Calcium silicon alloys (Casi)Feem ntau muaj 20% -35% CA thiab 55% -75% SI, nrog rau cov seem uas tsis impurities (xws li sib npaug ntawm 2%, Fe tsawg dua lossis sib npaug nrog 5%). Cov tub ntxhais ntawm lawv lub peev xwm los txhim kho cov kab nrum hlau nyob hauv cov nyhuv ntawm tes ua haujlwm ntawm cov nyhuv synergistic: "Deoxidation thiab Desulfuration + Inoculation thiab Refinement."
Molten Iron Purification tshuab:Tom qab ntxiv molten hlau, CA nyiam ua kom haum nrog O thiab S}} nuch {1℃{1 degree) thiab CASTATING 2450 degree). Cov duab no ntab rau saum npoo ntawm cov hlau molten ua cov ntsiab lus thiab raug tshem tawm cov ntsiab lus ntawm cov roj av (H₂, N₂) thiab cov tshuaj tsis zoo, yog li ua kom huv cov hlau molten.
Lub inoculation thiab refinement meintism:Si yog tus tseem ceeb graphitizing keeb hauv cam khwb cia hlau thiab tuaj yeem inhibit tsim ntawm hlau dawb (fe₃c). Ib txhij, cov me me iab hauv cov silicon calcium alloy (xws li lub cao - sio₂ composite theem) tuaj yeem ua raws li catalyst rau graphite crystallization. "Heterogeneous nucleatous nucleatous nucleations cov hmoov nplej" ua kom cov qauv mirrite, ua kom zoo dua ntawm microstructure ntawm cam khwb cia hlau.
Cov nyhuv ntawm siliconcalcium alloy ntawm kev txhim kho fluidity ntawm cam khwb cia hlau
Lub fluidity ntawm cam khwb cia hlau ncaj qha txiav txim siab zoo ntawm cov khoom siv tsis zoo (xws li nyias {malled valve lub cev thiab precision zog). Sica Alloy Goldenes fundity los ntawm ob txoj kev tseem ceeb:
Txo cov nro nro thiab viscosity ntawm Molten Hlau:
Cov ntaub ntawv sim qhia tau hais tias ntxiv 0.2%- 0.6%, txo cov kab nrib pleb (loj. Txo qhov tsis xws luag xws li "tsis tiav" thiab "cov kaw txias";
Txhim kho cov taw tes melting thiab suav morphology ntawm Molten Hlau:
SI tuaj yeem txo qis dua eutectic kub ntawm cam khwb cia hlau (los ntawm 1140 {{}} 1145 degree), ncua cov kua tuav lub sij hawm ntawm molten hlau; CA tuaj yeem soften ntse hauv molten hlau. Al₂o₃ suav nrog yog hloov mus rau hauv spherical cao {}} al₂o₃-sidosite, txo qis mus rau cov ntws ntawm molten hlau.
Cov Ntawv Thov Raug Raug:
Thaum ua tau nyias - walled grey cam khwb cia hlau qhov chaw nrog 32%, thiab txhim kho moulding efficiency los ntawm 30%.
Kev ua kom zoo ntawm cov neeg kho mob tshuab ntawm cam khwb cia hlau los calcium -} silicon alloy
| Nrum Hlau Hom | Silicon calcium ntxiv tus nqi | Tensile lub zog nce | Hardness (HB) nce | Qhov Cuam Tshuam Toughness nce | Tub Ntxhais Ua Haujlwm Txoj Cai |
|---|---|---|---|---|---|
| Grey cam khwb cia hlau | 0.3%-0.6% | 10%-18% | 8%-12% | 20%-30% | Rov qab qhib hluav taws xob graphite, txo nws cov nyhuv txiav rau ntawm matrix. |
| Zas cam khwb cia hlau | 0.4% -0.8% (Siv nrog rau cov neeg sawv cev sib txuas lus) | 15%-25% | 10%-15% | 25%-40% | Txhawb nqa graphite spheroidization (nce spheroidous tus nqi ntawm 805% rau ntau tshaj 95%), ua kom zoo tshaj plaws ntawm ferrite / petlite piv. |
| MalloLaterite cam khwb cia hlau | 0.2%-0.4% | 8%-15% | 5%-10% | 30%-50% | Tsim cov ntaub dawb hlau thiab kho cov noob pearlite. |
Kev ua kom zoo ntawm cam khwb cia hlau casting zoo los ntawm calcium -} silicon alloy
Txo ntawm porosity thiab shrinkage tsis xws luag
Pority tswj:
The deoxidizing and desulfurizing effects of calcium silicon alloy can reduce the oxygen content in molten iron from 80-100ppm to 30-50ppm and the hydrogen content from 5-8ppm to 2-3ppm, thus reducing the porosity of cast iron parts from 8%-12% to 3%-6% (a reduction of 30%-50%).
Shrinkage tswj:
Cov nyhuv inoculating ntawm calcium - cua silicon alloy txhawb nqa exudation ntawm graphite. Lub ntim nthuav thaum graphite crystallization (kwv yees li 2%) tuaj yeem them rau cov khoom sib zog ntawm Molten
Txhim kho qhov zoo ntawm cov cuab yeej
Refining Saum Leg:
Calcium silicon ua kom muaj cov nplej cov nplej reetings, txo cov npoo av (RA) los ntawm 6.2-1.6 μm, yog li txo cov nqi tom tsev tom qab.
Suppressing saum npoo degrom:
CA tuaj yeem tsim cov tuab huv sio - ni olide cov duab, "thaum tseem txo cov tshuaj pleev ib sab thiab txhim kho cov cuab yeej pov thawj ua pov thawj.
Cov ntsiab lus tseem ceeb thiab xaiv cov lus pom zoo rau kev siv calcium -} silicon alloy
Txheej Txheem Tswj
Xaiv loj:
For large castings (>50kg),10-50mm Bagby Cacium Silicon Alloyyog tsim nyog los xyuas kom meej cov tshuaj tsis zoo; Rau cov me precision kab nrib pleb
Sij hawm ntawm ntxiv:
Rau cov hlau canium, calcium - sharion alloy yuav tsum tau ntxiv 30-60 seconding tus neeg sawv cev ntawm CA thiab tus neeg sawv cev sib txawv (xws li mg); Rau Grey cam khwb cia hlau, nws tuaj yeem ntxiv 1-2 feeb ua ntej tapping txhawm rau txhim kho cov txiaj ntsig inoculation;
Tus nqi tswj:
Zam kev ua kom dhau ntau (piv txwv li, tshaj li 1.0%), txwv tsis pub tawv thiab CACTs me me yuav tsim tawm, ua rau muaj kev txo qis ntawm cov hlau cam khwb cia ntawm cov hlau cam khwb cia.
Qeb Yuav Xaiv
Zoo tib yam Grey cam khwb cia hlau:
Xaiv Ca20 - SI60 hom Silicon-calcium Alloy (CA cov ntsiab lus 20% -25%) rau kev sib npaug nqi thiab cov nyhuv;
High -}} xaus cua fais fab tuag (xws li cua tshuab hluav taws xob (Ca cov ntsiab lus 28% -35%) kom ntseeg tau tias muaj kev coj dawb huv thiab kev coj dawb huv;
Thin - walled Precision Castings:
Xaiv qis -} Aleâ aluminium silicon {} pcine} calcium alloy (ib tsawg dua los yog sib npaug los ntawm 1%) kom tsis txhob suav nrog fluidity.
