Ku ringanisela ku fambisa ku hisa na ku namarhela eka Tithepi ta ku Namarhela ta Mahiselo ya le Henhla ya PTFE

Loko thepi ya PTFE yi lava ku hangalasa kuhisa – xikombiso, ku boha xiphemu xa matimba eka heat sink – leyara yo namarhela yifanele ku endla swilo swimbirhi hi nkarhi wun’we: hundzisela kuhisa naku khoma swinene. Ku chela ti thermal conductive fillers (alumina, boron nitride, na swin’wana) swi antswisa thermal conductivity kambe kwalomu ka minkarhi hinkwayo swi hunguta ku namarhela.

Ntlhontlho i ku kurisa ku hundziseriwa ka ku hisa kasi u lahlekeriwa hi ku namarhela kutsongo hilaha swi nga kotekaka hakona . Nhlamulo yi le ka tipharamitha tinharhu ta filler: vukulu bya swiphemuphemu, xivumbeko xa swiphemuphemu, na tiphesente ta ku layicha.

Aokai PTFE yi tumbuluxile ku fambisa ku hisa Tithepi ta PTFE ta switirhisiwa swa elektroniki na swa tiindasitiri. Xihloko lexi xi hlamusela hilaha vukulu bya ti particle, morphology, na loading swi khumbaka trade-off, na ndlela yo vumba ku ringanisela lokunene.

Vukulu bya Swiphemuphemu – The Fine-Coarse Trade-Off

Vukulu bya ti particle byi lawula ndlela leyi ti fillers ti endlaka kahle ha yona network leyi fambisaka kuhisa xikan’we na leswaku adhesive yi tsakamisa kahle kufikela kwihi bonding surface.

1. Swiphemu leswinene (nano ku ya eka submicron) .

• Vuyelo bya mahiselo: Ndzhawu yale henhla yale henhla yi yisa eka tindzhawu totala ta ku khumbana ka ti particle-particle, kambe na ku lwisana lokukulu ka interfacial thermal (phonon scattering). Agglomeration yo tika yi ringanyeta ku antswisiwa ka conductivity.

• Vuyelo bya ku namarhela: Ti particles letintsongo ti tswonga nhlayo leyikulu ya resin na ti tackifiers, leswi nonokisa adhesive. Tack yo sungula yi hunguteka swinene. Ku khuluka ka mati swa hunguteka, leswi hungutaka ku tsakama eka ti substrates ta PTFE letinga na eneji yale hansi yale henhla → matimba yale hansi ya peel.

• Xiboho: A swi tali ku tirhisiwa swi ri swoxe. Ti fillers ta ultra-fine tinyika marginal thermal gain kambe ti herisa ku namarhela.

2. Swiphemu leswi nga ni swirhumbana (micron ku ya eka makume ya ti microns) .

• Vuyelo bya kuhisa: Tindhawu titsongo to khumbana kambe tindlela to leha to fambisa kuhisa ka munhu hi xiyexe. Loko ti hlanganisiwa swinene kuya hi tlhelo ra vukulu bya adhesive, tinyika through-plane conductivity ya kahle.

• Vuyelo bya ku namarhela: Ndzhawu yale hansi yale henhla yi adsorb resin yitsongo, leswi hlayisaka ku olova ka adhesive. Kambe loko ti particles ti enta kufana na kumbe ti tiya kutlula adhesive layer (hi ntolovelo 25-100 μm), ti roughen the tape surface, ti hunguta ndzhawu ya bonding leyi tirhaka, naswona ti endla ti stress concentration points.

• Verdict: Yitirhisiwa tani hi primary conductive skeleton, kambe yifanele kuva na sayizi yale hansi ka adhesive thickness.

3. Xitshunxo – ku hlanganisiwa ka bimodal

Hlanganisa swiphemuphemu swa coarse na fine eka ti ratios tokarhi. Ti grains letintsongo ti tata swivandla exikarhi ka ti coarse particles, leswi fikelelaka ku paka kusuhi swinene. Hiku layicha totala loku fanaka ka filler, bimodal grading yi engetela ti particle contact points (ku fambisa ko antswa) kumbe, hindlela yin’wana, yifika eka target conductivity na less total filler , leswi siyaka xiphemu xa resin lexi yaka emahlweni ku hlayisa ku namarhela.

Xitsundzuxo xa Aokai PTFE : Eka 50 μm yo enta ya adhesive layer, tirhisa ti coarse particles ta 20-30 μm leti pfanganisiweke na ti fine particles ta 1-5 μm. Endlelo leri ra bimodal i xilotlelo xo ringanisela swivumbeko.

Xivumbeko xa Swiphemuphemu – Xivumbeko I xa Nkoka Swinene

Ti fillers letingariki ta xirhendzevutani tiringanela hinkarhi wa ku peta naku omisiwa, leswi khumbhaka through-plane (Z-direction) thermal conductivity xikan’we naku namarhela.

1. Swilo swo tata swa xirhendzevutani kumbe swa xirhendzevutani (xikombiso, alumina ya xirhendzevutani) .

• Vuyelo bya ku hisa: Isotropic. Ti particles ti stack hiku olova kuya hi tlhelo ra vukulu, swikahle eka through-plane heat dissipation.

• Vuyelo bya ku namarhela: Swiphemu leswi rhetaka a swi siveli ku khuluka ka resin. Yi hlayisa cold-flow na surface wetting. Exikarhi ka swivumbeko hinkwaswo eka ku layicha loku ringanaka, swirhendzevutani swi hlayisa ku namarhela lokunene – ngopfu ngopfu tack yosungula.

• Vuyelo bya ku ringanisela: Ku fambisana lokunene hi ku angarhela. Ku kurisa Z-axis thermal gain na ku lahlekeriwa kutsongo ka adhesion.

2. Swilo swo tata leswi nga ni swiphepherhele (xikombiso, boron nitride, graphene) .

• Vuyelo bya mahiselo: Aspect ratio yale henhla yinyika conductivity ya kahle swinene yale ndzeni ka xihahampfhuka, kambe ti flakes tiringanela ti fambelana na substrate, tinyika ku antswisiwa kutsongo eka through-plane – swikahle eka ti PTFE tapes leti lavaka ku hundziseriwa ka kuhisa loku yimisiweke.

• Vuyelo bya ku namarhela: Ti flakes ti tirha kufana na ti partition films, ti sivela ku khuluka ka plastiki naswona ti tsema swinene tack yosungula. Makumu lawa ya tlhavaka ya endla leswaku kuva na ntshikelelo, leswi hungutaka matimba ya peel.

• Ku pfumaleka ka ku ringanisela: Ku ringanela kahle eka swilaveko swa mahiselo ya Z-direction, swi onha swinene ku namarhela ka ntumbuluko. A swi bumabumeriwi tani hi filler leyikulu.

3. Swilo swo tata leswi nga ni tifibre kumbe leswi nga tshamisekangiki

• Thermal effect: High aspect ratio yinga aka ti conductive networks eka loading yale hansi.

• Vuyelo bya ku namarhela: Ku engetela swinene viscosity ya adhesive, ku tiyisisa PSA hiku tirhisa mechanical interlocking, naku herisa tackiness. Matlhelo yo kariha ya onha xihlanganisi xa adhesive-PTFE.

• Xiboho: A xi tirhisiwi ngopfu tanihi xitirhisiwa lexikulu xo tata; ntsena ku engeteriwa lokuntsongo tanihi switirhisiwa swo pfuneta ku hlanganisa.

Ku layicha ka Filler – Ku kuma ndzhawu yo nandziha ya Percolation

Loko filler loading yikula, thermal conductivity yi tlakuka hiku nonoka ekusunguleni, kutani yi tlula swinene eka percolation threshold , kutani yi tlula plateaus. Hambiswiritano, ku namarhela ku ya ku hunguteka.

1. Ku layicha ka le hansi (<30 vol%) .

Ti fillers i swihlala leswi hambanisiweke eka matrix ya resin leyi yaka emahlweni. Ku fambisa ku hisa a ku antswi ngopfu. Ku namarhela switshama swiri ekusuhi na PSA yo basa. Ndzhawu leyi hlayisekeke yo hlayisa tack, kambe thermal gain ayi nyawuli.

2. Ku layicha ka le xikarhi kuya eka le henhla (30-60 vol%) – fasitere ra nkoka

Swiphemuphemu swi sungula ku khumba ni ku vumba tindlela leti fambisaka. Vufambisi bya ku hisa byi tlakuka hi xihatla. Hi nkarhi wolowo, matriki ya resin leyi yaka emahlweni yi va leyi hambanisiweke. Xinamarheti xi hundzuka xi va brittle; tack yosungula na matimba ya peel ya hunguteka swinene.

Leyi i ndhawu yo antswisa. Xikongomelo iku tirha eka makumu yale hansi ya percolation threshold – yale henhla swinene kuva yi fikelela thermal specs, yale hansi swinene kuva yi hlayisa xiphemu xa resin lexi yaka emahlweni kuva ku namarhela loku amukelekaka.

3. Ku layicha ka le henhla swinene (>60 vol%) .

Ku pakiwa ka swiphemuphemu leswi tsindziyeleke swi hunguta ku engeteleriwa ka ku hisa (plateau). Resin a yi nge swi koti ku tata swivandla hinkwaswo; ti voids ti vumbiwa. Xinamarheti xi hundzuka xi oma, xi tshoveka naswona xi lava ku va xi nga namarheli. Thepi yi hundzuka filimi yo hisa leyi nga tiyangiki. Nhundzu leyi saleke yi lahleka hi ku helela.

Xitsundzuxo xo hlawuleka xa PTFE tape (silicone PSA): Silicone yina eneji yale hansi ya cohesion xikan’we naku fambisana ka filler lokunga kahle kutlula acrylic. Yi tiyisela ku layicha ka le hansi ka maximum filler. Ku tata ngopfu swivanga ku tshoveka ka adhesive.

Aokai PTFE empirical data : Eka alumina ya xirhendzevutani eka silicone PSA, threshold ya percolation yi kwalomu ka 35-45 vol%. Ku ringanisela lokunene ku fikeleriwa kwalomu ka 40-45 vol% hi ku hangalasiwa ka bimodal. Ehenhla ka 55 vol%, ku namarhela swiva swinga amukeleki eka switirhisiwa swotala.

Nkatsakanyo – Fomula yo Ringanisa ya Swinharhu eka Yin’we

Ku fikelela ku ringanisela loku tiyeke ka ku fambisa ku hisa–ku namarhela eka tithepi ta ku namarhela ta mahiselo ya le henhla ya PTFE:

1. Tirhisa swiphemuphemu swa spherical coarse (20-30 μm) tani hi primary conductive skeleton – swinyika through-plane conductivity na ku lahlekeriwa kutsongo ka adhesion.

2. Engeta ti fine particles (1-5 μm) kuva ku endla bimodal distribution – yi tata ti voids, yi hunguta total filler leyi lavekaka, yi hlayisa resin matrix.

3. Hlayisa total filler loading eka ndzhawu yale hansi-xikarhi ya percolation threshold (kwalomu ka 40-45 vol% eka spherical alumina eka silicone PSA).

4. Pfuxeta ti flaky kumbe fibrous fillers kuya eka <5 wt% loko swilaveka hiku hetiseka – ti onha tack naswona tinyika mbuyelo wuntsongo wa through-plane.

Vuyelo bya kona: Thepi ya PSA leyi fambisaka ku hisa leyi entiyisweni yi namarhelaka naswona yi tshamaka.

Aokai PTFE yi endla tithepi ta PTFE leti fambisaka ku hisa hi ku tirhisa maqhinga lawa ya bimodal spherical filler. Hi nga lulamisa ku fambisa ku hisa na swiyimo swa ku namarhela eka xikombelo xa wena.

Takeaway yo hetelela

Ku antswisa thermal conductivity eka ti PTFE adhesive tapes minkarhi hinkwayo swi lwisana na ku namarhela. Ku pfumelelana lokunene ku huma eka swiphemuphemu swa xirhendzevutani + ku hangalasiwa ka sayizi ya bimodal + ku layicha loku hundzeke ntsena eka percolation . Papalata ti flakes nati fibres handle ka loko xitirhisiwa xa wena xilava hiku kongoma in-plane conductivity naswona xinga tiyisela low tack.

Eka ku hlanganisiwa ka matirhelo yale henhla na ku hangalasiwa ka kuhisa, thepi ya PTFE leyi fambisaka mahiselo i xitshunxo lexi tiyisisiweke. Tihlanganisi na Aokai PTFE ku kuma ti formulations leti fambelanaka na swilaveko swa wena swa thermal na peel.

Vuxokoxoko bya xithekiniki lebyi nyikiweke hi Jiangsu Aokai Switirhisiwa Leswintshwa Thekinoloji Co., Ltd.

Ku kuma swihlawulekisi swa vuxokoxoko na swintshuxo swa ntolovelo swa malapi ya mahiselo ya le henhla ya PTFE, tithepi, mabandhi ya mesh, na swin’wana:

• Nkulukumba Guo: +86 18944819998

• Nkulukumba Liu: +86 13705266308

Hi ku namarhela vutshila na vutshembeki, hi nyika swintshuxo leswi endleriweke ku yima kan’we na vukorhokeri bya le ndzhaku ka ku xavisiwa lebyi anakanyisisiweke.