Dab tsi yog qhov zoo tshaj plaws ceev rau cov khoom siv fiber ntau ceramic?
Qhov kev ceev ntawm cov refractory tej hub nplej hais txog qhov sib piv ntawm qhov hnyav ntawm cov ceramic fibers rau tag nrho cov khoom. Txoj kev ceev ntom yog qhov ntsuas uas txiav txim siab seb puas xaiv ntawm cov cub hluav taws xob yog tsim nyog. Nws yog ib qho tseem ceeb uas cuam tshuam rau thermal conductivity:
a. Cov thermal conductivity ntawm cov khoom siv fiber ntau txo qis nrog qhov nce ntawm qhov ntom ntom, tab sis qhov ntau ntawm cov khoom yuav maj mam txo qis, yog li thaum qhov ntom ntom ntau dhau ntawm qee qhov, cov thermal conductivity tsis txo, tab sis nyhav nce.
b. Muaj tsawg kawg thermal conductivity thiab ib qho kev sib raug zoo tsawg kawg ntawm cov kub kub, thiab cov ntom ntom nti nrog qhov tsawg kawg thermal ua haujlwm nce nrog qhov ntsuas kub.
Kev nkag siab zoo thiab kev siv cov cai saum toj no yog qhov tseem ceeb rau kev siv cov ceramic fibers. Lub thermal rwb thaiv tsev kev ua tau zoo ntawm ceramic fibers yog tsuas yog raws li thermal rwb thaiv tsev nyhuv ntawm airtight huab cua nyob rau hauv lub pores ntawm cov khoom. Thaum qhov tshwj xeeb lub ntiajteb txawj nqus ntawm cov khoom fibers tsis tu ncua, qhov loj dua qhov porosity, qhov me me ntawm qhov ntom ntom.
Thaum cov bulk ntom tsawg dua 96Kg / m³, vim qhov txhim kho oscillating convection thiab hluav taws xob hloov hluav taws xob ntawm cov roj hauv cov qauv sib xyaw, cov thermal conductivity txo qis nrog cov khoom ntom ntom thiab nce exponentially.
Thaum lub ntom ntom ntom ntom ntau dua 96kg / m³, raws li qhov sib npaug ntawm cov kab mob tau kaw, cov cua ntws hauv cov fiber ntau hauv cov fiber ntau dua (thermal tsis kam nce), thiab tib lub sijhawm ua rau cov hluav taws xob hloov hluav taws xob los ntawm lub qhov phab ntsa kuj raug txo kom tsawg, yog li txo cov thermal conductivity.
Thaum cov khoom ntim ntau ntxiv mus rau ib qho ntawm 240 ~ 320Kg / m³, cov ntsiab lus fiber ntau sib cuag tau nce, yog li cov fiber ntau nws tus kheej tsim cov cim, thiab qhov kub hloov pauv hnyav nce los ntawm tus choj. Cov nyhuv damping tsis muaj zog, yog li ntawd cov thermal conductivity tsis txo qis thiab nyhav ntxiv. Yog li ntawd, cov khoom siv fiber ntau ntxeem tau muaj qhov zoo tshaj plaws qhov ntom ntom nrog qhov tsawg tshaj plaws thermal conductivity. Cov txheej txheem txawv teb chaws ceramic fiber phab ntsa hauv ob sab phlu, kub nto ceramic fiber ntau ntom yog teev raws li 130 ~ 160Kg / m³, thiab lub tiaj tus laminated composite rauv hauv ob sab phlu kub nto ceramic fiber ntim Qhov ceev yog teev raws li 200 ~ 240Kg / m³.
Tom qab qhov kub ntawm phab ntsa ntawm lub cub tawg, qhov ntom ntom ntawm txhua txheej ntawm cov khoom fiber ntau txo qis zuj zus, vim tias cov thermal conductivity ntawm ceramic fibers txo qis nrog qhov nce ntawm qhov ceev ntawm qhov kub thiab txias, uas yog qhov tseem ceeb tshaj qhov uas tsis tshua muaj kub. Kev siv cov txheej txheem fiber ntau nrog cov txheej txheem sib txawv hauv cov thickness kev taw qhia raws li qhov ceev tuaj yeem ua kom cov thermal tsis sib xws nyob rau hauv cov thickness kev taw qhia ntawm lub qhov cub hauv ob sab phlu. Nyob rau hauv tib lub thermal tsis kam, tus nqi ntawm fiber ntau tuaj yeem txuag tau thiab tus nqi ntawm cov khoom siv hluav taws xob tuaj yeem txo qis.
