Daga hangen nesa na uku dalilai da kayyade kaddarorin PTFE kayayyakin - kwayoyin nauyi, crystallinity da voidage, da voidage ne yafi shafa da preforming matsa lamba, da kwayoyin nauyi da crystallinity duk canza tare da daban-daban sintering yanayi.Don haka,sintering tsariyanayi suna taka muhimmiyar rawa a cikin ƙayyadaddun kaddarorin samfura kamar yawa, taurin kai, rashin ƙarfi da kaddarorin inji.
Daga hangen nesa na uku dalilai da kayyade kaddarorin PTFE kayayyakin - kwayoyin nauyi, crystallinity da voidage, da voidage ne yafi shafa da preforming matsa lamba, da kwayoyin nauyi da crystallinity duk canza tare da daban-daban sintering yanayi.Sabili da haka, yanayin tsari na sintering yana taka muhimmiyar rawa a cikin ƙayyadaddun kaddarorin samfuran kamar yawa, taurin kai, haɓakawa da kaddarorin inji.
Wang ping ya gano cewaHanyoyin ciniki na PTFEya shafi tashin hankali da faɗuwar gudu, zafin jiki da lokacin ɓacin rai.Mafi girma samfurin, da saurin saurin tashi da sanyaya, mafi tsayin lokacin ɓacin rai.Matsakaicin zafin gudu na resin dakatarwa ya fi na resin watsawa.Matsakaicin zafin jiki na samfuran kayan abu mai tsabta ya fi na samfuran da aka cika.Gabaɗaya, ƙimar dumama yana da sauri fiye da adadin sanyaya.A cikin tanderun da aka yi amfani da su guda ɗaya, kayan tsabta da kayan cikawa ba za a iya haɗuwa ba;Samfuran da ke da yanayi daban-daban ba za a iya haɗa su ba.Ba za a iya haɗa samfuran albarkatun ƙasa daban-daban ba.Shan samar da 3-Layer gyare-gyare madauwari farantin da diamita na 1 m, kauri na 20 mm, biyu Layer a matsayin tsarki ptfe da tsakiyar Layer kamar yadda cike ptfe a matsayin misali, da matsawa ƙarfi, lankwasawa ƙarfi, taurin da sauran inji Properties na An inganta farantin madauwari da aka samar da wannan fasaha sosai.
Liu xianlan ya yi nazari game da halaye na tsari, hanyar samar da tsari da halayen ƙira na PTFE, ya bincika lahani da musabbabin samfuran PTFE da aka samar ta hanyar latsa sanyi da sintiri, kuma ya gabatar da hanyoyin jiyya.PTFE za a iya gyare-gyare da dama preforming matakai, irin su gyare-gyare, extrusion, na'ura mai aiki da karfin ruwa gyare-gyaren, tura gyare-gyaren da sakandare aiki, sa'an nan sintered zuwa karshe samfurin.PTFE gyare-gyare ne mafi yawa Ya sanya daga dakatar guduro.Lokacin da kauri na takardar ya kasance ƙasa da 1.5mm, ana amfani da resin tarwatsa.Hanyar fasaha ta: guduro - sieve (gurjin dakatarwa bayan bugawa, sako-sako, da kuma 20 raga raga sieve) - latsa (PTFE foda yana ɗora da mold a ƙarƙashin matsa lamba daga 20 zuwa 35 MPa, bayan latsa compaction forming) - sintering (a cikin 370 ~ 380). "C zafin jiki sintering a sintering tanderu) - gyare-gyaren kayayyakin (a karkashin free jihar a cikin mold ko bayan sanyaya don kammala zane kamar yadda ake bukata da jirgin, sanduna, tubes, gaskets da shiryawa kayayyakin, da dai sauransu) .. Hydraulic hanya kuma ake kira da Hanyar ma'auni ko gyare-gyaren roba a cikin tsarin aikinta shine: sanya jakar roba a cikin mutu - an haɗa shi da famfo na ruwa, cika ruwa yana busa jakar robar a cikin wani nau'i na cylindrical - guduro ko'ina tsakanin jaka da waje mold mold rufe - ci gaba da karuwa a hankali. Ruwan ruwa, cika ruwa har zuwa 12 ~ 13 mpa matsa lamba yana riƙe da 30 min: bayan ruwa - raguwa, tsagewa, sintering, sanyaya shine amfani da bayyanar haske da tsabta.Har ila yau ana kiran turawa da manna extrusion gyare-gyare, 20 ~ 30 raga sieve watsawa guduro da Organic ruwa (kamar toluene, man fetur ether, da sauran ƙarfi mai) cakuda 1: 5 manna cakuda, preloading cikin lokacin farin ciki bango Silinda billet, tura a cikin kwampreso Silinda , dumama, tare da plunger tura gyare-gyare, bayan bushewa a cikin 360 ~ 380 ° C zafin jiki sintering, bayan sanyaya kayayyakin da karfi tura tube, sanda, da dai sauransu Extrusion gyare-gyare za a iya raba iri biyu: dunƙule extrusion da plunger extrusion.An ƙara resin da aka riga aka yi da shi bayan murkushewa da sifa a cikin silinda.Ta hanyar jujjuyawar dunƙule ko turawa mai jujjuyawa na plunger, ana jigilar albarkatun ƙasa zuwa mai extruder a lokaci guda na ƙaddamarwa.
Wang ping yayi nazarin tsarin samar da kayan kumfa na PTFE.Ana amfani da polytetrafluoroethylene da aka dakatar a matsayin albarkatun ƙasa, kuma an zaɓi nau'ikan hydrocarbons na cyclic aromatic a matsayin wakili mai haifar da pore.Bayan haɗawa, samfuran preforming suna preformed da sintered.A matakin farko na sintering, ana aiwatar da tsarin bushewa don yin tserewa wakili mai haifar da pore, sannan an shigar da matakin resintering.Ana iya shirya kayan kumfa tare da madaidaicin dielectric daban-daban a cikin rabbai daban-daban don saduwa da buƙatu daban-daban.
Chen xu et al.gudanar da gwajin matsawa da gwajin sintering akan PTFE, sun tattauna dangantakar da ke tsakanin yawa, ƙarfin matsawa da matsawa modules, da kuma nazarin ƙarfin matsawa na samfurori a ƙarƙashin matakai daban-daban na sintering, kuma an sami mafi dacewa da matsa lamba da tsarin sintepon.Sakamakon ya nuna cewa ƙarfin matsawa na PTFE ya ragu tare da karuwa da matsa lamba, kuma matsi ya karu tare da karuwar matsa lamba.Matsakaicin gyare-gyaren ya kasance 27.5mpa, zafin jiki na sintering shine 380 C, kuma lokacin rufewa shine 4h.
Domin shawo kan rashin amfani na ptfe mai tsabta, irin su juriya mara kyau da kuma babban haɓakar haɓakar thermal, Raytheon yayi nazarin abubuwan da aka cika da tagulla a cikin ptfe, kuma ya faɗaɗa ikon yin amfani da ptfe.A al'ada dumi latsa gyare-gyare na ptfe ne halin da dogon sake zagayowar, matalauta yi, low girma daidaito da kuma santsi, yayin da dumi latsa gyare-gyaren a cikin wannan binciken yana da m aiki hanyoyin, short sake zagayowar da muhimmanci inganta inji Properties.
Lokacin aikawa: Maris-14-2017