Shanduko muPTFE Crystalline Structure Panguva yekuSintering yePTFE High-Temperature Mucheka

Jiangsu Aokai New Materials, inyanzvi inogadzira machira ePTFE akakwira-tembiricha, anotsanangura nezve shanduko yePTFE crystalline chimiro mukati mekuita sintering yePTFE yakakwirira-tembiricha machira.

I. Kuparadzwa Kwekutanga Crystalline Structure

1. PTFE crystalline morphology isati yaita sintering

Isati yanyura, PTFE iripo seakaparadzirwa emulsion particles akanamatira kune fiberglass jira. Chete chega chega chine yakanyanya crystalline yakapetwa-cheni lamellae ine madiki, akarongeka akarongwa mamicrocrystals.

2. Kuchinja kwemaitiro panguva yekupisa kwekupisa

Kana tembiricha yakwira pamusoro pekunyungudika (~ 327 ° C), makristasi ese anonyungudika. Akapetwa maketani emamorekuru anovhurwa uye anotsemuka, achichinja kuita amorphous melt. Yekutanga particle miganhu inonyangarika sezvo zvimedu zvinonyungudutswa muchikamu chinoramba chichinyungudutswa, zvichipwanya zvachose iyo yekutanga granular crystalline chimiro.

II. Recrystallization panguva yekutonhora

1. Kuumbwa kwe spherulitic structures

Pakutonhodza kubva munzvimbo yakanyungudutswa, PTFE inokurumidza kudzokorodza kuumba spherulites inoumbwa neradially oriented folded-chain lamellae inotambanudzira kunze kubva nechepakati nucleation nzvimbo. Aya anopindirana spherulites anovaka inoenderera crystalline matrix, kutsiva iyo yekutanga yakarongedzwa particle chimiro.

2. Kusiyana kwekristallinity yekupedzisira

PTFE inoratidzira yakaomarara, yakajairwa mamorekuru cheni, ichiunza zvakanyanya kukurumidza crystallization mazinga kunyangwe pasi pekutonhora nekukurumidza. Iyo yekupedzisira crystallinity inowanzobva pa50% kusvika 70%, yakaderera zvishoma pane iyo yekutanga emulsion particles.

III. Evolution yeCrystalline Parameters uye Crystal Mafomu

1. Kuchengetwa kwechikamu chekristaro chakagadzikana

Mushure mekutonhora kusvika kukamuri tembiricha, PTFE inochengetedza yakagadzikana hexagonal crystal system (yekamuri-tembiricha hexagonal chikamu), yakafanana neyayo pre-sintering crystal fomu. Yese shanduko yezvimiro inoitika muhukuru hwekristaro, kukwana uye morphology pane yekupedzisira kristaro chikamu.

2. Pesvedzero yekutonhodza mwero pakukwana kwekristaro

· Kutonhora zvishoma nezvishoma kunopa kupenya kwepamusoro, spherulites yakakura uye yakakora, yakanyatsotsanangurwa lamellae, zvichiita kuti zvigadzirwa zvine kuoma kwakakwirira uye density.

· Kudzima nekukasira kunotungamira kune yakadzikira crystallinity, yakatsetseka, isina kukwana spherulites, uye yakagadziridzwa kuchinjika uye semi-kujeka kwechinhu chakapedzwa. Kunonoka kutonhora ndiyo chiyero chePTFE chepamusoro-tembiricha jira kuti isangane nemichina yesimba zvinodiwa.

IV. Interfacial Crystallization Mhedzisiro paFiberglass uye Kukosha Kwese

1. Transcrystallization phenomenon

Kana PTFE inonyunguduka painotonhorera pafiberglass pameso, dense nucleation nzvimbo pafiber pamusoro inokonzera transcrystallization: a columnar crystal layer inokura perpendicular kune fiber axis, zvakasiyana zvakasiyana kubva kune spherulite morphology mukati meiyo yakawanda coating.

2. Gradient chimiro kubva kune fiber interface kusvika pakuputira yakawanda

Pasi pesimba refiberglass, iyo PTFE crystalline chimiro inoumba gradient shanduko: transcrystalline layer iri padhuze nefibers zvishoma nezvishoma inoshanduka kune spherulitic zvimiro mukati memukati coating matrix.

3. Decisive impact yekuchinja kwemaitiro paPTFE jira kuita

Sintering inoshandura granular folded-cheni PTFE makristasi: anonyunguduka uye kuparara kwechimiro, obva aita recrystalline kuita inoenderera, dense spherulites (ine interfacial transcrystalline layers). Izvi zvinoshandura zvimedu zvehupfu zvakasununguka kuita firimu rinoramba riripo, inova ndiyo inonyanya kukosha kuti coating ibudise kushanda kwakazara kunosanganisira kusapisa kwekushisa, kukweshera kwakaderera, midziyo isiri-tsvimbo uye makemikari ekuramba kuita ngura.

Izvo zviri pamusoro pehunyanzvi zvemukati zvinopihwa ne Jiangsu Aokai New Materials Technology Co., Ltd.

Kana iwe uchida kuwana tsanangudzo dzakadzama, mamiriro ekushandisa uye zvigadziriso zvakagadziridzwa zvechigadzirwa chedu chizere chepodfolio chinosanganisira PTFE yakakwirira-tembiricha jira, PTFE yakakwirira-temperature adhesive tepi, PTFE yakakwirira-temperature mesh bhandi, seamless kupisa kupisa bhandi, single-sided PTFE jira, yakakwirira-tembiricha inodzivirira pazasi inodzivirira girazi, tapota taura nesu pazasi-inodzivirira girazi.

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