Teflon masana'antun zane mai zafin jiki sun nuna cewa ka'idojin ƙimar sanyaya shine hanya mafi kai tsaye da inganci don sarrafa crystallinity. Bayan PTFE gaba ɗaya narke sama da 380 ° C, sarƙoƙi na ƙwayoyin cuta suna shirya cikin lattices crystal lokacin wucewa ta matsakaicin matsakaicin ƙimar zafin jiki na 310 ~ 315 ° C yayin sanyaya. Adadin sanyaya yana ƙayyade girman yanki na crystal da ƙananan ƙwayoyin cuta na sutura.
1. Saurin sanyaya (quenching) don ƙananan crystallinity
Wurin da aka ƙera yana da saurin sanyaya ta ta labulen iska mai sanyi, masu sanyaya abin nadi ko tankunan ruwa masu zafi na al'ada. Ana daskarar da sarƙoƙin ƙwayoyin cuta kafin tsari na yau da kullun da tsari na yau da kullun, suna samar da adadi mai yawa na ƙananan ƙwayoyin kristal mara kyau. Rufin da aka samu yana nuna nau'in laushi mai laushi da kyakkyawan tauri tare da ingantaccen aikin da ba ya aiki, yayin da taurin sa da juriya ya ragu kaɗan.
2. Slow sanyaya (annealing) ga high crystallinity
Ana shirya sashin adana zafi a mashigar tanderun da ke daɗaɗa zafi, ko kuma a sanyaya zanen tare da tanderun a cikin matsanancin jinkirin 10 ~ 50 ° C/h. Wannan yana ba da damar isassun motsi na sarƙoƙi na ƙwayoyin cuta don samar da manya da cikakkun spherulites. Rubutun yana alfahari da tsayin daka, juriya mai ban sha'awa da kwanciyar hankali mai tsayi, duk da haka tare da raguwar sassauci da haɓakar brittleness.
II. Tsarin Taimako da Sarrafa kayan aiki
A kan tushen sanyaya kudi tsari, wadannan karin matakan iya kara lafiya-tune da crystallinity na PTFE shafi.
1. Sintering zafin jiki da kuma riƙe lokaci
Dole ne a yi zafi da kayan zuwa 380 ~ 400 ° C kuma a riƙe shi don isasshen lokaci don narke gaba ɗaya lu'ulu'u na asali da kuma kawar da tarihin thermal. Rashin isassun sintepon zai bar sauran kristal nuclei, yana haifar da tsayin daka da yawa kuma ba daidai ba a rarraba na ƙarshe.
2. Annealing bayan magani
Don sutura da ƙananan crystallinity da aka samu ta hanyar sanyaya mai sauri, haɓakar kristal na biyu da kawar da damuwa na ciki za a iya gane su ta hanyar kula da zafin jiki akai-akai a 300 ~ 320 ° C na tsawon sa'o'i da yawa tare da jinkirin kwantar da hankali, wanda ke ƙara haɓaka crystallinity na shafi.
3. Raw abu kwayoyin nauyi
High-kwayoyin-nauyi PTFE watsawa siffofi high narke danko da low kwayoyin sarkar motsi, abu zuwa hankali crystallization kudi. A ƙarƙashin yanayin sanyi guda ɗaya, yana da sauƙi don shirya sutura tare da ƙananan crystallinity.
4. Ƙarin wakili na nukiliya
Karamin sashi (0.1% ~ 1%) na kayan maye na inorganic ko masu gurbataccen ruwa na iya samar da adadi mai yawa na kristal iri-iri da kuma tace hatsin lu'ulu'u sosai. Ko da yake ba zai iya canza girman crystallinity gaba ɗaya ba, yana inganta ingantaccen microstructure na crystal yadda ya kamata.
III. Cikakken Gudanarwa don Ƙirƙirar Rufe Mai Layi da yawa
Teflon high-zazzabi zane da aka samar da mahara impregnation da sintering matakai tare da hankali tara coatings, bukatar niyya tsari iko kamar haka.
1. Interlayer crystallization daidaito
Babban bambance-bambance a cikin adadin sanyaya tsakanin yadudduka zai haifar da rashin daidaituwa tsakanin crystallinity da haifar da damuwa na ciki, har ma yana haifar da kwasfa mai laushi a lokuta masu tsanani. Ana ba da shawarar yin amfani da sanyi mai laushi don tsaka-tsakin yadudduka, da aiwatar da niyya mai sauri ko jinkirin sanyaya kawai don mafi girman Layer bisa ga buƙatun samarwa.
2. Rufi kauri sakamako
Maɗaukaki masu kauri suna fama da sanyi mai sanyi a tsakanin saman da Layer na ciki. Layer na ciki yana ƙoƙarin samar da babban crystallinity saboda jinkirin watsawar zafi. Wajibi ne a tsawaita lokacin da ya dace don tabbatar da yawan zafin jiki na gabaɗayan rufin kafin aiwatar da hanyoyin sanyaya haɗin gwiwa.
3. Daidaitawar tashin hankali yayin sanyaya
Tashin hankali da aka yi amfani da shi a saman zane a lokacin sashin sanyaya yana rinjayar daidaitawar sassan kwayoyin halitta, wanda ma'aurata tare da tsarin crystallization da haɗin gwiwa ke ƙayyade yanayin halittar crystal na ƙarshe da kwanciyar hankali. Haɗin kai da daidaitaccen iko ya zama dole.
IV. Ƙididdigar Ganewar Crystallinity
Dole ne a ɗauki Bambancin Scanning Calorimetry (DSC) don tabbatar da crystallinity bayan daidaitawar tsari. A 5 ~ 10mg shafi samfurin ne mai tsanani a wani kudi na 10 ° C / min don gwada narkewa enthalpy. Ana ƙididdige kristal ɗin ta hanyar rarraba enthalpy ɗin da aka gwada ta hanyar narkewar ƙa'idar narkewa ta 100% crystalline PTFE (kimanin 82J/g). Haɗe tare da juriya na lanƙwasawa, juriya na sawa da sauran gwaje-gwajen aiki, za'a iya ƙaddara taga mafi kyawun tsari.
Ka'idodin Ayyuka na Gabaɗaya : Don samun ƙarancin crystallinity, aiwatar da quenching nan da nan bayan cikakken sintering; Don samun babban crystallinity, kiyaye zafin jiki akai-akai kusa da 310 ° C tare da jinkirin sanyi sosai bayan cikawar juzu'i.
Don cikakkun bayanai game da cikakkun sigogi, yanayin aikace-aikacen da keɓance hanyoyin samfuran samfuranmu waɗanda suka haɗa da zanen Teflon mai zafi mai zafi, Teflon mai zafin jiki mai zafi, Teflon high-zazzabi raga bel, bel ɗin haɗin gwiwa mara ƙarfi, PTFE mai gefe ɗaya mai gefe, babban zafin jiki mai juriya ga bel mai ɗaukar hoto da bel ɗin fiber mai zafi mai ƙarfi don ba da ƙwanƙwasa bel da bel. mu kan layi ko tuntuɓi layin sabis ɗin mu.
