Kev soj ntsuam ntawm lub xeev ntawm magnesium oxide hmoov nyob rau hauv cua sov:

Kev soj ntsuam ntawm lub xeev ntawm magnesium oxide hmoov nyob rau hauv cua sov:

Lub porosity ntawm MgO hmoov compressed nyob rau hauv lub tubular hluav taws xob cua sov lub caij yog ib txwm 15%, uas txhais tau hais tias qhov ceev ntawm MgO hmoov yog: qhov tseeb ceev ntawm MgO hmoov rho tawm lub porosity, uas yog 3.85 * (1-15%){ {4}}.05 g/cm3. Yog hais tias qhov kub ntawm cov hluav taws xob cua sov lub caij yog txaus siab thaum lub sij hawm ua hauj lwm, cov pa oxygen nyob rau hauv lub pore reacts nrog cov kuj hlau thiab cov khoom siv yeeb nkab. Vim yog cov tshuaj tiv thaiv no, ib nrab oxygen siab txo qis, thiab qhov kawg ntawm ib nrab oxygen siab txiav txim siab qhov kev sib raug zoo ntawm cov pa oxygen thiab cov hlau ntawm cov khoom. Raws li cov ntaub ntawv, qee qhov oxygen siab tuaj yeem txo mus rau 10-13-19ata. Ntawm qhov tsis tshua muaj oxygen siab, cov khoom ntawm cov khoom zoo ntawm fused MgO hmoov hloov, uas feem ntau hu ua blackening ntawm MgO hmoov. Nyob rau hauv oxidation tej yam kev mob, MgO hmoov feem ntau evaporates nyob rau hauv molecular daim ntawv ntawm siab kub yam tsis muaj decomposition, thiab tej zaum yuav raug txo ib feem nyob rau hauv txo tej yam kev mob. MgO yog decomposed raws li nram no:

MgO khoom ≈ Mg+1/2 O

Raws li cov ntaub ntawv, qhov decomposition siab ntawm magnesium oxide hmoov ntawm qhov sib txawv ntawm qhov kub thiab txias tuaj yeem suav nrog kev sib npaug hauv qab no:

10logP=- (A * 104)/T+BlogT+C * 10-3+D * 10-5 T-2+E

Hauv cov mis, P: decomposition siab (raws li tus nqi); T: Kub, 0 K (ntau 9320K ~ 13930K);

A=2.6061; B=0.2680; C=-0.62578; D=0.0932; E=7.3377.

Tom qab hloov cov ntaub ntawv, nws yog xam tias:

Thaum T1=9230K (650 degree), ces P1=4.68016 * 10-21

Thaum T2=10730K (800 degree), ces P2=3.92101 * 10-17

Thaum T3=11730K (900 degree), ces P3=4.43868 * 10-15

Thaum T4=12230K (950 degree), ces P4=3.52367 * 10-14

Thaum T5=12730K (1000 degree), ces P5=2.37276 * 10-13

Los ntawm qhov no, nws tuaj yeem pom tau tias thaum lub siab nyob rau hauv hluav taws xob cua sov lub caij poob los ntawm 10-19-10-13 ata ntawm 800-1000 degree, MgO muaj cov xwm txheej rau kev txo qis thiab decomposition. Tsuas yog los ntawm kev ntxiv lwm "txo cua" tuaj yeem MgO txo qis thiab decomposed, thiab cov xwm txheej tsim nyog tau ua tiav. Yog li ntawd, MgO hmoov pib blacken. Yog tias qhov chaw hla ntu ntawm cov khoom cua sov raug cuam tshuam, nws yuav ua rau cov rwb thaiv tsev ntawm cov cua sov kom txo qis thiab deteriorate, uas ua rau muaj kev nce hauv cov dej ntws tawm. Qee cov ntaub ntawv kuj qhia tias qhov tshuaj tiv thaiv no thim rov qab. Yog tias annealed hauv huab cua ntawm 900 degree, cov khoom qub ntawm cov hmoov yuav rov qab los.

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