(1). Yuav ua li cas qhov tseeb ceev ntawm carbon fiber nws pib qhov chaw hloov thaum lub sij hawm calcination? Qhov tseeb ceev ntawm carbon fiber nws pib qhov chaw nyob rau hauv tus txheej txheem ntawm calcination muaj ib tug linear kev sib raug zoo nrog lub calcination kub, uas yog, nws nce nrog lub calcination kub. Qhov tseeb qhov ceev ntawm ntau yam carbon fiber nws pib qhov chaw tom qab calcination tau zoo heev, piv txwv li, qhov tseeb ceev ntawm roj av coke tau nce los ntawm 1.36 ~ 1.62g / cm³ ua ntej calcination mus rau 2.04 ~ 2.12g / cm³ tom qab calcination, nce ntawm ntau tshaj 40 feem pua. Qhov nce ntawm qhov tseeb qhov ceev ntawm carbon fiber nws pib qhov chaw nyob rau hauv tus txheej txheem ntawm calcination yog feem ntau yog vim lub rearrangement thiab ntim shrinkage tshwm sim los ntawm kev khiav tawm tsis tu ncua ntawm volatiles ntawm kub kub thiab lub simultaneous pyrolysis thiab polycondensation cov tshuaj tiv thaiv. Feem ntau, nyob rau hauv tib lub calcination kub, qhov siab dua qhov tseeb ceev ntawm calcined carbon fiber nws pib qhov chaw, qhov yooj yim dua nws yog graphitize.
(2). Yuav ua li cas lub ntim shrinkage ntawm carbon fiber nws pib qhov chaw hloov nyob rau hauv tus txheej txheem ntawm calcination? Tag nrho cov pa roj carbon fiber ntau qhov chaw yuav maj mam poob rau hauv cov txheej txheem ntawm calcination, uas yog tshwm sim los ntawm cov qauv kev hloov pauv tshwm sim los ntawm kev tawm ntawm cov volatiles uas muaj nyob rau hauv cov ntaub ntawv raw thiab cov tshuaj tiv thaiv pyrolytic polycondensation, yog li kom densify lub block ntawm carbon fiber nws pib qhov chaw, yog li no zoo txhim kho qhov tseeb ceev thiab txhua yam muaj zog ntawm carbon fiber nws pib qhov chaw. Rau qeeb coke, lub ntim shrinkage loj dua ua ntej 700 degree vim qhov hnyav pyrolytic polycondensation cov tshuaj tiv thaiv. Nyob rau hauv qhov kub ntawm 700 ~ 1000 degree, lub ntim shrinkage tus nqi ntawm coke qeeb qeeb. Tom qab 1000 degree, cov qauv coke shrinks thiab tsim ntau microcracks, uas ncaj qha mus rau crushing phenomenon ntawm calcined carbon raw cov ntaub ntawv. Qhov ntim no shrinkage (densification) txuas ntxiv txawm tias thaum lub calcination kub nce mus txog 1200 ~ 1300 degree. Lub shrinkage degree ntawm carbon fiber nws pib qhov chaw yog ntau dua thaum lub volatile cov ntsiab lus yog loj thiab cov zis yog loj thaum lub sij hawm calcination. Lub ntim shrinkage ntawm qeeb coke thiab anthracite tom qab calcined yog nyob rau hauv thaj tsam ntawm 20 feem pua ~ 30 feem pua.
