration ntawm oxygen thiab combustible gases, inhibiting kev sib kis ntawm combustion.
Tsim Cov Txheej Txheem Tiv Thaiv: Cov khoom tsim tawm Al₂O₃ residue tsim cov txheej txheej ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom:
Siv dav hauv cov xov hlau thiab cables, yas, roj hmab, thiab lwm yam khoom siv polymer, nws khav theeb zoo xws li halogen{0}}dawb, qis- pa luam yeeb, thiab cov khoom zoo ib puag ncig.
3. Lub luag haujlwm hauv Anodized Film Sealing: Hydration Expansion Blocking Micropores
Hauv kev kho aluminium alloy nto, hydrated alumina txhim khu kev tiv thaiv corrosion los ntawm "hydration heat sealing":
Lub hauv paus ntsiab lus ntawm cov tshuaj tiv thaiv: Cov anodic oxide zaj duab xis (tsuas yog tsim los ntawm Al₂O₃) tau txais cov tshuaj tiv thaiv hydration hauv cov dej kub npau npau, tsim boehmite (AlOOH) los yog txhuas hydroxide, nthuav dav hauv ntim li ntawm 30%, yog li sau thiab kaw cov micropores ntawm oxide zaj duab xis.
Al₂O₃ + H₂O → 2AlOOH
Al₂O₃ + H₂O → 2AlOOH
Qhov no sealing ho txhim kho cov zaj duab xis corrosion kuj, anti- fouling muaj peev xwm, thiab colourfastness, ua rau nws lug siv nyob rau hauv architectural aluminium profiles thiab industrial aluminium alloy Cheebtsam.
4. Raws li lub catalyst / tshuaj nqa khoom: siab tshwj xeeb thaj chaw thiab kev ua haujlwm saum npoo. Hydrated alumina (tshwj xeeb tshaj yog boehmite) muaj thaj chaw siab tshwj xeeb (txog 200–300 m² / g) thiab ntau pawg hydroxyl pawg (-OH), nkag tau yooj yim adsorbing active Cheebtsam lossis tshuaj molecules.
Hauv roj av catalytic cracking (FCC), nws muab dispersibility thiab thermal stability raws li cov cab kuj; nyob rau hauv kev lag luam teb, nws muaj peev xwm adsorb antigens kom ua tiav kev tso tawm.
5. Daim ntawv thov hauv lithium-ion roj teeb cais: Txheej txhim khu kev nyab xeeb. Nano-boehmite (-AlOOH), ua cov khoom siv txheej rau lithium-ion roj teeb cais, ua lub luag haujlwm hauv qab no:
Kev kub siab ua haujlwm: Txhim kho qhov kev ruaj ntseg ntawm qhov sib cais ntawm qhov kub thiab txias, tiv thaiv shrinkage thiab luv circuits.
nplaim retardancy: Tso dej vapor thaum rhuab, inhibiting thermal runaway.
Tsawg hardness: Txo qhov hnav ntawm electrodes thiab khoom siv, txo cov nqi tsim khoom.
Hydrophobicity: Txhim kho cov roj teeb ruaj khov hauv qhov chaw ntub dej.
