Kev piav qhia ntawm lub tswvyim ntawm thermal expansion thiab contraction
Thermal expansion thiab contraction yog hais txog cov khoom uas ib yam khoom nthuav thaum cua sov thiab cog lus thaum txias. Txij li thaum cov lus tsa suab ntawm cov khoom (atoms) nyob rau hauv ib qho khoom hloov nrog qhov kub thiab txias, thaum kub nce, qhov kev vibration amplitude ntawm cov khoom nce, ua rau cov khoom nthuav; tab sis thaum qhov kub thiab txias poob, qhov kev vibration amplitude ntawm cov khoom txo qis, ua rau cov khoom me me.
01 Ceramic fiber tsis nthuav thaum rhuab
Ntau yam khoom nyob rau hauv qhov muaj cov khoom ntawm thermal expansion thiab contraction, tab sis ceramic fibers yuav tsis nthuav tom qab rhuab, tab sis kuj muaj ib tug shrinkage tus nqi ntawm 0.03. Yog vim li cas yog muab los ntawm cov yam ntxwv ntawm cov ceramic fiber nws tus kheej.
Lub microstructure ntawm ceramic fiber yog cov qauv sib xyaw ua ke ntawm cov khoom siv fiber ntau thiab cua, thiab nws cov microstructure yog tus cwj pwm nyob rau hauv tias ob qho tib si theem thiab roj theem muaj nyob rau hauv daim ntawv txuas mus ntxiv. Nyob rau hauv cov qauv no, cov khoom muaj nyob rau hauv daim ntawv ntawm fibers nrog ib txoj kab uas hla ntawm 2 ~ 5um thiab ib tug ntev ntawm 30 ~ 250mm, thiab ua ib tug nruam pob txha pob txha, thaum lub roj theem muaj nyob rau hauv tsis tu ncua nyob rau hauv lub skeleton kis ntawm cov khoom fiber, thiab cov porosity ntau dua 90 feem pua.
Yog li ntawd, kev nthuav dav ntawm cov ceramic fiber tom qab cua sov yuav muab tais los ntawm nws tus kheej qhov hws, thiab nws yuav tsis pom tseeb heev. Qhov no yog vim li cas vim li cas cov khoom siv fiber ntau ceramic tsis nthuav thaum rhuab.
02 Anti-shrinkage ntawm ceramic fiber thaum ua haujlwm kub
Nyob rau hauv daim ntawv thov txheej txheem ntawm ceramic fiber khoom nyob rau hauv kub kub rauv, vim nyob rau hauv lub sij hawm ntev ntawm kub kub ib puag ncig, lub fiber filaments uas muaj li ntawm cov pob txha pob txha yog tawg vim tuag yuag los yog brittleness, uas ua rau cov pob txha tawg, fiber ntau filaments aggregation, thiab txo. qhov chaw tsis muaj chaw. Yog li ntawd, los ntawm cov tsos ntawm cov khoom siv fiber ntau ceramic, yuav muaj qee qhov shrinkage, shrinkage tus nqi feem ntau tsawg dua 0.03.
Daim ntawv thov tswv yim
a. Kev xaiv ntawm ceramics fibers yuav tsum ua raws li lub hauv paus ntsiab lus ntawm siab refractory kub, thiab txo cov linear shrinkage ntawm ceramic fibers ntau li ntau tau;
b. Ceramic fiber daim pam thaiv qauv yuav tsum tau nyem thiab compacted kom ntau li ntau tau thaum lub sij hawm tsim kho txheej txheem los tiv thaiv kub shrinkage los ntawm ua rau lub qhov khoob ntawm lub cub tawg hauv ob sab phlu thiab puas rau lub cub tawg lub cev;
c. Thaum xaiv ceramic fiber module rauv hauv ob sab phlu, nws raug nquahu kom muaj qee yam ntawm cov paj rwb fiber ntau cov pam vov rau txhaws qhov khoob nyob rau theem tom ntej.