Kwemakore akati wandei fluoropolymers yakaita basa rakakura mumakemikari uye maindasitiri akafanana kuchengetedza zvidyarwa nemidziyo kubva mukurwiswa kwemakemikari nehupamhi hwehasha media.Izvi zvinodaro nekuti ivo vanopa zviri nani makemikari kuramba uye kugadzikana kwekupisa kupfuura mamwe mapurasitiki kana elastomeric zvinhu. Kwemakore akati wandei fluoropolymers yakaita basa rakakosha mumakemikari nemamwe maindasitiri akafanana kuchengetedza zvirimwa nemidziyo kubva mukurwiswa kwemakemikari nehupamhi hwakawanda hwehasha. media.Izvi zvinodaro nekuti ivo vanopa zvirinani makemikari kuramba uye kugadzikana kwekupisa kupfuura mamwe mapurasitiki kana elastomeric zvinhu.
Kutevera kuvandudzwa kwePTFE, kuunzwa kwe melt-processable fluorinated ethylene-propylene (FEP) muna 1960 kwakavhura nzvimbo itsva dzekushandisa.PFA, perfluoro-alkoxy polymer iyo yave iri mukubudirira kwekushandisa kwemakore makumi maviri sechinhu chekugadzira, ikozvino inotsiva thermoplastic kuPTFE, ine yakaenzana kupisa uye makemikari kuramba uye yepamusoro zvivakwa zvine ruremekedzo, translucency, permeation kuramba uye simba remagetsi. .
Muindasitiri yemakemikari, ese ari maviri fluoropolymers - PTFE uye PFA - anoshandiswa zvakanyanya muchimiro chemaraini.Kune maumbirwo akareruka, akadai sepombi, bend, T-zvidimbu kana majoini ekuderedza, PTFE inowanzoshandiswa;iyo inoshandiswa nenzira yekunamatira extrusion, gondohwe extrusion kana tepi mhepo-ing.Mumaitiro aya pre-form inogadzirwa yePTFE;izvi zvino sintered ndokupinzwa musimbi workpiece.Kushandisa PTFE pakugadzika kwesimbi zvikamu zvechimiro chakaoma, semavharuvhu nemapombi, zvakanyanya kuoma.Isostatic molding ndiyo nzira inosarudzwa.Mune iyi PTFE poda inozadzwa munzvimbo yakagadzirwa pakati pesimbi yekushanda-chidimbu uye bhegi rerabha rinonyatsogadzirwa kuti rikwane muchimiro chenzvimbo ichaiswa mutsetse.Iyo poda inofanodzvanywa, yozotonhora-inodzvanywa muchimiro chaidiwa.Pakupedzisira, bhegi rerabha rinobviswa uye chikamu chine mutsetse chinopiswa muovheni inopfuura 360?C (680?F).
PFA, iyo thermoplastic material ine yakanyatsotsanangurwa kunyunguduka, inogona kugadziriswa nenzira yekuendesa kuumba kana jekiseni kuumba.Iyo granulate inonyungudutswa muhari yakanyunguduka kana muextruder uye yobva yamanikidzwa kupinda mumudziyo unopisa ne hydraulic press.
Iyi nzira inogonesa yakanyatso madziro-ukobvu kuwanikwa, nekushivirira kwe?0,5 mm, kunyangwe pakamanikana radii uye mune undercuts.Mukuita hapana kupedzisa kwemagetsi kunodiwa, kunze kwekubvisa sprue uye kutsvedzerera zviso zvinosangana zveflange.
Paunenge uchishandisa isostatic molding, zvisinei, huwandu hwakati wandei hwekupedzisa kwemakanika hunodiwa - zvichienderana nehuwandu hwekuomeserwa kwechimiro chekuzadzwa - kuzadzisa zviyero zvaunoda nekunyatso.
Kuenzana kwemadziro-kukobvu kunogona kusiyanisa zvakanyanya, kunyanya kana kune mamwe maumbirwo akaomarara akadai sevhavha housings.
Kunyura uye Permeation
Kusiyana nesimbi, mapurasitiki uye elastomers anotora huwandu hwakasiyana hwe media iyo yavanosangana nayo.Izvi zvinowanzoitika kune organic compounds.Kutora kunogona kuteverwa nekupinda mukati memadziro emadziro.Kunyangwe izvi zvisingawanzo kucherechedzwa nefluoropolymers, zvinogona kurwiswa nekuwedzera kwemadziro-kukora kana nekuisa michina yekupedza nzvimbo pakati pe fluoropolymer lining uye simbi madziro.Zvakaratidzwa zvakajeka kuti maererano nekupinza uye kunyura, yakanyunguduka-yakagadziriswa fluoropolymers sePFA inoratidza zvirinani zvipingamupinyi zvivakwa pane PTFE.
Vacuum Resistance
Vacuum kuramba inodiwa nekuti, mumasisitimu akavharwa emhando inoshandiswa zvakanyanya mukugadzirwa kwemakemikari, kudonha kwetembiricha kunogadzira vacuum muhurongwa, kunze kwekunge ichitoshanda pasi pemhepo yemhepo.Paunenge uchishandisa PFA zviri nyore kuwana yakaringana vacuum kuramba kune lining.Kazhinji lining iri ?anchored?kumadziro esimbi uchishandisa ?njiva-muswe?migero kana migero mu
yekupedzisira.
Iine PTFE granulate iyo yakatonhora-yakaumbwa, zvakanyanya kuoma kuwana ruzha rwekumisa mbiru mumadziro esimbi semigero yakakura yaizodiwa kuitira kubvumira PTFE poda kuyerera mumigero.Zvakawanda, saka, ma bonding agents anoshandiswa pakati pePTFE lining uye imba yesimbi.Nekudaro, nekuda kweiyo anti-adhesive maitiro efluoropolymers uye kushoma kwemafuta kupikisa kwevanosungirirana, PTFE inongoratidza kushomeka kwevacuum kuramba.
Quality Control inodzivirira Cracks uye Voids
Iine PTFE uye PFA linings, iyo dielectric simba inoyerwa kuitira kuona zvikanganiso.Iyi nzira yakavimbika inonongedza kutsemuka uye voids izvo zvinoenda munzira yese kuburikidza nezvinhu asi, nekuda kweinozivikanwa yakakwirira resistivity yefluoropolymers, hairatidzi chero kukanganisa kunotanga 1,5 mm kana kupfuura pasi pevhu (fig. 5) .
Nechikonzero ichi kumwe kuedzwa uchishandisa ultrasonic nzira kunogona zvakare kuiswa.Muedzo uyu unoyera chinhambwe kubva pamusoro peiyo lining kusvika paimba yesimbi.Nekudaro, haina kuvimbika nekuti haipe iyo yechokwadi yeline ukobvu kana pasina kana porosity iripo.Pamusoro pezvo, iyi nzira haigone kushandisa pazvikamu zvidiki kana zvimiro zvidiki zvakaomarara zvine undercuts uye tight radii.
Imwe nzira yekutarisa kuti pane kuremara kwepamusoro senge makatsemuka nema voids ndeye inonzi ?Met-L-Check?dhayi penetrant nzira.Asi nzira iyi inongogumira pakuona kukanganiswa kwepamusoro chete.
Kemikari Mamiriro
PFA, iyo inopenya, inogona kutariswa zvakavimbika.Kutsemuka uye voids pasi pepamusoro zvinogona kuitwa kuti zvionekwe neakakodzera magetsi masosi.Nzvimbo dzisingasvikike mumucheka dzinogona kuongororwa uchishandisa mwenje wemwenje unotonhora uye inochinjika fiber light guides.
Mutengo Kuenzanisa kweLinings
Panyaya yemitengo yezvigadzirwa, PFA inodhura zvakapetwa katatu sePTFE.
Izvi zvisingabatsiri zvinogona, zvisinei, kubhadharwa kana kuderedzwa zvakanyanya, sebasa rezvinhu zvakadai sechimiro chinofanira kuiswa, hukuru hwayo, nhamba yezvishandiso zvinofanirwa kuiswa uye nzira yekugadzirisa inogamuchirwa.Izvi zvinogoneka nekuti PFA haidi gadziriro yemanyorero kana kupedzisa machining nekurasikirwa kwezvinhu zvinoenderana.
Iko kushandiswa kwePFA kwekuisa zvikamu zvakakura kwazvo hakukurudzirwe, nekuti mutengo wakakwira wezvinhu ungaite kuti chikamu chacho chidhure.Imwe pfungwa inofanirwa kuchengetwa ndeye mutengo wezvishandiso, izvo zvisingabhadharwe
apo zvikamu zviduku chete zvezvikamu zvinofanira kuiswa mumutsara.Uyezve, kune miganhu inoshanda kune huremu hwezvinhu zvakaiswa jekiseni izvo michina yekuumba inokwanisa kubata.
Mhedziso
Anopfuura makore makumi maviri ane ruzivo nemaraini ezvikamu zvakasiyana, semuenzaniso vharafu uye pombi dzimba, zvakaratidza kuti PFA ine akawanda mabhenefiti kana yakanyanya kupisa uye makemikari kuramba zviri izvo zvinonyanya kudiwa.
Iko kwakaringana uye kunyangwe kukora-madziro kunogona kuwanikwa nePFA mukana mukuru, kunyanya kana uchishanda nenhau dzine tsika yakasimba yekupararira.
Chiitiko chinoshanda chakaratidzawo kuti PFA inopa zvirinani zvipingamupinyi pane PTFE.
Vagadziri veBromine vanoshuma, semuenzaniso, kuti kudzika kwebromine muPFA kunenge chikamu chimwe muzvitatu pasi pePTFE, apo mamiriro ekushanda akadai senguva, tembiricha uye kumanikidza zvakafanana.
PTFE, kune rumwe rutivi, ichiri kushandiswa zvakanyanya kune zvikamu zvemakemikari mavharuvhu uye mamwe makemikari ekugadzirisa midziyo uko flex fatigue resistance inodiwa.
Mienzaniso yakajairika yemashandisirwo akadai mabhero, pamwe nemadiaphragms mumavharuvhu nemapombi.
Kune zvindori zvechigaro, mapulagi, zvisimbiso uye zvikamu zvakafanana, PTFE chinhu chakakodzera uye chehupfumi.
Chimiro chezvino chezvikamu zvakaita seizvi ndechekushandisa PTFE yakagadziridzwa, sezvo kugadzikana kwayo uye kuoma kwayo kuri pamusoro peiyo yemhando yePTFE.
Tags:PTFE,PFA,PTFE vs PFA
Nguva yekutumira: Kubvumbi-01-2017