Kev sib piv ntawm cov thermoplastic carbon fiber thiab thermosetting carbon fiber rau aerospace kev siv.
Txij li xyoo txhiab xyoo tshiab, kev ua tiav tseem ceeb tau ua tiav hauv kev tshawb fawb thiab kev tshawb fawb ntawm ntau yam khoom siv tshiab, xws li cov iav fiber ntau tam sim no, carbon fiber, thiab aramid fiber ntau. Kab lus no yuav qhia txog carbon fiber thiab nws cov khoom sib xyaw, hu ua "dub kub." Cov pa roj carbon fiber tau nyob ib puag ncig ntau dua ib puas xyoo, thiab nrog kev txhim kho txuas ntxiv, nws tau maj mam pom cov ntawv thov hauv cov khoom siv kis las thiab Formula 1 cov tsheb sib tw. Tam sim no, cov khoom siv tseem ceeb yog thermosetting carbon fiber composites, uas muaj xws li thermosetting resins xws li epoxy resin, phenolic resin, thiab bismaleimide resin.
Cov thermoplastic carbon fiber ntau yog tsim nyog rau kev siv aerospace.
Nrog rau kev nce qib ntawm kev tshawb fawb ntawm carbon fiber ntau thiab ntau yam yas, nws tau pom tias siv cov yas tshwj xeeb ua cov matrix ua ke nrog cov pa roj carbon fiber ntau tuaj yeem ua kom zoo dua cov yam ntxwv ntawm cov pa roj carbon fiber ntau. Yog tias txuas ntxiv carbon fiber reinforced thermoplastic composites tuaj yeem tsim tau ntau, tag nrho cov kev lag luam yuav tau txais txiaj ntsig, thiab kev lag luam high-end xws li aerospace thiab chaw kho mob yuav muaj kev loj hlob loj. Tam sim no, qhov zoo ntawm carbon fiber epoxy resin composites-xws li lub zog siab, qis creep, siab modulus, thiab tus nqi qis-tau raug pov thawj muaj feem xyuam rau lub tshav dav hlau. Txawm li cas los xij, lawv qhov tsis muaj zog kuj tseem muaj pov thawj, suav nrog kev siab brittleness, susceptibility to splitting, thiab high noo noo nqus tus nqi, uas ua rau tej yam kev pheej hmoo ntawm daim ntawv thov. Kev koom ua ke ntawm cov ntaub ntawv thermoplastic matrix tuaj yeem daws cov kev ua haujlwm tsis zoo thiab qhib qhov muaj peev xwm tshiab rau carbon fiber ntau.
Muaj ntau cov yas tshwj xeeb uas ua tau zoo, xws li Polyether Ether Ketone (PEEK), Polyether Ketone Ketone (PEKK), Polyether Ketone Ether Ketone Ketone (PEKEKK), Polyether imide (PEI), Polyphenylene Sulfide (PPS), thiab Polyamide (PA ). Cov thermoplastic matrix resins tuaj yeem muab cov qauv ntawm lub cev zoo dua thiab cov khoom siv tshuaj lom neeg rau carbon fiber. Siv Polyether Ether Ketone (PEEK) ua piv txwv, nws muaj qhov kub hloov pauv iav (Tg) ntawm ib ncig ntawm 150 degree thiab melting point ntawm txog 370 degree, uas ua rau muaj txiaj ntsig zoo rau qhov kub thiab txias ntawm carbon fiber composites. Tsis tas li ntawd, nws zoo dua tswj cov khoom muaj txiaj ntsig ntawm cov pa roj carbon fiber ntau, ua kom lub zog zoo, toughness, tshuaj tsis haum, thiab hnyav ua haujlwm. PEEK kuj muaj cov thermal stability zoo heev, nplaim taws retardancy, thiab tsis tshua muaj hluav taws xob tsis tu ncua, ua rau nws yog ib qho ntawm cov khoom siv zoo heev rau kev siv aerospace yav tom ntej.
Kev sib piv ntawm Thermoplastic thiab Thermosetting Carbon Fiber rau Aerospace Applications
Cov pab pawg tshawb fawb tau ua qhov kev tshawb fawb tob txog ntawm thermosetting thiab thermoplastic carbon fiber ntau rau kev siv dav hlau, sib piv carbon fiber reinforced polyether ketone (PEK) composites nrog carbon fiber reinforced epoxy resin composites.
1.Carbon Fiber Reinforced Polyether Ketone Phaj: Cov khoom sib xyaw no muaj cov laminate ua los ntawm 60% carbon fiber thiab 40% polyether ketone (PEK). Nws nta kaum txheej ntawm bidirectional carbon fiber tso rau ntawm kaum ib txheej ntawm PEK, nrog PEK zaj duab xis nyob rau sab saum toj thiab hauv qab. Lub stacked CF / PEK yog nias ntawm 410 degree hauv qab 10 Bar siab rau 30 feeb.
2.Carbon Fiber Epoxy Resin Phaj: Cov khoom sib xyaw no siv LY556 epoxy resin ua cov khoom siv matrix, ntxiv dag zog nrog cov ntaub ntawv bidirectional carbon. Nyob rau hauv chav tsev kub, HY951 curing tus neeg sawv cev yog ntxiv rau epoxy resin, tov nyob rau hauv ib tug ratio ntawm 100:12. Cov pa roj carbon fiber ntau yog khaws cia ntawm 60 wt%, uas ua rau kwv yees li 3 hli tuab carbon fiber epoxy resin laminate siv kaum txheej ntawm ntaub.
3. Kev Ntsuas Kev Ntsuas: Kev ntsuam xyuas kev ua haujlwm tau ua tiav ntawm ob hom carbon fiber daim hlau uas tau hais los saum toj no, suav nrog kev sim tensile, kuaj hardness, thiab kev kuaj pob txha toughness. Tsis tas li ntawd, kev ntsuas kev ua haujlwm thermal tau ua tiav ntawm ob daim paib carbon fiber ntau, suav nrog kev ntsuas qhov sib txawv (DSC) thiab ntsuas qhov ntsuas qhov ntsuas oxygen (LOI).
4.Qhov Kev Ntsuas Kev Ua Haujlwm Qhia:
A. Tensile Strength thiab Modulus: Qhov nruab nrab tensile lub zog thiab modulus ntawm carbon fiber reinforced polyether ketone (PEK) composites yog 425 MPa thiab 7.8 GPa, raws li, thaum lub sij hawm nruab nrab tensile zog thiab modulus ntawm carbon fiber reinforced epoxy resin composites yog 311 MPa thiab 5.2 GPa, feem. Lub elongation ntawm tawg rau carbon fiber reinforced PEK composites yog 9.43%, whereas rau carbon fiber reinforced epoxy resin composites yog 11.32%.
B. Hardness: Thaum cov pa roj carbon fiber ntxiv rau hauv matrix, tag nrho hardness ntawm cov khoom sib xyaw nce, qhia tias cov muab tub lim txhim khu kev tiv thaiv rau cov yas deformation. Lub hardness qhov tseem ceeb rau PEK thiab epoxy resin yog 87 thiab 85, feem, nrog cov sib xyaw hardness qhov tseem ceeb ntawm 94 thiab 89, qhia tsis muaj qhov sib txawv loj.
C. Fracture Toughness: Vim lub brittleness ntawm epoxy resin, qhov tawg toughness ntawm carbon fiber reinforced epoxy resin composites txo qis raws li matrix toughness txo. Hauv qhov sib piv, PEK matrix nthuav tawm qhov toughness zoo dua, ua rau kev txhim kho toughness hauv carbon fiber reinforced PEK composites. Qhov siab tshaj plaws load txiav txim siab thaum xam cov pob txha toughness yog qhov siab tshaj plaws ntawm cov khoom siv tuaj yeem tiv taus ua ntej tawg hauv SENB xeem; ib qho kev nyuaj siab ntau dua (Kic) sib raug rau cov tawv tawv dua. Cov txiaj ntsig tau pom tias Kic ntawm carbon fiber reinforced PEK composites yog 13.71 MPa·√m, thaum rau carbon fiber reinforced epoxy resin composites nws yog 11.53 MPa·√m, qhia txog kev ua tau zoo dua qub.
D. Thermal Cwj pwm thaum cua sov thiab txias: Cov thermotransitions ntawm polymer composites thaum cua sov thiab txias tau kawm siv DSC. Lub melting kub thiab crystallization kub ntawm lub matrix tau muab piv, qhia lub melting kub (Tm), crystallization kub (Tc), thiab iav hloov kub (Tg) ntawm cov qauv ntaub ntawv.
E. Limiting Oxygen Index: Kev ntsuam xyuas ntawm qhov txwv qhov ntsuas qhov ntsuas pa (LOI) qhia tau hais tias kev sib xyaw cov pa roj carbon fiber ntau rau hauv ob qho tib si matrix cov ntaub ntawv tseem ceeb txhim kho LOI. Cov ntaub ntawv qhia tias LOI rau epoxy resin thiab PEK yog 25 thiab 35, feem, thaum cov LOIs sib thooj rau cov pa roj carbon fiber ntau yog 32 thiab 47, nrog carbon fiber reinforced PEK composites qhia kev txhim kho tseem ceeb.
Los ntawm kev sim, cov kws tshawb nrhiav pom tias cov thermoplastic carbon fiber ntau nrog PEK raws li cov matrix outperform thermosetting carbon fiber composites nrog epoxy resin hla ntau yam kev ntsuas. Qhov sib txawv loj hauv cov ntaub ntawv qhia txog qhov tseem ceeb ntawm kev ua haujlwm tsis sib xws ntawm thermosetting thiab thermoplastic carbon fiber composites, qhia tias muaj peev xwm siv tau rau cov thermoplastic carbon fiber ntau, tshwj xeeb tshaj yog nyob rau hauv kev ua haujlwm siab xws li aerospace.
Txawm li cas los xij, vim li cas yog qhov kev siv cov thermoplastic carbon fiber ntau tsis tshua muaj ntau dua li cov thermosetting composites? Qhov no yog ze ze rau lawv cov txheej txheem kev ua haujlwm. Thermoplastic carbon fiber composites yuav tsum tau ua kom kub, thiab cov molten thermoplastic resin feem ntau tawm tsam kom tag nrho impregnate cov carbon fiber bundles. Yog tias cov kauj ruam no tsis ua tiav zoo, qhov kev ua tau zoo ntawm cov khoom siv thermoplastic carbon fiber ntau tuaj yeem poob qis ntawm cov thermosetting carbon fiber ntau tam sim no.
