Thaum silicon carbide siv lead ua loj hlob, "ib puag ncig" ntawm qhov sib txuas ntawm qhov chaw nruab nrab ntawm cov siv lead ua thiab ntug sib txawv, yog li ntawd qhov kev ntxhov siab ntawm cov siv lead ua ntawm ntug nce ntxiv, thiab ntug siv lead ua yooj yim los tsim "qhov tsis zoo tag nrho" vim muaj kev cuam tshuam ntawm lub nplhaib graphite nres "carbon", yuav ua li cas daws qhov teeb meem ntug lossis nce thaj chaw zoo ntawm qhov chaw (ntau dua 95%) yog ib qho tseem ceeb hauv kev siv tshuab.
Raws li cov teeb meem loj xws li "microtubules" thiab "inclusions" maj mam tswj hwm los ntawm kev lag luam, ua rau cov silicon carbide crystals "loj hlob sai, ntev thiab tuab, thiab loj hlob", cov ntug "comprehensive defects" yog qhov pom tseeb tsis zoo, thiab nrog rau kev nce ntxiv ntawm txoj kab uas hla thiab tuab ntawm silicon carbide crystals, cov ntug "comprehensive defects" yuav raug muab ntau los ntawm txoj kab uas hla thiab tuab.
Kev siv cov txheej txheem tantalum carbide TaC yog los daws qhov teeb meem ntug thiab txhim kho qhov zoo ntawm kev loj hlob ntawm cov siv lead ua, uas yog ib qho ntawm cov lus qhia tseem ceeb ntawm "loj hlob sai, loj hlob tuab thiab loj hlob tuaj". Txhawm rau txhawb kev txhim kho thev naus laus zis kev lag luam thiab daws qhov kev vam khom "kev xa khoom" ntawm cov ntaub ntawv tseem ceeb, Hengpu tau daws qhov teeb meem ntawm cov txheej txheem txheej txheem tantalum carbide (CVD) thiab mus txog qib siab thoob ntiaj teb.
Tantalum carbide TaC txheej, los ntawm qhov kev xav ntawm kev ua tiav tsis nyuaj, nrog sintering, CVD thiab lwm txoj kev yooj yim ua tiav. Txoj kev sintering, siv tantalum carbide hmoov lossis precursor, ntxiv cov khoom xyaw nquag (feem ntau yog hlau) thiab tus neeg sawv cev bonding (feem ntau yog cov saw ntev polymer), coated rau ntawm qhov chaw ntawm graphite substrate sintered ntawm qhov kub siab. Los ntawm CVD txoj kev, TaCl5 + H2 + CH4 tau tso rau ntawm qhov chaw ntawm graphite matrix ntawm 900-1500 ℃.
Txawm li cas los xij, cov yam ntxwv yooj yim xws li kev taw qhia siv lead ua ntawm tantalum carbide deposition, cov tuab ntawm zaj duab xis sib xws, kev tso tawm kev ntxhov siab ntawm cov txheej thiab graphite matrix, cov kab nrib pleb ntawm qhov chaw, thiab lwm yam, yog qhov nyuaj heev. Tshwj xeeb tshaj yog nyob rau hauv qhov chaw loj hlob ntawm cov siv lead ua sic, lub neej ua haujlwm ruaj khov yog qhov tseem ceeb, yog qhov nyuaj tshaj plaws.
Lub sijhawm tshaj tawm: Lub Xya Hli-21-2023