Qhov tshwj xeeb ntawm ceramic rhaub hlau porcelain kho
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Qhov tshwj xeeb ntawm ceramic rhaub hlau porcelain kho
(1) Kev nthuav dav thiab kev cog lus ntawm cov hlau thiab cov plooj (porcelain): cov hlau thiab cov plooj (porcelain) sib xyaw ua ke ntawm qhov kub thiab txias, yog tias qhov txias txias ntawm txhua ntu ntawm qhov kub thiab txias mus rau chav kub sib txawv, cov plooj (porcelain) yuav tawg, poob tawm. Tau kawg, qhov shrinkage ntawm ob tsis tuaj yeem ua tib yam nkaus. Feem ntau, cov hlau yog me ntsis loj dua cov ceramic, thiab qhov sib txawv yuav tsum tsis pub dhau 1.08 × 10-6 / degree. Yog li ntawd, yuav tsum muaj kev xaiv rau cov hlau thiab cov plooj (porcelain) hmoov, thiab tsis muaj cov hlau nplaum tuaj yeem phim cov porcelain hmoov. Feem ntau, cov hmoov hlau thiab cov plooj (porcelain) uas tsim los ntawm tib lub chaw tsim khoom muaj qhov sib tw zoo. Tsis tas li ntawd, ntau yam sintering tuaj yeem ua rau cov ntsiab lus ntawm garnet muaju nyob rau hauv cov ceramic thiab ua kom cov thermal expansion coefficient, yog li mismatching thermal expansion coefficient ntawm kub porcelain.
(2) Thaum tshav kub kub ntawm cov hlau thiab cov plooj (porcelain): Txij li cov plooj (porcelain) yuav nkag mus thaum lub sij hawm kub kub sintering, tib cov hlau yuav mos ntawm qhov kub thiab txias thiab yooj yim deformed los ntawm creep. Yog li ntawd, lub melting point ntawm hlau yuav tsum siab tshaj qhov kub ntawm sintering porcelain. 150 ~ 260 degree. Rau cov alloys nrog ib tug qis melting point, lub thickness yuav tsum tau nce los tiv thaiv creep ntawm porcelain.
(3) Hlau nto wettability: Porcelain yog kua nyob rau hauv kub sintering, thiab wettability ntawm cov khoom hlau nto, uas yog, lub kaum sab xis ntawm ob yuav tsum me me. Cov yam ntxwv uas cuam tshuam rau lub wettability yog nyob ntawm qhov nro ntawm cov khoom, lub xeev ntawm cov kua, viscosity ntawm ceramic thiab roughness thiab huv si ntawm cov hlau nto. Qhov nro ntawm cov khoom thiab cov viscosity ntawm cov ceramic yog tas li. Nyob rau hauv tus txheej txheem ntawm ua cov porcelain crown thiab choj, nws yuav tsum tau muab sau tseg tias saum npoo ntawm cov hlau substrate yuav tsum tsis txhob yuav ntxhib heev. Cov hlau yas yog qhov zoo tshaj plaws kho nrog high-concentration ethanol, acetone los yog 30 feem pua hydrochloric acid thiab ultrasonically ntxuav rau 15 feeb ua ntej ntxiv cov plooj (porcelain), uas tuaj yeem ua rau kom muaj kev sib xyaw ntawm cov plooj (porcelain kub) thiab txo cov npuas sintering.
Cov yam ntxwv ntawm ceramic rhaub porcelain
Nws yog ib txoj hauv kev ntxiv dag zog rau cov ceramics los ntawm kev tua cov ceramics ntawm cov hlau nto thiab siv lub zog ntawm cov hlau thaum tuav cov kev zoo nkauj thiab cov yas ntawm cov ceramic. Txawm li cas los xij, cov txiaj ntsig ntawm qhov kev ntsuas kev txhawb zog no kuj txwv, thiab nws feem ntau yog nyob ntawm lub zog sib txuas ntawm cov plooj (porcelain kub).
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