Sintering is the critical step where PTFE particles melt, flow, and fuse into a continuous, dense film that bonds to the fiberglass substrate. Yog hais tias lub sij hawm tuav yog luv dhau, lub txheej tseem ntxeem tau thiab tsis muaj zog. Yog tias ntev dhau lawm, PTFE degrades, tso cov pa roj carbon monoxide thiab tig nkig.
Qhov tseem ceeb parameter yog tuav lub sij hawm - lub sij hawm tom qab lub txheej txheej mus txog rau sintering kub (feem ntau 370-400 ° C). Qhov no tsis yog tsuas yog lub sijhawm lub qhov cub kub kub; nws yog lub sijhawm ntaub nws tus kheej yog saum lub melting point.
Aokai PTFE tau optimized sintering tsis hla ntau cov khoom kab. Phau ntawv qhia no suav nrog kev tuav lub sij hawm rau ntau hom cub tawg, cov ntsiab lus cuam tshuam, thiab qhov tsis xws ntawm lub sijhawm tsis raug.
Lub hauv paus ntsiab lus - Dab tsi 'Tuav Sijhawm' txhais tau tiag tiag
1. Lub hom phiaj tseem ceeb
Kom tso cai rau PTFE hais kom tag nrho yaj, ntws, thiab fuse saum lawv cov melting point (kwv yees. 327 ° C ), ua ib tug nruam thiab ntom zaj duab xis uas ua tiav nruj mechanical interlocking nrog fiberglass substrate.
2. Kev sib txawv tseem ceeb
Tuav lub sij hawm yog hais txog lub sijhawm ruaj khov tom qab cov txheej txheej txheej mus txog qhov kub thiab txias (feem ntau yog 370-400 ° C), es tsis yog lub sijhawm ntawm qhov kub ntawm qhov cub nyob twj ywm.
Nws yog ib qho tseem ceeb kom ntseeg tau tias tag nrho cov thickness ntawm cov fiberglass ntaub (xws li cov resin daig ntawm sab hauv fiber bundles) ncav cuag lub melting kub thiab tuav rau lub sij hawm txaus. Qhov kub nyob ib leeg tsis txaus - cov txheej sab hauv yuav tsum yaj.
Kev siv ntau yam rau cov txheej txheem
1. Nruam sintering rauv
Lub qhov cub kub teeb: Ntau thaj chaw cua sov nrog thaj chaw siab kub teem rau 380-400 ° C (txog 410 ° C rau qee qhov kev tsim kho).
Lub sijhawm nyob zoo (tuav lub sijhawm) hauv thaj chaw kub siab:
Npuag Thickness
Pom zoo tuav lub sij hawm
Cov ntaub nyias nyias (0.08-0.15mm)
30-90 feeb
Npuag (0.15-0.30mm)
90 - 180 vib nas this (1.5 - 3 min)
Cov ntaub hnyav hnyav (0.30-0.50mm +)
3-5 feeb los yog ntev dua
Kev kho kom haum: Kho kab nrawm raws li qhov ntev ntawm lub cub tawg - txo cov ntaub mus los kom ntev mus rau qhov chaw nyob qhov kub thiab txias.
2. Batch (box-type) sintering rauv
Tuav qhov kub thiab txias ntawm 380-390 ° C tom qab cua sov:
Hom khoom
Pom zoo tuav lub sij hawm
Ib leeg-coated fiberglass ntaub
5 - 15 feeb (lub sij hawm los ntawm thaum cov ntaub nto hits lub hom phiaj kub)
Multi-impregnated los yog laminated khoom
15 - 30 feeb (kom lav qhov kub thiab txias)
Ceeb toom: Lub thawv rauv raug kev kub ntxhov tsis sib xws. Yuav tsum muaj huab cua siab tshaj tawm, thiab tuav lub sijhawm yuav tsum tau txuas ntxiv kom tsim nyog kom tsis txhob muaj kev sib tsoo ntawm cov txheej sab hauv.
Kev soj ntsuam cov qauv thiab cov lus qhia ua kom zoo tshaj plaws
1. Tsim qhov kub-lub sij hawm nkhaus
Siv lub cub tawg kub tracker los sau cov ntaub ntawv ntawm lub sijhawm tiag tiag thiab xyuas kom meej tias lub sijhawm melting zoo tshaj 370 ° C. Qhov no yog txoj kev ntseeg siab tshaj plaws kom paub meej tias lub sijhawm tuav tiag tiag.
2. Kev tshuaj xyuas qhov muag pom
Tag nrho sintered PTFE txheej tam sim no:
Uniform semi-pob tshab rau tag nrho cov pob tshab zoo li (vim nrog tuab)
Tsis muaj chalky unmelted hais
Flexible kov (tsis tawv los yog nkig)
3. Adhesion xeem
Tsis muaj tev lossis hmoov residue tom qab daim kab xev rub los yog rov khoov dua (fold / unfold 5-10 zaug).
4. Kev tshuaj ntsuam xyuas kev puas tsuaj
Txiav ntaub cross-section qhia:
Tsis muaj dawb unmelted hais nyob rau hauv
Fiberglass yarns tag nrho wetted los ntawm molten PTFE cob
5. Kev ntsuas kev nyab xeeb thiab yuam kom txias
Ua kom muaj zog tso pa tawm kom tiv thaiv kev sib sau ntawm cov khoom siv tshuaj lom (perfluoroisobutylene, HF) los ntawm PTFE decomposition
nruj me ntsis cap siab tshaj plaws kub thiab tuav lub sij hawm
Tam sim ntawd pub npuag rau hauv qhov chaw txias txias tom qab qhov kub-kub kom txias hauv qab 300 ° C sai sai - cua txias ceev yuav pab txhawm rau txhawm rau fused microstructure
Summary - Phau Ntawv Qhia Tuav Lub Sijhawm Ceev
Rauv hom
Npuag Thickness
Pom zoo tuav lub sij hawm
Nruam (multi-zone)
Nyias (0.08-0.15mm)
30-90 feeb
Nruam (multi-zone)
Nruab nrab (0.15-0.30mm)
90-180 feeb
Nruam (multi-zone)
Hnyav (> 0.30mm)
3-5+ feeb
Batch (lub thawv-hom)
Ib lub tsho loj
5-15 feeb
Batch (lub thawv-hom)
Multi-coat / laminated
15-30 feeb
Txoj cai dav dav: Txais lub sijhawm tuav tsawg kawg nkaus uas ua kom tiav cov txheej txheem melting, theem, thiab xoom unmelted puab cores - kom txo tau thermal degradation.
