Saa asɛm yi ka Teflon ntama a ɛyɛ hyew kɛse (ntama a wɔde fiberglass a wɔde PTFE akata so) a wɔde di dwuma wɔ ahunmu adwumayɛbea ho asɛm. Mmeae titiriw a wɔde di dwuma: Nneɛma a wɔabom ayɛ — gyae ntama/film wɔ autoclave molding, isolation layers, high-temperature conveyor belts ma prepreg production; Engine ne ɔhyew a ɛkorɔn ahobammɔ — ɔhyew insulation ntama, ogya fasu cladding, flexible ɔhyew a ɛkorɔn nkitahodi; Electrical insulation ne wire harness ahobammɔ — cable a wɔde kyekyere engine compartments ne landing gear bays; Wimhyɛn mu nneɛma ne ogya ho banbɔ — ogya ntama/wusiw akwansideɛ a ɛhyia FST gyinapɛn, thermal/acoustic insulation blanket cladding; Ahunmu ne ahunmu dwumadie — multi-layer insulation (MLI) nhyiamu, anti-cold-weld lubrication liners ma owia panel deployment mfiri ne antenna hinges, ɔhyew control ntama.

Saa asɛm yi kyerɛkyerɛ sɛnea PTFE a wɔde kata so no kyekyere fiberglass ntama a ɛwɔ Teflon ntama a ɛyɛ hyew kɛse mu no mu. Nnuru a wɔde bom tẽẽ no ntumi nyɛ yiye esiane PTFE ahoɔden a ɛba fam koraa a ɛwɔ soro nti. Wɔnam: Mfiri a wɔde hyɛ mu (honam fam nkitahodi) — PTFE emulsion hyɛn nhama mu na ɛkyere nhama a wɔaboaboa ano bere a wɔayɛ no sintering akyi; Silane coupling agent pretreatment — yɛ molecule bridge ntam inorganic ahwehwɛ nhama ne organic primer; Chemical primer nsakrae layer — de PAI, PPS, PES anaa PEEK resins a PTFE micropowder di dwuma, a wɔde di dwuma wɔ coupling ayaresa akyi de ayɛ nsakrae layer a ɛyɛ den; Hot-melt adhesive film lamination — FEP anaa PFA sini (melting point 260-310°C) bata PTFE sini a wɔadi kan ayɛ no ho wɔ ntama ho; Gradient nhyehyɛe via impregnation ne sintering cycles pii — dilute kan twam ne binder / coupling agent penetrates deep mu fibers, akyi no kronkron PTFE impregnations, abɔ compositional gradient fi fiberglass to pure PTFE.

Saa asɛm yi ka sɛnea microporous structure design of breathable Teflon (PTFE) high-temperature tape ma mframa a ɛkɔ mu ne insulation ne non-stick su kari pɛ ho asɛm. Core ntawntawdi: mframa a ɛtumi fa mu no hwehwɛ sɛ ntini a ɛbue, bere a insulation hwehwɛ sɛ ɛyɛ den na ɛnyɛ nea ɛbata ho hwehwɛ sɛ ɛwɔ soro a ɛyɛ torotoro. Nsusuwii akwan a ɛkari pɛ: hwɛ sɛnea pore diameter (0.1-2μm, sɛnea ɛbɛyɛ yiye no <0.5μm) so na wɔasiw melt penetration ano na wɔakura breakdown voltage mu; control porosity wɔ 50-70% (≈60% optimal) a wonya Gurley 20-100s/100cc ne dielectric ahoɔden ≥2kV ma 0.13mm sini; fa 3D network pore nhyehyɛe a ɛyɛ tortuosity kɛse (τ≈2.5-4) tom de siw nsu a ɛkɔ tẽẽ no ano; yɛ asymmetric gradient pore nhyehyɛe a dense surface skin layer (1-5μm) ma non-stick/insulation ne porous mu ma breathability; fa super-oleophobic / hydrophobic soro akyi ayaresa a enni pore blockage.

Saa asɛm yi de ano aduru a wɔahyehyɛ a wɔde besiw adhesive nkae ne adhesive mogya ano bere a wɔde PTFE teyp a ɛyɛ hyew kɛse redi dwuma de abɔ PCB sika kɔkɔɔ nsateaa ho ban bere a wɔreyɛ SMT nhyiam no ma. Ntini a ɛde ba nhwehwɛmu: nkae no ba fi huammɔdi a ɛka bom anaasɛ ntamgyinafo a wɔde kɔ baabi foforo mu; mogya fi viscosity drop ne adhesive overflow wɔ reflow ɔhyew ase. Core ano aduru ne tape paw a ɛfata: silicone PSA a bere tiaa mu peak ≥300 ° C, kɔ so ≥260 ° C, ne nyinaa thickness 0.08-0.13mm ne tratraa high-cohesion adhesive layers, ne anti-bleed / residue-free adansedi. Anamɔn asia nhyehyɛe a wɔde di dwuma: pre-lamination ahotew a wɔde IPA; zero-tension lamination a mframa a ɛkɔ nipadua no mu nyinaa; optimized reflow ɔhyew profile a ɔhyew brɛoo (<2 ° C / s); awɔw mu a wɔde yiyi ne ho wɔ 50°C ase wɔ 180° anim; wɔyɛ ho adwuma ntɛm ara wɔ nnɔnhwerew 24 ntam na wɔde di dwuma pɛnkoro pɛ; huammɔdi ho dwumadie ne IPA popa ne 40-50x magnifier nhwehwɛmu. Sɛ wopɛ PCB a ɛwɔ afã abien a, fa teyp foforo si ananmu ansa na woayɛ ɔfã a ɛto so abien ho adwuma.

Saa asɛm yi de akwankyerɛ a wɔahyehyɛ ma wɔ sɛnea wobesiw nwi a ɛbɛba PTFE ntama a ɛyɛ hyew kɛse so bere a wɔreyɛ sintering no ho. Nea ɛde nwi a ɛyɛ nwininwini ba titiriw ne ɔhyew a ɛtwetwe a ɛnyɛ pɛpɛɛpɛ ne adwennwen a ɛnkɔ so pɛpɛɛpɛ. Ano aduru kata adwumayɛ nhyehyɛe a edi mũ so: raw material substrate control (dewaxing/ɔhyew nhyehyɛe a edi mũ de yi emu nhyɛso fi hɔ); impregnation ne drying (nneɛma a ɛyɛ tratraa pii a wɔde kata so, ɔhyew a ɛkɔ soro brɛoo, active drive rollers); sintering fononoo sohwɛ (1-3% overfeed ma ɔhyew shrinkage allowance, closed-loop micro-tension control, transverse ɔhyew biakoyɛ wɔ ±5 ° C, gradient preheating-sintering-cooling curve, mframa-flotation fononoo sɛ ano aduru a eye sen biara, curved spreader rollers onwini ne nhyehyɛe (nwini a ɛyɛ brɛoo nkakrankakra, kɔ so trɛw kosi sɛ ɛbɛba fam 100°C, onwini a edi mũ ansa na woabɔ); intanɛt so hwɛ a wɔde hann a emu yɛ den hwɛ ne infrared scanning.

Saa asɛm yi ka onwini dodow a wɔhwehwɛ bere a PTFE ntama a ɛyɛ hyew kɛse sintering no ho asɛm. Sɛ wɔde sintering wɔ 380-400°C wie a, ɛsɛ sɛ ntama no fa ntɛmntɛm fa 310-315°C crystallization-sensitive beae no. Anyɛ yiye koraa no, onwini dodow a wɔkamfo kyerɛ ne 30-50°C/min (ntama a ɛyɛ tratraa betumi anya 100-200°C/min denam mframa a ɛma onwini so). Nnwini a ɛyɛ ntɛm (dum) ma ahwehwɛ a ɛba fam (45-50%), ɛma nkataho a ɛyɛ mmerɛw, ɛyɛ den a ɛwɔ soro a ɛyɛ torotoro, ɛbata ho denneennen, ɛyɛ adwuma yiye a ɛnyɛ nea ɛbata ho, na ɛko tia delamination ne mpaapaemu. Onwini a ɛyɛ brɛoo (fononoo mu onwini) ma ahwehwɛ a ɛkɔ soro (60-70%), na ɛde nkataso a ɛyɛ den, ɛyɛ mmerɛw a ɛyɛ mmerɛw sɛ ɛbɛtwetwe, ayɛ peeling ne microcracks ba.

Saa asɛm yi de dan mu hyew ne ɔhyew a ɛkorɔn nyin a silicone nhyɛso-te nka adhesive ma PTFE tape toto ho. Ɔhyew a ɛkorɔn a ɛnyin (120-180°C) ma nhama a ɛyɛ den a ɛwɔ crosslinked a ɛwɔ ahoɔden a ɛyɛ den a ɛka bom, na esiw nkae a ɛbata ho bere a wɔayiyi no awie no ano. Ɛnam primer co-curin

Saa akwankyerɛ yi ka PTFE teapɔn a ɛyɛ hyew a ɛkorɔn a wɔpaw ma injection molding demolding ne anti-stick applications ho. Ɔhyew a egyina paw: ≤260 ° C ma general plastics (standard silicone PSA tape, 0.13-0.18mm); 260-300°C ma mfiridwuma plastic a ɛyɛ hyew te sɛ PC, PA66, POM (silicone adhesive a ɛyɛ hyew kɛse, 0.18-0.25mm); 300-400°C ma PEEK, LCP, PPS a ɛbɛn mmirikatufo a wɔyɛ hyew (adhesive tape di nkogu; fa PTFE ntama a adhesive nnim anaa PFA film di dwuma). Nneɛma a egyina paw: tacky nneɛma hia high-release pure PTFE surfaces; ahwehwɛ / mineral ahyɛ nneɛma ma hwehwɛ heavy-duty 0.25mm + wear-resistant tape; nneɛma a wɔde ka ho a ɛporɔw hwehwɛ ade a wɔde nkata so a nnuru ntumi nkɔ mu ne nea ɛyɛ den a ɛwɔ ase; static-sensitive applications hia anti-static tuntum PTFE teapɔn.

Wɔnam PTFE a ɛtwetwe ntama a ɛyɛ hyew kɛse so na ɛyɛ denam PTFE a wɔde kata fiberglass ntama a ahoɔden kɛse wom so, na ɛma ahoɔden a ɛtwetwe, ɔhyew a ɛko tia, nea ɛnkyekyere, nnuru a ɛko tia, ne friction a ɛba fam. Nneɛma atitiriw a wɔde di dwuma ne: mfiridwuma mu nneɛma a wɔde fa nneɛma so (ɔhyew a wɔde kyekyere nneɛma, aduan a wɔde to, ntama a wɔde dry, krataa/film a wɔde twetwe); composite molding release ntama ne ɔhyew press cushion liners; welding ntama a ɛbɔ ho ban ne jackets a wɔde siw ɔhyew ano; anyinam ahoɔden motor ne transformer insulation; bearing ahorow a ɛtwetwe ne nea wɔde gyina nsu afiri mu; nnuru a wɔde yiyi mu ne valve a wɔde siw ano wɔ mmeae a asɛe. Ahoɔden a ɛkorɔn a ɛtwetwe no hwɛ hu sɛ ɛbɛtra hɔ akyɛ wɔ nhyɛso, tetew, flexing mpɛn pii, ne ɔhyew a ɛkorɔn mfiridwuma mu nhyɛso wɔ saa dwumadie ahodoɔ a emu yɛ duru yi mu.

Bere a wɔreyɛ sintering no, PTFE asinasin a ɛwɔ fiberglass ntama so no nwene boro 327°C, na ɛsɛe mfitiase folded-chain lamellae ne nneɛma nketenkete ahye ma ɛyɛ amorphous melt. Sɛ ɛyɛ nwini a, PTFE san yɛ ahwehwɛ a ɛyɛ spherulites a ɛyɛ radially oriented lamellae, a crystallinity yɛ 50–70%. Onwini dodow na ɛkyerɛ sɛnea ahwehwɛ no yɛ pɛ: onwini a ɛyɛ brɛoo no ma ahwehwɛ a ɛkorɔn, spherulites akɛse, ɛyɛ den kɛse; sɛ wodum ntɛmntɛm a, ɛma spherulites a ɛyɛ fɛ na ɛma wotumi yɛ nsakrae yiye.