Hom electrothermal tube electroplating khoom tov

Cov khoom sib txawv ntawm cov khoom sib txawv muaj cov qauv siv lead ua sib txawv, yog li lawv cov nqi diffusion sib txawv. Piv txwv li, cov nitrogen uas tsim qhov sib txawv nrog cov hlau hauv cov khoom sib tov - Qhov diffusion tus nqi hauv cov hlau yog siab dua li hauv - Loj hauv hlau. Ib yam li ntawd, molybdenum, uas tsim cov khoom hloov kho nrog hlau - Lub diffusion ceev nyob rau hauv theem kuj ceev tshaj nyob rau hauv lub - Xiangzhongda. Qhov no muaj feem xyuam rau kev ua haujlwm ntau dua ntawm cov atoms hauv lub cev nruab nrab ntawm lub cubic lattice.

e. Kev sib xyaw ntawm matrix alloy

Cov muaj pes tsawg leeg ntawm cov matrix alloy cuam tshuam rau cov qauv ntawm infiltration txheej. Thaum cov hlau nkag mus, nws tuaj yeem raug kaw - Thaum cov khoom xws li silicon thiab txhuas nyob hauv cheeb tsam, cov pa roj carbon hauv cov hlau yog nyem los ntawm qhov chaw mus rau qhov chaw. Hloov pauv, thaum cov hlau nkag mus, nws tuaj yeem raug kaw - Thaum cov carbides nyob rau hauv cheeb tsam daim ntawv cov ntsiab lus, ib txheej ntawm carbide theem yog tsim nyob rau saum npoo ntawm cov hlau. Thaum chromium infiltrated rau hauv hlau, ib txheej ntawm (Cr, Fe) 7C3 carbide yog tsim. Nyob rau hauv tus txheej txheem ntawm infiltration, carbon tsis tu ncua diffuses sab hauv ntawm cov hlau mus rau saum npoo diffusion, uas yog, nws diffuses nyob rau hauv lub opposite kev taw qhia rau chromium. Yog li ntawd, cov ntsiab lus ntawm cov pa roj carbon monoxide nyob rau saum npoo carbide txheej ntawm cov pa roj carbon siab tuaj yeem ncav cuag 5 feem pua ​​​​mus rau 7 feem pua ​​​​, thiab ib txwm muaj cov pa roj carbon tsis zoo hauv qab txheej txheej ntawm chromizing. Nws tuaj yeem pom tias kev sib nrig sib txawv feem ntau tshwm sim thaum lub sij hawm txheej txheem ntawm cov hlau infiltration.

Cov muaj pes tsawg leeg ntawm matrix alloy kuj cuam tshuam rau lub thickness ntawm infiltration txheej. Qhov twg tuaj yeem raug kaw - Cov ntsiab lus uas nquag tsim carbides nrog cov pa roj carbon monoxide hauv thaj av austenite, thiab qhov tob ntawm infiltration hauv austenite txo qis nrog qhov nce ntawm cov ntsiab lus carbon hauv cov hlau. Cov ntsiab lus no, xws li txhuas, molybdenum, tungsten, thiab titanium, muaj kev sib raug zoo rau kev tsim carbides nrog cov pa roj carbon monoxide thiab ua rau muaj kev cuam tshuam ntau ntxiv ntawm kev txo cov thickness ntawm carburized txheej. Qee lub ntsiab lus, xws li silicon thiab aluminium, tuaj yeem tsim cov qauv nrog hlau Zone, tab sis tsis tsim carbides. Raws li cov ntsiab lus carbon nyob rau hauv cov hlau nce, lub thickness ntawm infiltration txheej lawv tsim nyob rau hauv austenite kuj txo, tab sis nws tsis yog khaus li qub. Qhov laj thawj pom tseeb yog tias qhov kev ruaj ntseg ntawm austenite tau nce, ua rau nws nyuaj rau kev tsim ntawm txheej txheej - Cov kua nplaum.

Nyob rau hauv luv luv, qhov tsim ntawm infiltration txheej yog recombination ntawm cov khoom uas nkag mus rau hauv cov khoom matrix, thiab nws cov txheej txheem thiab cov txiaj ntsig yog nyob ntawm cov khoom thiab kev sib cuam tshuam ntawm cov khoom koom nrog hauv kev sib xyaw ua ke.

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