Mgbe teepu PTFE kwesịrị ịgbasa okpomọkụ - dịka ọmụmaatụ, ijikọta ihe ike na-ekpo ọkụ na-ekpo ọkụ - akwa mkpuchi ahụ ga-eme ihe abụọ n'otu oge: nyefee okpomọkụ ma jidesie ike. Ịtinye ihe ndị na-emepụta ihe na-ekpo ọkụ (alumina, boron nitride, wdg) na-eme ka ọkụ eletrik dịkwuo mma ma ọ fọrọ nke nta ka ọ bụrụ mgbe niile na-ebelata ntachi obi.
Ihe ịma aka a na-eme bụ ịbawanye mbufe ọkụ ka ọ na-efunahụ ntachi obi dị ka o kwere mee . Azịza ya dabere na parampat ihe ndochi atọ: nha urughuru, udi ihe, na pasentị ibu.
Aokai PTFE emepụtala ihe na-eme ka ọkụ Mpempe akwụkwọ PTFE maka ngwa eletrọnịkị na ngwa ụlọ ọrụ. Isiokwu a na-akọwa otú urughuru nha, morphology, na loading emetụta ahia-apụ, na otú e si chepụta maka kacha mma itule.
Nha urughuru – Azụmaahịa dị mma nke dị oke njọ
Oke urughuru na-achịkwa ka ndị na-ejuputa ihe na-etolite nke ọma na netwọk na-eduzi okpomọkụ yana ka nrapado na-eweda elu njikọ.
1. Ihe dị mma (nano ruo submicron)
Mmetụta thermal: Ebe dị elu na-eduga n'inyocha ihe kọntaktị-urughi uru, mana ọ na-enwekwa ike iguzogide ikuku interfacial (phonon agbasasị). Agglomeration siri ike na-egbochi nkwalite conductivity.
Mmetụta adhesion: Ihe ndị dị mma na-etinye nnukwu resin na tackifiers, na-eme ka nrapado sie ike. Mgbochi mbụ na-ada nke ọma. Ntughari na-ebelata, na-ebelata wetting na obere ala-ike PTFE substrates → obere peel ike.
Mkpebi: A naghị eji naanị ya eme ihe. Ihe nchacha dị mma na-enye uru ọkụ dị n'akụkụ mana na-emebi adhesion.
2. Ụmụ irighiri irighiri ihe (micron ruo iri iri nke microns)
Mmetụta okpomọkụ: Ebe kọntaktị dị ole na ole mana ogologo ụzọ nduzi okpomọkụ nke onye ọ bụla. Mgbe chiri anya stacked tinyere nrapado ọkpụrụkpụ direction, ha na-enye ezi site-ụgbọelu conductivity.
Mmetụta adhesion: Mpaghara ala dị ala na-eme ka resin dị ntakịrị, na-echekwa nro nro. Otú ọ dị, ọ bụrụ na ụmụ irighiri ihe dị oke ma ọ bụ karịa karịa oyi akwa nrapado (nke na-abụkarị 25-100 μm), ha na-eme ka elu teepu ahụ dị nro, na-ebelata ebe njikọ dị irè, na-emepụta ihe mgbakasị ahụ.
Mkpebi: A na-eji ya dị ka ọkpụkpụ na-eduzi isi, mana ọ ga-enwerịrị nha n'okpuru ọkpụrụkpụ nrapado.
3. Ihe ngwọta - ngwakọta bimodal
Gwakọta ụmụ irighiri ihe na nke ọma na oke ụfọdụ. Mkpụrụ ọka dị mma na-ejupụta oghere dị n'etiti irighiri irighiri ahụ, na-enweta mbukota kacha nso. Na otu mkpokọta ndochi loading, bimodal grading na-abawanye uru kọntaktị kọntaktị (mma conductivity ka mma) ma ọ bụ, ọzọ, rute conductivity ezubere iche na obere ngụkọta ndochi , na-ahapụ ọzọ resin resin usoro iji chekwaa adhesion.
Nkwanye Aokai PTFE : Maka akwa akwa akwa akwa 50 μm, jiri obere irighiri ihe nke 20-30 μm gwakọtara na ezigbo irighiri nke 1-5 μm. Usoro bimodal a bụ isi ihe na-eme ka akụrụngwa guzozie.
Mkpụrụ ndụ ihe nketa - Ọdịdị dị mkpa nke ukwuu
Ndị na-emepụta ihe na-abụghị sppherical na-edozi n'oge mkpuchi na ihicha, na-emetụta site na ụgbọ elu (Z-direction) thermal conductivity na adhesion.
1. Spherical ma ọ bụ nke dị okirikiri (dịka ọmụmaatụ, alumina okirikiri)
Mmetụta okpomọkụ: isotropic. Ahụhụ tojupụtara mfe n'akụkụ ọkpụrụkpụ direction, dị mma maka site-ụgbọelu okpomọkụ dissipation.
Mmetụta adhesion: Ebe dị larịị anaghị egbochi eruba resin. Na-echekwa mmiri na-asọ oyi na mmiri n'elu. N'ime ụdị niile na ntinye nha nha, oghere na-ejigide nrapado kacha mma - ọkachasị ihe mbido mbụ.
Uru nha nha: ndakọrịta kacha mma n'ozuzu ya. Na-ebuli uru ọkụ-axis Z-axis na mfu ntachi obi dị ntakịrị.
Thermal mmetụta: High akụkụ ruru na-enye magburu onwe na-ụgbọelu conductivity, ma flakes kwekọọ yiri nke mkpụrụ, na-enye obere site-ụgbọ elu mma - ogbenye maka PTFE teepu na mkpa vetikal okpomọkụ nyefe.
Mmetụta adhesion: Flakes na-eme dị ka ihe nkiri nkebi, na-egbochi eruba plastik ma na-egbutu ihe mbụ. Akụkụ dị nkọ na-eme ka ịta ahụhụ, na-ebelata ike bee.
Ọdịmma nha nha: adịghị mma maka mkpa okpomọkụ nke ntụzịaka Z, na-emebi nke ukwuu nrapagidesi ike. A naghị atụ aro ka ọ bụrụ isi ihe ndochi.
3. Fibrous ma ọ bụ mgbe ụfọdụ fillers
Mmetụta okpomọkụ: akụkụ dị elu nwere ike wulite netwọk ndị na-eduzi na ntinye dị ala.
Mmetụta nrapado: na-abawanye viscosity nrapado nke ukwuu, na-eme ka PSA siri ike site na nchikota igwe, ma mebie nhịahụ. Akụkụ dị nkọ na-emebi ihe nrapado-PTFE.
Mkpebi: Ọ na-adịkarịghị eji dị ka isi ihe ndochi; naanị obere mgbakwunye dị ka ihe nchikota inyeaka.
Nbudata Filler - Ịchọta ntụpọ ụtọ Percolation
Ka ntinye ndochi na-abawanye, conductivity thermal na-ebili nwayọọ nwayọọ na mbụ, wee na-awụlikwa elu nke ọma na ọnụ ụzọ percolation , emesia ahụ dị larịị. Otú ọ dị, adhesion na-agbada mgbe niile.
1. Nbudata dị ala (<30 vol)
Fillers bụ agwaetiti dịpụrụ adịpụ na matriks resin na-aga n'ihu. Nrụpụta okpomọkụ na-akawanye mma. Adhesion na-anọgide na nso PSA dị ọcha. Mpaghara dị mma maka ichekwa ihe mgbakasị ahụ, mana uru ọkụ anaghị eleghara anya.
2. Ọkara-na-elu loading (30-60 vol) - windo dị oke egwu
Ụmụ irighiri ihe na-amalite imetụ aka ma mepụta ụzọ ndị na-eduzi. Thermal conductivity na-ebili nke ukwuu. Ka ọ dị ugbu a, matriks resin na-aga n'ihu na-ekewa. Nrapado na-atụgharị kewaa; ike mbụ na bee na-ada nke ọma.
Nke a bụ mpaghara kacha mma. Ebumnuche bụ ịrụ ọrụ na njedebe ala nke ọnụ ụzọ percolation - dị elu zuru oke iji zute nkọwapụta okpomọkụ, dị ala iji jigide usoro resin na-aga n'ihu maka nrapanye a na-anabata.
3. Oke dị elu (> 60 vol)
Mkpokọta urughuru oke na-ebelata uru okpomọkụ ọzọ (Plateau). Resin enweghị ike imeju oghere niile; voids na-etolite. Ihe nrapado na-aghọ nkụ, na-akụkụ, na ọ fọrọ nke nta ka ọ ghara ịta ahụhụ. Teepu ahụ na-aghọ ihe nkiri ọkụ na-esighi ike. Akwụsịla itule ihe onwunwe kpamkpam.
Ihe ndetu pụrụ iche maka teepu PTFE (silicone PSA): Silicone nwere ike nchikota dị ala yana ndakọrịta na-adaba adaba karịa acrylic. Ọ na-anabata nbudata ihe ndochi dị ala. Njuju nke ukwuu na-ebute nrapado nrapado.
Aokai PTFE empirical data : Maka alumina okirikiri na silicone PSA, ọnụ ụzọ percolation bụ ihe dịka 35-45 volts. A na-enweta nguzozi kachasị mma gburugburu 40-45 vol% na nkesa bimodal. N'elu 55 volts, adhesion na-aghọ nke anabataghị maka ọtụtụ ngwa.
Nchịkọta - Usoro nhazi nke atọ n'ime otu
Iji nweta njikwa okpomọkụ kwụsiri ike – nguzozi adhesion na teepu nrapado dị elu nke PTFE:
Jiri obere ihe dị okirikiri (20-30 μm) dị ka ọkpụkpụ na-eduzi isi - ha na-enye conductivity nke ụgbọ elu na obere mfu adhesion.
Tinye ihe dị mma (1-5 μm) iji mepụta nkesa bimodal - na-ejupụta oghere, na-ebelata mkpokọta ihe achọrọ, na-echekwa resin matrix.
Debe mkpokọta ihe ndochi n'obere ala etiti nke ọnụ ụzọ percolation (ihe dịka 40-45 volts maka alumina okirikiri na silicone PSA).
Machie ihe ndị na-agba agba ma ọ bụ fibrous ka ọ bụrụ <5 wt% ma ọ bụrụ na achọrọ ya ma ọlị - ha na-emerụ ahụ ma na-enye obere uru ụgbọ elu.
Ihe si na ya pụta: teepu PSA na-ekpo ọkụ nke na-arapara n'ahụ ma dịgide.
Aokai PTFE na-arụpụta teepu PTFE na-ekpo ọkụ na-eji usoro ihe mkpuchi bimodal a. Anyị nwere ike hazie ikpo ọkụ yana ọkwa adhesion na ngwa gị.
Ụzọ ikpeazụ
Ịkwalite conductivity thermal na teepu ntanye PTFE na-alụ ọgụ mgbe niile megide adhesion. Nkwekọrịta kachasị mma na-abịa site na irighiri ihe dị okirikiri + nkesa nha bimodal + na-ebufe percolation gara aga . Zere flakes na eriri ma ọ bụrụ na ngwa gị chọrọ kpọmkwem conductivity n'ime ụgbọ elu ma nwee ike ịnabata obere ihe.
N'ihi na elu-arụmọrụ bonding na okpomọkụ dissipation, thermally conductive PTFE teepu bụ ihe ngwọta pụtara ìhè. Kpọtụrụ Aokai PTFE maka usoro dakọtara na ihe ọkụ na bee gị chọrọ.
