Pre-oxidation kho kub

Pre-oxidation kho kub

Cov nyhuv tiv thaiv ntawm Al2O3 lossis Cr2O3 hauv oxide zaj duab xis nce nrog qhov kub thiab txias, qhov zoo dua qhov kev tiv thaiv ntawm zaj duab xis. Feem ntau, cov ntsiab lus ntawm lub ntsiab oxide nyob rau hauv zaj duab xis yuav tsum tsis txhob tsawg tshaj li 90 feem pua.

Kev sib raug zoo ntawm cov cua kub ntawm cov hlau-chromium-aluminium hluav taws xob cua sov alloy 0Cr25Al5 thiab Al2O3 cov ntsiab lus hauv zaj duab xis yog qhia hauv daim duab 3-7.

Lub pre-oxidation kub ntawm cov hlau yuav tsum tsis txhob qis dua 1150 degree. Raws li cov ntsiab lus ntawm aluminium alloy nce, lub pre-oxidation kub yuav tsum nce raws li. Ntawm qhov tsis sib xws, qhov kub thiab txias yuav tsum tau qis kom tsim nyog. Txhawm rau tsim cov yeeb yaj kiab tiv thaiv feem ntau yog tsim los ntawm Cr2O3 thiab NiO nyob rau saum npoo ntawm npib tsib xee-chromium thiab npib tsib xee-chromium-hlau hluav taws xob cua sov alloys, qhov cua sov yuav tsum tsis txhob qis dua 900 degree.

Qhov ntev ntawm lub sijhawm tuav txiav txim siab lub thickness ntawm oxide zaj duab xis. Qhov tuab ntawm cov yeeb yaj kiab tiv thaiv oxide feem ntau yog (1 ~ 2) × 10-4 hli. Raws li oxidation tus nqi ntawm cov hlau, nws yuav tsum tau khaws cia rau 4 ~ 8h. Pre-oxidation kho kub thiab tuav lub sij hawm ntawm hluav taws xob cua sov ntsiab ntawm ntau yam alloys

(1) Nws tuaj yeem ua kom qeeb ntawm qhov permeation ntawm oxidizing roj hauv oxidizing nruab nrab thiab txo tus nqi ntawm alloy oxidation.

(2) Hauv cov xov xwm uas tsis yog oxidizing (xws li nitrogen, hydrogen, carburizing gas, sulfide, thiab lwm yam), maj mam txo cov roj nkag mus thiab txo qhov corrosion ntawm alloy.

(3) Nws tuaj yeem txo qhov volatilization poob ntawm hluav taws xob cua sov alloy Cheebtsam hauv lub tshuab nqus tsev lossis tsis tshua muaj siab.

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.

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