Molybdenum Silicide, MoSi2

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Molybdenum Silicide, MoSi2

Molybdenum disilicide (Molybdenumdisilicide, MoSi2) yog ib hom ntawm silicon molybdenum tebchaw, vim tias ob lub atomic hluav taws xob tau zoo sib xws, electronegativity nyob ze rau, yog li nws yog qhov zoo sib xws ntawm cov hlau thiab ceramic.


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>> Cov ntaub ntawv muaj feem xyuam

Molybdenum disilicide (Molybdenumdisilicide, MoSi2) yog ib hom ntawm silicon molybdenum tebchaw, vim hais tias ob lub atomic hluav taws xob tau zoo sib xws, electronegativity ze rau, yog li nws yog qhov zoo sib xws ntawm cov hlau thiab ceramic.With lub ntsiab lus mus txog 2030 ℃ thiab hluav taws xob conductivity, silicon dioxide passivating txheej tuaj yeem tsim nyob rau saum npoo ntawm qhov kub kom tiv thaiv tau ntxiv oxidation. Nws cov tsos yog grey hlau xim, muab tau los ntawm nws cov quadric-txoj kev siv lead ua qauv, thiab tseem muaj hexagonal tab sis tsis ruaj khov-hloov kho qauv siv lead ua.Insoluble hauv feem ntau cov kua qaub, tab sis soluble hauv nitric acid thiab hydrofluoric acid.
MoSi2 yog ib hom mesophase nrog lub siab tshaj plaws ntawm silicon cov ntsiab lus nyob rau hauv mo-SI binary alloy system.Nws yog ib hom kub cov khoom siv nrog kev ua tau zoo tshaj plaws.Hauv qhov kub siab oxidation tsis kam, oxidation tsis kam kub txog 1600 ℃, sib npaug rau SiC; Ntsuas ntom ntom nti (6.24g / cm3); Tsawg dua cov cua sov nthuav dav (8.1 × 10-6K-1); Lub tshuab hluav taws xob zoo; Lub siab tawg yooj yim hluav taws xob kub hloov (1000 ℃) hauv qab cov ceramic - zoo li nyuaj brittleness.At 1000 ℃ saum cov hlau zoo li mos yas.MoSi feem ntau yog siv los ua cua kub keeb, kev sib xyaw ua ke, kub kub tiv thaiv oxidation txheej thiab kub txheej txheem txheej txheem.Hauv MoSi2, molybdenum thiab silicon yog sib khi los ntawm cov ntawv hlau, silicon thiab silicon yog sib khi los ntawm covalent bonds, thiab molybdenum disilicide. yog grey quadripartite siv lead ua.Insoluble nyob rau hauv cov ntxhia roj ntsha feem ntau (suav nrog aqua aqua), tab sis soluble hauv kev sib xyaw ntawm nitric acid thiab hydrofluoric acid, nws muaj qhov kub zoo antioxidant muaj peev xwm thiab tuaj yeem siv raws li qhov kub thiab txias ((LT; Cov cua kub ua haujlwm) ua haujlwm hauv qhov chaw oxidizing ntawm 1700 ℃ .Nyob hauv oxidizing cov cua, ib txheej tiv thaiv tau tsim nyob rau saum npoo ntawm ntom iav silica iav (SiO2) kub ntawm qhov kub kom tiv thaiv qhov ua kom tsis tu ncua oxidation ntawm molybdenum disilicate.Thaum qhov kub ntawm lub caij cua sov yog siab dua 1700 ℃, SiO2 tiv thaiv zaj duab xis yog tsim, uas yog tuab ntawm 1710 ℃ thiab fused nrog
SiO2 rau hauv molten dauv.Ua rau cov kev txav ntawm nws qhov chaw txuas ntxiv, nws poob nws lub peev xwm tiv thaiv.Ua kev txiav txim ntawm oxidant, thaum lub caij txuas ntxiv siv, nws tsim cov yeeb yaj kiab tiv thaiv dua.Nws yuav tsum nco ntsoov tias vim muaj zog oxidation ntawm tsis tshua muaj qhov kub thiab txias, lub khoom tsis tuaj yeem siv tau ntev ntev ntawm 400-700 ℃ .Molybdenum kev ua haujlwm tsis zoo yog siv rau hauv cov teb ntawm cov khoom siv tiv thaiv kub siab tiv thaiv kev kub ntxhov, hluav taws xob cua kub, cov khoom siv hluav taws xob, cov yeeb yaj kiab qauv, kev txhawb zog ntawm cov khoom sib txuas, hnav cov ntaub ntawv tsis kam, cov ntaub ntawv sib txuas ntawm cov qauv thawb txheej txheem, thiab lwm yam Nws tau faib rau hauv txoj kev lag luam hauv qab no:

1) Lub zog hluav taws xob kev lag luam: cov khoom siv hluav taws xob cua sov, cov cua kub hloov pauv rau cov atomic reactor installations, roj hlawv, lub ntsuas kub ntawm lub nruab nrog cua sov thiab lawv cov tub tiv thaiv, crucible rau melting tais diav (siv rau melting sodium, lithium, txhuas, bismuth, tin thiab lwm yam hlau) )).

2) Kev lag luam microelectronics: MoSi2 thiab lwm cov hlau refractory silicides Ti5Si3, WSi2 thiab TaSi2 yog cov neeg sib tw tseem ceeb rau GATE thiab kev sib tshuam cov yeeb yaj kiab nyias ntawm LSI.

3) Aerospace kev lag luam: dav thiab tob tshawb nrhiav thiab siv raws li kub kub antioxidant txheej khoom.Qhov tshwj xeeb raws li lub cav ntuag lub cav, xws li hniav, impeller, hlawv kub hnyiab, nozzle thiab sealing ntaus cov khoom siv.Molybdenum disilicide tau dhau los ua qhov tseeb hotspot hauv kev tshawb fawb ntawm intermetallic compound cov qauv txheej txheem raws li cov qauv siv hauv cov khoom kub hauv qhov kub, cov roj hlawv, nozzles, lub siab lim dej thiab lub txim hluav taws xob rau aviation thiab tsheb roj turbines.Qhov teeb meem loj tshaj plaws rau daim ntawv thov no yog nws loj brittleness ntawm chav tsev kub thiab tsis muaj zog ntawm kub .Yog li ntawd, qhov ntsuas kub tsis tshua muaj siab thiab muaj qhov kub thiab txias siab ntawm molybdenum disilicate yog cov thev naus laus zis tseem ceeb rau nws daim ntawv thov raws li cov qauv txheej txheem.Qhov kev tshwm sim qhia tau tias alloying thiab compounding yog cov txiaj ntsig zoo los txhim kho qhov nyuaj thiab siab kub lub zog ntawm molybdenum disilicate ntawm chav tsev kub. Cov khoom siv feem ntau siv hauv moly bdenum disilicide alloying tsuas yog ob peb silicides uas muaj qhov zoo tib yam lossis siv lead ua kev sib tshuam nrog molybdenum disilicide, xws li WSi2, NbSi2, CoSi2, Mo5Si3 thiab Ti5Si3, uas WSi2 yog qhov zoo tshaj plaws.Hauv txhua yam, qhov zoo ntawm molybdenum cuam tshuam hauv WSi2 tau pom tseeb ploj, thiab daim ntawv thov tau tsawg .Nws tau ua pov thawj tias molybdenum disilicide muaj cov tshuaj lom neeg ruaj khov thiab muaj lub zog zoo nrog yuav luag txhua cov chaw ua kom zoo nkauj (xws li SiC, TiC, ZrO2, Al2O3, TiB2, thiab lwm yam).
Yog li no, txoj hauv kev zoo tshaj txhawm rau txhim kho cov neeg kho tshuab thaj chaw ntawm molybdenum disilicate yog los npaj molybdenum disilicate composite.


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