Teflon high-temperature cloth siamtute chuan crystallinity control nana hmanraw direct leh tangkai ber chu cooling rate regulation a nih thu an sawi. PTFE chu 380°C aia sangah a hmin vek hnuah, a lum laiin crystallization rate temperature sang ber 310~315°C a paltlang chuan molecular chain te chu crystal lattice-ah an insiam a. Cooling rate hian crystal region proportion leh coating microscopic morphology a hril a ni.
1. Crystallinity hniam tak neih nan rapid cooling (quenching) a ni
Sintered cloth surface chu cold air curtain, cooling rollers emaw normal-temperature water tank hmangin rang takin a lum thei a ni. Molecular chain te chu regular leh ordered arrangement hmain frozen a ni a, crystal grain te tak te leh famkim lo tam tak a siam a ni. Coating hmuh chhuah hian soft texture leh toughness tha tak a nei a, optimized non-stick performance a nei a, a hardness leh wear resistance erawh a tlahniam deuh thung.
2. Crystallinity sang tak neih theih nan slow cooling (annealing) a ni
Sintering furnace chhuahna hmunah heat preservation section dah a ni a, a nih loh leh puan chu furnace hmangin 10~50°C/h a hniam hlein tihlum a ni. Hei hian molecular chain te chu a kal tawk tawk a, spherulites lian leh kimchang tak a siam thei a ni. Coating hian hardness sang tak, wear resistance ropui tak leh stable dimensional stability a nei a, chutih rualin flexibility a tlahniam a, brittleness a tipung bawk.
II. Auxiliary Process leh Material Control te a ni
Cooling rate regulation atanga thlirin a hnuaia auxiliary measures te hian PTFE coating crystallinity chu a fine-tune lehzual thei a ni.
1. Sintering temperature leh a vawn hun
Material chu 380~400°C thlenga lum tur a ni a, original crystals te chu a hmin vek theih nan leh thermal history tihbo theih nan hun remchang chhung dah tur a ni. Sintering tling lo chuan residual crystal nuclei a awm ang a, chu chuan final crystallinity sang lutuk leh insem dan inang lo tak a siam ang.
2. Treatment hnua annealing tih thin
Rapid cooling hmanga crystallinity hniam tak nei coatings tan chuan secondary crystal growth leh internal stress elimination chu 300~320°C-a darkar engemaw zat constant-temperature treatment hmanga tihfel theih a ni a, chu chu slow cooling hmanga tihfai a ni a, hei hian coating crystallinity chu a tlem berah a tisang a ni.
3. Raw material molecular a rit zawng
High-molecular-weight PTFE dispersion hian melt viscosity sang tak leh molecular chain mobility hniam tak a nei a, hei hian crystallization rate a ti hniam zawk a ni. Chutiang bawka cooling condition hnuaiah chuan crystallinity hniam tak nei coating siam a awlsam zawk.
4. Nucleating agent dah belh tur
Inorganic filler emaw perfluorinated copolymer emaw dosage tlemte (0.1%~1%) hian heterogeneous crystal nuclei tam tak a pe thei a, crystal grains pawh nasa takin a tithianghlim thei bawk. Crystallinity pum pui chu nasa takin a tidanglam thei lo nain, crystal microstructure chu a ti tha thei hle.
III. Multi-Layer Coating siamna atana enkawlna kimchang
Teflon high-temperature cloth hi impregnation leh sintering process hrang hrang hmanga siam a ni a, zawi zawiin coatings a pungkhawm a, a hnuaia mi ang hian targeted process control a ngai a ni.
1. Interlayer crystallization inmilna
Layer hrang hrang cooling rate inang lo lutuk chuan interlayer crystallinity inmil lo a siam ang a, internal stress a siam ang a, a nasat lutuk chuan coating peeling a thlen thei bawk. Intermediate layer tan mild cooling hman a tha a, production mamawh angin outermost layer tan chauh targeted rapid or slow cooling kalpui a tha.
2. Coating thickness effect a ni
Coating thicker zawkte hian a chung leh a chhung lam layer inkarah asynchronous cooling an tuar thin. Inner layer hian heat dissipation slow vangin crystallinity sang tak a siam duh hle. Unified cooling procedure kalpui hmain coating pumpui temperature inang tlang taka awm theih nan sintering hun hi a remchan dan anga tihzauh a ngai a ni.
3. Cooling laiin tension matching
Cooling section chhunga puan chunglama tension dah hian molecular chain orientation a nghawng a, hei hian crystallization process nen a couple a, jointly hian final crystal morphology leh dimensional stability a tichiang a ni. Coordinated leh precise control chu tih ngei ngei tur a ni.
IV. Crystallinity awm zat (quantitative Detection) a ni
Process siamrem hnua crystallinity finfiah nan Differential Scanning Calorimetry (DSC) hman a ngai a ni. 5~10mg coating sample chu 10°C/min rate-in a lum a, melting enthalpy test nan. Crystallinity hi tested melting enthalpy chu 100% crystalline PTFE (82J/g vel) theoretical melting enthalpy nen then a ni. Bending resistance, wear resistance leh performance test dangte nen khaikhin chuan optimal process window chu hriat theih a ni.
General Operation Principles : Crystallinity hniam tak neih theih nan full sintering hnuah quenching nghal tur a ni; crystallinity sang tak hmuh theih nan 310°C hnaihah temperature awm reng tur a ni a, chu chu full sintering hnuah a lumna slow lutuk tur a ni.
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