Cov nyhuv ntawm pwm kub ntawm qhov sib txuas sib txuas lub zog hauv txheej txheej thiab molding txheej txheem ntawm thermoplastic CF-PAEK (PEEK).
Kev ua haujlwm siab thermoplastic carbon fiber composites nthuav tawm qhov zoo xws li siab tawv, cuam tshuam tsis kam, tsis tshua muaj dej nqus, thiab kev ua haujlwm zoo ib puag ncig. Kev tshawb fawb ntawm cov khoom siv sib xyaw no tau ua tsis tu ncua, ua rau muaj kev txhim kho ntau yam thermoplastic carbon fiber ntau nrog cov matrices sib txawv, nrog rau ntau txoj kev ua tau zoo, suav nrog kev txhaj tshuaj molding, compression molding, thiab txheej molding. High-temperature melting technology tau ntev tau suav tias yog ib qho ntawm cov thawj txoj hauv kev rau kev npaj cov thermoplastic carbon fiber composites. Daim ntawv no yuav qhia txog cov teebmeem ntawm pwm kub ntawm kev sib txuas ntawm lub zog rau kev sib txuas ntawm cov roj carbon fiber ntau ntxiv polyaryl ether ketone (CF-PAEK) thiab luv carbon fiber reinforced polyether ether ketone (CF-PEEK) thaum lub sij hawm txheej txheej molding, integrating kev pom los ntawm cov ntaub ntawv tshaj lij. .
Kev npaj ntawm Coated Composites los ntawm Thermoplastic CF-PAEK thiab CF-PEEK
Nruam cov pa roj carbon fiber reinforced thermoplastic polyaryl ether ketone (CF-PAEK) composites tau npaj siv unidirectional carbon fibers, uas tau tsim mus rau hauv tas li carbon fiber reinforced composite laminates los ntawm compression molding. Polyether ether ketone (PEEK) thiab luv carbon fiber reinforced polyether ether ketone (SCF-PEEK) tau raug xaiv los ua cov ntaub ntawv txhaj tshuaj, txhaj rau hauv pwm tso rau ntawm qhov chaw ntawm CF-PAEK laminates, thiab khaws cia nyob rau hauv siab rau qee lub sijhawm los tsim cov khoom sib xyaw. coated composites. Tom qab tso cua txias rau chav tsev kub, cov molded thermoplastic carbon fiber composites raug tshem tawm thiab txiav mus rau qhov ntau thiab tsawg. Ntau yam kev ntsuas kev ua tau zoo tau ua tom qab, suav nrog kev ntsuas cov cuab yeej cuab tam, kev tshuaj ntsuam xyuas electron microscopy (SEM), ntsuas qhov ntim feem ntau, kuaj tus cwj pwm rheological, thiab kuaj nanoindentation. Cov ntaub ntawv xeem tau raug teeb tsa, thiab cov lus xaus sib thooj tau raug kos los ntawm kev sib piv cov kev tshawb fawb ntawm ntau yam qauv.
Cov nyhuv ntawm pwm kub ntawm lub interfacial bonding zog ntawm thermoplastic CF-PAEK (PEEK) composites.
1.Viscosity-Cub Curves ntawm PAEK thiab PEEK Resins: Daim duab saum toj no qhia txog viscosity-kub nkhaus rau PAEK thiab PEEK resins. Cov ntaub ntawv qhia tias cov viscosity ntawm PAEK yog li ntawm 89 txog 237 Pa·s ntawm qhov kub ntawm 340 degree thiab 400 degree, thaum lub viscosity ntawm PEEK yog li ntawm 203 txog 330 Pa·s ntawm qhov kub ntawm 360 degree thiab 420 degree. Ob lub thermoplastic resins nthuav tawm tus cwj pwm shear-thinning, nrog viscosity txo qis thaum kub nce. Qhov qis dua qhov viscosity ntawm cov resin yaj, qhov zoo dua qhov diffusion, uas zoo cuam tshuam rau kev sib txuas ntawm lub zog.
2.Shear Strength ntawm Coated Composites ntawm txawv pwm kub: Daim duab saum toj no qhia txog kev ntxhov siab-txheej nkhaus rau PEEK thiab SCF-PEEK cov ntaub ntawv ntawm cov pwm kub sib txawv. Daim duab b nthuav qhia cov ntaub ntawv lub zog shear rau PEEK / CCF-PAEK thiab SCF-PEEK / CCF-PAEK ntawm qhov sib txawv pwm kub. Lub zog shear ntawm PEEK / CCF-PAEK yog 56 MPa, 65 MPa, 70 MPa, thiab 68 MPa, thaum lub zog shear ntawm SCF-PEEK / CCF-PAEK yog 77 MPa, 79 MPa, 85 MPa, thiab 71 MPa.
Cov txiaj ntsig tau qhia tias thaum pwm kub nce, lub zog shear ntawm cov qauv txhim kho. Tsis tas li ntawd, vim qhov kev txhawb nqa los ntawm cov pa roj carbon luv luv, lub zog shear ntawm SCF-PEEK / CCF-PAEK yog siab dua. Pwm kub cuam tshuam rau lub sijhawm sib txuas ntawm qhov kub thiab txias ntawm qhov txhaj tshuaj (PEEK thiab SCF-PEEK) thiab CCF-PAEK laminate, nrog rau lub sijhawm sib cuag ua ntej kho. Raws li cov pwm kub nce, qhov kub ntawm cov txheej txheej interfacial maj mam nce, txhawb cov melting thiab diffusion ntawm PAEK resin nyob rau hauv qis melting kub, yog li pab txhawb interfacial bonding zog.
3.Shear tsis ua hauj lwm hom ntawm Coated Composite Samples ntawm txawv pwm kub: Daim duab saum toj no qhia tau hais tias qhov tsis ua hauj lwm ntawm kev sib tsoo ntawm PEEK / CCF-PAEK coated composites ntawm qhov sib txawv pwm kub. Nws qhia tau hais tias nyob rau hauv qhov kev txiav txim ntawm shear rog, cov kab nrib pleb pib tsim ntawm ob sab ntawm cov qauv thiab txuas mus rau qhov chaw. Thaum cov pwm kub tau teem rau ntawm 220 degree thiab 240 degree, qhov tsis ua haujlwm ntawm PEEK / CCF-PAEK feem ntau tshwm sim los ntawm kev sib cuam tshuam ntawm kev sib txuas, qhia tias muaj zog ntawm kev sib txuas ntawm lub cev tsis muaj zog (Daim duab a thiab b). Hauv qhov sib piv, thaum pwm kub nce mus rau 260 degree thiab 280 degree, qhov tsis ua haujlwm ntawm PEEK / CCF-PAEK feem ntau yog vim qhov tawg ntawm interlaminar, qhia txog kev sib raug zoo ntawm kev sib raug zoo (Daim duab c thiab d).
Daim duab saum toj no qhia tau hais tias qhov kev tsis ua haujlwm ntawm cov ntu ntu ntawm SCF-PEEK / CCF-PAEK coated composites ntawm qhov sib txawv pwm kub, nrog rau cov qauv mob zoo ib yam li PEEK / CCF-PAEK cov khoom sib xyaw. Ntawm pwm kub ntawm 220 degree thiab 240 degree, interfacial bonding tsis ua hauj lwm tseem yog ib qho teeb meem loj (Daim duab a thiab b). Thaum cov pwm kub nce mus rau 260 degree thiab 280 degree, qhov tsis ua haujlwm ntawm SCF-PEEK / CCF-PAEK yog tus cwj pwm los ntawm interlaminar tawg ntawm CCF-PAEK thiab khoov tsis ua haujlwm ntawm SCF-PEEK (Daim duab c thiab d). Vim yog qhov khoov deformation thiab interlaminar shear deformation tshwm sim los ntawm txheej txheej txheej, thaum lub zog sib txuas ntawm lub ntsej muag tsis muaj zog, delamination tuaj yeem tshwm sim ntawm PEEK, SCF-PEEK, thiab CCF-PAEK. Raws li cov interfacial bonding zog nce, lub interfacial delamination nyob rau hauv cov composite maj mam txo, thaum interlaminar tawg ntawm cov resin nce.
Cov txiaj ntsig kev sim qhia tau hais tias qhov sib txawv ntawm qhov tsis ua haujlwm ntawm qhov sib xyaw hloov pauv nrog nce pwm kub. Thaum qhov kub thiab txias, qhov kub ntawm qhov sib txuas yog qis dua, thiab cov yaj hauv cov pwm txhaj tshuaj txias sai dua, ua rau qeeb molecular diffusion thiab tsis muaj zog adhesion. Shear tsis ua hauj lwm manifests li interfacial tsis ua hauj lwm, characterized los ntawm mechanical bonding. Raws li pwm kub nce, qhov tawg ntawm qhov chaw ntawm PEEK maj mam nce. Cov pwm kub siab dua nce qhov kub ntawm qhov sib txuas ntawm PEEK resin thiab PAEK, nce lub sij hawm sib xyaw ua ntej kho, uas ua rau cov txheej txheem melting ntawm cov resin. Thaum qhov kub ntawm qhov sib cuam tshuam ntau tshaj qhov kub ntawm PAEK, cov ntaub ntawv eutectic txheej txheej ntawm qhov sib cuam tshuam, txhim kho qhov sib txuas ntawm lub zog.
4.Nanoindentation Load-Depth Curves ntawm Coated Composites ntawm txawv pwm kub: Cov curves nyob rau hauv daim duab saum toj no qhia tau hais tias rau tib lub indentation load, lub indentation qhov tob yuav maj mam txo nrog nce pwm kub, qhia hais tias lub load-bearing peev xwm ntawm cov resin ntawm lub interface muaj zog raws li pwm kub nce. Rau PEEK / CCF-PAEK kev sib xyaw, ntawm pwm kub ntawm 260 degree, lub peev xwm thauj khoom ntawm cov khoom siv sib txuas yog zoo ib yam li PEEK, qhia tias cov coated sib xyaw tau mus txog lub xeev ntawm molten resin sib xyaw nrog txheej txheej. resin (PEEK), ua tiav yuav luag zoo tib yam lub zog. Hauv kev sib piv rau PEEK, SCF-PEEK / CCF-PAEK cov khoom sib xyaw ua pov thawj ntau dua ntawm qhov sib cuam tshuam, tawm tswv yim tias qhov sib ntxiv ntawm cov pa roj carbon luv luv txhim kho cov resin ntawm qhov sib cuam tshuam, ua rau nws dais ntau dua.
Thaum lub indentation qhov tob me me, lub modulus sai txo nrog nce indentation qhov tob (Daim duab b), uas qhia ntau variation nyob rau hauv lub modulus nkhaus nyob rau theem no. Thaum qhov tob tshaj 250 nm, qhov ntsuas qhov ntsuas tau pib du nrog qhov tob zuj zus. Nyob rau hauv qhov tob tshaj 500 nm, lub modulus nkhaus yuav ruaj khov dua. Nyob rau ntawm pwm kub ntawm 220 degree, qhov tob-modulus nkhaus rau PEEK / CCF-PAEK coated composites yog tsis ruaj tsis khov, nrog ib tug qis modulus ntawm 4.2 GPa. Qhov no qhia tau hais tias ntawm qhov kub ntawm pwm ntawm 260 degree, cov yaj tuaj yeem tsim cov txheej txheem resin coexistence nrog cov khoom ntawm cov khoom ua ntej, uas ua rau muaj qhov sib piv piv rau PEEK.
Qhov tob-modulus nkhaus rau SCF-PEEK / CCF-PAEK coated composites yog tus du, qhia tias qhov sib ntxiv ntawm cov roj carbon fibers luv luv tuaj yeem txhim kho cov qauv ntawm cov resin ntawm lub interface. Raws li pwm kub nce, lub modulus kuj maj mam nce. Ntawm qhov kub ntawm pwm ntawm 260 degree, qhov nce yog qhov tseem ceeb, nce mus txog 5.5 GPa, uas cuam tshuam rau kev hloov pauv hauv lub xeev interfacial bonding ntawm qhov kub no. Qhov no qhia tau hais tias ob hom resins ntawm lub interface tuaj yeem yaj thiab tawg mus rau ib leeg. Tsis tas li ntawd, luv carbon fibers tuaj yeem embed lawv tus kheej nyob rau hauv cov txheej txheem interfacial thaum cov resin nyob rau hauv ib lub xeev molten, uas ua rau muaj kev nce hauv modulus.
