Nais phoopiav qhia txogLus teb pauj ib yamSib khi lus sic
Cov yeeb yaj kiab sib xyaw sic muaj cov kws kho tshuab thiab oxidation tsis kam. Nws cov nqi yog tsawg. Nyob rau hauv lub zej zog tam sim no, nws tau nyiam ntau thiab ntau dua kev ua yeeb yam hauv kev lag luam ntau yam.
Sic yog ib txoj kev sib cog lus muaj zog heev. Hauv Sinining, tus nqi diffusion yog tsawg heev. Nyob rau tib lub sijhawm, saum npoo ntawm cov hais feem ntau npog ib qho yooj yim txheej oxide txheej uas ua si lub luag haujlwm ntawm kev sib doltion barrier. Cov ntshiab sic yog tsis tshua sintered thiab compact yam tsis muaj kev sib ntxiv. Txawm hais tias cov txheej txheem kub-nias yog siv, nws tseem yuav tsum xaiv cov tshuaj ntxiv. Tsuas yog thaum muaj kub heev, tuaj yeem siv tau rau kev siv tshuab hluav taws xob ceev kom ze rau qhov ntsuas hluav taws xob ze rau qhov ntsuas ntawm xyoo 1950 ℃ .at tib lub sijhawm, nws yog cov duab thiab loj yuav raug txwv. Txawm hais tias Sic Composites tuaj yeem muab tau los ntawm Vapor deposition, nws tsuas yog txwv kom npaj qis ceev lossis cov ntaub nyias nyias. Vim tias nws lub sijhawm nyob ntev, tus nqi tsim kev tsim khoom yuav nce ntxiv.
Cov tshuaj tiv thaiv sib xyaw SIC tau tsim nyob rau hauv 1950 los ntawm Popper. Tus txheej txheem tseem ceeb yog:
Nyob rau hauv kev txiav txim ntawm capillary quab yuam, ua kua silicary lossis silicon alloy nrog reasive kev ua si uas muaj carbon thiab tsim cov pa roj carbon thiab cov pa roj carlicon hauv cov tshuaj tiv thaiv. Cov neeg carbide tshiab uas tau sib khi ua ke rau cov thawj Silicon Carbide hais hauv Situ, thiab cov chaw ua haujlwm ntawm tus neeg sawv cev ua tiav kom ua tiav cov txheej txheem densification.
Piv nrog lwm cov txheej txheem ntawm silicon carbide ceramics, cov txheej txheem Sintering muaj cov yam ntxwv hauv qab no:
Kev ntsuas kub txo qis, lub sijhawm ua haujlwm luv luv, tsis tas yuav muaj cov khoom siv tshwj xeeb lossis cov khoom kim kim;
Cov tshuaj tiv thaiv sib xyaw nrog tsis muaj shrinkage lossis hloov ntawm qhov loj me;
Diversified Molding txoj kev (Extrusion, txhaj tshuaj, nias thiab ncuav).
Muaj ntau txoj kev ntxiv rau kev ua qauv. Thaum lub sijhawm sintering, loj loj thiab cov khoom sib xyaw ua tau tsim tau yam tsis muaj kev ntsuas. Cov tshuaj tiv thaiv bonded Technology ntawm Silicon Carbide tau kawm rau ib nrab xyoo. Cov thev naus laus zis no tau dhau los ua ib qho ntawm cov tim coruses ntawm ntau yam kev lag luam vim nws qhov tshwj xeeb.
Lub Sijhawm Post: Lub Tsib Hlis-04-2018