PTFE tape hian lumna a tihbo a ngaih hunah – entirnan, power component chu heat sink-ah a bonding a nih chuan – adhesive layer hian vawi khatah thil pahnih a ti tur a ni: transfer heat leh hold tight. Thermally conductive fillers (alumina, boron nitride, etc.) dah belh hian thermal conductivity a ti tha a, mahse adhesion a ti tlem deuh ber.
Challenge chu a theih ang anga stickiness tlem thei ang bera hloh chungin heat transfer tihpun hi a ni . A chhanna chu filler parameter pathum-ah a awm a, chungte chu particle size, particle shape, leh loading percentage te an ni.
Aokai PTFE hian thermal conductive a siam chhuak a PTFE tape te . Electronics leh industrial application atana hman tur He thuziak hian particle size, morphology leh loading te hian trade-off a nghawng dan te, balance tha ber tur formulate dan te a sawifiah a ni.
Particle Size – A rilru a buai em em a, a rilru a hah em em bawk a
Particle size hian fillers te hian heat-conducting network an siam that dan leh adhesive hian bonding surface a wet that dan a thunun a ni.
1. Thil chi hrang hrang (nano atanga submicron) .
Thermal effect: Surface area sang hian particle-particle contact point tam zawk a thlen a, mahse interfacial thermal resistance (phonon scattering) a tam zawk bawk. Agglomeration na tak chuan conductivity tihchangtlunna a tikhawtlai.
Adhesion effect: Fine particles hian resin leh tackifiers tam tak a hip lut a, adhesive chu a tikhauh a ni. Initial tack chu a tlahniam nasa hle. Flowability a tlahniam a, low-surface-energy PTFE substrate-a wetting tihtlem → peel strength hniam.
Thutlukna: Amah chauha hman a ni lo. Ultra-fine fillers hian marginal thermal gain a pe a, mahse adhesion a tichhia thung.
Thermal effect: Contact point tlem zawk mahse mimal heat conduction path sei zawk. Adhesive thickness direction-a hnaih taka an stack chuan through-plane conductivity tha tak an pe thin.
Adhesion effect: Surface area hniam hian resin a adsorb tlem a, adhesive softness a humhim. Mahse, particle te chu adhesive layer ang vel emaw, a thuk zawk emaw (a tlangpuiin 25-100 μm) a nih chuan tape surface chu a roughen a, effective bonding area a tihtlem a, stress concentration point a siam bawk.
Thutlukna: Primary conductive skeleton atan hman a ni a, mahse adhesive thickness hnuai lam size a ni tur a ni.
3. A solution – bimodal blending a ni
Coarse leh fine particle te chu ratio bik ah mix rawh. Fine grains hian coarse particles inkar voids chu a luah khat a, closest packing a ti thei a ni. Total filler loading inang chiah hian bimodal grading hian particle contact point (conductivity tha zawk) a tipung a, a danglamna chu, hmangin target conductivity a thleng a total filler tlem zawk , adhesion humhim turin resin phase chhunzawm zel tam zawk a awmtir bawk.
Aokai PTFE rawtna : Adhesive layer 50 μm thick atan chuan coarse particle 20-30 μm vel blended leh fine particle 1-5 μm te hman tur a ni. He bimodal approach hi property inthlauhna atana pawimawh ber a ni.
Particle Morphology – A pianzia hi a pawimawh hle
Non-spherical fillers te hi coating leh drying laiin an align a, through-plane (Z-direction) thermal conductivity leh adhesion te a nghawng a ni.
1. Spherical emaw quasi-spherical emaw filler (eg, spherical alumina) 1. A rilru a hah lutuk chuan a rilru a buai em em a.
A rilru a buai em em a, a rilru a hah em em bawk a. Isotropic. Particle te hi thickness lam hawiin awlsam takin an stack a, through-plane heat dissipation atan a tha hle.
Adhesion effect: A chung lam hrual chuan resin flow a tikhawlo lo. Cold-flow leh surface wetting a humhim. Loading inangah shape zawng zawng zingah sphere te hian adhesion tha ber an vawng reng a – a bik takin initial tack.
Balance advantage: A pum puia inmilna tha ber. Z-axis thermal gain a ti sang a, adhesion loss tlem ber a nei bawk.
2. Filler flaky (eg, boron nitride, graphene) te chu a hring chhuak thin.
Thermal effect: Aspect ratio sang chuan in-plane conductivity tha tak a pe a, mahse flakes te chu substrate nen parallel in an align a, through-plane improvement tlemte chauh a pe a – vertical heat transfer mamawh PTFE tape tan chuan a tha lo.
Adhesion effect: Flakes hian partition film angin hna a thawk a, plastic flow a tikhawlo a, initial tack pawh nasa takin a titawp bawk. Sharp edges hian stress concentration a siam a, peel strength a ti tlem bawk.
Balance chhiatna: Z-direction thermal mamawhna atana fit tha lo, inherent stickiness nasa takin a tichhe. Main filler atan a tha lo.
3. Fibrous emaw, filler mumal lo emaw
Thermal effect: Aspect ratio sang chuan loading hniam takah conductive network a siam thei.
Adhesion effect: Adhesive viscosity nasa takin a tipung a, mechanical interlocking hmangin PSA a tikhauh a, tackiness a tichhia bawk. Sharp edges hian adhesive-PTFE interface a tichhia a ni.
Thutlukna: Main filler atan hman a tlem hle; auxiliary bridging material atan minor addition chauh a ni.
Filler loading a san chuan thermal conductivity chu a tir lamah a sang zawi zawi a, chutah percolation threshold -ah nasa takin a zuang a , chutah chuan plateaus-ah a zuang leh bawk. Adhesion erawh chu a tlahniam zel thung.
1. Loading hniam (<30 vol%) .
Fillers hi resin matrix kal zelah island hrang hrang (isolated islands) a ni. Thermal conductivity a tha lo hle. Adhesion hi PSA thianghlim nen a inhnaih reng a ni. Tack humhalhna tur hmun him, mahse thermal gain erawh a tlem hle.
2. Loading lian tak atanga sang (30-60 vol%) – window pawimawh tak
Particle te hian an khawih tan a, conductive pathway an siam tan a. Thermal conductivity chu nasa takin a sang chho zel a. Chutih lai chuan continuous resin matrix chu a inthen darh ta a ni. Adhesive chu a brittle ta a; initial tack leh peel chakna chu nasa takin a tlahniam.
Hei hi optimization zone a ni. A tum ber chu lamah hnathawh a ni percolation threshold hnuai lam tawp – thermal specs zawm thei tur khawpa sang, pawmtlak adhesion neih theihna turin continuous resin phase vawng reng thei tur khawpa hniam.
3. Ultra-high loading (>60 vol%) a awm thei bawk.
Dense particle packing hian thermal gain (plateau) a ti hniam zual sauh sauh a ni. Resin hian hmun ruak zawng zawng a luah khat thei lo; voids siam a ni. Adhesive chu a vawt a, a chhe thei a, a tacky lo tluk a ni. Tape chu thermal film fragile tak a lo ni ta a ni. Property balance chu a bo vek a ni.
PTFE tape (silicone PSA) atana hriat tur bik: Silicone hian acrylic aiin cohesion energy a nei tlem zawk a, filler compatibility a tha lo zawk bawk. Maximum filler loading hniam zawk a tuar thei. Over-filling hian adhesive pulverization a thlen thin.
Aokai PTFE empirical data : Silicone PSA-a spherical alumina tan chuan percolation threshold hi a tlangpuiin 35-45 vol% a ni. Optimal balance hi bimodal distribution hmangin 40-45 vol% vel a ni. 55 vol% aia sang chuan adhesion hi hmanna tam zawkah chuan pawm theih loh a ni ta.
Thupui – Three-in-One Balancing Formula tih hi a ni
spherical coarse particles (20-30 μm) hmang rawh – through-plane conductivity an pe a, adhesion loss tlem ber an pe bawk. Primary conductive skeleton atan
fine particles (1-5 μm) dah la – voids a luah khat a, total filler mamawh a tihtlem a, resin matrix a humhim bawk. Bimodal distribution siam turin
Total filler loading chu percolation threshold lower-middle range-ah dah tur a ni (silicone PSA-a spherical alumina tan 40-45 vol% vel).
Flaky emaw fibrous fillers hi <5 wt% ah tihtlem rawh – tack a tichhe a, through-plane benefit tlemte chauh a pe bawk. a tul tak tak a nih chuan
Chumi rah chhuah chu: Thermally conductive PSA tape a ni a, a takin a stick a, a rei thei bawk.
Aokai PTFE hian he bimodal spherical filler strategy hmang hian thermally conductive PTFE tape a siam thin a ni. I application angin thermal conductivity leh adhesion level te chu kan siam rem thei a ni.
Final Takeaway neih a ni
PTFE adhesive tape-a thermal conductivity tihchangtlun hian adhesion a do fo thin. Compromise tha ber chu spherical particles + bimodal size distribution + loading just past percolation atanga lo chhuak a ni . I application hian in-plane conductivity bik a mamawh a, low tack a tuar thei a nih loh chuan flakes leh fibers te hi pumpelh rawh.
Heat dissipation nena high-performance bonding atan chuan thermally conductive PTFE tape hi solution finfiah a ni. biak theih a ni . Aokai PTFE I thermal leh peel mamawh ang zela formulation siam duh tan
