Silicon carbide (SiC) yog ua los ntawm quartz xuab zeb, roj av coke (los yog coke coke) thiab ntoo chips raws li raw cov ntaub ntawv los ntawm kub kub smelting nyob rau hauv lub qhov cub tsis kam. Muaj ob txoj kev smelting tseem ceeb. Cov hauv qab no yuav coj koj mus nrhiav.
Txoj kev smelting ntawm silicon carbide:
1. Cov khoom siv tshiab
Cov ntaub ntawv tshiab (silica xuab zeb, roj av coke) ncaj qha thauj mus rau hauv thaj chaw tshuaj tiv thaiv ntawm lub qhov cub rau smelting. Lub hauv paus ntsiab lus ntawm roasting khoom yog thauj cov khoom tshiab nyob rau hauv qab ntawm lub cub tawg thiab lub tshav kub preservation cheeb tsam ntawm ob sab rau roasting, thiab ces muab tso rau roasting khoom nyob rau hauv cov tshuaj tiv thaiv cheeb tsam ntawm lub qhov cub tom ntej rau smelting.
2. Roasting txoj kev
Nws muab faib ua ob hom. Ib qho yog txoj kev tsuas yog thauj cov khoom tshiab rau hauv qab ntawm lub qhov cub rau roasting, uas yog txoj kev tau txais los ntawm ntau lub Hoobkas hauv Suav teb. Lwm qhov yog los thauj cov khoom tshiab rau hauv qab thiab ob sab ntawm lub cub tawg rau ib txhij roasting, uas yog hu ua tag nrho roasting khoom txoj kev. Muaj ob peb lub Hoobkas siv txoj kev no.
Qhov zoo ntawm cov khoom siv raw hauv cov khoom siv tshiab muaj qhov hloov pauv me ntsis, thiab cov qauv ntawm tus nqi yog qhov ruaj khov, yog li qhov zoo ntawm cov khoom kuj tseem ruaj khov. Cov txheej txheem roasting siv qhov kub thiab txias hauv qhov cub kom tshem tawm cov volatiles hauv cov khoom tshiab hauv cov khoom siv roasting, kom cov silica xuab zeb thiab cov roj av coke yog polymerized rau hauv cov khoom ntxeem tau nrog huab cua zoo permeability. Cov khoom roasting ntawm lub qhov cub ntsuab kuj muaj qee cov ntsev diffused los ntawm cov khoom siv tshuaj tiv thaiv. Kev siv cov khoom siv roasting rov qab mus rau lub qhov cub tuaj yeem ua rau cov khoom siv hluav taws xob ntau ntxiv, txo cov khoom siv hluav taws xob, thiab tuaj yeem txo lossis tsis siv cov ntoo chips. Thaum npaj cov khoom siv tshuaj tiv thaiv rau lub qhov cub ntsuab, cov ntsev tsawg tuaj yeem ntxiv dua li cov khoom siv tshiab. Lub tangent point ntawm txoj kev roasting khoom yog hais tias lub thauj ntim ntawm tus nqi yog loj, thiab cov muaj pes tsawg leeg fluctuates heev, uas ua rau kom cov hauj lwm ntawm cov qauv thiab tsom xam, thiab cov qauv ntawm txhua lub cub tawg yuav tsum tau hloov.
Raws li lub purity ntawm silicon carbide, nws yog tsuas yog muab faib ua dub silicon carbide thiab ntsuab silicon carbide, thiab lawv siv kuj txawv.
1. Dub silicon carbidemuaj li ntawm 98.5 feem pua SiC, thiab nws toughness yog siab tshaj li ntawm ntsuab silicon carbide. Nws feem ntau yog siv rau kev ua cov ntaub ntawv uas tsis muaj zog tensile, xws li iav, ceramics, pob zeb, refractory cov ntaub ntawv, cam khwb cia hlau thiab non-ferrous hlau.Ntsuab silicon carbideMuaj ntau dua 99 feem pua SiC thiab muaj cov cuab yeej zoo rau tus kheej.
2. Tsis tas li ntawd, muaj ntau yam tshwj xeeb hauv silicon carbide, uas yog cubic silicon carbide, uas yog ib qho tshwj xeeb ua rau daj-ntsuab siv lead ua, uas feem ntau yog siv rau hauv kev lag luam xov, xws li kev ua cov bearings, nrog cov nyhuv micromachining zoo. .
Vim nws cov khoom ruaj khov, thermal conductivity, me me thermal expansion coefficient thiab zoo hnav tsis kam, silicon carbide muaj ntau lwm yam kev siv ntxiv rau abrasives, xws li: txheej silicon carbide hmoov ntawm turbine impellers los yog lub tog raj kheej blocks los ntawm cov txheej txheem tshwj xeeb. Sab hauv phab ntsa tuaj yeem txhim kho nws qhov hnav tsis kam thiab ua kom lub neej ntev ntawm 1 mus rau 2 zaug; cov qib high-qib refractory siv los ua kom nws tiv taus kev poob siab, me me, lub teeb hauv qhov hnyav thiab siab zog, thiab muaj kev txuag hluav taws xob zoo.
Silicon carbide muaj siab hardness thiab zoo heev thermal conductivity. Nws yog ib qho semiconductor thiab tuaj yeem tiv taus oxidation ntawm qhov kub thiab txias.
