Traditional release agents primarily consist of silicone emulsions + mineral oil bases. At casting temperatures >200 degree, lawv decompose:
[Reaction]
C₆H₁₈O₅Si (silicone) + O₂ → SiO₂·nH₂O (silicate gel) + CO₂↑ + H₂O↑
Triple Destruction Mechanism:
1. Pore Blocking: Silicate gels embed 0.05-0.2mm hauv qab ntawm qhov chaw, clogging alumina micro-channels;
2. Gas Traping: CO₂ thiab H₂O vapor ua rau ntawm cov hlau / oxide interface;
3. Interface Weakening: Roj films txo oxide-rau- substrate adhesion (Ntau dua lossis sib npaug li 40% txo).
Thaum lub sij hawm anodizing, daig gases nthuav tawm los ntawm Joule cua sov, rupturing oxide txheej los ua 0.1-2 hli hlwv.
Cov pov thawj sim: Quantifying Release Agent Damage
Cov ntsiab lus tseem ceeb:
- Blister risk increases exponentially when Si >5% (+23% blister tus nqi ib 1% Si nce);
- Residues >0.5μm reduce oxide adhesion by >50%;
- XPS Analysis: Blistered thaj chaw qhia 7.8 ntawm% Si (vs.<0.3 at% in normal zones).
Txheej Txheem Pitfalls: Overlooked Application yuam kev
Txawm hais tias muaj tsawg - cov neeg ua haujlwm silicone, qhov ntsuas tsis raug ua rau tsis ua haujlwm:
1. Tshaj-Txaus (65% ntawm qhov tsis xws luag)
- Cov neeg ua haujlwm tshaj li 150ml / m² tshuaj tsuag ntim ua rau pwm kub sib tsoo
- Cov txiaj ntsig: Cov khoom siv ua kua nkag mus rau qhov chaw casting
2. Kev tshem tawm tsis txaus (qhov yuam kev tseem ceeb)
- Cua- riam siab<0.6MPa or purge time <1.5s
- Cov dej seem evaporates thaum lub sij hawm pwm kaw, ntxiab chav hauv molten hlau
3. Dej paug (Hidden Killer)
- Using hard water (>150ppm Ca²⁺) rau dilution
- Calcium/magnesium ions tsim flocculent precipitates nrog silicones
>Case Study: Lub qhov rooj qhib lub qhov rooj siv 278ppm cov dej tawv tawv pom cov hlwv ntawm 5% mus rau 42%.
Kev daws teeb meem: Plaub kauj ruam txhawm rau tshem tawm kev sib kis
✅ Kauj Ruam 1: Tso Tus Neeg Sawv Cev Rov Qab
- Tshem tawm Silicones: Hloov mus rau nano- cov neeg ua haujlwm ceramic (piv txwv li, Chem-Trend CT-4000 series)
- Precision dilution: 80-120: 1 dej piv (vs . 20-40: 1 pa)
✅ Kauj Ruam 2: Cov txheej txheem tshuaj tsuag Re- engineering
| Parameter|Pauv|Optimized |
|-----------------------|--------------------|----------------------|
| Txau Siab|0.3-0.4MPa|0.6-0.8MPa |
| Cua: Liquid Ratio|1:1|3:1 |
| Cua -Lub Sijhawm Riam|1.0s|Ntau dua lossis sib npaug rau 2.5s |
| Pwm Kub|150-180 degree|220-250 degree
✅ Kauj Ruam 3: Ua kom huv dej
- Nruab RO systems kom ua tiav:
Conductivity Tsawg dua lossis sib npaug li 10μS / cm
Hardness Tsawg dua los yog sib npaug rau 5ppm (raws li CaCO₃)
Silica Tsawg dua los yog sib npaug rau 0.1ppm
✅ Kauj Ruam 4: Ua ntej -Kev Tiv Thaiv Kev Kho Mob
- Ntxiv kev ntxuav ntshav: Ua ntej- kev kho anodizing nrog Ar/O₂ roj
- Parameters: 800W zog, 90s raug, Ntau tshaj los yog sib npaug rau 0.3μm tshem tawm qhov tob
Technological Breakthroughs: Tuag Casting Tsis Tso Tawm Tus Neeg Sawv Cev
Cov kev daws teeb meem tshiab tshem tawm cov neeg ua haujlwm tso tawm tag nrho:
1. Nano-cov txheej txheem sib xyaw:
- CrAlN/TiSiN ntau- txheej txheej (Ntau dua lossis sib npaug rau 3200 HV hardness)
- Coefficient ntawm kev sib txhuam txo mus rau 0.08 rau qhov tseeb "tso-tus neeg sawv cev- dawb" ntau lawm
2. Laser-Textured Pwm:
- Micro-dimple arrays (Ø20μm, qhov tob 5μm) ntawm cov kab sib faib
- Gas-cov nyhuv cushion enables nws pib-ejection, ntse siv nyob rau hauv 5G heatsinks
Nqe Lus Nug Nqi: Ib Lub Plaub Hlis -Induced Recall
Xyoo 2023, lub chaw tsim khoom EV tau rov qab txog 36,000 qhov chaw nres nkoj them vim muaj cov hlwv anodizing, uas ua rau:
- ¥22 lab direct poob
- Kev tshuaj xyuas tsis ua tiav tau qhia txog 27 × ntau dhau ntawm silicon hauv thaj chaw blistered
- Lub hauv paus ua rau: Tsis muaj kev tswj hwm tso tawm cov khoom seem
Engineer lub Epiphany:
>"Cov neeg ua haujlwm tso tawm tsis yog cov khoom siv pabcuam lawv yog 'tus txheej txheem tseem ceeb' txiav txim siab kho qhov chaw zoo."
Thaum cov hlwv tshwm sim hauv cov tso tsheb hlau luam anodizing, tus neeg ua txhaum tiag raug ntaus thaum pwm tso tawm. Txoj kev kho yog nyob rau hauv:
Tshem tawm cov silicones + Precision spraying + Ultra- dej ntshiab + Plasma tu
Plaub qhov thaiv thaiv kev sib kis. Cov chaw tsim khoom siv nano-cov neeg ua haujlwm ceramic qhia cov txiaj ntsig anodizing dhia ntawm 78% mus rau 99.2% tsis yog kev yeej xwb, tab sis tag nrho kev ua tsov rog tawm tsam cov neeg tua neeg zais.
