Uma itheyiphu ye-PTFE idinga ukuqeda ukushisa - isibonelo, ukuhlanganisa ingxenye yamandla kusinki wokushisa - ungqimba olunamathelayo kufanele lwenze izinto ezimbili ngesikhathi esisodwa: dlulisa ukushisa futhi ubambe uqine. Ukwengeza ama-thermal conductive fillers (i-alumina, i-boron nitride, njll.) kuthuthukisa ukuqhutshwa kwe-thermal kodwa cishe njalo kunciphisa ukunamathela.
Inselele iwukukhulisa ukudluliswa kokushisa kuyilapho ulahlekelwa ukunamathela okuncane ngangokunokwenzeka . Impendulo ilele kumapharamitha amathathu wokugcwalisa: usayizi wezinhlayiyana, umumo wezinhlayiyana, namaphesenti okulayisha.
I-Aokai PTFE isungule i-thermal conductive Amateyipu e-PTFE wezinto zikagesi nezezimboni. Lesi sihloko sichaza ukuthi usayizi wezinhlayiyana, i-morphology, nokulayisha kuthinta kanjani ukuhwebelana, kanye nendlela yokwenza ibhalansi engcono kakhulu.
Usayizi Wezinhlayiyana - I-Fine-Coarse Trade-Off
Usayizi wezinhlayiyana ulawula ukuthi izigcwalisi zakha kahle kangakanani inethiwekhi ebamba ukushisa nokuthi okunamathelayo kumanzisa kahle kangakanani indawo yokubopha.
1. Izinhlayiya ezinhle (i-nano kuya ku-submicron)
Umthelela oshisayo: Indawo ephezulu iholela ezindaweni eziningi zokuthintana nezinhlayiyana, kodwa futhi ukumelana nokushisa okuphakathi kobuso (ukuhlakazeka kwephonon). I-agglomeration enamandla ikhawulela ukuthuthukiswa kokusebenza.
Umthelela wokunamathela: Izinhlayiya ezinhle zimunca inani elikhulu le-resin nama-tackifiers, ziqinise ingcina. I-tack yokuqala yehla kakhulu. Ukugeleza kuyehla, kunciphisa ukumanzisa kuma-PTFE substrates aphansi-ubuso-phezulu → amandla ekhasi aphansi.
Isinqumo: Akuvamile ukusetshenziswa yedwa. Izigcwalisi ezinhle kakhulu zinikeza ukuzuza okushisayo okuncane kodwa zicekele phansi ukunamathela.
2. Izinhlayiya ezimahhadla (micron kuya kumashumi ama-microns)
Umthelela oshisayo: Amaphoyinti okuxhumana ambalwa kodwa izindlela ezinde zokuqhuba ukushisa ngakunye. Lapho enqwabelene eduze kogqinsi lokunamathelayo, anikeza ukuguquguquka okuhle kwendiza.
Umthelela wokunamathela: Indawo ephansi ikhangisa inhlaka encane, igcina ukuthamba okunamathelayo. Kodwa-ke, uma izinhlayiya ziwugqinsi noma zijiyile kunongqimba olunamathelayo (imvamisa engu-25-100 μm), zenza i-tape ibe roughen, zinciphise indawo yokubopha ephumelelayo, futhi zidale amaphuzu okugxilisa ingqondo.
Isinqumo: Isetshenziswa njengohlaka lwamathambo oluphambili, kodwa kufanele lube nobukhulu obungaphansi kogqinsi bokunamathela.
3. Isixazululo - ukuhlanganisa i-bimodal
Hlanganisa ama-coarse kanye nezinhlayiya ezincane ngezilinganiso ezithile. Izinhlamvu ezinhle zigcwalisa izikhala phakathi kwezinhlayiya ezimahhadla, zithola ukupakishwa okuseduze. Ngokulayishwa kokugcwalisa okufanayo kwesamba, ukuhlelwa kwe-bimodal kwandisa amaphuzu okuxhumana kwezinhlayiyana (ukuhanjiswa okungcono) noma, ngokunye, kufinyelela ekuqhubekiseni okuhlosiwe ngesigcwalisi esiphelele , okushiya isigaba esiqhubekayo se-resin ukuze kulondolozwe ukunamathela.
Isincomo se-Aokai PTFE : Okwesendlalelo sokunamathela esiwugqinsi esingu-50 μm, sebenzisa izinhlayiya ezimahhadla zika-20-30 μm ezihlanganiswe nezinhlayiya ezinhle zika-1-5 μm. Le ndlela ye-bimodal iyisihluthulelo sokulinganisa izakhiwo.
I-Particle Morphology - Isimo Sibaluleke Kakhulu
Izigcwalisi ezingezona eziyindilinga ziqondana ngesikhathi sokumboza nokomiswa, zithinta indiza edlula (i-Z-direction) ukuqhutshwa kokushisa nokunamathela.
1. Izigcwalisi eziyindilinga noma eziyisiyingi (isb., i-alumina eyindilinga)
Umphumela oshisayo: Isotropic. Izinhlayiya zinqwabelana kalula endaweni ewugqinsi, zilungele ukuqeda ukushisa kwendiza.
Umthelela wokunamathela: Izindawo ezibushelelezi azikuvimbeli ukugeleza kwe-resin. Igcina ukugeleza okubandayo kanye nokumanzisa kwendawo. Kuzo zonke izimo ekulayisheni okulinganayo, ama-sphere agcina ukunamathela okuhle kakhulu - ikakhulukazi i-tack yokuqala.
Inzuzo yebhalansi: Ukuhambisana okuphelele konke. Khulisa ukuzuza okushisayo kwe-Z-axis ngokulahleka okuncane kokunamathela.
2. Izigcwalisi ezingaqinile (isb, i-boron nitride, igraphene)
Umthelela oshisayo: Isici esiphezulu se-aspect ratio sinikeza ukuqhutshwa kwendiza okuhle kakhulu, kodwa ama-flakes aqondana ne-substrate, enikeza ukuthuthukiswa okuncane okudlula indiza - impofu kumateyipu e-PTFE adinga ukudluliswa kokushisa okuqondile.
Umthelela wokunamathela: Ama-flakes asebenza njengamafilimu ahlukanisayo, avimbe ukugeleza kwepulasitiki futhi asike kakhulu i-tack yokuqala. Imiphetho ecijile ibangela ukugxila kwengcindezi, kunciphisa amandla e-peel.
Ububi bebhalansi: Ukulingana okungalungile kwezidingo ezishisayo eziqondiswe ku-Z, kulimaza kakhulu ukunamathela okungokwemvelo. Akunconyiwe njengesigcwalisi esikhulu.
3. Izigcwalisi ezine-fibrous noma ezingajwayelekile
Umthelela oshisayo: I-aspect ratio ephezulu ingakha amanethiwekhi e-conductive ekulayisheni okuphansi.
Umphumela wokunamathela: Khulisa kakhulu i-viscosity yokunamathisela, qinisa i-PSA ngokuxhuma ngomshini, futhi ucekele phansi ukuqina. Imiphetho ebukhali ilimaza isixhumi esibonakalayo se-PTFE.
Isinqumo: Akuvamile ukusetshenziswa njengesigcwalisi esikhulu; isengezo esincane kuphela njengesisetshenziswa sokuhlanganisa ibhuloho.
I-Filler Loading - Ukuthola Indawo Emnandi Ye-Percolation
Njengoba ukulayishwa kwesigcwalisi kukhula, ukuqhutshwa kwe-thermal kuphakama kancane ekuqaleni, bese kweqa kakhulu embundwini we-percolation , bese kuba ngamathafa. Ukunamathela, nokho, kwehla ngokuqhubekayo.
1. Ukulayisha okuphansi (<30 vol%)
Amafayili ayiziqhingi ezingazodwa ku-matrix ye-resin eqhubekayo. I-thermal conductivity ayithuthuki kancane. Ukunamathela kuhlala kuseduze ne-PSA emsulwa. Indawo ephephile yokugcina i-tack, kodwa ukuzuza okushisayo akunakwa.
2. Ukulayisha okuphakathi kuya phezulu (30-60 vol%) - iwindi elibalulekile
Izinhlayiya ziqala ukuthinta futhi zenze izindlela ezisebenzayo. I-Thermal conductivity ikhuphuka kakhulu. Ngaleso sikhathi, i-resin matrix eqhubekayo iba yizicucu. I-Adhesive iphenduka ibe brittle; i-tack yokuqala namandla e-peel ehla kakhulu.
Lena indawo yokuthuthukisa. Umgomo uwukusebenza ekugcineni okuphansi komkhawulo we-percolation - ukuphakama ngokwanele ukuhlangabezana ne-thermal specs, ephansi ngokwanele ukuze kugcinwe isigaba se-resin esiqhubekayo sokunamathela okwamukelekayo.
3. Ukulayisha okuphezulu kakhulu (>60 vol%)
Ukupakishwa kwezinhlayiyana eziminyene kunciphisa ukwanda okushisayo (ithafa). I-resin ayikwazi ukugcwalisa zonke izikhala; ifomu le-voids. I-Adhesive iba yomile, ibe brittle, futhi icishe ingabi-tacky. I-tape iba ifilimu eshisayo ebuthakathaka. Ibhalansi yendawo ilahleka ngokuphelele.
Inothi elikhethekile letheyiphu ye-PTFE (i-silicone PSA): I-Silicone inamandla okuhlangana aphansi futhi ihambisana kahle nesigcwalisi kune-acrylic. Ibekezelela ukulayishwa kokugcwalisa okuphezulu okuphansi. Ukugcwala ngokweqile kubangela ukugoqa okunamathelayo.
Idatha ye-Aokai PTFE empirical : Ku-alumina eyindilinga ku-silicone PSA, i-percolation threshold icishe ibe ngu-35-45 vol%. Ibhalansi ekahle ifinyelelwa cishe ku-40-45 vol% ngokusatshalaliswa kwe-bimodal. Ngaphezu kuka-55 vol%, ukunamathela kuba okungamukeleki ezinhlelweni eziningi.
Ukuze kuzuzwe ibhalansi ye-thermal conduction-adhesion ezinzile kumatheyipu okunamathela okushisa okuphezulu kwe-PTFE:
Sebenzisa izinhlayiya eziyindilinga eziyisiyingi (20-30 μm) njengohlaka lwamathambo oluyinhloko - zihlinzeka ngokuqhutshwa kwendiza ngokulahlekelwa okuncane kokunamathela.
Engeza izinhlayiya ezinhle (1-5 μm) ukuze udale ukusatshalaliswa kwe-bimodal - igcwalisa i-voids, inciphisa isigcwalisi esiphelele esidingekayo, igcina i-resin matrix.
Gcina isamba sokulayishwa kwesigcwalisi ebangeni eliphansi-maphakathi le-percolation threshold (cishe 40-45 vol% we-alumina eyindilinga ku-silicone PSA).
Nciphisa ama-fibrous fillers abe ngu-<5 wt% uma kudingeka nhlobo - alimaza i-tack futhi anikeze inzuzo encane yokuhamba ngendiza.
Umphumela: Itheyiphu ye-PSA ye-thermally conductive enamathela futhi ehlala njalo.
I-Aokai PTFE ikhiqiza amateyipu e-PTFE ahambisa ukushisa isebenzisa lelisu le-bimodal spherical filler. Singakwazi ukuhlanganisa ukuguquguquka kwe-thermal kanye namazinga okunamathela kuhlelo lwakho lokusebenza.
I-Takeaway yokugcina
Ukuthuthukisa ukusebenza okushisayo kumateyipu okunamathela we-PTFE kuhlale kulwa nokunamathela. Ukunciphisa okuhle kakhulu kuvela ezinhlayiyeni eziyindilinga + ukusatshalaliswa kosayizi we-bimodal + ukulayisha i-percolation edlule nje . Gwema ama-flakes nama-fibers ngaphandle uma uhlelo lwakho lokusebenza ludinga ngokuqondile ukuqhutshwa kwendiza futhi lungakwazi ukubekezelela i-tack ephansi.
Ngokusebenza okuphezulu kokubopha nokukhishwa kokushisa, itheyiphu ye-PTFE ehambisa ukushisa iyisixazululo esifakazelwe. Xhumana ne -Aokai PTFE ukuze uthole ukwakheka okufaniswa nezidingo zakho ezishisayo nekhasi.
Okuqukethwe kobuchwepheshe kuhlinzekwe ngu I-Jiangsu Aokai New Materials Technology Co., Ltd.
Ukuze uthole imininingwane eningiliziwe nezixazululo ezenziwe ngokwezifiso ze-PTFE zezindwangu zezinga lokushisa eliphezulu, amateyipu, amabhande anezikhala, nokuningi:
Ngokuhambisana nobungcweti nobuqotho, sihlinzeka ngezixazululo ezenziwe ngokwezifiso zokuma okukodwa kanye nezinsizakalo ezicabangelayo zangemuva kokuthengisa.
