Polytetrafluoroethylene (PTFE), uas paub zoo txog nws txoj kev ruaj khov tshuaj lom neeg zoo heev, kev tiv taus kub siab/qis, thiab kev sib txhuam qis, tau khwv tau lub npe menyuam yaus "Yas King" thiab siv dav hauv kev lag luam tshuaj lom neeg, tshuab, thiab hluav taws xob. Txawm li cas los xij, PTFE ntshiab muaj qhov tsis zoo xws li lub zog kho tshuab qis, kev cuam tshuam rau kev hloov pauv dej txias, thiab kev ua haujlwm thermal tsis zoo. Txhawm rau kov yeej cov kev txwv no, cov iav fiber reinforced PTFE composites tau tsim. Cov khoom siv no txhim kho ntau yam kev ua tau zoo thaum khaws cov khoom zoo dua ntawm PTFE, ua tsaug rau cov nyhuv txhawb nqa ntawm cov iav fibers.
1. Kev Txhim Kho Tseem Ceeb ntawm Cov Khoom Siv Kho Tshuab
Cov qauv molecular saw hlau sib npaug thiab crystallinity siab ntawm PTFE ntshiab ua rau cov zog intermolecular tsis muaj zog, ua rau lub zog thiab qhov nyuaj tsawg. Qhov no ua rau nws yooj yim deformation nyob rau hauv lub zog sab nraud loj, txwv nws cov ntawv thov hauv cov teb uas xav tau lub zog siab. Kev koom ua ke ntawm cov iav fibers coj kev txhim kho zoo rau cov khoom siv kho tshuab ntawm PTFE. Cov iav fibers yog tus cwj pwm los ntawm lawv lub zog siab thiab modulus siab. Thaum sib npaug sib npaug hauv PTFE matrix, lawv tau dais cov khoom thauj sab nraud, txhim kho tag nrho cov kev ua haujlwm kho tshuab ntawm cov khoom sib xyaw. Kev tshawb fawb qhia tau hais tias nrog kev ntxiv ntawm cov iav fiber ntau, lub zog tensile ntawm PTFE tuaj yeem nce ntxiv 1 txog 2 zaug, thiab lub zog flexural dhau los ua qhov zoo tshaj plaws, txhim kho los ntawm kwv yees li 2 txog 3 zaug piv rau cov khoom qub. Hardness kuj nce ntxiv ntau. Qhov no tso cai rau iav fiber reinforced PTFE ua haujlwm tau zoo hauv cov chaw ua haujlwm nyuaj dua hauv kev tsim khoom siv tshuab thiab aerospace, xws li hauv cov khoom siv tshuab thiab cov khoom siv bearing, txo cov kev ua tsis tiav los ntawm cov khoom siv tsis txaus.
2. Kev Ua Haujlwm Thermal Zoo Tshaj Plaws
Txawm hais tias PTFE ntshiab ua tau zoo hauv kev tiv taus kub thiab qis, muaj peev xwm siv tau ntev ntawm -196 ° C thiab 260 ° C, nws qhov ruaj khov tsis zoo ntawm qhov kub siab, qhov twg nws yooj yim rau kev hloov pauv thermal. Kev ntxiv cov iav fibers zoo daws qhov teeb meem no los ntawm kev nce cov khoom siv kub deflection kub (HDT) thiab qhov ruaj khov. Cov iav fibers lawv tus kheej muaj kev tiv thaiv kub siab thiab rigidity. Hauv qhov chaw kub siab, lawv txwv tsis pub txav mus los ntawm PTFE molecular saw, yog li ntawd txwv tsis pub thermal nthuav dav thiab deformation ntawm cov khoom siv. Nrog rau cov iav fiber zoo tshaj plaws, qhov kub deflection kub ntawm iav fiber reinforced PTFE tuaj yeem nce ntau dua 50 ° C. Nws tswj cov duab ruaj khov thiab qhov tseeb ntawm qhov ntev hauv qab qhov kub siab ua haujlwm, ua rau nws tsim nyog rau cov ntawv thov nrog kev ruaj khov thermal siab, xws li cov kav dej kub siab thiab cov gaskets kub kub.
3. Txo Qhov Kev Nqus Dej Txias
Kev ntws txias (lossis creep) yog qhov teeb meem tseem ceeb nrog PTFE ntshiab. Nws hais txog qhov qeeb yas deformation uas tshwm sim nyob rau hauv lub nra hnyav tas li dhau sijhawm, txawm tias nyob rau hauv qhov kub qis. Cov yam ntxwv no txwv tsis pub siv PTFE ntshiab hauv cov ntawv thov uas xav tau lub sijhawm ntev thiab kev ruaj khov. Kev koom ua ke ntawm cov iav fibers zoo inhibits qhov tshwm sim ntws txias ntawm PTFE. Cov fibers ua raws li lub cev pob txha txhawb nqa hauv PTFE matrix, cuam tshuam kev swb thiab kev hloov pauv ntawm PTFE molecular saw. Cov ntaub ntawv sim qhia tau hais tias qhov ntws txias ntawm iav fiber reinforced PTFE raug txo los ntawm 70% txog 80% piv rau PTFE ntshiab, ua rau muaj kev ruaj khov ntawm cov khoom siv nyob rau hauv lub sijhawm ntev. Qhov no ua rau nws tsim nyog rau kev tsim cov khoom siv kho tshuab siab thiab cov khoom siv.
4. Txhim Kho Kev Hnav Tsis Zoo
Qhov coefficient qis ntawm PTFE ntshiab yog ib qho ntawm nws cov txiaj ntsig, tab sis nws kuj tseem ua rau nws tsis zoo hnav tsis kam, ua rau nws yooj yim hnav thiab hloov pauv thaum lub sijhawm sib txhuam. Cov iav fiber ntxiv dag zog PTFE txhim kho qhov nyuaj ntawm qhov chaw thiab hnav tsis kam ntawm cov khoom siv los ntawm cov nyhuv txhawb nqa ntawm cov fibers. Qhov nyuaj ntawm cov iav fiber yog siab dua li ntawm PTFE, ua rau nws tiv taus hnav thaum lub sijhawm sib txhuam. Nws kuj hloov pauv qhov sib txhuam thiab hnav mechanism ntawm cov khoom siv, txo cov nplaum hnav thiab abrasive hnav ntawm PTFE. Ntxiv mus, cov iav fibers tuaj yeem tsim cov protrusions me me ntawm qhov sib txhuam nto, muab qee qhov kev tiv thaiv kev sib txhuam thiab txo qhov kev hloov pauv ntawm cov coefficient sib txhuam. Hauv kev siv ua haujlwm, thaum siv ua cov khoom siv rau cov khoom sib txhuam xws li cov kabmob swb thiab cov nplhaib piston, lub neej ua haujlwm ntawm cov iav fiber ntxiv dag zog PTFE tau ntev dua, tej zaum los ntawm ntau zaus lossis txawm tias ntau kaum zaus piv rau PTFE ntshiab. Cov kev tshawb fawb tau qhia tias qhov tsis kam hnav ntawm PTFE composites puv nrog iav fiber tuaj yeem txhim kho los ntawm ze li ntawm 500 zaug piv rau cov ntaub ntawv PTFE tsis tau ntim, thiab tus nqi PV txwv tau nce txog 10 zaug.
5. Kev Ua Haujlwm Thermal Zoo Dua
PTFE ntshiab muaj qhov ua tau zoo thermal conductivity qis, uas tsis zoo rau kev hloov pauv cua sov thiab ua rau muaj kev txwv hauv cov ntawv thov uas muaj qhov yuav tsum tau ua kom sov siab. Cov iav fiber muaj qhov ua tau zoo thermal conductivity, thiab nws ntxiv rau PTFE tuaj yeem, qee qhov, txhim kho qhov ua tau zoo thermal conductivity ntawm cov khoom. Txawm hais tias kev ntxiv cov iav fiber tsis ua rau cov coefficient thermal conductivity ntawm PTFE ntau ntxiv, nws tuaj yeem tsim cov kev ua kom sov hauv cov khoom, ua kom nrawm ntawm kev hloov pauv cua sov. Qhov no muab cov iav fiber reinforced PTFE zoo dua rau kev siv hauv cov khoom siv hluav taws xob thiab hluav taws xob, xws li hauv cov thermal pads thiab cov khoom siv hauv Circuit Board, pab daws cov teeb meem kub ntxhov uas cuam tshuam nrog qhov ua tau zoo thermal conductivity ntawm PTFE ntshiab. Qhov ua tau zoo thermal conductivity kuj pab txo qhov kub ntxhov hauv cov ntawv thov xws li bearings, pab txhawb rau kev ua tau zoo dua.
Daim Ntawv Thov: Cov khoom sib xyaw no siv dav hauv cov foob pob hluav taws xob, cov kabmob / bushings siab, cov khoom siv semiconductor, thiab ntau yam khoom siv uas tiv taus kev hnav hauv kev lag luam tshuaj lom neeg. Hauv kev lag luam hluav taws xob, nws siv rau hauv kev tsim cov gaskets rwb thaiv tsev rau cov khoom siv hluav taws xob, rwb thaiv tsev rau cov laug cam hluav taws xob, thiab ntau yam foob pob hluav taws xob. Nws txoj haujlwm tau nthuav dav mus rau kev lag luam aerospace rau cov txheej rwb thaiv tsev thermal yooj ywm.
Lus Cim Txog Kev Txwv: Txawm hais tias cov iav fiber ua rau ntau yam khoom zoo dua, nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias thaum cov iav fiber ntau ntxiv, lub zog tensile, elongation, thiab toughness ntawm cov khoom sib xyaw yuav txo qis, thiab cov coefficient friction tuaj yeem maj mam nce. Ntxiv mus, cov iav fiber thiab PTFE composites tsis haum rau kev siv hauv alkaline media. Yog li ntawd, cov qauv, suav nrog feem pua ntawm cov iav fiber (feem ntau 15-25%) thiab kev sib xyaw ua ke nrog lwm cov khoom sau xws li graphite lossis MoS2, yog tsim los ua kom tau raws li cov kev xav tau ntawm daim ntawv thov tshwj xeeb.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-05-2025