Kuyanjanitsa Matenthedwe a Matenthedwe ndi Kumamatira mu PTFE High-Temperature Adhesive Tepi

Pamene tepi ya PTFE ikufunika kutaya kutentha - mwachitsanzo, kumangiriza gawo la mphamvu ku kutentha kwa kutentha - zomatira ziyenera kuchita zinthu ziwiri nthawi imodzi: kutengera kutentha ndikugwira mwamphamvu. Kuonjezera matenthedwe opangira matenthedwe (alumina, boron nitride, etc.) kumapangitsa kuti matenthedwe apangidwe koma pafupifupi nthawi zonse amachepetsa kumamatira.

Chovuta ndi kukulitsa kutentha kwa kutentha kwinaku mukutaya kukakamira pang'ono momwe mungathere . Yankho lili m'magawo atatu odzaza: kukula kwa tinthu, mawonekedwe a tinthu, ndi kuchuluka kwake.

Aokai PTFE yapanga thermally conductive PTFE matepi zamagetsi ndi mafakitale ntchito. Nkhaniyi ikufotokoza momwe kukula kwa tinthu, morphology, ndi kutsitsa kumakhudzira malonda, komanso momwe angapangire kuti zikhale bwino.

Kukula kwa Particle - The Fine-Coarse Trade-Off

Kukula kwa tinthu ting'onoting'ono kumayang'anira momwe zomangira zimapangidwira bwino maukonde oyendetsa kutentha komanso momwe zomatira zimanyowetsa bwino malo omangira.

1. Tinthu tating'ono (nano to submicron)

• Kutentha kwamafuta: Malo okwera kwambiri amatsogolera kumalo okhudzana ndi tinthu tating'onoting'ono, komanso kukana kutentha kwapakati (kubalalika kwa phonon). Kuphatikizika kwakukulu kumalepheretsa kusintha kwa conductivity.

• Zomatira: Tinthu tating'onoting'ono timayamwa utomoni wochulukirapo ndi zomata, ndikuumitsa zomatira. Mphuno yoyambira imachepa kwambiri. Kuyenda kumachepa, kumachepetsa kunyowetsa pamagulu otsika amphamvu a PTFE → mphamvu yotsika ya peel.

• Chigamulo: Sichigwiritsidwa ntchito kawirikawiri. Zodzaza bwino kwambiri zimapatsa phindu pang'ono kutentha koma zimawononga kumamatira.

2. Tinthu tating'onoting'ono (micron mpaka makumi a ma microns)

• Thermal effect: Malo ochepa olumikizirana koma njira zazitali zapayekha kutentha. Zikasungidwa moyandikana motsatira makulidwe a zomatira, zimapereka kuwongolera bwino kwa ndege.

• Kumamatira: Malo otsika amatsitsa utomoni wocheperako, kusunga kufewa kwa zomatira. Komabe, ngati tinthu tating'onoting'ono ngati kapena tokulirapo kuposa zomatira (nthawi zambiri 25-100 μm), zimakwiyitsa tepiyo, zimachepetsa malo omangirira, ndikupanga malo olimbikira.

• Chigamulo: Amagwiritsidwa ntchito ngati mafupa opangira ma conductive, koma ayenera kukula pansi pa makulidwe a zomatira.

3. Yankho - kusakanikirana kwa bimodal

Sakanizani tinthu tating'onoting'ono tokhala ndi ma coarse ndi abwino pazigawo zina. Njere zabwino zimadzaza ma voids pakati pa tinthu tating'onoting'ono, ndikukwaniritsa kulongedza kwapafupi. Ndi kudzaza kokwanira kofananako, kuyika kwa bimodal kumawonjezera malo olumikizirana ndi tinthu (madulidwe abwino) kapena, m'malo mwake, amafika pamadulidwe omwe mukufuna ndi zodzaza zochepa , ndikusiya gawo lopitilira la utomoni kuti lisunge zomatira.

Malingaliro a Aokai PTFE : Kwa 50 μm wandiweyani zomatira wosanjikiza, gwiritsani ntchito tinthu tating'onoting'ono ta 20-30 μm tophatikizidwa ndi tinthu tating'ono ta 1-5 μm. Njira iyi ya bimodal ndiyo chinsinsi cha kusanja katundu.

Particle Morphology - Maonekedwe Amafunika Kwambiri

Ma filler osakhala ozungulira amalumikizana pakuyala ndi kuyanika, zomwe zimakhudza kupitilira ndege (Z-direction) matenthedwe matenthedwe ndi kumamatira.

1. Zodzaza zozungulira kapena quasi-spherical (mwachitsanzo, aluminiyamu yozungulira)

• Kutentha kwamphamvu: Isotropic. Tinthu tating'ono ting'onoting'ono timawunjika mosavuta motsatira makulidwe ake, zomwe ndi zabwino kuti zitha kutenthetsa mu ndege.

• Zomata: Malo osalala samalepheretsa kutuluka kwa utomoni. Imateteza kuzizira komanso kunyowetsa pamwamba. Pakati pa mawonekedwe onse pakukweza kofanana, zigawo zimasunga zomatira zabwino kwambiri - makamaka zoyambira.

• Ubwino wokwanira: Kugwirizana kwabwino konse. Imakulitsa kutenthetsa kwa Z-axis ndikutayika pang'ono kumamatira.

2. Mafila osalala (monga boron nitride, graphene)

• Kutentha kotentha: Chiŵerengero chapamwamba chimapereka kusinthasintha kwabwino kwa ndege, koma ma flakes amafanana ndi gawo lapansi, zomwe zimapereka kusintha pang'ono kupyolera mu ndege - zosakwanira matepi a PTFE omwe amafunikira kutentha kutentha.

• Kumamatira: Ma flakes amachita ngati mafilimu ogawa, kutsekereza kutuluka kwa pulasitiki ndikudula kwambiri zoyambira. Mphepete zakuthwa zimabweretsa kupsinjika, kumachepetsa mphamvu ya peel.

• Kuipa kokwanira: Kusakwanira pazofunikira za Z-direction thermal, kumawononga kwambiri kumamatira kwachilengedwe. Osavomerezeka ngati chodzaza chachikulu.

3. Fibrous kapena osasamba fillers

• Kutentha kwamafuta: Chiŵerengero chapamwamba chimatha kupanga maukonde ochititsa chidwi pakutsitsa kochepa.

• Zomatira: Onjezani kukhuthala komatira, kulimbitsa PSA kudzera pamakina olumikizirana, ndikuwononga mphamvu. Mphepete zakuthwa zimawononga mawonekedwe a zomatira-PTFE.

• Chigamulo: Osagwiritsidwa ntchito ngati chodzaza chachikulu; kungowonjezera pang'ono ngati zida zomangira.

Filler Loading - Kupeza Percolation Sweet Spot

Pamene kudzaza kwa filler kukuchulukirachulukira, matenthedwe amatenthetsa amakwera pang'onopang'ono poyamba, kenako amalumpha kwambiri pamtunda wa percolation , kenako kumapiri. Kumamatira, komabe, kumatsika mosalekeza.

1. Kutsitsa kochepa (<30 vol%)

Zodzaza ndi zilumba zakutali mu matrix opitilira utomoni. Thermal conductivity sikuyenda bwino. Kumamatira kumakhalabe pafupi ndi PSA yoyera. Malo otetezeka osungira ma tack, koma matenthedwe amachepa.

2. Kutsegula kwapakatikati (30-60 vol%) - zenera lovuta

Tinthu tating'onoting'ono timayamba kugwirana ndikupanga njira zoyendetsera. Thermal conductivity imakwera kwambiri. Pakadali pano, matrix opitilira utomoni amakhala ogawanika. Zomatira zimasanduka brittle; mphamvu ya peel ndi kutsitsa koyamba kumatsika kwambiri.

Awa ndiye malo okhathamiritsa. Cholinga chake ndikugwira ntchito kumapeto kwa gawo la percolation - yokwera mokwanira kuti igwirizane ndi matenthedwe, otsika mokwanira kuti asunge gawo lopitirira la utomoni wovomerezeka.

3. Kukweza kwambiri (> 60 vol%)

Kulongedza tinthu tating'onoting'ono kumachepetsa kuwonjezereka kwamafuta (plateau). Utomoni sungathe kudzaza mipata yonse; mawonekedwe a voids. Zomatira zimakhala zowuma, zonyezimira, komanso pafupifupi zopanda tacky. Tepiyo imakhala filimu yotentha yotentha. Kuchuluka kwa katundu kumatayika kwathunthu.

Chidziwitso chapadera cha tepi ya PTFE (silicone PSA): Silicone ili ndi mphamvu yolumikizana yocheperako komanso kugwirizana kocheperako kodzaza kuposa acrylic. Imalekerera kutsitsa kwamafuta ochepa kwambiri. Kudzaza kwambiri kumayambitsa zomatira pulverization.

Aokai PTFE epirical data : Kwa aluminiyamu yozungulira mu silikoni PSA, chigawo cha percolation ndi pafupifupi 35-45 vol%. Mulingo woyenera kwambiri umatheka mozungulira 40-45 vol% ndi kugawa kwa bimodal. Pamwamba pa 55 vol%, kumamatira kumakhala kosavomerezeka pamapulogalamu ambiri.

Chidule Chachidule - Njira Yosanja Atatu-mu-Mmodzi

Kuti mukwaniritse kukhazikika kwa kutentha kwa conduction-adhesion mu PTFE matepi omatira otentha kwambiri:

1. Gwiritsani ntchito tinthu tating'onoting'ono tozungulira (20-30 μm) ngati mafupa oyamba oyendetsa - amapereka madutsidwe apandege omwe amatayika pang'ono.

2. Onjezani tinthu tating'onoting'ono (1-5 μm) kuti mupange kugawa kwa bimodal - imadzaza ma voids, imachepetsa zodzaza zonse zofunika, imasunga matrix a utomoni.

3. Sungani zodzaza zonse pamunsi-pakati pa percolation (mozungulira 40-45 vol% ya aluminiyamu yozungulira mu silicone PSA).

4. Chepetsani zodzaza zosalala kapena zafibrous ku <5 wt% ngati zingafunike - zimawononga ma tack ndipo zimapindulitsa pang'ono kudzera mundege.

Chotsatira: Tepi ya PSA yotentha kwambiri yomwe imamatira ndikukhalitsa.

Aokai PTFE imapanga matepi a PTFE otenthetsera pogwiritsa ntchito njira iyi ya bimodal spherical filler. Titha kusintha ma conductivity amafuta ndi ma adhesion kuti agwirizane ndi ntchito yanu.

Final Takeaway

Kupititsa patsogolo kutentha kwa matenthedwe mu matepi omatira a PTFE nthawi zonse kumalimbana ndi kumamatira. Kunyengerera kwabwino kwambiri kumachokera ku tinthu tozungulira + kukula kwa bimodal + kutsitsa zomwe zangochitika kale . Pewani ma flakes ndi ma fiber pokhapokha ngati pulogalamu yanu ikufunika kuwongolera ndege ndipo imatha kupirira kutsika kochepa.

Pamalumikizano apamwamba kwambiri ndi kutentha kwapang'onopang'ono, tepi ya PTFE yochititsa chidwi ndi yankho lotsimikizika. Lumikizanani ndi Aokai PTFE pamapangidwe ogwirizana ndi zomwe mukufuna kutenthetsa ndi peel.

Zaukadaulo zoperekedwa ndi Malingaliro a kampani Jiangsu Aokai New Materials Technology Co., Ltd.

Kuti mudziwe zambiri komanso njira zothetsera PTFE nsalu zotentha kwambiri, matepi, malamba a mauna, ndi zina zambiri:

• Bambo Guo: +86 18944819998

• Bambo Liu: + 86 13705266308

Kutsatira ukatswiri ndi umphumphu, timapereka mayankho okhazikika amodzi ndi ntchito zoganizira pambuyo pogulitsa.