Higher Purity tsis yog ib txwm zoo dua: Vim li cas Silicon Hlau 553 Outperforms 421 hauv Cov Ntawv Pov Thawj Tshwj Xeeb

Hauv kev lag luam thoob ntiaj teb thiab kev lag luam metallurgical, ib qho kev xav tsis zoo tshwm sim: siab dua -puritysilicon hlau= kev ua haujlwm zoo dua qub. Ntau tus neeg yuav khoom txawv teb chaws ua rau cov qib hwm zoo liSilicon hlau 421(Si Ntau dua lossis sib npaug rau 99.0%, Fe Tsawg dua lossis sib npaug rau 0.4%, Al Tsawg dua lossis sib npaug rau 0.2%, Ca Less dua lossis sib npaug rau 0.1%) piv txwv tias kev tswj hwm impurity tau zoo dua. Tab sis nyob rau hauv tiag tiag - ntiaj teb foundry ntau lawm-tshwj xeeb tshaj yog rau siab - ntim, dav- lub hom phiaj castings thiab tej yam txhuas / hlau alloy txheej txheem- qauv- qibsilicon hlau 553(Si Ntau dua lossis sib npaug rau 98.5%, Fe Tsawg dua lossis sib npaug li 0.5%, Al Tsawg dua lossis sib npaug rau 0.5%, Ca Less dua lossis sib npaug rau 0.3%) feem ntau xa cov khoom zoo dua qub, kev ua haujlwm siab ntev, thiab qis tag nrho cov nqi.

Silicon hlau qib yog txhais los ntawm qhov siab tshaj plaws ntawm peb qhov impurities tseem ceeb: Fe (Iron), Al (Aluminium), Ca (Calcium) - peb tus lej ncaj qha mus rau cov kev txwv no (× 0.1%). Hauv qab no yog tus qauv thoob ntiaj teb specification sib piv:

Critical Impurity cuam tshuam rau Casting

Hlau (Fe):Cov ntaub ntawv nyuaj, nkig intermetallic theem (xws li, Al₅FeSi) nyob rau hauv aluminium alloys - tuaj yeem txo elongation tab sis txhim kho hnav tsis kam thiab pwm filling stability hauv tuab - ntu castings.
Aluminium (Al):Reacts nrog nitrogen los ua AlN inclusions, ua rau brittleness hauv steel; nyob rau hauv aluminium alloys, nws refines nplej tab sis muaj peev xwm tsim oxide zaj duab xis yog tshaj - tswj.
Calcium (Ca):Qhov cuam tshuam loj tshaj plaws ntawm qhov sib txawv-Ca tshuaj lom Sr/Na hloov pauv hauv Al-Si alloys, cuam tshuam kev cuam tshuam ntawm cov hlau nplaum, thiab ua cov slag suav nrog. Si553 muaj 3 × Ca dua Si421 (0.3% vs 0.1%).

2.1 Siab -Volume General Aluminium Castings

Silicon 421 tsis muaj zog:

Ultra- qis Al (0.2%) thiab Ca (0.1%) ua rau yaj reactivity dhau rhiab heev. Qhov kub thiab txias me me los yog me me yaj paug ua rau cov nplej tsis sib xws, qhov porosity shrinkage, thiab tsis zoo pwm filling - ua rau cov khoom seem ntau dua hauv ntau lawm.

Qhov zoo ntawm Silicon 553:

Al me ntsis siab dua Al (0.5%) ua raws li lub ntuj grain refiner, stabilizing solidification thiab txo kub tawg nyob rau hauv nyias- phab ntsa, complex castings.
Nruab Nrab Ca (0.3%) tsis muaj tshuaj lom neeg hloov pauv hauv tus qauv Al-Si alloys- nrog rau Sr ntxiv (10-15% ntau dua 421), kev hloov kho cov nyhuv tseem nyob ruaj khov, thiab cov nqi txuag ntawm 553 deb tshaj tus nqi hloov pauv ntxiv.
Zoo dua yaj fluidity thiab pwm filling: Qhov sib npaug impurity profile txo qhov nro saum npoo, txhim kho kab noj hniav kom zoo rau qhov sib txawv thiab txo cov misruns.

2.2 Grey Iron & Ductile Hlau Casting

Silicon 421 tsis muaj zog:

Tsis tshua muaj Ca (0.1%) muab cov chaw nucleation tsis txaus thaum lub sij hawm inoculation. Qhov no ua rau hauv qab -inoculation, tsis sib luag graphite flake/sphere tsim, thiab cov khoom siv kho tshuab tsis sib haum (hardness, tensile zog) hla cov khoom siv -tshwj xeeb hauv tuab- ntu hlau castings.

Qhov zoo ntawm Silicon 553:

Higher Ca (0.3%) ua raws li cov tshuaj ntxiv inoculant, txhawb nqa graphite nag lossis daus thiab txo cov cua txias (dawb hlau tsim) hauv cov ntu tuab.
Balanced Fe / Al impurities tsis ua mob rau graphite morphology hauv cov qib hlau txheem -lawv tswj cov nyhuv inoculation thiab ncua lub sij hawm inoculation ploj, tseem ceeb heev rau cov kab loj loj nrog rau lub voj voog ntev.
Tsis xav tau ntxiv inoculants: Silicon hlau qib 553 lub ntuj impurity profile txo qhov yuav tsum tau ntxiv ntawm cov inoculants tshwj xeeb, simplifying cov txheej txheem thiab txiav cov nqi.

2.3 Tus nqi-Sensitive, Tsis yog-Cimtical Castings

Rau castings qhov chaw tiav thiab ultra- cov khoom siv kho tshuab siab tsis yog qhov tseem ceeb (xws li, kev tsim kho, tsis yog- cov khoom siv tsheb ruaj ntseg), Silicon hlau qib 421 tus nqi purity yog nkim:
421 silicon hlau raug nqi 8-15% ntau dua 553 (vim cov txheej txheem smelting thiab purification nruj).
553 silicon hlau ua tau raws li tag nrho cov kev xav tau ntawm kev ua haujlwm rau cov ntawv thov no- tsis muaj qhov ntsuas qhov sib txawv ntawm qhov kawg casting zoo, tab sis kev txhim kho tseem ceeb.

421 Qib Silicon hlau tseem yog qhov kev xaiv zoo nkaus xwb rau siab -kawg, precision- cov ntawv thov tseem ceeb uas tsis muaj qhov tsis huv- vim qhov tsis xws luag tsis tuaj yeem lees txais:
 Siab -Lub zog Aluminium Alloys (A356, A357 rau aerospace/automotive kev nyab xeeb qhov chaw):Ultra-Al/Ca qis tiv thaiv nkig AlN suav nrog thiab ua kom muaj kev hloov kho Sr tag nrho- tseem ceeb rau kev elongation siab thiab qaug zog.
 Ultra-Thin-Pall Die Castings (tsawg dua lossis sib npaug li 2 hli, cov khoom siv hluav taws xob):Tsawg impurities tiv thaiv oxide inclusions thiab xyuas kom meej flawless nto tiav rau anodizing / pleev xim rau.
 High-Purity Tshwj Xeeb Hlau & Superalloy Castings:Kev tswj hwm nruj ntawm Fe / Al / Ca yuav tsum ua kom tau raws li aerospace / cov khoom siv kho mob.