Nqus txheej DLC txheej txheem, DLC txheej txheem Taw qhia
Jan 11, 2022| Nqus txheej DLC txheej txheem, DLC txheej txheem qhia
Pob zeb diamond zoo li cov pa roj carbon (Pob zeb zoo li cov roj carbon rau luv DLC) yog ib hom amorphous carbon, uas qhia tau hais tias muaj ntau yam khoom zoo ib yam li Pob Zeb Diamond. DLC feem ntau siv pob zeb diamond zoo li microstructure ua cov khoom siv txheej. Txhawm rau kom paub meej lub tswv yim ntawm pob zeb diamond zoo li cov pa roj carbon monoxide, peb thawj zaug kawm txog cov ntsiab lus carbonCarbon cov ntsiab lus dav dav hauv qhov xwm txheej. Pob zeb diamond, graphite, fullerenes, carbon nanotubes, thiab lwm yam yog tsim los ntawm cov ntsiab lus carbon. Cov pa roj carbon monoxide muaj peb hom hybrid bonds, SP1, SP2, thiab SP3, thiab sib txawv ua ke ntawm peb daim ntawv cog lus tsim cov qauv molecular sib txawv, yog li qhia cov khoom sib txawv Thaum cov pa roj carbon atoms sib raug zoo nrog sp3 hybridized orbitals, pob zeb diamond yog tsim. Thaum carbon atoms yog covalently bonded nrog SP2 hybridized orbitals, graphite yog tsim. Thaum cov pa roj carbon atoms sib xyaw thiab hybridized nrog SP2 hybridized orbitals, pob zeb diamond zoo li cov pa roj carbon monoxide yog tsim Cov yeeb yaj kiab zoo li pob zeb diamond feem ntau siv rau hauv daim ntawv siab hardness pob zeb diamond zoo li zaj duab xis. Cov amorphous carbon zaj duab xis nrog siab resistivity, zoo optical zog, thiab cov cim tribological. Cov khoom tsim muaj cov khoom sib txawv vim yog cov qauv sib txawv ntawm cov pa roj carbon atoms thiab cov pa roj carbon atoms: Pob zeb diamond carbon thiab carbon yog sib koom ua ke ntawm SP3 daim ntawv cog lus; Graphite (graphite) carbon nyob rau hauv daim ntawv ntawm SP2 daim ntawv cog lus; Raws li tau piav qhia hauv kev taw qhia, pob zeb diamond- zoo li (DLC) carbon yog ib daim ntawv metastable ntawm amorphous carbon generated los ntawm kev sib txuas ntawm SP3 thiab SP2 daim ntawv cog lus. Nws tsis muaj cov ntsiab lus nruj thiab tuaj yeem suav nrog amorphous carbon nrog ntau yam ntawm cov khoom, yog li nws muaj ob qho tib si zoo heev ntawm pob zeb diamond thiab graphite.Yog li ntawd, DLC zaj duab xis muab tau los ntawm pob zeb diamond zoo li zaj duab xis kuj yog ib qho metastable, ntev-ntau cov khoom tsis zoo amorphous, thiab hom kev sib koom ua ke ntawm carbon atoms yog covalent daim ntawv cog lus, feem ntau suav nrog sp2 thiab SP3 hybrid bonds, thaum muaj qee tus lej ntawm CH bonds hauv DLC zaj duab xis uas muaj hydrogenConsists ntawm ob qho tib si los yog sib txawv atomic orbitals symmetry axis kev taw qhia raws lub orbit sib tshooj rau ib leeg. tsim ib daim ntawv cog lus, hu ua sigma sigma yuam sij yog atomic orbital overlap thiab daim ntawv raws li axis kev taw qhia, ib tug loj degree ntawm overlap, yog li cov sigma ruaj khov sigma yuam sij yuav tsum tau tig ib ncig ntawm lub axis ntawm symmetry, tsis muaj kev cuam tshuam lub zog ntawm daim ntawv cog lus thiab Lub kaum sab xis ntawm tus yuam sij thiab tus yuam sij (tus yuam sij) Raws li kev tshawb xav molecule orbits, ob lub atomic orbitals kaw tom qab tag nrho, los ntawm kev sib xyaw ua ke ntawm atomic orbitals, tsim ob m olecular orbitals Ntawm lawv, lub zog qis dua qhov qub atomic orbital molecular orbital yog hu ua kev sib koom ua ke orbital, lub zog siab dua qhov qub atomic orbital molecular orbital yog hu ua antibonding orbital Rau internuclear axis symmetric axis bonding orbital yog hu ua sigma orbital, Cov yuam sij sib xws hu ua sigma keyFor internuclear axis symmetric axis ntawm antibonding orbital hu ua sigma * orbit, tus yuam sij sib xws hu ua sigma * qhov tseem ceeb molecules nyob rau hauv lub xeev av, hluav taws xob feem ntau tsim cov tshuaj bonds nyob rau hauv lub tsev cog khoom orbital, thiab cia lub antibonding orbital khoob sigma daim ntawv cog lus yog Covalent daim ntawv cog lus Nws muaj cov yam ntxwv nram qab no: ua ntej ntawm tag nrho cov, sigma muaj kev taw qhia tseem ceeb, ob lub tsev cog khoom atoms yuav tsum nyob rau hauv lub axis ntawm symmetry mus kom ze, ua kom tiav ib tug loj sib tshooj; Thib ob, lub bonding electron huab yog symmetrically faib raws daim ntawv cog lus axis, thiab cov atoms ntawm ob qho kawg tuaj yeem hloov pauv raws li axis yam tsis muaj kev hloov pauv ntawm huab cua electron. density.Peb, σ bonds overlap head-to-head. Lawv sib tshooj ntau dua li lwm cov ntawv cog lus thiab muaj kev sib koom ua ke ntau dua. Yog li ntawd, chemically ruaj khov covalent ib daim ntawv cog lus yog σ daim ntawv cog lus, covalent ob daim ntawv cog lus muaj ib qho σ daim ntawv cog lus thiab π daim ntawv cog lus, thiab covalent triple bonds yog tsim los ntawm ib qho σ daim ntawv cog lus thiab ob daim ntawv cog lus π.
IKS PVD tuam txhab, kho kom zoo nkauj txheej tshuab, cuab yeej txheej tshuab, DLC txheej tshuab, kho qhov muag txheej tshuab, PVD nqus txheej kab, txoj haujlwm tig-key yog muaj. Hu rau peb tam sim no, E-mail:iks.pvd@foxmail.com