Yuav Ua Li Cas Cov Ntsiab Lus (15% iav Fiber vs. Unfilled) hauv PFA (Perfluoroalkoxy) Lub Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Hwj Pleev ntawm 200℃Hauv qab Hoop Stress ntawm 3 MPa?
Tso lus
Creep yog ib qho teeb meem txwv nyob rau hauv PFA lub rhaub dej ntawm 200℃thiab 3 MPa hoop stress. PFA unfilled muaj tus nqi nkag ntawm 1-2% rau 1,000 teev ntawm 200 degree. PFA nrog 15% iav fiber ntau muaj qhov nkag ntawm 0.2-0.5% / 1,000 hr, kev txhim kho ntawm 4-5 ×. Cov iav fibers yog ib qho kev txhawb nqa thiab nqa cov khoom thauj, tiv thaiv cov saw hlau polymer los ntawm kev swb. Txawm li cas los xij, cov iav fibers tsim qhov chaw ntawm kev ntxhov siab thiab tuaj yeem ua rau cov tshuaj tsis muaj zog.
Yuav ua li cas iav Fiber Reinforcement Minimizes Creep
Nyob rau hauv qhov khoob PFA, creep tshwm sim ntawm uncoiling thiab saw slippage nyob rau hauv load. Cov iav fibers (15 wt %, 10-20 µm txoj kab uas hla, 200-400 µm ntev) cuam tshuam kev txav ntawm cov saw hlau polymer. Tus nqi nkag yog muab los ntawm: ε̇=ε̇_0 × (1 - V_f)^n, qhov twg V_f yog qhov feem pua ntawm cov fiber ntau thiab n ≈ 2. Tsis tas li ntawd, iav fibers tsa lub elastic modulus mus txog 1,200-1,500 MPa (15% iav) los ntawm 600 MPa (unfilled).
Quantitative Creep Rate Versus iav Fiber Cov ntsiab lus
Rau PFA, tswj kev ntsuas creep ntawm 200℃thiab 3 MPa hoop stress tau qhia cov hauv qab no. iav fiber ntau (unfilled) Creep tus nqi 0% 1.0-2.0% rau 1,000 teev Lub sij hawm mus rau 5% strain 2,500-5,000 teev Elastic modulus 500-700 MPa Rau 5% iav fiber, lub creep tus nqi yog 0.6-1.2% / 10004 strain sij hawm 00-8 teev, Modulus yog 700-900 MPa. Rau 10% iav fiber ntau, nkag tus nqi ntawm 0.3-0.8% / 1000 h, lub sij hawm mus rau 5% strain ntawm 6000-15000 h, thiab modulus ntawm 900-1,200 MPa. Rau 15% iav fiber ntau creep tus nqi yog 0.2-0.5% rau 1,000 teev, lub sij hawm mus rau 5% lim yog 10,000-25,000 teev thiab modulus yog 1,200-1,500 MPa. Rau 20% iav fiber ntau, creep tus nqi yog 0.1-0.3% rau 1,000 teev, lub sij hawm mus rau 5% lim yog 15,000-40,000 teev, thiab modulus yog 1,500-1,800 MPa.
Creep resistance iav fiber ntau cov ntsiab lus qhia kev xaiv
Cov ntsiab lus iav fiber ntau (%) Kev nkag siab ntawm 200℃(% / 1,000 h) Lub Sijhawm rau 5% strain (h) Elastic modulus (MPa) Pom zoo rau 200℃Kev Pabcuam 0 1.0-2.0 2,500-5,000 500-700 Tsis yog
5 0.6-1.2 4,000-8,000 700-900 Txwv 10 0.3-0.8 6,000-15,000 900-1,200 Yog (intermittent) 15 0.2-0.5 10,000-25,000 1,200-1,500 Yog (nruam) 20 0.1-0.3 15,000-40},{014-40,5)
iav -PF puv PFA - Kev xav txog engineering
Iav- puv PFA tau txo cov tshuaj tiv thaiv hauv qee qhov xov xwm (HF, muaj zog alkalis ntawm qhov kub siab). Cov iav fibers muab qhov chaw ntxhib thiab tuaj yeem txhawb nqa fouling. CTE txo nrog cov ntsiab lus iav, txo qis qhov tsis sib xws hauv thermal expansion. Thermal conductivity nce me ntsis 15% iav- puv PFA yog pom zoo rau 200℃kev pab cuam ntawm 3 MPa hoop stress.
Ib qho Specification qhia
Rau lub raj cua sov PFA ntawm 200℃thiab 3 MPa hoop kev ntxhov siab qhia 15% iav fiber ntau puv PFA kom txo qis nkag mus rau 0.2-0.5% / 1,000 teev. Tus kws tshaj lij ntxiv cov iav fiber ntau txhawm rau txhim kho qhov nkag siab.
