Cov pa roj carbon dawb hauv silicon carbide?

Silicon Carbide (Sic)yog cov khoom siv hluav taws xob zoo siab thiab cov khoom siv sib tua sib tua Txawm li cas los xij, zoo li ntau cov ntaub ntawv muaj kev pab cuam, nws feem ntau muaj cov txheej tsis txaus ntseeg {{}}} cov pa roj carbon dawb yog ib qho tseem ceeb tshaj plaws kom nkag siab. Rau cov tuam txhab, cov neeg yuav khoom, thiab xaus - Cov neeg siv hauv kev sib tsoo, cuam tshuam, thiab tswj cov pa roj hmab dawb los ua kom tau cov khoom lag luam zoo thiab ua tau zoo.

Txhawm rau txhais cov pa roj carbon dawb hauv Sic, peb xub thawj qhov sib txawv ntawm cov carbon thiab dawb carbon hauv cov khoom siv:

 {{0 {}} bars carbon:Qhov no yog cov pa roj carbon siv carbon los ntawm silicon (si) los ua thawj sic crystal qauv (tshuaj lom neeg: SIC). Cov pa roj carbon yog qhov tseem ceeb - Nws muab cov khoom siv tawv nqaij thiab tshuaj lom neeg zoo li cas, xws li Mohs Hardness of 9.2-9.4 thiab siab melting point (~ 2730 degree).
 - pa roj carbon dawb:Hais txog kev siv cov pa roj carbon uas tseem nyob hauv Sic Matrix yam tsis muaj kev sib haum nrog silicon. Nws tshwm sim raws li distrete urs, xws li graphite, amorphous carbon) faib thoob plaws lub puab cov ntaub ntawv. Tsis zoo li cov roj carbon, dawb carbon yog ib qho impurity tsis yog ua haujlwm sib xyaw ntawm Sic.

Cov pa roj carbon monoxide yog ib feem ntawm sic tus qauv; Cov pa roj carbon pub dawb yog ib qho seem ntawm kev ua haujlwm tsis tiav thaum muaj ntau yam khoom lag luam.

Silicon carbide yog feem ntau tsim cov txheej txheem ntawm acheson xuab zeb (sio₂) thiab carbonacite, graphite, roj av muaj hluav taws xob ua kom sov ntawm 2200-2500 degree. Cov tshuaj carbon pub dawb vim tsis tiav Carlicothermal txo ntawm silica, tsav los ntawm plaub yam tseem ceeb:

1. Cov pa roj carbon ntau dhau los hauv cov khoom nyoos:

Txhawm rau kom muaj kev txo qis ntawm silica (siio₂+ 3 C} C} C}} Ce Tsawg ntawm cov pa roj carbon (5% -10% ntau dua li cov stoichiometric piv). Yog tias cov tshuaj tiv thaiv tsis mus ua kom tiav, tsis muaj cov pa roj ntau dhau ntawm cov pa roj carbon seem dawb.

2. Kev faib tawm kub nyob rau hauv rauv:

Cov angeson rauv taws muaj qhov siab - kub (} cov kev tiv thaiv cheeb tsam) thiab qis- kub txheej txheej. Hauv cov cheeb tsam uas muaj cov cua sov tsis txaus (hauv qab 2200 xyoo), silica txo qis tsis tiav, tawm hauv cov carbon ua tsis raug cai nyob rau hauv cov khoom si silic.

3. Cov sijhawm tiv thaiv luv luv:

Rushing cov txheej txheem smelting kom nce cov kev ua tau zoo tuaj yeem tiv thaiv kev hloov pauv ntawm cov pa roj carbon rau cov roj carbon. Qhov no yog ib qho muaj nyob rau hauv qis - tus nqi sic ntau lawm qhov txheej txheem tswj tau tsawg heev.

4. Tsawg {- Zoo Carbonaceous Raw Khoom:

Cov khoom siv cov pa roj nrog cov ntsiab lus tshauv siab (piv txwv li, qis - Cov kab mob qib siab yuav tsis mob li ntawm silica, ua rau cov pa roj carbon ntau dua. Siab -, ntsuab sic) siv hwm hwm cov pa roj carbon monoxide (piv txwv li, roj av me me) kom txo cov teebmeem no.

Kev cuam tshuam kev ua tau zoo

 Hardness thiab hnav tsis kam:Cov pa roj carbon pub dawb cuam tshuam rau lub hardness thiab hnav tsis kam ntawm silicon carbide, feem ntau txo cov khoom siv tag nrho cov khoom siv.

 Thermal Condivity:Cov pa roj carbon pub dawb tuaj yeem txo cov thermal conductivity ntawm cov khoom, cuam tshuam nws kev ua tau zoo hauv high- kev siv kub.

Tshuaj Muaj Peev Xwm

Cov pa roj carbon dawb tuaj yeem cuam tshuam rau kev siv tshuaj tsis ruaj khov ntawm silicon carbide, tshwj xeeb yog thaum muaj kev ua kom muaj kev mob siab.

Cov Khoom Siv Hluav Taws Xob

Nyob rau hauv cov ntawv thov semiconductor, muaj cov pa roj carbon dawb yuav cuam tshuam rau hluav taws xob ntawm silicon carbide, txo nws txoj haujlwm ua cov khoom siv semiconductor.

Nyob rau hauv tsis - Tseem Ceeb Kev Siv, Tsawg dua cov pa roj carbon (tsawg dua lossis sib npaug ntawm 0.5%) tej zaum yuav muaj kev cuam tshuam tsawg tsawg:

-} nrum hlau sib tsoo:Rau kev sib tsoo cam khwb cia hlau (ib qho kuj cov ntaub ntawv mos), ib daim ntaub dawb muaj peev xwm ua raws li cov roj nplua nyeem, txo kev sib txhuam ntawm cov abrative thiab workpiece.
{{0 {}} qis - tus nqi refractories:Nyob rau hauv tsis - high -} pa roj carbon} Cov nqi ntau dua tsis muaj nqi ntau lawm.

{{0 {{}} Q: Puas tuaj yeem tshem tawm cov pa roj carbon monomium kom tiav tag nrho los ntawm sic?
A: Nws yuav luag tsis yooj yim sua kom tshem tawm dawb carbon nkaus {}}}} purity sic muaj cov nyiaj (tsawg dua los yog sib npaug 0.1%. Lub hom phiaj yog kom txo nws raws qib raws nraim nrog cov qauv ntawv thov.
{{0 {{}} Q: yog dawb carbon ntsuab tib yam li graphite hauv sic?
A: Graphite yog ib hom ntawm cov pa roj carbon dawb. Cov pa roj carbon dawb kuj tseem muaj nyob ua cov amorphous carbon lossis Coke cov kab mob- Graphite muaj zog thiab tsawg dua amorphous carbon.
{{0 {{}} Q: puas muaj cov roj carbon dawb cuam tshuam rau sic xim?
A: Yog. Cov ntsiab lus carbon high dawb tuaj yeem ua dub sic tshwm darker lossis duller. Ntsuab sic nrog ntau dhau cov pa roj carbon ntau yuav muaj cov xim greyish hloov ntsuab ntsuab.