I. Nawumbisi lowu kongomeke wa Mpimo wa ku Pfuxeta
Vaendli va malapi ya teflon ya mahiselo yale henhla va kombisa leswaku ku lawuriwa ka cooling rate i ndlela yo kongoma swinene naswona leyi tirhaka swinene ku lawula crystallinity. Endzhaku kaloko PTFE yi n’okisiwile hiku hetiseka ehenhla ka 380°C, ti molecular chains ti hlela kuva ti crystal lattices loko ti hundza eka maximum crystallization rate temperature range ya 310~315°C hinkarhi wa ku kufumela. Nhlayo ya ku kufumela yi veka mpimo wa ndzhawu ya crystal xikan’we na microscopic morphology ya coating.
1. Ku kufumela hiku hatlisa (ku tima) kuva kuva na crystallinity yale hansi
Vuandlalo bya lapi leri sintered ri titimela hiku hatlisa hiku tirhisa ti curtains ta moya wo titimela, ti cooling rollers kumbe mathangi ya mati ya normal-temperature. Tikhetane ta timolekhuli ti titimela ti nga si lunghiseleriwa nkarhi na nkarhi ni hi ku hleleka, ti vumba nhlayo leyikulu ya tindzoho letitsongo ni leti nga hetisekangiki ta kristala. Xifunengeto lexi kumiweke xina xivumbeko xo olova xikan’we naku tiya swinene na matirhelo lawa ya antswisiweke ya non-stick, kasi ku tiya ka yona xikan’we naku tiya ka ku onhaka swihungutiwile nyana.
2. Ku kufumela hiku nonoka (annealing) kuva kuva na crystallinity yale henhla
Xiphemu xo hlayisa kuhisa xi lulamisiwile eka ndzhawu yo huma ya sintering furnace, kutani lapi ri titimela hi furnace hi rivilo ro nonoka swinene ra 10~50°C/h. Leswi swipfumelela ku famba loku ringaneleke ka ti molecular chains kuva ti endla ti spherulites letikulu na leti heleleke. Xifunengeto xitinyungubyisa hi ku tiya lokukulu, ku tiya loku hlamarisaka ka ku onhaka xikan’we naku tiya ka dimensional loku tiyeke, kambe na kuhunguteka ka ku olova xikan’we naku engeteleriwa ka brittleness.
II. Endlelo ro pfuneta na Vulawuri bya Switirhisiwa
Hiku ya hi vulawuri bya cooling rate, magoza lawa ya pfunetaka lawa ya landzelaka yanga ya emahlweni ya lulamisa kahle crystallinity ya PTFE coating.
1. Mahiselo ya sintering na nkarhi wo khoma
Nchumu lowu wufanele ku hisiwa kuya eka 380~400°C naswona wu khomiwa nkarhi lowu ringaneleke kuva wu n’oka hiku hetiseka ti crystals tosungula xikan’we naku herisa matimu ya mahiselo. Ku sintering lokunga ringanelangiki swita siya ti residual crystal nuclei, leswinga endla leswaku kuva na crystallinity yohetelela yale henhla swinene naswona yinga hangalasiwa hiku ringana.
2. Ku hlantswa endzhaku ka vutshunguri
Eka swifunengeto leswingana crystallinity yale hansi leswi kumiwaka hiku kufumela hiku hatlisa, kukula ka crystal ya vumbirhi xikan’we naku herisiwa ka ntshikelelo wale ndzeni swinga endliwa hiku tshungula hi mahiselo ya nkarhi hinkwawo eka 300~320°C kuringana tiawara to hlaya leswi landzeriwaka hiku kufumela hiku nonoka, leswi engetelaka hindlela yo ringanela crystallinity ya coating.
3. Ndzilo wa molekhuli ya swilo leswi nga tirhisiwangiki
Ku hangalaka ka PTFE ka molecular-weight yale henhla swina melt viscosity yale henhla xikan’we naku famba famba ka molecular chain yale hansi, leswi yisaka eka crystallization rate yo nonoka. Ehansi ka swiyimo leswi fanaka swo kufumela, swa olova ku lulamisa swifunengeto leswingana crystallinity yale hansi.
4. Ku engeteriwa ka xiaki xa nyutliya
Nhlayo leyintsongo (0.1%~1%) ya ti inorganic fillers kumbe ti perfluorinated copolymers yinga nyika nhlayo leyikulu ya ti heterogeneous crystal nuclei naswona yi antswisa swinene ti crystal grains. Hambi leswi yinga kotiki ku cinca swinene crystallinity hinkwayo, kahle kahle yi antswisa microstructure ya crystal.
III. Vulawuri lebyi heleleke bya Vuhumelerisi bya Multi-Layer Coating
Teflon high-temperature cloth yi humelerisiwa hi maendlelo yotala ya impregnation na sintering na ti coatings leti hlengeletiweke hakatsongotsongo, leswi lavaka vulawuri bya maendlelo lebyi kongomisiweke hindlela leyi landzelaka.
1. Ku ringanana ka crystallization ya interlayer
Kuhambana lokukulu swinene eka cooling rate exikarhi ka ti layers swita vanga inconsistent interlayer crystallinity naswona swita endla leswaku kuva na ntshikelelo wale ndzeni, hambi kuri ku endla leswaku kuva na coating peeling eka swiyimo swo tika. Switsundzuxiwa ku amukela ku kufumela ko olova eka ti layers tale xikarhi, naku tirhisa ku kufumela loku kongomisiweke hiku hatlisa kumbe hiku nonoka ntsena eka leyara yale handle swinene kuya hi swilaveko swa vuhumelerisi.
2. Vuyelo bya ku tiya ka ku peta
Ti coatings to tiya ti xaniseka hiku kufumela ka asynchronous exikarhi ka le henhla na leyara yale ndzeni. Leyara yale ndzeni yitala ku endla crystallinity yale henhla hikokwalaho ka ku hangalaka ka kuhisa hiku nonoka. Swifanele ku engeteriwa hindlela leyi faneleke nkarhi wa sintering kutiyisisa mahiselo lawa ya fanaka ya coating hinkwayo loko kungase tirhisiwa maendlelo ya unified cooling.
3. Ku fambisana ka tension hi nkarhi wa ku kufumela
Ntshikelelo lowu tirhisiwaka eka vuandlalo bya lapi hinkarhi wa xiphemu xo kufumela wu khumba ku kongoma ka ti molecular chains, leswi hlanganisaka na maendlelo ya crystallization naswona hiku hlanganela swi veka xivumbeko xohetelela xa crystal xikan’we naku tiya ka dimensional. Vulawuri lebyi hlanganeke na lebyi kongomeke bya boha.
IV. Ku Kumiwa ka Nhlayo ya Crystallinity
Differential Scanning Calorimetry (DSC) yifanele ku amukeriwa ku tiyisisa crystallinity endzhaku ka ku lulamisiwa ka maendlelo. Xikombiso xa 5~10mg xa coating xi hisiwa hi mpimo wa 10°C/min ku kambela melting enthalpy. Crystallinity yi hlayeriwa hiku avanyisa melting enthalpy leyi kamberiweke hi theoretical melting enthalpy ya 100% crystalline PTFE (kwalomu ka 82J/g). Loko swihlanganisiwa na ku tiya ka ku gombonyoka, ku tiya ka ku ambala na swikambelo swin’wana swa matirhelo, fasitere ra maendlelo lerinene ringa kumiwa.
General Operation Principles : Ku kuma crystallinity yale hansi, tirhisa ku tima hiku hatlisa endzhaku ka sintering hiku hetiseka; kuva u kuma crystallinity yale henhla, hlayisa mahiselo lawa yanga cinciki ekusuhi na 310°C leswi landzeriwaka hiku kufumela hiku nonoka swinene endzhaku ka sintering hiku hetiseka.
Ku kuma vuxokoxoko byo enta eka tipharamitha leti nga na vuxokoxoko, swiyimo swa xikombelo na swintshuxo leswi endleriweke ku tirhisiwa ka switirhisiwa swa hina hinkwaswo ku katsa na lapi ra Teflon ra mahiselo ya le henhla, thepi yo namarhela ya Teflon ya mahiselo ya le henhla, bandi ra mesh ra mahiselo ya le henhla ya Teflon, bandi ra muchini ro boha leri nga na swirhabyani, lapi ra PTFE ra tlhelo rin’we, bandi ra conveyor leri lwisanaka na mahiselo ya le henhla na ku tiya ka mahiselo ya le henhla lapi ra fiberglass, hi kombela u ntshunxeka ku hi vulavurisana na hina eka inthanete kumbe u tihlanganisa na riqingho ra hina ra vukorhokeri.
Hi ku namarhela filosofi ya vukorhokeri bya xiphurofexinali na vutshembeki, hi tiyimiserile ku nyika swintshuxo swa xiyimo xin’we na vukorhokeri byo tekela enhlokweni eka vaxavi hinkwavo!
