Dab tsi yog qhov txiaj ntsig ntawm kev siv lub tshuab cua sov PTFE nrog Graphene -Txhim kho Thermal Interface?

Nyob rau hauv lub PTFE immersion rhaub, nichrome hlau yog insulated los ntawm cov kua los ntawm lub polymer sheath nws tus kheej, uas yog ib tug thermal insulator. Lub tshav kub tsis muaj sij hawm los diffuse tusyees raws cov hlau ua ntej nws mus rau ntawm phab ntsa. Qhov teeb meem tuaj yeem txo tau los ntawm kev ntxhib - txheej nyias ntawm graphene, cov khoom uas xa cov cua sov zoo dua li lwm yam, nruab nrab ntawm lub kauj thiab lub plhaub. Qhov kev tsim kho tshiab no, lub graphene thermal interface PTFE lub rhaub, daws qhov tsis zoo ntawm lub tshuab cua sov siv thiab muab kev ua haujlwm tau zoo.

Txheem PTFE rhaub Internal thermal bottleneck
Nyob rau hauv ib txwm PTFE lub rhaub cov hluav taws xob tiv thaiv kab hluav taws xob yog kos ncaj qha rau hauv PTFE los yog sib cais los ntawm qhov sib txawv ntawm cov cua luv luv cua yog qhov tsis zoo thermal conductor (txog 0.026 W / m·K) thiab txawm tias qhov sib txawv me me yuav ua rau thaj chaw kub kub thaum cov hlau kub nyob deb tshaj qhov nruab nrab uas tau txais. Txij li thaum PTFE nws tus kheej muaj cov thermal conductivity tsawg (kwv yees li 0.25 W / m·K), cua sov tsis tuaj yeem nkag mus rau sab hauv ntawm lub hnab. Qhov no ua rau cov hlau ua kom sov dua li nws yuav tsum muaj qee qhov watt ceev, ua kom cov hlau oxidation thiab PTFE aging.

Yuav Ua Li Cas Graphene Txhim Kho Qhov Chaw Thermal Interface
Thaum lub sij hawm tsim kho ntawm lub rhaub, lub internal kuj hlau coil yog qhwv nrog ib tug saj zawg zog siab - kub silicone ncoo loaded nrog graphene nanoplatelets. Cov graphene- txhim kho cov khoom siv thermal interface (TIM) tau muab tso rau ntawm lub kauj thiab sab hauv phab ntsa ntawm PTFE sheath. Lub pad ua ob yam tseem ceeb heev:

Filling microscopic air gapsThe compliant silicone adheres to the wire deg, tshem tawm cua ntxiab thiab tshem tawm thermal tiv thaiv.

Thaum tshav kub kub sib kis: Graphene muaj siab heev nyob rau hauv - dav hlau thermal conductivity (txog 5000 W / mK) uas tuaj yeem thauj cov cua sov tom qab ntawm txheej txheej sab nraud ntawm qhov kub tshaj plaws ntawm cov hlau.

Lub graphene ua haujlwm zoo li minuscule superhighway rau kev nthuav tawm cua sov rau hauv cov tub ntxhais ntawm lub rhaub. Cov chaw kub kub yog tsim los ntawm qhov sib txawv me me hauv cov hlau suab lossis cov watt ntom ntom hauv zos, thiab cov chaw kub kub no tau nthuav dav mus rau thaj tsam ntau dua ntawm phab ntsa sheath. Qhov no ua rau muaj qhov ntsuas kub ntau homogenous profile hauv.

Cov txiaj ntsig tseem ceeb ntawm Graphene Thermal Interface
1. Tsawg Hlau Kub ntawm Tib Wattage Ceev
Lub TIM muab cov cua sov hloov pauv ntau dua, yog li rau lub zog muab tso rau qhov siab tshaj plaws ntawm cov nichrome hlau yog qis dua. Cov xaim nyob rau hauv lub txias txias pom tsawg oxidation thiab thermal cycling kev nyuaj siab. Qhov no ncaj qha txhim kho lub neej ntawm lub tshuab cua sov - feem ntau mus rau qhov tseem ceeb ntawm 1.5 mus rau 2 npaug ntawm cov huab cua ib txwm muaj- qhov sib txawv tsim.

2. Cov hneev taw me me, siab dua tso cai Watt ceev
Lub rhaub yog khiav ntawm ib tug ntau dua watt ceev, tiam sis tib lub siab tshaj plaws hlau kub yuav tsum tau khaws cia vim ib tug ntau yam nyob rau hauv kub tis. Rau cov ntawv thov nyuaj xws li siab - ntws corrosive kua kab lossis compact tank installation, graphene thermal interface PTFE rhaub tuaj yeem muab nrog 15-25% siab dua watt ntom yam tsis pub dhau 110℃qhov kub ntawm qhov txwv ntawm PTFE sheath. Qhov no tso cai rau lub tshuab ua kom lub cev me me los muab cov khoom siv hluav taws xob zoo ib yam, tso tawm cov txheej txheem tseem ceeb.

3. Txo qhov pheej hmoo ntawm Localized PTFE Degradation
Hauv cov khoom siv hluav taws xob ib txwm muaj, cov chaw kub kub ntawm lub kauj tuaj yeem ua kom cov phab ntsa kub ntawm cov PTFE nyob ib puag ncig siab tshaj 110℃thaum lub sij hawm luv luv txawm tias cov ntaub npog qhov chaw txias dua. Qhov no nws thiaj li ua rau lub zos softness, creep los yog dielectric vau. Lub graphene TIM kis cov cua sov tom qab ua ntej nws mus rau PTFE, tshem tawm cov huab cua micro- kub. Lub polymer undergoes ib tug ntau dua thermal load, cia nws mechanical thiab hluav taws xob zog yuav tsum tau khaws cia rau lub sij hawm ntev.

Engineering Challenges & Solutions
Qhov teeb meem tseem ceeb hauv kev ua graphene- txhim kho TIM rau PTFE cov cua sov yog cov khoom siv yuav tsum muaj peev xwm tiv taus ob qho tib si sab hauv kev ua haujlwm kub (txog 200-250℃ntawm cov hlau nto) thiab PTFE sintering txheej txheem uas tuaj yeem siab txog 360-380℃. Lub silicone matrix yuav tsum tau hloov nrog lub siab - kub ruaj khov binder xws li fluoropolymer los yog polyimide raws li composite uas yuav tsis deteriorate thaum sintering.

Lub TIM tseem yuav tsum tau ua hluav taws xob rwb thaiv tsev kom tsis txhob luv luv ntawm cov kab nyob sib ze ntawm cov hlau tsis sib haum lossis nruab nrab ntawm cov hlau tsis kam thiab cov hauv paus hauv qab. Graphene ua hluav taws xob, tab sis yog tias koj kis tau ntawm qhov tsis tshua muaj siab (feem ntau yog 5 mus rau 10 qhov hnyav feem pua) nyob rau hauv ib qho insulating polymer matrix, koj tsis tau raws li percolation pib rau hluav taws xob conduction. Lub resultant composite nrog ib tug siab thermal conductivity tswj lub dielectric zog ntawm tshaj 5 kV / mm.

Cov ntawv thov rau yav tom ntej.
Kev txais yuav thaum ntxov ntawm graphene- txhim kho kev sib txuas tau tshwm sim hauv kev lag luam uas lub sijhawm ua haujlwm, kev cog lus thiab kev ua siab phem tshuaj lom neeg tau ntsib:

Semiconductor ntub ua cov tubs nrog kev tswj qhov kub thiab txias thiab qhov chaw me me hauv pem teb.

Pharmaceutical reactors ntawm siab purity qhov twg hloov cov cua sov yog kim thiab siv sij hawm.

Kev kub ceev- nce mus txog yuav tsum tau rau cov kab hluav taws xob uas muaj watt ceev.

Raws li cov txheej txheem tsim khoom rau graphene-loaded TIMs paub tab, tus nqi hwm tau kwv yees yuav txo qis, ua rau cov thev naus laus zis no muaj rau ntau hom kev siv cua sov.

Xaus
Ib qho kev sib txuas ntxiv nrog graphene tuaj yeem daws qhov teeb meem ntawm kev hloov hluav taws xob sab hauv- tsis sib xws ntawm cov cua sov los ntawm cov hlau tsis sib haum- ua kom lub PTFE lub rhaub muaj zog, nrawm dua thiab ruaj khov ntawm sab hauv tawm. Lub graphene thermal interface PTFE tso cua sov muab cov cua txias ua haujlwm, zoo dua tso cai watt ceev hauv qhov me me thiab qis dua hauv zos PTFE deterioration. Nyob rau hauv lub sheath, lub neej yav tom ntej ntawm cua sov tshuab yog ua nyob rau ntawm nanoscale, qhov uas ib tug ntxhi - nyias txheej ntawm ib tug xav tsis thoob yog ntsiag to hloov ib yam khoom uas paub tab.