Dawb cam khwb cia hlau: Ib yam li cov suab thaj peb muab tso rau hauv tshuaj yej, cov pa roj carbon dissolves tag nrho hauv cov kua hlau. Yog tias cov pa roj carbon yaj hauv cov kua no tsis tuaj yeem sib cais los ntawm cov kua hlau thaum lub cam khwb cia hlau solidifies, tab sis tseem yaj tag nrho hauv cov qauv, peb hu rau cov qauv tsim dawb cam khwb cia hlau. Dawb cam khwb cia hlau, uas muaj ib tug heev nkig qauv, yog hu ua dawb cam khwb cia hlau vim hais tias nws muaj ib tug kaj, dawb xim thaum tawg.
Grey cam khwb cia hlau: Thaum cov kua cam khwb cia hlau solidifies, cov pa roj carbon yaj nyob rau hauv cov kua hlau, xws li qab zib nyob rau hauv tshuaj yej, yuav tshwm sim raws li ib tug cais theem thaum solidification. Thaum peb tshuaj xyuas cov qauv zoo li no nyob rau hauv lub tshuab kuaj kab mob, peb pom tias cov pa roj carbon tau decomposed rau hauv cov qauv sib cais pom ntawm qhov muag liab qab, hauv daim ntawv ntawm graphite. Peb hu cov cam khwb cia hlau no li grey cam khwb cia hlau, vim hais tias thaum cov qauv no, nyob rau hauv uas cov carbon tshwm nyob rau hauv lamellae, uas yog, nyob rau hauv cov khaubncaws sab nraud povtseg, yog tawg, ib tug dull thiab grey xim tshwm.
Spotted cam khwb cia hlau: Cov hlau cam khwb cia dawb uas peb tau hais los saum toj no tshwm sim hauv cov cua txias ceev, thaum cov hlau cam khwb cia grey tshwm nyob rau hauv qhov txias txias. Yog tias qhov txias txias ntawm qhov dej tau sib txuam nrog ntau qhov kev hloov pauv ntawm dawb mus rau grey tshwm sim, nws tuaj yeem pom tias cov qauv grey thiab dawb tshwm ua ke. Peb hu cov cam khwb cia hlau mottled vim hais tias thaum peb tawg xws li ib daim, grey islets tshwm nyob rau hauv dawb tom qab.
Tempered cam khwb cia hlau: Hom cam khwb cia hlau no yog tiag tiag solidified li dawb cam khwb cia hlau. Nyob rau hauv lwm yam lus, lub solidification ntawm cam khwb cia hlau yog guaranteed kom cov pa roj carbon tseem yaj tag nyob rau hauv cov qauv. Tom qab ntawd, lub solidified dawb cam khwb cia hlau yog raug rau kev kho cua sov kom cov carbon yaj nyob rau hauv cov qauv yog sib cais los ntawm cov qauv. Tom qab qhov kev kho cua sov no, peb pom tias cov pa roj carbon monoxide tshwm sim raws li qhov tsis sib xws spheres, pawg.
Ntxiv rau qhov kev faib tawm no, yog tias cov pa roj carbon muaj peev xwm sib cais los ntawm cov qauv tsim los ntawm kev sib koom ua ke (xws li cov hlau cam grey), peb tuaj yeem ua lwm qhov kev faib tawm los ntawm kev saib cov khoom ntawm cov txiaj ntsig graphite:
Grey (lamellar graphite) cam khwb cia hlau: Yog tias cov pa roj carbon muaj zog ua rau cov txheej txheem graphite zoo li nplooj nplooj, peb xa mus rau cov cam khwb cia hlau xws li grey lossis lamellar graphite cam khwb cia hlau. Peb tuaj yeem txhim kho cov qauv no, uas tshwm sim hauv cov hlau uas muaj cov pa oxygen thiab sulfur siab heev, tsis muaj qhov cuam tshuam ntau vim nws cov thermal conductivity.
Spherical graphite cam khwb cia hlau: Raws li lub npe qhia, peb pom tias hauv cov qauv no, cov pa roj carbon zoo li cov pob graphite. Txhawm rau kom graphite decompose rau hauv cov qauv kheej kheej ntau dua li cov qauv lamellar, cov pa oxygen thiab sulfur hauv cov kua yuav tsum raug txo qis dua ib qib. Tias yog vim li cas thaum tsim spheroidal graphite cam khwb cia hlau, peb kho cov kua hlau nrog magnesium, uas tuaj yeem hnov mob sai heev nrog oxygen thiab sulfur, thiab tom qab ntawd ncuav rau hauv pwm.
Vermicular graphite cam khwb cia hlau: Yog hais tias kev kho magnesium siv thaum lub sij hawm tsim cov spheroidal graphite cam khwb cia hlau tsis txaus thiab cov graphite tsis tuaj yeem raug spheroidized tag, cov qauv graphite, uas peb hu ua vermicular (los yog compact), tej zaum yuav tshwm sim. Vermicular graphite, uas yog ib qho kev hloov pauv ntawm lamellar thiab spheroidal graphite hom, tsis tsuas yog muab cov hlau cam khwb cia nrog cov khoom siv hluav taws xob siab ntawm spheroidal graphite, tab sis kuj txo qis kev nyiam ua tsaug rau nws cov thermal conductivity. Cov qauv no, uas yog suav tias yog ib qho yuam kev hauv kev tsim cov spheroidal graphite cam khwb cia hlau, yog txhob txwm cam khwb cia los ntawm ntau foundries vim qhov zoo hais los saum toj no.
Post lub sij hawm: Mar-29-2023