SiC ib leeg siv lead ua yog ib qho khoom siv semiconductor Group IV-IV uas muaj ob lub ntsiab lus, Si thiab C, hauv qhov sib piv stoichiometric ntawm 1: 1. Nws qhov nyuaj yog qhov thib ob tsuas yog pob zeb diamond.
Txoj kev txo cov pa roj carbon ntawm silicon oxide los npaj SiC feem ntau yog raws li cov qauv tshuaj lom neeg hauv qab no:
Cov txheej txheem tshuaj tiv thaiv ntawm cov pa roj carbon txo ntawm silicon oxide yog qhov nyuaj heev, uas qhov kub ntawm cov tshuaj tiv thaiv cuam tshuam ncaj qha rau cov khoom kawg.
Thaum lub sijhawm ua silicon carbide, cov khoom siv raw yuav tsum tau muab tso rau hauv lub cub tawg uas tiv taus ua ntej. Lub cub tawg uas tiv taus muaj cov phab ntsa kawg ntawm ob qho kawg, nrog rau lub electrode graphite nyob hauv nruab nrab, thiab lub hauv paus ntawm lub cub tawg txuas ob lub electrodes. Ntawm qhov chaw ntawm lub hauv paus ntawm lub cub tawg, cov khoom siv raw uas koom nrog hauv kev sib xyaw ua ntej yuav tsum tau muab tso rau, thiab tom qab ntawd cov khoom siv rau kev khaws cia cua sov yuav tsum tau muab tso rau ntawm qhov chaw. Thaum pib smelting, lub cub tawg uas tiv taus yuav muaj zog thiab qhov kub yuav nce mus txog 2,600 txog 2,700 degrees Celsius. Lub zog cua sov hluav taws xob raug xa mus rau qhov them los ntawm qhov chaw ntawm lub hauv paus ntawm lub cub tawg, ua rau nws maj mam sov. Thaum qhov kub ntawm qhov them tshaj 1450 degrees Celsius, kev sib xyaw ua ke tshwm sim los tsim cov roj silicon carbide thiab cov pa roj carbon monoxide. Thaum cov txheej txheem smelting txuas ntxiv mus, thaj chaw kub siab hauv qhov them yuav maj mam nthuav dav, thiab qhov ntau ntawm silicon carbide tsim tawm kuj yuav nce ntxiv. Silicon carbide tau tsim tas li hauv lub cub tawg, thiab los ntawm kev ua pa thiab kev txav mus los, cov siv lead ua maj mam loj hlob thiab thaum kawg sib sau ua ke rau hauv cov siv lead ua cylindrical.
Ib feem ntawm phab ntsa sab hauv ntawm cov siv lead ua pib lwj vim qhov kub siab tshaj 2,600 degrees Celsius. Cov khoom silicon uas tsim los ntawm kev lwj yuav rov sib xyaw nrog cov khoom carbon hauv qhov them kom tsim cov silicon carbide tshiab.
Thaum cov tshuaj lom neeg ntawm silicon carbide (SiC) ua tiav thiab lub cub tawg tau txias lawm, kauj ruam tom ntej tuaj yeem pib. Ua ntej, cov phab ntsa ntawm lub cub tawg raug rhuav tshem, thiab tom qab ntawd cov khoom siv raw hauv lub cub tawg raug xaiv thiab qib txheej los ntawm txheej. Cov khoom siv raw xaiv tau raug tsoo kom tau txais cov khoom siv granular uas peb xav tau. Tom ntej no, cov khoom tsis huv hauv cov khoom siv raw raug tshem tawm los ntawm kev ntxuav dej lossis ntxuav nrog cov kua qaub thiab alkali, nrog rau kev sib cais sib nqus thiab lwm txoj hauv kev. Cov khoom siv raw ntxuav yuav tsum tau ziab thiab tom qab ntawd tshuaj xyuas dua, thiab thaum kawg tuaj yeem tau txais cov hmoov silicon carbide ntshiab. Yog tias tsim nyog, cov hmoov no tuaj yeem ua tiav ntxiv raws li kev siv tiag tiag, xws li kev ua duab lossis kev sib tsoo zoo, los tsim cov hmoov silicon carbide zoo dua.
Cov kauj ruam tshwj xeeb yog raws li nram no:
(1) Cov khoom siv raw
Cov hmoov me me ntawm silicon carbide ntsuab yog tsim los ntawm kev tsoo cov silicon carbide ntsuab loj dua. Cov tshuaj lom neeg ntawm silicon carbide yuav tsum ntau dua 99%, thiab cov pa roj carbon dawb thiab hlau oxide yuav tsum tsawg dua 0.2%.
(2) Tawg lawm
Yuav kom tsoo cov xuab zeb silicon carbide ua hmoov zoo, muaj ob txoj hauv kev siv hauv Suav teb tam sim no, ib qho yog kev tsoo pob zeb ntub dej tsis tu ncua, thiab qhov thib ob yog kev tsoo siv lub tshuab cua hmoov.
(3) Kev sib cais sib nqus
Txawm siv txoj kev twg los zom cov hmoov silicon carbide ua hmoov zoo, feem ntau siv kev sib cais sib nqus ntub thiab kev sib cais sib nqus tshuab. Qhov no yog vim tias tsis muaj hmoov av thaum sib cais sib nqus ntub, cov khoom sib nqus raug sib cais tag nrho, cov khoom tom qab sib cais sib nqus muaj hlau tsawg dua, thiab cov hmoov silicon carbide uas cov khoom sib nqus coj mus kuj tsawg dua.
(4) Kev sib cais dej
Lub hauv paus ntsiab lus ntawm txoj kev sib cais dej yog siv qhov sib txawv ntawm cov khoom me me silicon carbide ntawm ntau txoj kab uas hla hauv dej los ua qhov kev cais qhov loj me ntawm cov khoom me me.
(5) Kev tshuaj ntsuam xyuas ultrasonic
Nrog rau kev txhim kho ntawm cov thev naus laus zis ultrasonic, nws kuj tau siv dav hauv kev tshuaj ntsuam ultrasonic ntawm cov thev naus laus zis micro-hmoov, uas tuaj yeem daws cov teeb meem kev tshuaj ntsuam xws li kev nqus tau zoo, yooj yim agglomeration, hluav taws xob zoo li qub, fineness siab, ceev ceev, thiab lub teeb tshwj xeeb.
(6) Kev tshuaj xyuas zoo
Kev tshuaj xyuas qhov zoo ntawm cov hmoov me me suav nrog cov tshuaj lom neeg sib xyaw, qhov loj me ntawm cov khoom me me thiab lwm yam khoom. Yog xav paub ntxiv txog cov txheej txheem tshuaj xyuas thiab cov qauv zoo, thov saib "Silicon Carbide Technical Conditions."
(7) Kev tsim cov hmoov av sib tsoo
Tom qab cov hmoov me me raug muab faib ua pawg thiab tshuaj xyuas, lub taub hau khoom siv tuaj yeem siv los npaj cov hmoov sib tsoo. Kev tsim cov hmoov sib tsoo tuaj yeem txo cov khib nyiab thiab nthuav cov saw hlau khoom.
Lub sijhawm tshaj tawm: Tsib Hlis-13-2024