Cov nyhuv ntawm carburizing roj nruab nrab ntawm hluav taws xob cua sov alloy

Cov nyhuv ntawm carburizing roj nruab nrab ntawm hluav taws xob cua sov alloy

Carburizing roj nruab nrab siv nyob rau hauv kev kho mob ntawm cov hlau yog ib tug muaj zog txo nruab nrab. Cov pa roj carbon kev koom tes tuaj yeem muab faib ua ob hom: endothermic thiab exothermic, thiab nws muaj pes tsawg leeg (%) yog raws li hauv qab no.

Gas hom H2 CO CO2 N2

Endothermic type 30~40 20~30 0.1~0.5 margin

Exothermic type 10~15 5~7 5~6 margin

Tsis tas li ntawd, nws kuj muaj activated carbon thiab methane.

Cov kev kho mob carburizing feem ntau yog 900 ~ 950 degree, thiab qhov kub ntawm qhov cua sov tuaj yeem ncav cuag 1000 ~ 1100 degree. Thaum carburizing, cov khoom cua sov yuav tsum tau muab cais tawm ntawm cov roj nruab nrab, txwv tsis pub, cov cua sov yuav raug corroded.

Thaum cov khoom los yog hlau nrog cov roj nplua nyeem uas tsis tau ntxuav, ncaj qha nkag mus rau hauv lub qhov cub rau kev kho cua sov, nws tseem yuav tsim kom muaj zog txo cov roj vim yog decomposition ntawm hydrocarbons, uas yuav corrode hluav taws xob cua sov qhov chaw.

Cov yeeb yaj kiab oxide tiv thaiv yog tib qho kev tiv thaiv los tiv thaiv carburization ntawm hluav taws xob cua sov ntsiab lus. Thaum cov oxide zaj duab xis puas lawm, cov roj txo yuav nkag mus rau hauv cov hlau los ntawm kev puas tsuaj thiab carburize. Lub affinity ntawm chromium, hlau thiab carbon nyob rau hauv hluav taws xob cua sov alloys muaj zog heev, thaum txhuas, silicon, npib tsib xee, thiab lwm yam yog tsis muaj zog heev. Yog li ntawd, thaum cov roj carburizing tiv tauj cov hlau, cov tshuaj tom qab carburizing yuav tshwm sim.

Cov khoom tseem ceeb ntawm kev tiv thaiv oxide zaj duab xis ntawm hluav taws xob cua sov alloy yog: Cr2O3, NiO, Fe2O3 rau nickel-chromium thiab nickel-chromium-hlau alloys, thiab Al2O3, Cr2O3 rau hlau-chromium-aluminium alloys. Cov oxides no muaj qhov kub thiab txias hauv qhov muaj zog txo cov pa roj carbon monoxide. Nws txiav txim siab lub zog ntawm alloy lub carburization kuj.

Thaum qhov kub thiab txias, tom qab hluav taws xob cua kub cua tiv tauj cov pa roj carbon monoxide, cov yeeb yaj kiab tiv thaiv oxide yuav raug rhuav tshem, thiab tom qab ntawd cov pa roj carbon monoxide yuav nkag mus rau hauv cov hlau los ua cov tshuaj tiv thaiv carburizing. Cov tsim carbides yuav ua rau cov nqi ntawm cov hlau tsis kam nce, cov yas kom txo qis, cov tawv nqaij tawm, thiab thaum kawg cov cua sov ua tsis tau sai.

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