Nyob rau hauv xyoo tas los no, thermal conductivity ntawm cov khoom siv roj hmab tau txais kev saib xyuas dav.Cov khoom siv roj hmab thermal yog siv dav hauv kev lag luam aerospace, aviation, electronics, thiab cov khoom siv hluav taws xob los ua lub luag haujlwm hauv kev ua kom sov, rwb thaiv tsev thiab kev poob siab.Kev txhim kho ntawm thermal conductivity yog qhov tseem ceeb heev rau cov khoom siv roj hmab thermally.Cov roj hmab muaj cov roj hmab muaj txiaj ntsig tau npaj los ntawm cov khoom siv hluav taws xob, uas yog qhov tseem ceeb ntawm kev txhim kho ntawm lawv txoj kev ntseeg tau thiab kev ncua ntawm lawv lub neej kev pabcuam.
Tam sim no, cov khoom siv roj hmab siv hauv cov log tsheb yuav tsum muaj cov yam ntxwv ntawm kev tsim hluav taws xob tsawg thiab thermal conductivity.Ntawm qhov tod tes, nyob rau hauv cov txheej txheem vulcanization ntawm lub log tsheb, qhov kev hloov pauv ntawm cov roj hmab tau txhim kho, tus nqi vulcanization tau nce, thiab kev siv lub zog txo;Cov cua sov tsim tawm thaum tsav tsheb txo qhov kub ntawm lub cev thiab txo cov log tsheb kev ua haujlwm degradation los ntawm qhov kub thiab txias.Lub thermal conductivity ntawm thermally conductive roj hmab yog tsuas yog txiav txim los ntawm cov roj hmab matrix thiab thermally conductive muab tub lim.Lub thermal conductivity ntawm ob qhov hais los yog fiber ntau thermal conductive muab tub lim yog zoo dua li ntawm cov roj hmab matrix.
Feem ntau siv thermally conductive fillers yog cov ntaub ntawv hauv qab no:
1. Cubic Beta theem nano silicon carbide (SiC)
Nano-scale silicon carbide hmoov cov ntaub ntawv hu rau cov hluav taws xob conduction chains, thiab yog yooj yim dua rau ceg nrog polymers, tsim Si-O-Si saw kub conduction skeleton raws li lub ntsiab tshav kub conduction txoj kev, uas zoo heev txhim kho cov thermal conductivity ntawm cov khoom sib xyaw yam tsis muaj kev txo qis. Cov khoom siv sib xyaw Cov khoom siv kho tshuab.
Lub thermal conductivity ntawm silicon carbide epoxy composite khoom nce nrog nce ntawm silicon carbide, thiab nano-silicon carbide tuaj yeem muab cov khoom sib xyaw zoo thermal conductivity thaum tus nqi qis.Lub zog flexural thiab cuam tshuam lub zog ntawm silicon carbide epoxy composite cov ntaub ntawv nce ua ntej thiab tom qab ntawd txo qis nrog qhov nce ntawm cov nyiaj ntawm silicon carbide.Kev hloov kho saum npoo ntawm silicon carbide tuaj yeem txhim kho cov thermal conductivity thiab txhua yam khoom ntawm cov khoom sib xyaw.
Silicon carbide muaj cov khoom siv ruaj khov, nws cov thermal conductivity zoo dua li lwm cov khoom siv semiconductor, thiab nws cov thermal conductivity tseem ntau dua li cov hlau ntawm chav tsev kub.Cov kws tshawb fawb los ntawm Beijing University of Chemical Technology tau tshawb fawb txog cov thermal conductivity ntawm alumina thiab silicon carbide reinforced silicone roj hmab.Cov txiaj ntsig tau pom tias cov thermal conductivity ntawm silicone roj hmab nce raws li cov nyiaj ntawm silicon carbide nce;Thaum tus nqi ntawm silicon carbide zoo ib yam, cov thermal conductivity ntawm cov me me me me silicon carbide reinforced silicone roj hmab yog ntau dua li ntawm qhov loj me me silicon carbide reinforced silicone roj hmab;Lub thermal conductivity ntawm silicon roj hmab ntxiv nrog silicon carbide zoo dua li ntawm alumina reinforced silicon roj hmab.Thaum qhov loj ntawm alumina / silicon carbide yog 8/2 thiab tag nrho cov nyiaj yog 600 qhov chaw, thermal conductivity ntawm silicon roj hmab yog qhov zoo tshaj plaws.
Aluminium nitride yog ib qho atomic crystal thiab belongs rau pob zeb diamond nitride.Nws tuaj yeem nyob ruaj khov ntawm qhov kub ntawm 2200 ℃.Nws muaj cov thermal conductivity zoo thiab tsis tshua muaj thermal expansion coefficient, ua rau nws zoo thermal shock khoom.Lub thermal conductivity ntawm txhuas nitride yog 320 W·(m·K)-1, uas yog ze rau lub thermal conductivity ntawm boron oxide thiab silicon carbide, thiab yog ntau tshaj li 5 npaug ntawm alumina.Cov kws tshawb fawb los ntawm Qingdao University of Science thiab Technology tau kawm txog thermal conductivity ntawm aluminium nitride reinforced EPDM roj hmab composites.Cov txiaj ntsig tau pom tias: raws li tus nqi ntawm aluminium nitride nce, thermal conductivity ntawm cov khoom sib xyaw nce;Lub thermal conductivity ntawm cov khoom sib xyaw uas tsis muaj txhuas nitride yog 0.26 W·(m·K)-1, thaum tus nqi ntawm txhuas nitride nce mus txog 80 qhov chaw, thermal conductivity ntawm cov khoom sib xyaw nce mus txog 0.442 W·(m·K) -1, nce 70%.
Alumina yog ib hom multifunctional inorganic muab tub lim, uas muaj thermal conductivity loj, dielectric tas li thiab zoo hnav tsis kam.Nws yog dav siv hauv cov khoom siv roj hmab sib xyaw.
Cov kws tshawb fawb los ntawm Beijing University of Chemical Technology tau sim cov thermal conductivity ntawm nano-alumina / carbon nanotube / natural rubber composites.Cov txiaj ntsig tau pom tias kev siv ua ke ntawm nano-alumina thiab carbon nanotubes muaj kev sib koom ua ke ntawm kev txhim kho cov thermal conductivity ntawm cov khoom sib xyaw;Thaum tus nqi ntawm cov pa roj carbon nanotubes tas mus li, cov thermal conductivity ntawm cov khoom sib xyaw nce linearly nrog qhov nce ntawm nano-alumina;Thaum 100 Thaum siv nano-alumina ua cov thermally conductive muab tub lim, cov thermal conductivity ntawm cov khoom sib xyaw nce 120%.Thaum 5 qhov chaw ntawm cov pa roj carbon nanotubes tau siv los ua cov khoom siv thermally conductive, cov thermal conductivity ntawm cov khoom sib xyaw nce los ntawm 23%.Thaum 100 qhov chaw ntawm alumina thiab 5 qhov chaw siv Thaum cov pa roj carbon nanotubes siv los ua cov khoom siv thermally conductive, cov thermal conductivity ntawm cov khoom sib xyaw nce 155%.Qhov kev sim kuj tau kos ob qhov kev txiav txim siab hauv qab no: Ua ntej, thaum tus nqi ntawm cov pa roj carbon nanotubes tsis tu ncua, raws li tus nqi ntawm nano-alumina nce, cov txheej txheem muab tub lim tsim los ntawm cov khoom siv muab tub lim hauv cov roj hmab maj mam nce, thiab qhov poob ntawm qhov cov khoom sib xyaw maj mam nce.Thaum 100 qhov chaw ntawm nano-alumina thiab 3 qhov chaw ntawm cov pa roj carbon nanotubes siv ua ke, lub zog compression cua sov tsim ntawm cov khoom sib xyaw tsuas yog 12 ℃, thiab cov khoom siv hluav taws xob zoo heev;Thib ob, thaum tus nqi ntawm cov pa roj carbon nanotubes raug kho, raws li tus nqi ntawm nano-alumina nce, Lub hardness thiab kua muag lub zog ntawm cov ntaub ntawv sib xyaw nce, thaum lub zog tensile thiab elongation ntawm tawg txo.
Cov pa roj carbon nanotubes muaj lub cev zoo heev, thermal conductivity thiab hluav taws xob conductivity, thiab yog qhov zoo tagnrho cov khoom siv ntxiv.Lawv cov khoom siv roj hmab sib txuas ntxiv tau txais kev saib xyuas dav.Cov pa roj carbon nanotubes yog tsim los ntawm curling txheej ntawm graphite nplooj ntawv.Lawv yog cov khoom siv graphite tshiab nrog cov qauv cylindrical nrog txoj kab uas hla ntawm kaum nanometers (10-30nm, 30-60nm, 60-100nm).Lub thermal conductivity ntawm carbon nanotubes yog 3000 W·(m·K)-1, uas yog 5 npaug ntawm thermal conductivity ntawm tooj liab.Cov pa roj carbon nanotubes tuaj yeem txhim kho cov thermal conductivity, hluav taws xob conductivity thiab lub cev ntawm cov roj hmab, thiab lawv qhov kev txhawb zog thiab thermal conductivity zoo dua li cov khoom siv xws li carbon dub, carbon fiber thiab iav fiber ntau.Cov kws tshawb fawb los ntawm Qingdao University of Science thiab Technology tau tshawb fawb txog thermal conductivity ntawm carbon nanotubes / EPDM cov ntaub ntawv sib xyaw.Cov txiaj ntsig tau pom tias: carbon nanotubes tuaj yeem txhim kho cov thermal conductivity thiab lub cev ntawm cov khoom sib xyaw;Raws li tus nqi ntawm cov pa roj carbon nanotubes nce, thermal conductivity ntawm cov ntaub ntawv sib xyaw nce, thiab lub zog tensile thiab elongation ntawm tawg ua ntej nce thiab tom qab ntawd txo qis, lub zog tensile thiab tearing zog yog nce;Thaum cov pa roj carbon nanotubes me me, qhov loj-inch carbon nanotubes yooj yim dua los tsim cov khoom siv hluav taws xob ntau dua li cov pa roj carbon nanotubes me me, thiab lawv zoo dua ua ke nrog cov roj hmab matrix.
Post lub sij hawm: Aug-30-2021