Yuav ua li cas cov thermal conductivity ntawm PTFE hloov nrog kub thiab muab tub lim?

Lub ntsiab thermal drawback ntawm PTFE yog nws cov thermal conduction tsawg. Cov cuab yeej no, txawm li cas los xij, tsis tas li tab sis nws txawv ntawm qhov kub thiab txias tuaj yeem hloov kho los ntawm kev sib ntxiv ntawm cov tshuaj. Qhov kev nkag siab ntawm qhov sib txawv no tso cai rau kev kwv yees ntawm cov cua sov ua haujlwm hauv kev pabcuam. Qhov kub muab tub lim nyhuv ntawm thermal conductivity ntawm PTFE yog soj ntsuam thiab ob qho tib si kub dependence thiab cov ntaub ntawv formulation yog ncaj qha koom nyob rau hauv lub tshav kub hloov tsim txwv.

Pure PTFE: Baseline Thermal Behavior
Pure PTFE muaj cov thermal conductivity txog 0.25 W / m K ntawm ambient kub. Qhov no ua rau nws zoo nyob rau hauv cov khoom siv hluav taws xob tsawg, tsawg dua cov hlau thiab txawm tias muaj ntau yam yas yas.

Nrog nce kub, thermal conductivity yog me ntsis nce. Qhov nce yog nruab nrab thiab tsis hloov qhov tseem ceeb insulating cim ntawm cov khoom. Cov hluav taws xob conductivity ntawm PTFE tsis mus txog qib hlau txawm tias kub. Nws tseem yog thermal barrier. Muaj kev txhim kho tsawg kawg nkaus hauv kev ua haujlwm ntawm kev thauj mus los ntawm tshav kub raws li cov molecular txav tau nce.

Nws yog ib qho tsim nyog hais tias qhov kev txhim kho qhov kub thiab txias no yog me ntsis me me hauv kev sib piv rau tag nrho cov hauv paus tsis zoo conductivity.

Kev cuam tshuam ntawm qhov kub thiab txias ntawm kev hloov hluav taws xob muaj peev xwm
Qaug nce nrog cua sov
PTFE molecular mobility nce nrog nce kub, ua rau me ntsis ntau npaum li cas phonon thauj. Qhov no ua rau muaj kev txhim kho me ntsis hauv thermal conductivity, txawm hais tias cov khoom tseem yog ib qho insulator.

Nyob rau hauv cov txheej txheem thermal qhov no txhais tau hais tias lub rhaub cov lus teb ntawm PTFE sheaths tseem txwv los ntawm cov conduction kuj. Qhov nce ntawm qhov kub thiab txias ntawm cov khoom yog li ntawd heev nyob ntawm qhov kub thiab txias flux thiab thickness es tsis yog ib tug hloov ntawm tej conductivity.

Txawm tias nyob rau hauv kev ua haujlwm siab PTFE tseem ua raws li kev tiv thaiv kev tiv thaiv, tsis yog ib qho khoom siv hluav taws xob zoo.

Qhov cuam tshuam ntawm Fillers ntawm Thermal Conductivity
Kev hloov kho ntawm Carbon, Graphite thiab iav
Kev siv cov fillers ua rau muaj kev hloov pauv loj hauv conductivity. Siv cov pa roj carbon fillers xws li carbon dub lossis graphite tshaj nkauj xwb PTFE, cov thermal conductivity tuaj yeem txhim kho ob mus rau peb zaug. Cov iav fibers kuj hloov thermal tus cwj pwm txawm hais tias tsis muaj qhov cuam tshuam tseem ceeb feem ntau nyob rau hauv cov nqe lus ntawm conductivity augmentation.

Cov kev hloov pauv zoo li no ua rau cov khoom sib xyaw nrog ib feem txhim kho cov hluav taws xob xa hluav taws xob los ntawm cov khoom siv hluav taws xob sib txuas sib txuas hauv cov polymer matrix.

Txawm li cas los xij, qhov nce hauv cov thermal conductivity ua, muaj kev lag luam -offs. Mechanical elasticity txo, elongation ntawm so thiab brittleness nce. Cov kev hloov pauv no cuam tshuam rau kev ua haujlwm ntev nyob rau hauv lub tshav kub cycling thiab mechanical stress nyob rau hauv lub sij hawm ntev.

Tsis tas li ntawd, cov fillers tuaj yeem ua rau cov tshuaj tiv thaiv tsis muaj zog lossis tsim cov microchannels uas yuav ua rau muaj kev tsis txaus siab ua tiav hauv ultra- thaj chaw tshuaj dawb huv.

Summary of Thermal Conductivity Comparison