Nsakrae a ɛba PTFE Crystalline Structure mu bere a Sintering of PTFE High-Temperature Cloth

Jiangsu Aokai New Materials, adwumayɛfo a wɔyɛ PTFE ntama a ɛyɛ hyew kɛse, kyerɛkyerɛ PTFE ahwehwɛ nhyehyɛe mu nkɔso wɔ PTFE ntama a ɛyɛ hyew kɛse no sintering nhyehyɛe no nyinaa mu kɔ akyiri.

I. Mfitiase Crystalline Nhyehyɛe no a Wɔsɛe no

1. PTFE ahwehwɛ nsɛso ansa na sintering

Ansa na wɔbɛyɛ sintering no, PTFE wɔ hɔ sɛ emulsion asinasin a apete a ɛbata fiberglass ntama ho. Nkɔnsɔnkɔnsɔn a wɔabobɔw a ɛyɛ ahwehwɛ kɛse a ahwehwɛ nketenkete nketenkete a wɔahyehyɛ no fɛfɛɛfɛ wom wɔ ade ketewaa biara mu.

2. Structural nsakrae bere a ɔhyew ma sintering

Sɛ ɔhyew no kɔ soro boro baabi a ɛyɛ hyew (~327°C) pɛ a, ahwehwɛ no nyinaa nwene koraa. Molekyule nkɔnsɔnkɔnsɔn a wɔabobɔw no bue na ɛpaapae, na ɛdan ade a ɛnyɛ nwene. Mfitiase nneɛma nketenkete ahye yera bere a nneɛma nketenkete no bom yɛ ade a ɛkɔ so nwene no, na ɛpaapae mfitiase granular crystalline nhyehyɛe no koraa.

II. Recrystallization Bere a Wɔreyɛ Onwini

1. Nneɛma a ɛyɛ kurukuruwa a wɔhyehyɛ

Sɛ ɛyɛ nwini fi tebea a ayɛ nwini mu a, PTFE san yɛ kristal ntɛmntɛm ma ɛyɛ spherulites a ɛyɛ radially oriented folded-chain lamellae a ɛtrɛw kɔ abɔnten fi mfinimfini nucleation mmeae. Saa spherulites a ɛhyɛn wɔn ho wɔn ho mu yi yɛ ahwehwɛ matrix a ɛkɔ so, na ɛsesa mfitiaseɛ nneɛma nketenkete a wɔahyɛ no ma no.

2. Nsonsonoe a ɛba ahwehwɛ a etwa to mu

PTFE da molecule nkɔnsɔnkɔnsɔn a ɛyɛ den, a ɛyɛ daa kɛse adi, na ɛde ahwehwɛ a ɛyɛ ntɛmntɛm yiye ma wɔ onwini a ɛyɛ ntɛmntɛm mpo ase. Crystallinity a etwa to no taa fi 50% kosi 70%, ɛba fam kakra sen nea ɛwɔ mfitiase emulsion asinasin no mu.

III. Nkɔsoɔ a ɛba wɔ Crystalline Parameters ne Crystal Forms mu

1. Retention a ɛyɛ den a ɛyɛ crystal phase

Bere a PTFE ayɛ nwini akodu dan mu hyew akyi no, ɛkura ahwehwɛ nhyehyɛe a ɛyɛ ahinanan a ɛyɛ den (dan mu hyew mu ahinanan fã), a ɛne ne ahwehwɛ tebea a na ɛwɔ hɔ ansa na wɔayɛ sintering no yɛ pɛ. Nsakraeɛ a ɛba wɔ nhyehyɛɛ mu nyinaa ba wɔ ahwehwɛ kɛseɛ, pɛyɛ ne ne nsɛsoɔ mu sene sɛ ɛbɛba wɔ ahwehwɛ fã a ɛtwa toɔ no mu.

2. Nkɛntɛnso a onwini rate nya wɔ crystal pɛyɛ so

· Onwini a ɛyɛ brɛoo no ma wonya crystallinity a ɛkorɔn, spherulites akɛse ne lamellae a ɛyɛ den, a wɔakyerɛkyerɛ mu yiye, na ɛde nneɛma a ɛyɛ den ne density a ɛkorɔn ba.

· Dum ntɛmntɛm ma crystallinity a ɛba fam koraa, spherulites a ɛyɛ fɛ, ɛnyɛ pɛpɛɛpɛ, na ɛma nneɛma a wɔawie no tumi yɛ nsakrae na ɛyɛ fã bi a ɛda adi yiye. Slow cooling yɛ gyinapɛn ma PTFE ntama a ɛyɛ hyew kɛse na ama wɔadi mfiri ahoɔden ahwehwɛde ahorow ho dwuma.

IV. Interfacial Crystallization Nkɛntɛnso wɔ Fiberglass ne Nea Ɛho Hia Ne Nyinaa

1. Transcrystallization adeyɛ a ɛyɛ nwonwa

Sɛ PTFE nsuo a ɛyɛ nwini wɔ fiberglass ani a, nucleation mmeaeɛ a ɛyɛ den wɔ fiber no ani no ma transcrystallization: columnar crystal layer nyin gyina hɔ ma fiber axis no, soronko koraa wɔ spherulite nsɛsoɔ a ɛwɔ bulk coating no mu.

2. Gradient nhyehyɛe fi fiber interface kosi coating bulk

Wɔ fiberglass nkɛntɛnso ase no, PTFE ahwehwɛ nhyehyɛe no yɛ nsakrae a ɛkɔ soro: transcrystalline layer a ɛbɛn nhama no dannan nkakrankakra kɔ spherulitic nhyehyɛe ahorow mu wɔ inner coating matrix no mu.

3. Nkɛntɛnso a ɛyɛ gyinaesi a ɛwɔ nhyehyɛe mu nsakrae so wɔ PTFE ntama adwumayɛ so

Sintering dan granular folded-chain PTFE crystals: ɛfa melting ne structural breakdown, afei recrystallize ma ɛkɔ so, dense spherulites (a interfacial transcrystalline layers). Eyi dan loose packed powder particles kɔ intact continuous film, a ɛyɛ ade titiriw a ɛho hia ansa na coating no de adwumayɛ a edi mũ a ɔhyew a ɛko tia, friction a ɛba fam, non-stick agyapade ne nnuru corrosion resistance ka ho.

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