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 chinofananidza kurongeka kwematatu ekurapa madhigirii ekuyedza nzira dzesilicone pressure-sensitive adhesives. Solvent extraction (gel content) inoyera insoluble network chikamu kuburikidza neSoxhlet extraction - overestimates nekuda kwezvikamu zvakabatanidzwa mumuviri zvakakanganiswa se crosslinks, kunyatsojeka ± 2-5%, kuderera kwekemikari yakarurama. DSC inoyera kusara kwekuita kupisa (α = 1-ΔHresidual / ΔHtotal) - yakavimbika pakutendeuka kwakaderera-kusvika-pakati asi inofungidzira pakutendeuka kwepamusoro nekuda kwekupararira-zvishoma mapoka akasara, kudzokorora <± 2%.

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 pamadziro, 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 chinovhara yakajairika 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 nekumisa polymerization 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.

Ichi chinyorwa chinoongorora pesvedzero yeplatinamu catalyst mhando uye kutarisisa pane crosslinking kinetics yekuwedzera-kurapa silicone rubha. Catalyst types: Speier catalyst (chloroplatinic acid, Pt⁴⁺) inoda kuderedzwa kune inoshanda yakaderera-valent marudzi, inoshanda se precatalyst; Karstedt catalyst (Pt⁰ ine divinyltetramethyldisiloxane) inopinda zvakananga catalytic cycle. Mhando mhedzisiro: Speier inoratidza yakadudzwa induction nguva ine S-yakaita kurapa curve (inononoka kare, inomhanyisa gare gare) uye yakakwirira inooneka activation simba; Karstedt inoratidza hapana induction, yakakwirira yekutanga mwero ine inopinza exotherm, yakaderera activation simba.