Thermal conductivity ntawmceramic fiber boardyog qhov sib npaug ntawm peb qhov kev hloov hluav taws xob ntawm kev hloov hluav taws xob hloov pauv hauv cov khoom siv fiber ntau thiab cov fiber ntau sib cuag hauv cov ceramic fiberboard, huab cua convection hloov pauv hauv qhov pores, thiab hluav taws xob hloov hluav taws xob ntawm cov phab ntsa pore uas muaj cov khoom fibers, thiab lwm yam. , yog li nws tseem hu ua sib npaug thermal conductivity lossis pom meej thermal conductivity. Cov hauv qab no yog ib qho kev ntsuam xyuas luv luv ntawm cov saum toj no 8 yam uas cuam tshuam rau thermal conductivity ntawm ceramic fiber board.
1. Siv qhov kub thiab txias
Feem ntau, thermal conductivity ntawm ceramic fiberboard nce nrog nce kub. Yog vim li cas yog tias cov hluav taws xob hluav taws xob hloov hluav taws xob ntawm cov phab ntsa pore, qhov hluav taws xob hloov pauv ntawm huab cua hauv qhov pores, thiab cov cua sov hauv cov khoom siv fiber ntau thiab cov fiber ntau sib cuag txhua qhov sib npaug vim qhov nce hauv qhov kub thiab txias. ntawm cov roj thiab cov khoom molecules. Thaum qhov kub nce mus txog 800 degree, cov ceramic fiberboard feem ntau yog hluav taws xob hloov hluav taws xob, thiab qhov kub siab dua, qhov ntau dua qhov sib faib ntawm cov hluav taws xob hloov hluav taws xob.
2. Porosity thiab pore qauv thiab cov khoom
Porosity yog hais txog qhov sib piv ntawm qhov pore ntim hauv ceramic fiber board rau tag nrho cov ntim ntawm ceramic fiberboard, qhia raws li feem pua. Lub qhov hws ntawm lub rooj tsavxwm ceramic yog ntim nrog cua, thiab thermal conductivity ntawm huab cua nyob rau hauv chav tsev kub tsuas yog 0.025w/(mk), uas yog qis dua qhov conduction tshav kub hloov ntawm cov ceramic fiber ntau. Ceramic fiber phaj yog cov qauv sib xyaw ua ke ntawm cov khoom siv fiber ntau thiab cua, nrog rau qhov porosity ntau dua 80%. Ib tug loj npaum li cas ntawm cov thermal conductivity cua yog sau nyob rau hauv lub pores, rhuav tshem lub nruam network qauv ntawm cov khoom molecules, yog li tau txais zoo heev rwb thaiv tsev kev ua tau zoo. Cov kev soj ntsuam saum toj no qhia tau hais tias cov thermal rwb thaiv tsev thiab lub zog txuag kev ua haujlwm ntawm cov ntawv ceramic fiber ntau yog siv cov rwb thaiv tsev ntawm huab cua hauv qhov pores.
Cov qauv pore thiab cov khoom siv feem ntau cuam tshuam rau cov cua kub hloov pauv ntawm huab cua hauv ceramic fiberboard. Qhov loj dua qhov pore txoj kab uas hla, qhov me dua qhov sib thooj ntim ntom ntom ntawm ceramic fiberboard, thiab qhov loj dua cov cua kub hloov pauv ntawm huab cua hauv qhov pores, thiab qhov loj dua qhov cuam tshuam ntawm thermal conductivity nqi ntawm ceramic fiber board nrog qhov nce ntawm kub. Lub pores nyob rau hauv ceramic fiberboard muaj peb hom: nruam pores (qhib), semi-nruab pores (qhib thiab kaw) thiab cais pores (kaw). Lub thermal conductivity ntawm cov pore cais (kaw) qauv yog qhov tsawg tshaj plaws.
3. Ntim ceev
① Cov thermal conductivity ntawm ceramic fiber txo qis nrog qhov nce ntawm qhov ntom, tab sis qhov txo qis qis, yog li thaum qhov ntom ntom ntau dhau ntawm qee qhov, cov thermal conductivity tsis txo qis thiab nce ntxiv.
② Ntawm qhov sib txawv ntawm qhov kub thiab txias, muaj qhov tsawg kawg nkaus thermal conductivity thiab tus nqi tsawg kawg nkaus. Qhov ceev sib xws rau qhov tsawg kawg nkaus thermal conductivity nce nrog qhov nce ntawm qhov kub thiab txias.
4. Slag pob cov ntsiab lus
Slag npas yog kheej kheej hais tias tsis tuaj yeem fiberized nyob rau hauv high-temperature molten kua thaum lub sij hawm fiberization txheej txheem. Slag pob cov ntsiab lus hais txog qhov feem pua ntawm cov teeb meem tsis muaj fiber ntau hauv cov khoom siv hluav taws xob refractory ceramic thiab cov khoom tom qab dhau los ntawm 75-micron standard sieve qhov, thiab cov sieve residue account rau tag nrho cov qauv. Raws li cov ntsiab lus ntawm cov pob slag nce, tus nqi ntawm cov khoom fibers yuav txo qis, thiab qhov ceev ntawm cov fibers lawv tus kheej yuav txo. Yog li ntawd, cov thermal conductivity ntawm cov khoom fiber ntau yuav nce, thermal rwb thaiv tsev kev ua tau zoo ntawm cov khoom fiber ntau yuav deteriorate, thiab lub zog thiab elasticity ntawm fiber ntau yuav txo. Cov nyhuv ntawm slag pob cov ntsiab lus ntawm thermal conductivity ntawm cov khoom fiber ntau nce nrog nce kub.
5. Fiber txoj kab uas hla
Thaum qhov ntom ntawm ceramic fiber board zoo ib yam, qhov zoo ntawm fiber ntau txoj kab uas hla, qhov me me ntawm qhov pore loj, thiab qhov loj dua qhov damping nyhuv ntawm tshav kub hloov; Qhov thib ob, qhov zoo dua ntawm cov fiber ntau thiab qhov ntev ntawm tag nrho cov fiber ntau ntev, qhov ntau dua qhov damping ntawm tshav kub conduction, yog li thermal conductivity txo. Ntawm qhov tod tes, qhov zoo dua ntawm txoj kab uas hla ntawm ceramic fibers, qhov ntau dua qhov shrinkage ntawm cov cua sov kab ntawm cov khoom, thiab qhov qis dua qhov ntsuas kub tsis kam. Txhawm rau kom tau txais kev ua haujlwm zoo tshaj plaws, cov fiber ntau yuav tsum muaj qhov tsim nyog (inch), feem ntau 2 txog 4 microns.
6. Fiber av noo
Lub thermal conductivity ntawm dej ntawm {{0}} degree yog 0.522w/(mk), uas yog ntau tshaj 20 npaug tshaj qhov thermal conductivity ntawm huab cua nyob rau hauv tib yam kev mob ntawm 0.0247w/ (mk). Yog li ntawd, qhov nce ntawm cov av noo los yog cov ntsiab lus noo noo yuav inevitably nce thermal conductivity ntawm cov khoom fiber ntau. Piv txwv li, dej hauv lub qhov hws ntawm cov fiber ntau khov rau hauv dej khov, vim tias cov thermal conductivity ntawm cov dej khov nyob rau hauv tib yam kev mob yog 2.32w / (mk), uas yog ze rau 100 npaug ntawm thermal conductivity ntawm huab cua nyob rau hauv tib yam kev mob. Vim li no, rau cov kav dej rwb thaiv tsev, cov av noo ntawm cov khoom siv rwb thaiv tsev yuav tsum tau tswj xyuas cov ntsiab lus qis tshaj plaws, thiab tib lub sijhawm, yuav tsum muaj cov kev cai nruj heev ntawm cov ntaub ntawv tiv thaiv sab nrauv thiab cov qauv ntawm cov kav dej. xyuas kom cov thermal rwb thaiv tsev kev ua tau zoo ntawm fiber ntau rwb thaiv tsev qauv.
7. Siv qhov cua
Feem ntau, ceramic fiber boards yog siv nyob rau hauv atmospheric ib puag ncig, thiab cov roj nyob rau hauv lub pores yog huab cua. Yog li ntawd, lub luag haujlwm ntawm cov roj theem hauv cov khoom siv fiber ntau yog qhov ua tau zoo ntawm lub luag haujlwm thermal rwb thaiv tsev ntawm huab cua. Txawm li cas los xij, qee zaum, cov khoom siv fiber ntau ceramic yog siv nyob rau hauv lub tshuab nqus tsev, tiv thaiv huab cua lossis ntau yam xwm txheej uas yuav tsum tau tswj cov huab cua, xws li siv cov huab cua xws li hydrogen, carbon monoxide, carbon dioxide, hydrocarbons thiab inert gases. Lub sijhawm no, tus nqi thermal conductivity ntawm ceramic fibers hloov. Lub thermal conductivity ntawm ib tug roj muaj feem xyuam rau cov muaj pes tsawg leeg thiab cov qauv ntawm cov roj. Feem ntau hais lus, qhov me me ntawm qhov hnyav molecular ntawm cov pa thiab cov qauv yooj yim dua, nws qhov thermal conductivity ntau dua.
8. Fiber kev taw qhia
Thaum cov khoom thiab ntim ntom ntom zoo ib yam, cov thermal conductivity thaum tshav kub kev taw qhia yog perpendicular mus rau fiber ntau tsawg dua thermal conductivity thaum tshav kub kev taw qhia yog parallel rau fiber. Feem ntau, cov kev taw qhia ntawm cov cua sov ntawm cov txheej txheej yog nyob ze rau perpendicular mus rau cov kev taw qhia fiber ntau, thiab thermal conductivity ntawm cov khoom fiber ntau yog me me; thaum lub tshav kub khiav kev taw qhia ntawm cov txheej txheem stacked nyob ze rau thaum uas tig mus rau lub fiber kev taw qhia, thiab thermal conductivity ntawm fiber ntau cov khoom yog loj. Raws li tib cov kev mob ntawm cov khoom siv thiab ntim ntom ntom, lub thermal conductivity ntawm pawg pawg fiber ntau cov khoom lag luam fiber ntau cov khoom lag luam.
