Tus yuam sij rau qhov sib txawv ntawm qhov tsis tiav sintering thiab sealing tsis ua haujlwm yog nyob rau hauv kev sib txuas ntawm metallographic tsom xam thiab kev ntsuas dej noo: metallographic tsom tsis pom tias tsis muaj recrystallization qhia tias tsis tiav sintering, thaum muaj kev poob qis hauv rwb thaiv tsev tiv thaiv tom qab ntsuas dej noo rau kev sib khi tsis ua haujlwm.
1. Metallographic Analysis – Tus "Gold Standard" rau Judging Sintering Status
Cov tsos mob ntawm Incomplete Sintering:
Magnesium oxide nplej yog me me thiab xoob, zoo li cov hmoov nyoos;
Tsis pom tseeb lis ciam teb los yog recrystallized lug;
Ntau lub micropores thiab qhov cuam tshuam tsis tu ncua yog pom nyob rau hauv lub tshuab tsom.
Cov tsos mob ntawm sintering zoo:
Grains are significantly grown and densely arranged, forming a continuous ceramization structure;
Sintering kub yuav tsum ncav cuag 800-1000 degree, nrog lub sij hawm tuav ntau tshaj los yog sib npaug rau 1 teev.
Yog hais tias qhov kev ntsuam xyuas metallographic qhia tias tsis muaj recrystallization, txawm tias lub foob tsis zoo, lub rwb thaiv tsev yuav txo qis ntawm qhov kub thiab txias vim qhov nthuav dav ntawm micropores.
2. Kev Ntsuas Dej - Ib txoj hauv kev tseem ceeb rau kev txheeb xyuas qhov ua tau zoo sealing
Txoj Kev Xeem: Tom qab muab cov qauv tso rau hauv ib puag ncig ntawm 40℃thiab 95% RH rau 48 teev, ntsuas qhov txias - lub xeev rwb thaiv tsev tsis kam.
Cov tsos mob ntawm Sealing Failure:
Initial rwb thaiv tsev Resistance Ntau dua los yog sib npaug rau 500 MΩ, poob rau<200 MΩ after moisture exposure; This indicates that moisture has seeped into the interior through sealing defects.
Cov qauv rau kev sealing zoo:
Rwb thaiv tsev kuj tseem ntau dua los yog sib npaug li 200 MΩ tom qab ya raws, tsis muaj qhov hws los yog corrosion.
Yog tias qhov ntsuas dej tsis zoo tab sis cov qauv metallographic yog qhov qub, nws qhia tau hais tias zoo sintering tab sis tsis txaus sealing, ib rooj plaub ntawm "kev noj qab haus huv, kis tau tus kab mob."
3. Daim Ntawv Txiav Txim Siab Zoo
Cov khoom kuaj: Tsis tiav sintering; sealing tsis ua hauj lwm; Ob leeg ua ke
Metallographic Analysis: Cov nplej tsis recrystallized; Ib txwm; Qhov txawv txav
Kev Ntsuas Dampness: Muaj peev xwm dhau tau (yog tias kaw zoo); Ua tsis tiav; Ua tsis tiav
X-Ray Inspection: Voids tej zaum yuav pom (tsis sib npaug); Micropores / tawg nyob rau hauv qhov chaw sealing; Ob leeg tam sim no
Kub Test Performance: Passable nyob rau hauv lub xeev txias, cia li poob rau hauv lub xeev kub; Passable nyob rau hauv lub xeev txias, tsis kam mus txog 0 nyob rau hauv lub xeev kub; Kev puas tsuaj loj heev
Cov yam ntxwv zoo:
Ua tsis tiav sintering nkaus xwb: Passable nyob rau hauv lub xeev txias, tsis kam poob rau hauv lub xeev kub, tab sis tseem dhau dampness xeem;
Sealing tsis ua hauj lwm nkaus xwb: Ib txwm metallographic qauv, tab sis kuj poob sharply tom qab dampness kuaj;
Ob leeg sib koom ua ke: Txhua qhov kev xeem ua tsis tiav, nyuaj tshaj plaws hauv kev rov ua haujlwm dua.
