Xa itheyiphu ye-PTFE idinga ukutshabalalisa ukushisa - umzekelo, ukudibanisa icandelo lamandla kwi-heat sink - i-adhesive layer kufuneka yenze izinto ezimbini ngexesha elinye: ukudlulisa ubushushu kwaye ubambe ngokuqinileyo. Ukongeza i-thermal conductive fillers (i-alumina, i-boron nitride, njl.) iphucula i-thermal conductivity kodwa phantse isoloko inciphisa ukunamathela.
Umceli mngeni kukwandisa ukugqithiswa kobushushu ngelixa uphulukana nokuncamathela okuncinci kangangoko kunokwenzeka . Impendulo ilele kwiiparamitha ezintathu zokuzalisa: ubungakanani besuntswana, ubume besuntswana, kunye nepesenti yokulayisha.
I-Aokai PTFE iphuhlise i-thermal conductive Iiteyiphu ze-PTFE zombane kunye nezicelo zemizi-mveliso. Eli nqaku lichaza indlela ubungakanani be-particle, i-morphology, kunye nokulayisha okuchaphazela ngayo ukurhweba, kunye nendlela yokuqulunqa ibhalansi engcono.
Ubungakanani beNcam - URhwebo oluNcinciweyo
Ubungakanani besuntswana bulawula indlela izizalisi ezenza ngayo inethiwekhi eqhuba ubushushu kwaye incamathela imanzisa njani umphezulu wokubopha.
1. Amasuntswana amahle (nano ukuya kwi-submicron)
Umphumo we-Thermal: Ummandla ophezulu ukhokelela kwiindawo ezininzi zokudibanisa i-particle-particle, kodwa kunye nokuchasana kwe-thermal interfacial (i-phonon scattering). Imida yeagglomeration enzima yokuphucula ukuhanjiswa.
Impembelelo yokubambelela: Iincinci ezincinci zithatha inani elikhulu le-resin kunye ne-tackifiers, lukhuni i-adhesive. Inyathelo lokuqala liyehla ngokukhawuleza. Ukuqukuqela kuyehla, kunciphisa ukumanzisa kumhlaba-ophantsi wamandla e-PTFE substrates → amandla amaxolo aphantsi.
Isigqibo: Ayifane isetyenziswe yodwa. Izigcwalisi ezicolekileyo kakhulu zinika inzuzo yomda oshushu kodwa zitshabalalise ukunamathela.
2. Amasuntswana arhabaxa (micron ukuya kumashumi eemicrons)
Ifuthe le-Thermal: Iindawo zoqhagamshelwano ezimbalwa kodwa iindlela ezinde zokuqhuba ubushushu. Xa zipakishwe ngokusondeleyo ecaleni kobukhulu bokuncamathelisa icala, zinika i-conductivity elungileyo ngenqwelomoya.
Isiphumo sokuncamathela: Indawo esezantsi ibhengeza i-resin encinci, igcina ukuthamba okunamathelayo. Nangona kunjalo, ukuba amasuntswana angqindilili okanye angqindilili kunomaleko wokuncamathelisa (ngokuqhelekileyo yi-25-100 μm), arhabaxa umphezulu weteyiphu, anciphise indawo esebenzayo yokudibanisa, kwaye enze iindawo zoxinzelelo.
Isigqibo: Isetyenziswa njengowona mathambo aphambili aqhubayo, kodwa kufuneka alingane ngezantsi kobunzima bokuncamathelisa.
3. Isisombululo - ukudibanisa i-bimodal
Hlanganisa i-coarse kunye namaqhekeza amancinci kwimilinganiselo ethile. Iinkozo ezintle zigcwalisa i-voids phakathi kweengqungquthela ezinqabileyo, ukufezekisa ukupakisha okusondeleyo. Ngomthwalo ofanayo wokugcwaliswa okupheleleyo, ukuhlelwa kwe-bimodal kwandisa iindawo zoqhagamshelwano ze-particle (i-conductivity engcono) okanye, ngenye indlela, ifikelela kwi-conductivity ekujoliswe kuyo kunye ne -filler encinci , ishiya isigaba esiqhubekayo se-resin ukugcina ukunamathela.
Ingcebiso ye-Aokai PTFE : Kwi-50 μm ye-adhesive layer, sebenzisa amasuntswana arhabaxa we-20-30 μm adityaniswe namasuntswana amahle e-1-5 μm. Le ndlela ye-bimodal iyisitshixo sokulinganisa iimpawu.
I-Paticle Morphology - Ubume bubaluleke kakhulu
Iifayili ezingabonakaliyo zilungelelanisa ngexesha lokugquma kunye nokomisa, ezichaphazela nge-plane (Z-direction) i-thermal conductivity kunye nokubambelela.
1. Izigcwalisi ezingqukuva okanye ezingqukuva (umzekelo, ialumina engqukuva)
Impembelelo yeThermal: Isotropic. Iisuntswana zinamathelana ngokulula ecaleni kobungqingqwa, zilungele ukutshabalalisa ubushushu kwinqwelomoya.
Isiphumo sokuncamathela: Imiphezulu egudileyo ayikuthinteli ukuhamba kweresin. Igcina ukuhamba okubandayo kunye nokumanzisa komphezulu. Phakathi kwazo zonke iimilo ekulayisheni okulinganayo, ii-spheres zigcina eyona incamathelayo - ngakumbi i-tack yokuqala.
Inzuzo yokulinganisela: Eyona nto ihambelanayo iyonke. Yandisa inzuzo ye-Z-axis ye-thermal kunye nelahleko encinci yokubambelela.
2. Izihluzi ezithambileyo (umzekelo, i-boron nitride, igraphene)
Ifuthe le-Thermal: Umgangatho ophezulu we-aspect ratio unika i-conductivity egqwesileyo kwinqwelomoya, kodwa iiflakes zilungelelaniswa ngokunxusene ne-substrate, inika uphuculo oluncinci lwenqwelomoya-imbi kwiiteyiphu ze-PTFE ezifuna ukuhanjiswa kobushushu obuthe nkqo.
Impembelelo yokuncamathela: Iiflekhi zisebenza njengeefilimu zokwahlulahlula, zithintela ukuhamba kweplastiki kunye nokusika kakhulu iteki yokuqala. Imiphetho ebukhali ibangela uxinzelelo, ukunciphisa amandla e-peel.
I-balance disadvantage: Ukungalungeli kakuhle iimfuno ze-thermal ze-Z, yonakalisa kakhulu ukuncamathela kwendalo. Ayikhuthazwa njengesizalisi esiphambili.
3. Fibrous okanye iregular fillers
Impembelelo ye-Thermal: Umlinganiselo ophezulu unokwakha uthungelwano oluqhubayo ekulayisheni okuphantsi.
Isiphumo sokuncamathela: Yandisa kakhulu i-viscosity encamathelayo, yenza i-PSA ibe lukhuni ngokunxibelelanisa ngoomatshini, kwaye utshabalalise ubunyani. Imiphetho ebukhali yonakalisa i-adhesive-PTFE ujongano.
Isigqibo: Ayifane isetyenziswe njengeyona nto iphambili yokuzalisa; ukongeza okuncinci kuphela njengesixhobo sokudibanisa.
Ukulayishwa kweFiller-Ukufumana iPercolation Sweet Spot
Njengoko ukulayishwa kwesihluzi kusanda, i-thermal conductivity inyuka kancinci ekuqaleni, emva koko itsibe kabukhali kumda we-percolation , emva koko i-plateaus. Ukunamathela, nangona kunjalo, kuyancipha ngokuqhubekayo.
1. Ukulayisha okuphantsi (<30 vol%)
Iifayile ziziqithi ezizimeleyo kwi-matrix ye-resin eqhubekayo. I-Thermal conductivity iphucula kancinci. Ukubambelela kuhlala kufutshane nePSA ecocekileyo. Indawo ekhuselekileyo yokugcina iteki, kodwa inzuzo yobushushu ayihoyekanga.
2. Ukulayisha okuphakathi ukuya phezulu (30-60 vol%) - ifestile ebalulekileyo
Amalungu aqala ukubamba kwaye enze iindlela zokuqhuba. I-Thermal conductivity iphakama ngokukhawuleza. Okwangoku, i-matrix ye-resin eqhubekayo iyahlukana. I-Adhesive ijika ibe brittle; i-tack yokuqala kunye namandla e-peel ehle kakhulu.
Lo ngummandla wokulungiselela. Injongo kukusebenza kwinqanaba elisezantsi le-percolation threshold - liphezulu ngokwaneleyo ukuhlangabezana ne-thermal specs, ephantsi ngokwaneleyo ukugcina isigaba esiqhubekayo se-resin sokubambelela okwamkelekileyo.
3. Ukulayisha okuphezulu kakhulu (>60 vol%)
Ukupakishwa kwamasuntswana ashinyeneyo kunciphisa ukuzuza ngakumbi kwe-thermal (i-plateau). I-resin ayikwazi ukuzalisa zonke izikhewu; ifom ye-voids. I-Adhesive iba yomile, i-brittle, kwaye iphantse ingabina-tacky. I-tape iba yifilimu enqabileyo ye-thermal. Ibhalansi yepropati ilahlekile ngokupheleleyo.
Inqaku elikhethekileyo le-PTFE tape (i-silicone PSA): I-Silicone inamandla okubambisana aphantsi kunye nokuhambelana nokuzalisa okungahambi kakuhle kune-acrylic. Inyamezela ukulayishwa kwesihluzi esisezantsi. Ukuzaliswa ngokugqithisileyo kubangela ukuncamatheliswa kwe-adhesive.
I-Aokai PTFE idatha yobungqina : Kwi-alumina engqukuva kwi-silicone ye-PSA, i-percolation threshold yi-35-45 vol%. Ibhalansi efanelekileyo ifunyenwe malunga ne-40-45 vol% kunye nokusabalalisa i-bimodal. Ngaphezulu kwe-55 yevolthi%, ukuncamatheliswa akuvumelekanga kuninzi lwezicelo.
Ukufezekisa i-thermal conduction-adhesion balance in PTFE high-temperature adhesive tapes:
Sebenzisa i-spherical coarse particles (20-30 μm) njengeyona skeleton yokuqhubela phambili - ibonelela nge-conductivity yenqwelomoya kunye nelahleko encinci yokubambelela.
Yongeza iincinci ezintle (i-1-5 μm) ukudala ukusabalalisa kwe-bimodal - igcwalisa i-voids, iyanciphisa i-filler epheleleyo efunekayo, igcina i-resin matrix.
Gcina ukulayishwa kwe-filler kuluhlu olusezantsi lwe-percolation threshold (malunga ne-40-45 vol% ye-alumina ye-spherical kwi-silicone PSA).
Nciphisa izigcwalisi ezithambileyo okanye ezinefibrous ukuya ku-<5 wt% ukuba ziyafuneka kuzo zonke – zenzakalisa i-tack kwaye zibonelele ngenzuzo encinci ngenqwelomoya.
Isiphumo: Iteyiphu yePSA enethermally encamathelayo kwaye ihlala.
I-Aokai PTFE yenza iiteyiphu ze-PTFE eziqhuba ngokufudumeleyo isebenzisa esi sicwangciso-qhinga sokuzalisa esingqukuva se-bimodal. Sinokwenza i-thermal conductivity kunye namanqanaba okubambelela kwisicelo sakho.
Ukuthathwa kokugqibela
Ukuphucula i-thermal conductivity kwi-PTFE iiteyiphu zokubambelela zihlala zilwa nokubambelela. Olona lungelelwaniso luvela kumasuntswana angqukuva + ubungakanani besayizi ye-bimodal + ukulayisha nje i-percolation edlulileyo . Ziphephe iiflakes kunye neefayibha ngaphandle kokuba isicelo sakho sidinga ngokukodwa i-in-plane conductivity kwaye inokunyamezela i-tack ephantsi.
Kwi-high-performance bonding kunye nokuchithwa kobushushu, i-PTFE tape ye-thermal conductive sisisombululo esiqinisekisiweyo. Qhagamshelana ne -Aokai PTFE malunga nemixube ehambelana neemfuno zakho ze-thermal kunye namaxolo.
Umxholo wobugcisa onikezelwe ngu I-Jiangsu Aokai yeZixhobo eziNtsha zeTekhnoloji Co., Ltd.
Ukufumana iinkcukacha ezithe kratya kunye nezisombululo zesiko le-PTFE amalaphu obushushu obuphezulu, iiteyiphu, amabhanti e-mesh, kunye nokunye:
Ukubambelela kubuchwephesha kunye nemfezeko, sinikezela ngezisombululo ezilungelelanisiweyo zokuphela kunye kunye neenkonzo ezicingayo emva kokuthengisa.
