Unveiling cov khoom tshwj xeeb thiab daim ntawv thov kev cia siab ntawm ntsuab silicon carbide micropowder
Nyob rau niaj hnub no cov ntaub ntawv high-tech teb, ntsuab silicon carbide micropowder yog maj mam ua lub hom phiaj ntawm cov xim nyob rau hauv cov ntaub ntawv science zej zog nrog nws cov cim lub cev thiab tshuaj. Qhov sib xyaw ua ke ntawm cov pa roj carbon thiab silicon cov ntsiab lus tau pom dav daim ntawv thov kev cia siab nyob rau hauv ntau qhov chaw lag luam vim nws cov qauv siv lead ua tshwj xeeb thiab kev ua haujlwm zoo heev. Tsab ntawv xov xwm no yuav tshawb txog qhov tob ntawm cov khoom tshwj xeeb ntawm ntsuab silicon carbide micropowder thiab nws cov peev txheej hauv ntau qhov chaw.
1. Cov yam ntxwv tseem ceeb ntawm ntsuab silicon carbide micropowder
Ntsuab silicon carbide (SiC) yog cov khoom siv hluavtaws superhard thiab belongs rau covalent bond compound. Nws cov qauv siv lead ua nthuav qhia cov txheej txheem hexagonal nrog lub pob zeb zoo li kev teeb tsa. Ntsuab silicon carbide micropowder feem ntau yog hais txog cov khoom siv hmoov nrog cov khoom me me ntawm 0.1-100 microns, thiab nws cov xim nthuav tawm ntau lub suab los ntawm lub teeb ntsuab mus rau ntsuab tsaus vim txawv purity thiab impurity cov ntsiab lus.
Los ntawm cov qauv microscopic, txhua silicon atom nyob rau hauv ntsuab silicon carbide siv lead ua ua ib tug tetrahedral kev koom tes nrog plaub carbon atoms. Qhov no muaj zog covalent daim ntawv cog lus qauv muab cov khoom tsis tshua muaj siab hardness thiab tshuaj stability. Nws yog tsim nyog sau cia tias Mohs hardness ntawm ntsuab silicon carbide ncav cuag 9.2-9.3, thib ob tsuas yog pob zeb diamond thiab cubic boron nitride, uas ua rau nws irreplaceable nyob rau hauv lub teb ntawm abrasives.
2. Cov khoom tshwj xeeb ntawm ntsuab silicon carbide micropowder
1. Cov khoom siv kho tshuab zoo heev
Qhov tseem ceeb tshaj plaws ntawm ntsuab silicon carbide micropowder yog nws cov hardness siab heev. Nws Vickers hardness tuaj yeem ncav cuag 2800-3300kg / mm², uas ua rau nws ua tau zoo thaum ua cov ntaub ntawv nyuaj. Nyob rau tib lub sijhawm, ntsuab silicon carbide kuj muaj lub zog zoo compressive thiab tseem tuaj yeem tuav lub zog txhua yam ntawm qhov kub thiab txias. Qhov no feature ua rau nws muaj peev xwm siv nws nyob rau hauv huab ib puag ncig.
2. Cov khoom siv thermal zoo heev
Lub thermal conductivity ntawm ntsuab silicon carbide yog siab li 120-200W / (m·K), uas yog 3-5 npaug ntawm cov hlau zoo tib yam. Qhov zoo tshaj plaws thermal conductivity ua rau nws yog ib qho zoo tagnrho tshav kub dissipation khoom. Dab tsi yog qhov zoo tshaj plaws yog tias cov thermal expansion coefficient ntawm ntsuab silicon carbide tsuas yog 4.0 × 10⁻⁶ / ℃, uas txhais tau hais tias nws muaj qhov ruaj khov zoo heev thaum qhov kub thiab txias hloov, thiab yuav tsis tsim kom pom tseeb deformation vim thermal expansion thiab contraction.
3. Muaj tshuaj lom neeg ruaj khov
Nyob rau hauv cov nqe lus ntawm cov khoom siv tshuaj, ntsuab silicon carbide exhibits tsis tshua muaj zog inertness. Nws tuaj yeem tiv thaiv corrosion ntawm feem ntau cov kua qaub, alkalis thiab ntsev daws, thiab tuaj yeem nyob ruaj khov txawm tias nyob rau qhov kub thiab txias. Kev sim qhia tias ntsuab silicon carbide tseem tuaj yeem ua kom muaj kev ruaj ntseg zoo hauv qhov chaw oxidizing hauv qab 1000 ℃, uas ua rau nws muaj peev xwm siv tau ntev hauv qhov chaw corrosive.
4. Cov khoom siv hluav taws xob tshwj xeeb
Ntsuab silicon carbide yog ib tug dav bandgap semiconductor khoom nrog ib tug bandgap dav ntawm 3.0eV, uas yog ntau npaum li cas loj tshaj li 1.1eV ntawm silicon. Cov yam ntxwv no ua rau nws tuaj yeem tiv taus qhov kub thiab txias dua, thiab muaj qhov tshwj xeeb zoo hauv cov khoom siv hluav taws xob hluav taws xob. Tsis tas li ntawd, ntsuab silicon carbide kuj muaj lub zog hluav taws xob siab, uas ua rau nws muaj peev xwm tsim cov khoom siv ntau zaus.
3. Kev npaj txheej txheem ntawm ntsuab silicon carbide micropowder
Kev npaj ntawm ntsuab silicon carbide micropowder tsuas yog siv cov txheej txheem Acheson. Txoj kev no sib tov quartz xuab zeb thiab roj av coke nyob rau hauv ib qho kev faib ua feem thiab heats lawv mus rau 2000-2500 ℃ nyob rau hauv lub qhov cub tsis kam rau cov tshuaj tiv thaiv. Lub blocky ntsuab silicon carbide generated los ntawm cov tshuaj tiv thaiv undergoes txheej txheem xws li crushing, grading, thiab pickling thaum kawg tau txais micropowder khoom ntawm txawv particle loj.
Nyob rau hauv xyoo tas los no, nrog kev nce qib ntawm thev naus laus zis, qee qhov kev npaj tshiab tau tshwm sim. Tshuaj vapor deposition (CVD) tuaj yeem npaj siab purity nano-scale ntsuab silicon carbide hmoov; txoj kev sol-gel tuaj yeem tswj tau qhov loj me thiab morphology ntawm cov hmoov; plasma txoj kev tuaj yeem ua tiav kev tsim khoom tas mus li thiab txhim kho kev tsim khoom. Cov txheej txheem tshiab no muab ntau txoj hauv kev rau kev ua kom zoo dua qub thiab daim ntawv thov nthuav dav ntawm ntsuab silicon carbide micropowder.
4. Lub ntsiab daim ntawv thov thaj chaw ntawm ntsuab silicon carbide micropowder
1. Precision sib tsoo thiab polishing
Raws li ib tug superhard abrasive, ntsuab silicon carbide micropowder yog dav siv nyob rau hauv precision processing ntawm cemented carbide, ceramics, iav thiab lwm yam ntaub ntawv. Hauv kev lag luam semiconductor, high-purity ntsuab silicon carbide hmoov yog siv rau polishing silicon wafers, thiab nws cov kev ua tau zoo yog zoo dua li cov tsoos alumina abrasives. Hauv kev ua cov khoom siv kho qhov muag, ntsuab silicon carbide hmoov tuaj yeem ua tiav nano-scale deg roughness thiab ua tau raws li qhov yuav tsum tau ua ntawm high-precision optical Cheebtsam.
2. Cov khoom siv ceramic zoo heev
Ntsuab silicon carbide hmoov yog ib qho tseem ceeb raw khoom rau kev npaj ntawm high-kev ua tau zoo ceramics. Cov txheej txheem ceramics nrog cov khoom siv zoo heev thiab thermal stability tuaj yeem ua los ntawm kub nias sintering lossis cov txheej txheem sintering. Cov khoom siv ceramic no yog siv dav hauv cov khoom tseem ceeb xws li cov khoom siv foob, cov kabmob, thiab cov nozzles, tshwj xeeb tshaj yog nyob rau hauv kev ua haujlwm hnyav xws li kub thiab corrosion.
3. Cov khoom siv hluav taws xob thiab cov khoom siv semiconductor
Hauv kev lag luam hauv hluav taws xob, ntsuab silicon carbide hmoov yog siv los npaj cov khoom siv semiconductor dav bandgap. Cov khoom siv hluav taws xob raws li ntsuab silicon carbide muaj cov zaus, high-voltage, thiab high-temperature ua hauj lwm yam ntxwv, thiab qhia tau hais tias muaj peev xwm loj nyob rau hauv lub zog tshiab tsheb, ntse daim phiaj thiab lwm yam teb. Cov kev tshawb fawb tau pom tias ntsuab silicon carbide fais fab khoom siv tuaj yeem txo lub zog poob ntau dua 50% piv nrog cov khoom siv silicon-based.
4. Composite reinforcement
Ntxiv ntsuab silicon carbide hmoov raws li ib theem ntxiv rau cov hlau lossis polymer matrix tuaj yeem txhim kho lub zog, hardness thiab hnav tsis kam ntawm cov khoom sib xyaw. Nyob rau hauv aerospace teb, aluminium-raws li silicon carbide composites yog siv los tsim lub teeb yuag thiab high-strength structural qhov chaw; nyob rau hauv kev lag luam tsheb, silicon carbide reinforced brake pads qhia tau hais tias zoo heev kub-resistant.
5. Cov khoom siv refractory thiab coatings
Siv qhov kub-kub ruaj khov ntawm ntsuab silicon carbide, cov khoom siv refractory siab tuaj yeem npaj tau. Hauv kev lag luam steel smelting, silicon carbide refractory cib yog siv dav hauv cov khoom siv kub kub xws li blast furnaces thiab converters. Tsis tas li ntawd, silicon carbide txheej tuaj yeem muab kev hnav zoo heev thiab kev tiv thaiv corrosion rau cov khoom siv hauv paus, thiab siv rau hauv cov khoom siv tshuaj, turbine hniav thiab lwm yam.