Ichi chinyorwa chinobata mashandisirwo ePTFE yakakwirira-tembiricha jira mune kabhoni fiber flat composite zvigadzirwa. Compression molding: yakaiswa pakati pezviumbwa uye prepregs kudzivirira epoxy resin adhesion, zvichiita kuti nyore kudhiza; sandwiched pakati peakawanda matete mapaneru kudzivirira kunamatirana. Vacuum bag molding: reusable kuburitsa firimu pakati pe prepreg uye jira rekufema, kubvumira gasi / resin ndima uku uchigonesa kupepeta nyore mushure mekurapa; textured side inotamisa kunaka kwepamusoro kugadzirwa kuti ivandudze bonding roughness, kubvisa jecha. Kuramba kuchigadzirwa: mabhandi ekutakura asina musono asina tsvimbo anotakura prepregs kuburikidza nekudziya / kudzvanya nzvimbo; cushion layer inogovera kudzvanywa zvakaenzana kuderedza indentations yenzvimbo.

Ichi chinyorwa chinoongorora kugona kwemurazvo kurapwa kwePTFE pamusoro pekugadzirisa uye inoenzanisa mhedzisiro ne corona uye plasma kurapwa. Zvinogoneka: murazvo unogona kushandura PTFE asi isingawanzo shandiswa mumaindasitiri - njodzi dzekuchengetedza (PTFE inoora ichiburitsa chepfu HF uye perfluoroisobutylene); kushanda zvishoma (simba repamusoro chete 30-35 mN / m, inoumba muganhu usina simba). Maitiro ekushanda: murazvo - kwenguva pfupi yakakwirira-tembiricha oxidation (> 1000 ° C), zvishoma etching, mashoma mapoka eokisijeni; corona - high-voltage discharge inogadzira ozone / inoshanda okisijeni, yakapfava oxidation, yakaderera simba density haigone kutyora CF zvisungo; plasma - yakakwirira-simba zvimedu / maerekitironi / emahara radicals anotsemura zvakananga maCF bond uye kubatanidza polar mapoka (hydroxyl, carboxyl, amino).

Ichi chinyorwa chinovhara maitiro ekufananidza kumhanyisa muchina wekumhanyisa uye kureba kweovheni kuti ive nechokwadi chekuti organosilicone inonamira inosvika kune chinangwa chekurapa dhigirii repamusoro-tembiricha yePTFE tepi. Musimboti wekufananidza: nguva yese yekugara t_total = hurefu hweovheni hunoshanda L ÷ mutsara wekumhanyisa v haifanirwe kunge iri pasi penguva shoma inodiwa yekurapa. Wana maitiro ekurapa kuburikidza neDSC kana adhesive kurapa bvunzo inomisikidza 'tembiricha - shoma yekurapa nguva' hukama. Yakaenzana cumulative yekurapa modhi: patsanura hovhoni muzvikamu, verenga ti=Li/v uye tcure(Ti), simbisa ∑(ti/tcure(Ti)) ≥1. Maitiro ekuverengera: isa tembiricha nzvimbo dzine urefu Li uye tembiricha Ti; seta mutsara wekumhanyisa v, kuverenga nguva yekugara yenzvimbo yega yega uye reshiyo yemupiro; iterate kusvika yakazara ≥1 (safety margin 1.1-1.2 yakakurudzirwa).

Ichi chinyorwa chinobata mabasa ePTFE mukupisa kwekuvharidzira kuvharika kweinjini dze missile. Nzira ina: Endothermic decomposition - PTFE depolymerizes pa ~ 400 ° C kusvika kune tetrafluoroethylene (yakanyanya endothermic, ~ 3,000 ° C inopisa gasi exposure), inotora kupisa kukuru uye kubvisa simba rinopisa kubva pamadziro. Transpiration cooling uye gasi film insulation - decomposition magasi (tetrafluoroethylene) inopinda kunze kuburikidza ne micro-pores, kubvisa kupisa kwepamusoro; inoyerera gasi firimu inoparadzanisa yakakwira-tembiricha yekupisa gasi kubva kumadziro, ichidzikisa pedyo-madziro kupisa flux ne> 50%; Gasi firimu rinogadzirisa muganho mbichana velocity / tembiricha, kuderedza kukukurwa kwechikamu.

Ichi chinyorwa chinobata mhedzisiro ye gamma-ray irradiation pane PTFE chimiro uye zvivakwa. Chimiro chemakemikari chinoshanduka: gamma rays inotyora CC main cheni uye CF side cheni (G-value 3.0-3.5), zvichikonzera hombe cheni scission uye drastic molecular weight drop; muokisijeni, mahara radicals anoumba peroxy radicals achiunza acyl fluoride uye carboxylic acid yekupedzisira mapoka (hydrolyzing kuHF). Condensed structure inoshanduka: crystallinity inosimuka pakutanga (yakaderera dose, mafupi maketani anogadzirisazve) zvino inowira (yakakwirira dose, kukanganisa kunokanganisa makristasi); lamellar crystals fragment kuita madiki macrystallites ane akanyangarika kureba kwehurongwa. Kuparara kwepfuma: kureba panguva yekuzorora kunoderera kubva pa0.1 kGy mumhepo, kurasikirwa > 90% pa ~ 1kGy - zvinhu zvinova zvakaoma uye brittle; kunyungudika kunodonha kubva pa327°C kusvika pasi pe310°C; polar mapoka anosimudza zvishoma dielectric kugara / kurasikirwa; kushanduka kwepamusoro kubva kuchena kuenda kune grey / dema nekurasikirwa nekupenya.

Ichi chinyorwa chinovhara nzira dzekudzora crystallinity yePTFE coating paTeflon yepamusoro-tembiricha jira. Kudzimisa mwero wekutonhodza wakanyanya uye unoshanda: Kukurumidza kutonhora (kudzima) kuburikidza nemhepo inotonhora maketeni, roller yekutonhodza kana matangi emvura - cheni dzemamorekuru dzinoomesa chando isati yarairwa, ichigadzira tukristaro tusina kukwana; kukoira kwakapfava, kuomarara nekuita kwakagadziridzwa kusiri kwetsvimbo, kuderedzwa zvishoma kuomarara / kusapfeka. Kutonhora zvishoma nezvishoma (annealing) kuburikidza nechikamu chekuchengetedza kupisa pa10-50 ° C / h kana kutonhora kwechoto - cheni dzemamorekuru dzinoronga zvizere kuita maspherulites makuru akazara; Coating ine kuomarara kwakanyanya, yakasarudzika kupfeka kuramba, yakagadzikana zviyero, kuderedzwa kuchinjika uye kuwedzera brittleness.

Ichi chinyorwa chinovhara mashandisirwo eTeflon yakakwirira-tembiricha jira mune inopisa-mhepo inotenderera sintering mavira. Zvinogoneka: inoshandiswa senge isina-tsvimbo cushion pamabhandi mesh kana matireyi kana tembiricha yechoto ≤260 ° C (yakaderera-kupisa kuomesa, binder kubviswa, slurry kurapa) - inovandudza dhizaini uye kunhonga kugona. Zvakanyanya kurambidzwa panguva dzepakati/pamusoro tembiricha (300-950°C) — PTFE inoora ichiburitsa chepfu HF uye perfluoroisobutylene, midziyo inoora uye ichikonzera chepfu inouraya. Nheyo yekuchengetedza: kana tembiricha yevira isina kujeka kana isingakwanise kuvimbiswa pazasi 260 ° C, usashandise. Zvinhu zvakakosha: kuenderera mberi kwebasa -70 ° C kusvika 260 ° C, kwenguva pfupi 300 ° C; yakanyanyisa isina-tsvimbo uye inertness yemakemikari; yakanakisa magetsi ekudzivirira; kukweshana kwakaderera (~ 0.04); fiberglass base inopa yakakwira tensile simba.

Ichi chinyorwa chinofananidza mutsauko pakati pe infrared radiation kudziyisa uye kupisa-mhepo kutenderera kudziyisa nzira dzekurapa pane zvakachinjika chimiro kufanana kwesilicone adhesive layer. Maitiro ekutamisa kupisa: mhepo inopisa inotsamira pane convection-conduction ine tembiricha inokwira, diki yemukati / yekunze tembiricha musiyano; IR ine kudzika kushoma kwekupinda nekunyura kwakasimba kwepasi (makumi kusvika kumazana emamicrometer) ichigadzira mawere-kusvika-mukati gradient. Mhedzisiro pakufanana kwecrosslink: mhepo inopisa inoita kuti synchronous kurapa mukati nekunze neuniform crosslink density; IR inokonzeresa kuti nzvimbo yepasi igadzire 'ganda firimu' rakakora iro rinotadzisa kupisa kupisa uye kufamba kwemukati cheni, zvichiita kuti crosslink density ichidzike kubva pamusoro kuenda mukati.

Ichi chinyorwa chinovhara yakajairwa mutsara wekumhanyisa renji yeTeflon yakakwirira-tembiricha yejira impregnation yekugadzira mutsara. Nhanho dzekukurumidza: zvigadzirwa zvakajairika (0.08-0.30mm) pa 0.5-3 m / min, yakagadzikana pa 1-3 m / min; zvigadzirwa zvakakora / zvakawanda-zvakaiswa (≥0.4mm) pa 0.3-1 m/min; mitsara yepamusoro-soro ine mahovhoni marefu inogona kusvika 3-6 m/min asi inoda michina. Nzira yezvipingamupinyi: kuomeswa uye sintering inoda nguva yekugara (PTFE inoda 1-3 min pa 380-400 ° C; kusakwana kunokonzera kukanganisa kunamatira / kuputika); kumhanya kunotemerwa nekuomeswa kudiki / sintering nguva pasi pehurefu hweovheni yakatarwa. Zvinhu zvipingamupinyi: yakakwirira yakasimba / viscosity dispersions inopinda zvishoma nezvishoma; machira akakora/akakora anotora mvura uye anotamisa kupisa zvishoma nezvishoma; machira akafara anodiwa kumucheto-pakati mavara akasiyana anoda kukurumidza kudzikiswa. Zvishandiso uye zvemhando yekutengeserana-offs: refu-multi-zone oveni inobvumira kumhanya kwakanyanya.

Ichi chinyorwa chinobata misiyano pakati pePTFE emulsions inogadzirwa nekumiswa kwepolymerization vs dispersion polymerization. Kujekesa: kumiswa kwepolymerization hakugone kuburitsa zvakananga PTFE emulsion; yechokwadi PTFE emulsion inouya chete kubva kupararira kwepolymerization. 'Suspension-method emulsion' inonyatso kumiswa kwevhu kumiswa-polymerized resin micropowders. Dispersion polymerization (primary emulsion): spherical particles (0.1-0.3μm, yakamanikana kugovera), yakagadzikana ne perfluorinated surfactants, yakanyanya kukwira molecular uremu (> 94% crystallinity), yakasimba fibrillation, inoda 380 ° C sintering kuti iite inoenderera yakaoma firimu.