Hnub no kuv yuav qhia cov magnesium oxide hauv lub raj cua sov ua hluav taws xob nrog cov neeg siv khoom tshiab thiab qub. Muaj ntau cov khoom qhuav hauv qhov kev sib qhia no, thiab kuv vam tias yuav pab tau kuv cov phooj ywg zoo zuj zus tuaj. Kuv kuj vam tias txhua tus yuav nyiam thiab xaiv peb cov khoom lag luam zoo dua.
Magnesium oxide hmoov hais txog fused crystalline magnesium oxide block uas tau sib tsoo thiab sib phim nrog qhov sib txawv me me los sis cov lej hauv qee qhov kev faib ua feem, ncaj qha lossis hloov kho, siv hauv tubular hluav taws xob cua sov ua ib qho insulating nruab nrab uas ua cua sov ntawm qhov kub. Hauv cov raj cua sov cua sov, nws yog lub luag haujlwm tseem ceeb ntawm kev kho qhov chaw nruab nrab ntawm cov xaim tsis kam, ua kom ntseeg tau tias lub plhaub hlau tsis raug them nyiaj (rwb thaiv tsev), thiab ua cov cua sov tawm los ntawm cov hlau tsis kam.
Raws li cov txheej txheem tsim khoom thiab lub hom phiaj tseem ceeb, nws tuaj yeem faib ua plaub pawg hauv qab no,
1. Hom Hom Cim Cim: P
2. Tsawg kub thiab noo noo-pov thawj hom Kev faib tawm: D
3. Nruab nrab qhov ntsuas kub nruab nrab cov dej noo-pov thawj hom Kev faib tawm: Z.
4. Hom kub kub Hom kev faib tawm: G
Kev ua tau zoo ntawm magnesium oxide hmoov:
1. Thaum MgO hmoov nyob ntawm qhov kub ua haujlwm, nws yuav tsum muaj cov cua sov ua kom siab, thiaj li hloov pauv cov cua sov mus rau saum lub raj, thiab ua kom cov hlau tsis kam nyob ze rau ntawm lub raj phab ntsa kub;
2. Thaum qhov kub ua haujlwm tsis pub dhau 1100 ℃, MgO hmoov yuav tsum muaj cov rwb thaiv tsev zoo;
3. MgO hmoov yuav tsum muaj qee yam ntawm cov granularity. Cov duab yog feem ntau puag ncig ntau dua li cov flakes tam sim no tsim hauv kuv lub tebchaws. Vim hais tias cov round hmoov muaj kev kub ceev, zoo fluidity, thiab ib tug tej yam feem pua ntawm cov hais, nws tsis yog ib qho yooj yim mus ntxiv hmoov puas cua kub hlau los xyuas kom meej tias cov hmoov yuav tau sau tsis muaj teeb meem;
4. MgO hmoov yuav tsum tsis xeb cov khoom siv cua sov thiab cov kav dej ntawm chav sov lossis kub.
5. Cov dej nqus dej ntawm cov tshuaj magnesium oxide hmoov yuav tsum tsis siab dua li cov cai hauv qab no:
(1), hom ib txwm ≤1.5%
(2), tsis kub thiab hom dej-pov thawj ≤0.05%
(3), nruab nrab qhov kub thiab txias hom proof0.10%
(4), hom kub siab ≤0.10%
Kev tiv thaiv ntawm magnesium oxide hmoov yuav tsum tsis qis dua tus nqi teev tseg hauv cov lus hauv qab no:
Kub: 600 700 800 875 900 975 1000 1100
Resistivity cm 5*109 1.5*109 3*108 8*107 5*107 1.4*107 1.0*107 3*106
Nco tseg:
1. Qhov ntsuas ntsuas ntsuas tau xaiv yog nyob nruab nrab ntawm cov ntsuas kub saum toj no, thiab qhov tiv thaiv tau txiav txim siab los ntawm kev hloov pauv ncaj qha,
2. Xaiv ob lub ntsiab lus T1 thiab T2 hauv qhov ntsuas kub ntau los ntawm T rho tawm 50 ℃ txog T ntxiv rau 100 ℃, thiab T2 rho tawm T1 yog sib npaug 100 ℃, siab kub magnesium oxide T2 yog sib npaug rau 975 ℃, thiab T1 yog sib npaug rau 875 ib. Kev ntsuas me me ntawm cov qib hluav taws xob qib magnesium oxide hmoov;
Tom qab cov hlau magnesia raug tsoo, qhov loj ntawm qhov me me sib txawv, yog tias muaj qee tus lej piv, nws muaj qhov zoo hauv qab no.
1. Nws tuaj yeem ua kom cov hmoov ntom ntom thiab txo qhov kub ua haujlwm ntawm cov hlau tsis kam, yog li ua kom lub neej muaj hluav taws xob ua kom sov lub neej;
2. Nws tuaj yeem kov yeej" sieving" nyhuv; txhim kho kev siv tus nqi ntawm MgO hmoov;
Raws li kev paub siv tiag tiag, Kuv tau sau cov ntaub ntawv hauv qab no, uas tam sim no muab rau koj siv:
Txoj kab uas hla 6.6 ~ 8.0 (hli) Txoj kab uas hla 8.5 ~ 12 (hli) Txoj kab uas hla 12 ~ 18 (hli)
Qhov loj me me (mesh) Cov ntsiab lus (% los ntawm qhov hnyav) Qhov loj me me (mesh) Cov ntsiab lus (% los ntawm qhov hnyav) Qhov me me (mesh) Cov ntsiab lus (% los ntawm qhov hnyav)
60~140 73.8 50~140 76.30 40~140 86
140~200 15.4 140~200 11 140~200 7.4
200~325 7.15 200~325 10 200~325 4.5
~325 3 ~325 2.4 ~325-
Kev tshuaj xyuas lub xeev ntawm magnesium oxide hmoov hauv qab cua sov:
Qhov porosity ntawm MgO hmoov nrawm hauv cov cua sov tubular yog 15% nyob rau hauv ib txwm muaj xwm txheej, uas yog, qhov ntom ntawm MgO hmoov lub sijhawm no yog: qhov tseeb ntom ntawm MgO hmoov rho tawm qhov porosity, uas yog, 3.85*( 1-15%)=3.05 G/cm3. Yog tias qhov kub ntawm lub cua sov ua kom txaus txaus thaum lub cua sov ua haujlwm, cov pa hauv qhov hws yuav cuam tshuam nrog cov xaim tsis kam thiab cov yeeb nkab. Vim yog qhov tshuaj tiv thaiv no, ib feem ntawm cov pa oxygen yuav raug txo kom tsawg. Lub xeev kawg ntawm ib feem ntawm cov pa oxygen txiav txim siab cov pa thiab cov hlau ntawm cov khoom. Kev sib raug zoo ntawm. Raws li cov ntaub ntawv, qee qhov pa oxygen yuav poob rau 10-13 ~ 10-19ata. Nyob rau hauv cov pa oxygen qis, qhov xwm txheej ntawm qhov sib xyaw zoo ntawm fused MgO hmoov hloov pauv, uas yog, cov hmoov MgO feem ntau hloov dub. Nyob rau hauv cov xwm txheej oxidizing, MgO hmoov feem ntau evaporates hauv daim ntawv molecular thiab tsis decompose ntawm qhov kub siab. MgO hmoov tuaj yeem txo qis ib nrab. MgO yog decomposed raws li hauv qab no:
MgO khoom ≒ Mg+1/2 O
Raws li cov ntaub ntawv: lub decomposition siab ntawm magnesium oxide hmoov ntawm qhov kub sib txawv tuaj yeem suav los ntawm cov qauv hauv qab no:
10logP =-(A*104)/T {{3}} BlogT {{4}} C*10-3+D*10-5 T-2+E
Qhov twg P: decomposition siab (tus nqi); T: kub, 0 K (thaj tsam 9320K ~ 13930K);
A=2.6061; B=0.2680; C=-0.62578; D=0.0932; E=7.3377.
Tom qab hloov cov ntaub ntawv, nws tau suav:
Thaum T1=9230K (650 ℃), ces P1=4.68016*10-21
Thaum T2=10730K (800 ℃), ces P2=3.92101*10-17
Thaum T3=11730K (900 ℃), ces P3=4.43868*10-15
Thaum T4=12230K (950 ℃), ces P4=3.52367*10-14
Thaum T5=12730K (1000 ℃), ces P5=2.37276*10-13
Nws tuaj yeem pom tias thaum lub siab hauv cov cua sov tau nqis los ntawm 10-19 ~ 10-13 ata ntawm 800 ~ 1000 ℃, MgO muaj cov xwm txheej rau kev ua kom rov zoo dua qub. Tsuas yog los ntawm kev ntxiv" txo cov cua", cov xwm txheej tsim nyog rau kev txo qis thiab kev sib cais ntawm MgO txaus, yog li MgO hmoov pib tig dub. Yog tias thaj chaw hla ntu ntawm cov cua sov tau cuam tshuam, kev rwb thaiv tsev ntawm cov cua sov yuav txo qis thiab tsis zoo. Vim li ntawd, cov dej xau tam sim no nce ntxiv. Qee qhov chaw kuj ntseeg tias qhov tshuaj tiv thaiv no thim rov qab. Yog tias ua kom cua huv ntawm 900 ° C, cov khoom qub ntawm cov hmoov yuav rov qab los.
Cov teeb meem dab tsi yuav tsum tau them nyiaj mloog rau hauv kev siv hluav taws xob qib magnesium oxide hmoov?
1. Rau cov khoom siv hlau tsis huv nrog lub raj ntev (xws li 4-6 meters), lawv yuav tsum tau muab tshuaj txhuam kom sov ntawm qhov kub siab txog 900 ° C ua ntej khoov. Hauv qhov no, cov xaim tsis kam yuav tsum tau ua los ntawm cov xaim xaim xaim xaim-xaim xaim hlau ntau li ntau tau. Vim tias txhuas (Al) tshwj xeeb tshaj yog yooj yim kom tshem tawm cov pa oxygen hauv MgO hmoov ntawm 900 ℃ (txhuas thiab cov pa muaj qhov sib raug zoo), qhov tshwm sim yog ib nrab txo ntawm magnesium oxide, uas yog, MgO hloov pauv ntawm magnesium, uas yuav ua MgO hmoov dub. Tau kawg, npib tsib xee yog siv. Chromium xaim zoo dua, vim tias kev sib raug zoo ntawm chromium thiab oxygen yog me me, thiab kev sib xyaw ntawm npib tsib xee thiab oxygen kuj tseem me me, yog li MgO hmoov yuav tsum tau txo, uas yog, txo qhov kub kom ntau dua.
2. Ua kom lub zog ntom ntom ntom ntom ntawm MgO tuaj yeem txo qhov kub ua haujlwm ntawm cov hlau tsis kam, tab sis nws tsis muaj qab hau rau kev xeb (xa mus rau cov hlau tsis muaj steel 900 ℃) rau kev siv hluav taws xob, vim tias yav dhau los muaj qhov kub thiab txias, thiab tom kawg muaj qhov kub ntawm ntau lub ntsiab lus sib npaug.
3. Txo qhov tuab ntawm txheej txheej insulating ntawm MgO hmoov kuj tseem tuaj yeem txo qhov kub ua haujlwm ntawm MgO hmoov thiab ua kom lub neej sov ntawm lub raj cua sov.
4. Tiv thaiv kev tsim cov organic teeb meem thiab xeb me ntsis ntawm phab ntsa sab hauv ntawm cov yeeb nkab. Yog li ntawd, cov yeeb nkab, tshwj xeeb yog cov yeeb nkab hlau, yuav tsum tau khaws thiab qhuav kom so cov xeb. Tom qab cov txheej txheem tiav, cov yeeb nkab tau ntim nrog cov hmoov sai thiab yuav tsum tsis txhob nyob ntev ntev. Tshwj xeeb tshaj yog nyob rau lub caij sov kom tsis txhob xeb.
5. Txij li MgO hmoov nws tus kheej muaj cov organic teeb meem uas yuav ua rau cov hmoov magnesium tig dub, nws tau pom zoo kom ci cov hmoov MgO siv ua ntej sau cov hmoov.
Peb ceeb toom rau cov neeg siv khoom ntau dua: MgO hmoov lossis thaiv yuav tsum tsis txhob raug rau lub hnub thiab dej nag thaum tsaus ntuj, thiab yuav tsum tsis txhob los nag hauv qhov cua qhib kom tiv thaiv cov kua qaub los nag thiab cov pa phem los ntawm kev nkag mus rau hauv qhov thaiv thiab hmoov. Qhov zoo ntawm cov hmoov magnesium txiav txim siab ib qho ntawm qhov zoo tshaj plaws ntawm cov cua kub cua sov
