Hauv cov txheej txheem casting, inoculants yog cov khoom siv tseem ceeb rau kev ua kom zoo casting. Lawv lub luag haujlwm tseem ceeb yog txhawm rau txhim kho cov nplej, txhawb nqa graphitization, thiab txo qis qhov tsis xws luag, ua rau lawv tseem ceeb, tshwj xeeb tshaj yog nyob rau hauv kev tsim cov hlau cam khwb cia hlau thiab cov hlau ductile.
Hauv cov txheej txheem casting, inoculants ua lub luag haujlwm tseem ceeb:
Txhawb graphitization:
Hauv cam khwb cia hlau casting, cov txheej txheem graphitization yog qhov tseem ceeb thaum cov hlau molten solidifies. Inoculants tuaj yeem muab ntau cov graphite siv lead ua cores, txo qhov supercooling ntawm graphitization, ua kom yooj yim rau cov hlau molten kom precipitate graphite thaum lub sij hawm txias, thiab tiv thaiv cov tsos ntawm tsis yog -graphitized lug xws li cementite (dawb cam khwb cia nyiam). Piv txwv li, nyob rau hauv grey cam khwb cia hlau thiab ductile hlau casting, inoculants muaj peev xwm txhawb kev faib ntawm graphite nyob rau hauv ib tug zoo thiab niaj hnub daim ntawv, zam cov tsos ntawm ntxhib flake los yog spherical graphite uas cuam tshuam rau kev ua tau zoo ntawm lub casting.
Grain refinement:
Ua kom muaj pes tsawg tus siv lead ua nuclei hauv cov hlau molten kom cov nplej ntawm cov casting finer tom qab solidification. Cov qauv nplej zoo tuaj yeem txhim kho lub zog, toughness thiab plasticity ntawm casting, thiab txo qhov tsis xws luag xws li shrinkage thiab shrinkage. Cov nplej zoo tuaj yeem cuam tshuam qhov kev nthuav dav ntawm cov kab nrib pleb thiab txhim kho qhov qaug zog tiv thaiv thiab kev ua haujlwm zoo txhua yam ntawm casting.
Txhim kho qhov uniformity ntawm cov qauv:
lub inoculant tuaj yeem ua rau muaj pes tsawg leeg thiab cov qauv ntawm cov hlau molten ntau sib xws thiab txo qhov tshwm sim ntawm kev sib cais. Kev sib cais yuav ua rau muaj qhov sib txawv loj hauv qhov kev ua tau zoo ntawm qhov sib txawv ntawm qhov casting, cuam tshuam rau qhov zoo thiab kev pabcuam lub neej ntawm cov casting, thiab qhov sib ntxiv ntawm cov inoculant yuav pab txhim kho qhov teeb meem no thiab ua kom qhov kev ua tau zoo ntawm txhua qhov ntawm cov casting zoo ib yam.
Txhim kho qhov stability ntawm casting zoo:
nyob rau hauv qhov sib txawv casting tej yam kev mob (xws li txawv pouring kub, txias tus nqi, thiab lwm yam), lub inoculant yuav ua rau cov qauv thiab kev ua tau zoo ntawm lub casting ntau ruaj khov. Txawm hais tias cov txheej txheem casting tsis hloov pauv mus rau qee qhov, cov inoculant tseem tuaj yeem lav qhov zoo ntawm cov casting rau qee yam thiab txo cov seem seem.
Feem ntau siv casting inoculants
Ferrosilicon tsis muaj tshuaj lom
Nws yog ib qho ntawm feem ntau siv casting inoculants, thiab nws cov khoom tseem ceeb yog silicon thiab hlau. Cov feem ntau suav nrog75 ferrosilicon hlau(muaj li 75% silicon),65 ferrosilicon hlau, lwm.Ferrosiliconinoculants kuj tsis tshua muaj nqi thiab dav muaj. Lawv tuaj yeem txhawb nqa graphitization thiab ua kom cov nplej zoo dua. Lawv tau siv dav hauv kev tsim cov khoom ntawm grey cam khwb cia hlau, ductile hlau, thiab lwm yam.
calcium silicon inoculant
Nws yog tsim los ntawm silicon thiab calcium, thiab muaj zoodeoxidationthiab muaj peev xwm desulfurization. Ntxiv nrog rau kev txhawb nqa graphitization, nws tseem tuaj yeem ntxuav cov hlau molten thiab txo qhov cuam tshuam ntawm impurities ntawm qhov zoo ntawm castings. Tib lub sijhawm,calcium siliconinoculant tuaj yeem txhim kho morphology ntawm graphite, ua graphite npas ntau puag ncig thiab zoo, thiab txhim kho lub toughness thiab plasticity ntawm ductile hlau.
Silicon barium inoculant
Nws muaj cov khoom siv silicon thiab barium. Barium caij muaj lub peev xwm muaj zog los txhawb graphitization, tuaj yeem ua lub luag haujlwm inoculating hauv qhov kub thiab txias, thiab txhim kho kev ruaj ntseg ntawm cov nyhuv inoculation.Barium silicon inoculant tshwj xeeb tshaj yog tsim rau qee qhov kev tsim tawm nrog cov kev xav tau siab rau cov nyhuv inoculation, tsis tshua muaj qhov kub thiab txias ceev, xws li kev tsim cov nyias- cov hlau nplaum hlau castings.
Composite inoculant
Nws yog tsim los ntawm ntau yam, xws lisilicon ferro calcium bariuminoculant, silicon ferro strontium inoculant, thiab lwm yam. Cov inoculants sib xyaw ua ke cov txiaj ntsig ntawm ntau lub ntsiab lus, tuaj yeem txhawb nqa graphitization zoo dua, kho cov nplej, txhim kho graphite morphology, txhim kho cov kev ua tau zoo ntawm cov castings, thiab ua tau raws li qhov yuav tsum tau ua ntawm cov khoom sib txawv thiab cov txheej txheem.
Rare ntiaj teb inoculant
muaj cov ntsiab lus tsawg hauv ntiaj teb (xws li cerium, lanthanum, thiab lwm yam). Tsis tshua muaj lub ntiaj teb cov ntsiab lus muaj zog deoxidation thiab desulfurization muaj peev xwm, tuaj yeem tshem tawm cov teeb meem tsis zoo hauv cov hlau molten, thiab tseem tuaj yeem txhawb graphitization, txhim kho graphite morphology, thiab txhim kho lub zog thiab tawv ntawm castings.Rare ntiaj teb inoculantsfeem ntau yog siv rau castings uas yuav tsum tau tshwj xeeb, xws li siab -lub zog ductile hlau castings.
Nyob rau hauv qhov tseeb casting ntau lawm, nws yog ib qho tsim nyog yuav tsum xaiv hom, npaum li cas thiab txoj kev ntawm inoculant raws li cov txheej txheem casting, casting cov ntaub ntawv thiab kev ua tau zoo, thiaj li ua kom tiav qhov zoo tshaj plaws inoculation nyhuv thiab tsim high - zoo castings.
