Ntxiv silicon carbide thaum lub sij hawm cam khwb cia hlau smelting. Rau grey cam khwb cia hlau, vim lub pre-incubation nyhuv ntawm non-equilibrium graphite, qhov kub thiab txias ntawm ib tug loj tus naj npawb ntawm eutectic pawg yog tsim thiab loj hlob tuaj (txo tus txheeb ze undercooling), uas yog zoo rau tsim ntawm A. - hom graphite; Nws tuaj yeem ua tau Raws li tus naj npawb ntawm cov siv lead ua nuclei nce, cov flake graphite ua me me, nce qib ntawm graphitization thiab txo cov nyiam kom whiten, yog li txhim kho cov khoom siv kho tshuab.
Los ntawm ntau qhov kev sim, peb tuaj yeem txiav txim siab zoo dua tias tom qab siv cov khoom siv silicon carbide, silicon carbide tuaj yeem ua kom yaj zoo dua hauv cov casting, txhim kho lub zog ntawm cov casting, thiab txo qhov tshwm sim ntawm cov khoom puas. Tib lub sijhawm, silicon carbide tuaj yeem ua tau zoo dua Nws tuaj yeem hloov ferrosilicon thiab txo cov nqi tsim khoom. Ua ntej siv silicon carbide, yeej ib txwm muaj ntau yam tsis xws luag nyob rau hauv castings, xws li: dawb me ntsis, dents nyob rau hauv castings, tsawg hardness ntawm castings, thiab lwm yam.
Lub sij hawm kom raug ntxiv silicon carbide: Vim tias qhov melting point ntawm silicon carbide hais yog siab, lub sij hawm ntxiv silicon carbide yog qhov tseem ceeb. Yog tias nws ntxiv lig dhau lawm, silicon carbide yuav tsis tag nrho yaj thiab tawg, thiab cov silicon carbide unmelted yuav nyob rau hauv daim ntawv ntawm granules. Nyob rau hauv lub molten hlau, slag ob lub qhov muag yuav raug tsim tom qab lub molten hlau yog poured; Yog tias lub sijhawm ntxiv ntev dhau lawm, lub nucleation tsim los ntawm silicon carbide yuav maj mam ploj tom qab cov hlau molten yog smelted rau lub sijhawm ntev, uas tuaj yeem ua lub luag haujlwm yooj yim. Cov nyhuv silicon-nce.
Yog li ntawd, ua ib lub chaw tsim khoom nrog ntau xyoo ntawm kev paub, kuv xav qhia rau txhua tus neeg tias lub sijhawm ntxiv ntawm silicon carbide yuav tsum tau ua kom zoo. Thaum ntxiv, tus nqi ntawm silicon carbide tsis tuaj yeem ua rau me me, txwv tsis pub cov nyhuv yuav tsis pom tseeb, thiab nplawm kuj zoo heev. Ua li no, cov nyhuv diffusion ntawm silicon carbide yuav zoo dua.
