Kev sib txhuam qis thiab kev siv hluav taws xob tsawg kawg yog qhov kev txiav txim siab zoo uas muab los ntawm PTFE seals.Cov ntsaws ruaj ruaj yuav siv tau yam tsis muaj teeb meem nrog rau qhuav…
Txawm hais tias nws cov khoom muaj txiaj ntsig zoo kawg nkaus, tsis muaj dej los yog nkauj xwb PTFE yog qhov tsis txaus rau ntau qhov kev thov engineering ntxiv.Tshwj xeeb, nws cov dej txias lossis tus cwj pwm nkag tau txwv tsis pub siv PTFE hauv kev siv tshuab.Txawm nyob rau hauv chav tsev kub, PTFE muaj ib tug tseem ceeb deformation nyob rau hauv lub sij hawm thaum nws raug mus rau ib tug tas mus li load.Kuj, PTFE nkauj xwb tsis muaj resilience thiab hnav sai heev txawm tias nws tsis tshua muaj coefficient ntawm kev sib txhuam. Nyob rau hauv lub xyoo 1960, qhov sib ntxiv ntawm fillers tau pom. txhim kho ntau yam khoom ntawm lub cev, tshwj xeeb tshaj yog nkag thiab hnav tus nqi.Cov fillers feem ntau ruaj khov mus txog 400 ° C, yog li lawv tsis txwv kev siv rau hauv qhov kub thiab txias.Lus npe hauv qab no yog qee cov ntsiab lus muab tub lim thiab lawv cov nyhuv ntawm lub cev ntawm PTFE compound.
iav fiber ntau
Cov iav fiber ntau yog cov khoom siv feem ntau siv nrog kev cuam tshuam zoo ntawm kev ua haujlwm ntawm PTFE, uas txo qis ntawm qhov kub thiab txias.Nws kuj ntxiv hnav tsis kam thiab muaj zog compression zoo.Qhov no additive yog tshuaj inert tsuas yog nyob rau hauv lub xub ntiag ntawm hydrofluoric acid thiab muaj zog bases.Nws muaj me ntsis cuam tshuam rau cov khoom hluav taws xob.
Carbon thiab carbon-graphite
Cov pa roj carbon yuav txo qis, nce hardness thiab elevates lub thermal conductivity ntawm PTFE.Hnav tsis kam ntawm cov khoom sib xyaw ua ke zoo txhim kho tshwj xeeb hauv kev ua ke nrog graphite.Carbon yog ib qho ntawm feem ntau inert fillers tshwj tsis yog nyob rau hauv oxidizing ib puag ncig uas iav ua tau zoo dua.Carbon muab ib co hluav taws xob conductivity rau PTFE.PTFE ntim nrog cov pa roj carbon feem ntau yog siv rau hauv pneumatic sealing applications.Compounds nrog cov pa roj carbon monoxide ua ke nrog graphite yog cov khoom nyiam rau cov ntawv thov tsis muaj roj.
Carbon fiber ntau
Qhov sib ntxiv ntawm carbon fiber rau PTFE hloov nws cov khoom zoo ib yam li iav fiber ntau.Nws txo qis creep, nce flex thiab compressive modulus thiab nce hardness.Feem ntau, tsawg carbon fiber ntau dua iav fiber ntau yog xav tau kom ua tiav cov nyhuv tib yam.Cov coefficient ntawm thermal expansion yog qis dua thiab thermal conductivity yog siab dua rau cov tebchaw ntawm carbon fiber ntau PTFE.Hnav tus nqi txo qis thaum cov roj carbon fiber ntau yog lubricated nrog dej.Carbon fiber yog chemically inert thiab tuaj yeem siv rau hauv cov hauv paus muaj zog thiab hydrofluoric acid.
Graphite
Graphite yog crystalline hloov kho ntawm high-purity carbon.Graphite puv PTFE muaj ib qho ntawm cov coefficients qis tshaj ntawm kev sib txhuam vim qhov tsis tshua muaj kev sib txhuam ntawm graphite.Nws muaj cov khoom hnav zoo heev, tshwj xeeb tshaj yog tiv thaiv cov tawv nqaij mos thiab nthuav tawm lub peev xwm thauj khoom siab hauv kev sib cuag nrog kev kub ceev.Graphite yog tshuaj inert uas ua rau nws siv nyob rau hauv corrosive media.
Bronze
Bronze yog ib hom hlau muab tub lim.Cov khoom loj (40 mus rau 60% los ntawm qhov hnyav) ntawm bronze txo deformation nyob rau hauv load thiab nce lub thermal thiab hluav taws xob conductivity ntawm PTFE tebchaw.Ob tus yam ntxwv no muaj txiaj ntsig zoo rau cov ntawv thov uas ib feem raug thauj khoom ntawm qhov kub thiab txias.Bronze ntim PTFE muaj cov yam ntxwv zoo extrusion tsis kam.Bronze yog ib qho alloy ntawm tooj liab thiab tin thiab tuaj yeem tawm tsam los ntawm qee yam tshuaj.Oxidation ntawm bronze tuaj yeem ua rau muaj qhov tsis zoo ntawm qhov ua tiav yam tsis muaj kev cuam tshuam rau qhov zoo ntawm cov khoom.PTFE ntim nrog tooj liab yog dav siv hauv hydraulic pas nrig thiab piston foob daim ntawv thov.
Molybdenum disulfide (MoS2)
Molybdenum disulphide tsub kom lub hardness thiab nruj ntawm PTFE thaum txo kev sib txhuam.Nws tsis tshua muaj txiaj ntsig rau nws cov khoom siv hluav taws xob.Chemically, feem ntau tsis yog-reactive thiab dissolves tsuas yog nyob rau hauv muaj zog oxidizing acids.Nws feem ntau yog siv nyob rau hauv me me qhov hnyav feem pua thiab ua ke nrog lwm cov fillers xws li iav fiber.
Aromatic polyester
Aromatic polyester raws li ib tug muab tub lim ua rau lub siab kub tsis kam ntawm PTFE thiab yog zoo heev rau siv nrog mos, dynamic mating nto.Tsis pom zoo rau sealing daim ntaub ntawv uas muaj qhov kub siab tshaj 120 ° C.
Xim additives
Nws muaj peev xwm ua kom xim PTFE los ntawm kev siv cov xim inorganic additives uas tiv taus qhov kub thiab txias ntawm PTFE.Pigments tsis cuam tshuam cov khoom ntawm PTFE.Kev sib xyaw ntawm cov pigments thiab lwm cov fillers tuaj yeem ua tau.Proprietary fillers thiab muab tub lim ua keParker tsis tu ncua rau kev tshawb nrhiav thiab tsim cov khoom sib xyaw tshwj xeeb thiab cov qauv tsim los txhim kho kev sib khi hauv cov ntawv thov huab cua tshaj plaws.
Post lub sij hawm: Aug-16-2016