PTFE Impregnation Process-a Cracking awm chhan chu eng nge ni?

PTFE high-temperature fabrics siamtu professional source a nih angin Jiangsu Aokai New Materials hian PTFE (polytetrafluoroethylene) emulsion hmanga impregnation hnua glass fiber puan a crack chhan a sawifiah dawn a ni. Hei hi composite material siamnaah hian process issue tlanglawn tak a ni a, a tlangpuiin drying (moisture leh surfactants paih) emaw high-temperature sintering (PTFE particles te chu continuous film-a melt) emaw a ni tlangpui.

1. Thermal Expansion Coefficient te inmil lohna nasa tak

Hei hi taksa chhan bulpui ber a ni.

Glass fiber leh PTFE inkara thermal expansion coefficient-ah hian danglamna lian tak a awm:glass fiber linear expansion coefficient chu 5×10−6/°C vel a ni a ,PTFE erawh chu 100×10−6/°C atanga 200×10−6/°C vel a ni thung  (glass fiber aiin a let 20 vel a ni).

Cooling lai hian (sintering temperature 380°C–400°C vel atanga room temperature thlengin) PTFE hi glass fiber framework aiin a tlahniam nasa zawk hle. Glass fiber puan hian rigid skeleton angin hna a thawh avangin PTFE hi shrinkage laiin a constrain a, internal tensile thermal stress nasa tak a siam thin. He stress hian PTFE film tensile strength emaw PTFE leh glass fiber inkara interfacial bonding strength emaw a pelh chuan cracking a awm a, chu chuan stress chu a chhuah tir thin.

2. Drying leh Sintering Process te Control dik lo

Impregnated material-a heating parameters hian cracking a nghawng nghal vek a:

·  Heating rate chak lutuk : A bik takin 100°C vel (moisture vaporization rang) leh 200°C–250°C (PTFE sintering hmaa emulsion leh crystalline transition zone-a surfactants te decomposition) ah te. Rapid heating hian solvent leh additives te instantaneous volatilization avanga internal stress leh gas impact a thlen a, chu chuan coating cracking a thlen thin.

·  Cooling rate chak lutuk : Sintering hnua cooling chakna tur ambient air-a direct exposure hian temperature danglamna lian tak avang hian instantaneous shrinkage stress nasa tak a siam a, hei hian fine network crack a thlen awlsam hle.

·  Sintering temperature sang lutuk emaw sintering time rei lutuk emaw : Hei hian PTFE molecular weight a tichhe a, fluidity a tichhe nasa lutuk a, stress hnuaiah material chu a chhe thei zawk a ni.

3. Impregnation Process leh Emulsion Concentration chungchanga harsatna awm thei

Impregnated layer thickness, uniformity leh penetration depth hian cracking sensitivity a nghawng nghal vek a ni:

·  Single impregnation layer thick lutuk : Thickness emaw production efficiency emaw zawn nan pass khatah PTFE coating thick lutuk chu an hnawih thin. Drying leh sintering lai hian thick coating hian solvent lakchhuahna kawng thui zawk a nei a, volumetric shrinkage nasa zawk a tawk bawk (PTFE emulsion hian solid content 60% vel a nei tlangpui a, chu chu roughly 40% moisture lakchhuah a ngai tihna a ni), hei hian surface cracking a thlen fo thin.

·  Uneven impregnation : Localized tam lutuk PTFE buildup emaw, puan chunglama emulsion distribution inang lo emaw chuan concentrated shrinkage stress a thlen thin.

·  Emulsion penetration tling lo : Glass fiber puan hi dewaxed loh emaw, surface-treated tha lo emaw a nih chuan PTFE emulsion hian fiber bundles chhungah a lut kim thei lo va, superficial 'skin film' chauh a siam thin. He film hian substrate nen anchoring chak lo tak a nei a, a lum chuan a detach emaw crack emaw duh hle.

4. Substrate nena inzawm thilte

·  Unde-waxed glass fiber puan : Glass fiber puan hian a puan atanga sizing agents (paraffin, epoxy, etc.) a pai a. Impregnation hmaa high-temperature dewaxing emaw chemical cleaning emaw tel lo chuan heng organic substance te hi a hnu lama sintering neih laiin carbonize leh volatilize an ni a, chu chuan gas a siam a, chu chuan coating chu a tichhia emaw, PTFE leh glass fiber inzawmna a tichak lo emaw a, chu chuan crack a siam thin.

·  Glass fiber puan structure leh thickness : Glass fiber puan thick leh denser zawk (thick satin fabric ang chi) hian rigidity sang zawk a lantir a, PTFE shrinkage-ah restraint chak zawk a nei bawk. Hetihlai hian fiber bundle inkara groove thuk zawkte hian stress concentration leh drying laiin groove edge-ah cracking a thlen thin.

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