Kev hloov pauv hauv PTFE Crystalline Structure Thaum Sintering ntawm PTFE High-Temperature Cloth

Jiangsu Aokai Cov Khoom Tshiab, cov chaw tsim khoom ntawm PTFE high-temperature fabric, elaborates ntawm evolution ntawm PTFE crystalline qauv thoob plaws hauv sintering txheej txheem ntawm PTFE high-temperature ntaub.

I. Kev puas tsuaj ntawm Original Crystalline Structure

1. PTFE crystalline morphology ua ntej sintering

Ua ntej sintering, PTFE muaj nyob rau hauv dispersed emulsion hais nrog fiberglass ntaub. Txhua qhov muaj cov crystalline folded-chain lamellae nrog cov me me, zoo zoo nkauj microcrystals.

2. Cov qauv kev hloov pauv thaum lub sij hawm cua sov rau sintering

Thaum qhov kub nce siab tshaj qhov melting point (~ 327 ° C), tag nrho cov crystals tag nrho yaj. Folded molecular chains nthuav tawm thiab disentangle, hloov mus rau hauv amorphous yaj. Thawj particle ciam teb ploj lawm raws li hais fuse mus rau hauv ib tug tas mus li molten theem, tag nrho cov thawj granular crystalline qauv.

II. Recrystallization Thaum Txias

1. Tsim cov qauv spherulitic

Thaum txias los ntawm lub xeev molten, PTFE sai recrystallizes rau daim ntawv spherulites muaj li ntawm radially oriented folded-chain lamellae extending sab nraud los ntawm central nucleation qhov chaw. Cov interpenetrating spherulites tsim ib tug nruam crystalline matrix, hloov tus thawj packed particle qauv.

2. Kev hloov pauv hauv qhov kawg crystallinity

PTFE nta nruj, tsis tu ncua molecular chains, xa cov crystallization ceev heev txawm nyob rau hauv kuj ceev ceev txias. Qhov kawg crystallinity feem ntau yog li ntawm 50% mus rau 70%, marginally qis dua qhov qub emulsion hais.

III. Evolution ntawm Crystalline Parameters thiab Crystal Forms

1. Kev tuav ruaj khov siv lead ua theem

Tom qab txias rau hauv chav tsev kub, PTFE tuav ib tug ruaj khov hexagonal siv lead ua system (chav-temperature hexagonal theem), zoo tib yam rau nws pre-sintering siv lead ua daim ntawv. Txhua yam kev hloov pauv tshwm sim nyob rau hauv crystal loj, zoo meej thiab morphology es tsis yog qhov kawg siv lead ua theem.

2. Kev cuam tshuam ntawm qhov ntsuas cua txias ntawm crystal perfection

· Cov cua txias qeeb yields ntau dua crystallinity, loj spherulites thiab thicker, ntau zoo-txhais lamellae, ua rau cov khoom nrog elevated hardness thiab ceev.

· Ceev ceev quenching ua rau qis crystallinity, finer, tsawg zoo meej spherulites, thiab txhim kho yooj thiab ib nrab pob tshab ntawm cov khoom tiav. Kev ua kom txias qeeb yog tus qauv rau PTFE cov ntaub kub kub kom tau raws li qhov xav tau ntawm lub zog.

IV. Interfacial Crystallization nyhuv ntawm Fiberglass thiab tag nrho qhov tseem ceeb

1. Transcrystallization tshwm sim

When PTFE melt cools on fiberglass surfaces, dense nucleation sites on the fiber surface induce transcrystallization: a columnar crystal layer grows perpendicular to the fiber axis, distinctly different from the spherulite morphology within the bulk coating.

2. Gradient qauv los ntawm fiber ntau interface rau txheej txheej

Raws li kev cuam tshuam ntawm fiberglass, PTFE crystalline qauv tsim ib qho kev hloov pauv: cov txheej txheem transcrystalline nyob ib sab ntawm cov fibers maj mam hloov mus rau cov qauv spherulitic hauv txheej txheej matrix.

3. Kev txiav txim siab ntawm cov qauv kev hloov pauv ntawm PTFE daim ntaub ua haujlwm

Sintering transforms granular folded-chain PTFE crystals: lawv tau melting thiab cov txheej txheem tawg, ces recrystallize mus rau hauv tas li, ntom spherulites (nrog interfacial transcrystalline txheej). Qhov no hloov cov hmoov ntim cov hmoov nplej mus rau hauv cov yeeb yaj kiab tsis tu ncua, uas yog qhov tseem ceeb ua ntej rau txheej txheej kom xa cov kev ua tau zoo nrog rau kev ua haujlwm kub, tsis muaj kev sib txhuam, cov khoom tsis-stick thiab tshuaj corrosion kuj.

Cov ntsiab lus saum toj no yog muab los ntawm Jiangsu Aokai Tshiab Materials Technology Co., Ltd.

Yog tias koj xav tau cov ncauj lus kom ntxaws, daim ntawv thov scenarios thiab cov kev daws teeb meem rau peb cov khoom lag luam tag nrho suav nrog PTFE high-temperature daim ntaub, PTFE high-temperature adhesive tape, PTFE high-temperature mesh belt, seamless heat press belt, single-sided PTFE fabric, high-temperature resistant conveyor belt, PTFE high-temperature mesh belt, seamless heat press belt, single-sided PTFE npuag, high-temperature resistant conveyor belt:

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