Ferrosilicon Nitride (FeSi₃N₄)
Tshuaj muaj pes tsawg leeg: Ua los ntawm siab -kub nitridation ntawmferro silicon alloy(feem ntau muaj65%-75%Si) nyob rau hauv ib qho chaw nitrogen. Cov theem tseem ceeb yog Si₃N₄ (xws li 70% -85%), nrog me me ntawm Fe dawb (10% -15%) thiab silicon unreacted.
Daim ntawv lub cev: Greyish-dawb mus rau tsaus grey hmoov los yog granules, nrog ib tug ceev ntawm kwv yees li 3.2-3.4g / cm³ thiab ib tug hardness ntawm HV 1400-1800.
Crystal Structure: Dominated los ntawm -Si₃N₄ nrog me me theem. Hlau ntsiab yog dispersed nyob rau hauv lub matrix nyob rau hauv daim ntawv ntawm zoo hais.
Silicon Nitride (Si₃N₄)
Tshuaj muaj pes tsawg leeg: Ib qho ntshiab -theem ceramic khoom nrog atomic piv ntawm Si: N yog 3: 4 thiab theoretical ntom ntawm 3.18g / cm³.
Daim ntawv lub cev: Dawb los yog lub teeb grey hmoov, uas tsim ib tug heev ntom ceramic lub cev tom qab sintering, nrog ib tug hardness ntawm HV 1800-2200 (rau sintered lub cev).
Crystal Structure: Feem ntau muaj nyob rau hauv ob daim ntawv: theem (tsawg- kub ruaj khov hom) thiab theem (siab- kub ruaj khov hom). Cov khoom lag luam kho qhov kev faib ua feem ntawm ob theem los ntawm kev tswj cov txheej txheem sintering.
Kev sib piv ntawm Cov Khoom Tseem Ceeb
| Sib piv Dimension | Ferrosilicon Nitride, FeSi₃N₄ | Silicon Nitride, Si₃N₄ | Core Impact |
|---|---|---|---|
| Core Components thiab Purity | Si 65% -75%, N 18% -22%, Fe 10% -15%, composite theem qauv | Si₃N₄ purity Ntau dua lossis sib npaug li 99% (qib kev lag luam), Ntau dua lossis sib npaug rau 99.9% (siab- qib kawg), qib ntshiab ceramic | Purity txiav txim siab lub siab ntawm kev ua haujlwm; silicon nitride hlau sib npaug kev ua haujlwm thiab tus nqi, thaum silicon nitride tsom rau qhov ua tau zoo kawg. |
| Cov khoom tseem ceeb ntawm lub cev | Thermal conductivity 15-30 W / (m・K), flexural zog 300-600 MPa, hardness HV 1400-1800 | Thermal conductivity 40-170 W / (m・K) (theem mus txog 200), flexural zog 700-1500 MPa, hardness HV 1800-2200 | Silicon nitride outperforms silicon nitride hlau nyob rau hauv txhua yam, tshwj xeeb tshaj yog nyob rau hauv kub kub thiab txhua yam muaj zog. |
| Tshuaj Stability | Oxidation ntawm 1300-1400℃ua rau SiO₂ tiv thaiv zaj duab xis, tiv taus acid thiab alkali corrosion (tshwj tsis yog muaj zog oxidants) | Ruaj khov ntawm 1600-1700 degree, tiv taus corrosion los ntawm cov tshuaj lom neeg feem ntau, cov qauv ntshiab theem tsis muaj impurity nag lossis daus | Silicon nitride yog qhov tsim nyog rau qhov kub thiab txias dua thiab qhov hnyav dua corrosion. |
| Kev nyuaj ntawm kev tsim khoom | High -kub nitriding ntawm ferrosilicon (1350-1450 degree, 8-12 teev), cov txheej txheem paub tab. | Cov tshuaj tiv thaiv sintering / kub nias sintering (1700-1850 degree, xav tau sintering pab), txheej txheem nyuaj | Silicon nitride hlau muaj peev xwm ntau lawm (1.5 lab tons / xyoo thoob ntiaj teb, nrog Tuam Tshoj suav txog 65%), ua kom muaj kev ruaj ntseg siab. |
Qhov txawv ntawm Cov Txheej Txheem Npaj
Kev npaj ntawmFerrosilicon Nitride
Lub peev xwm tsim tau thoob ntiaj teb: kwv yees li 1.5 lab tons / xyoo, nrogTuam Tshoj suav txog 65%.
Kev npaj raw khoom:
Xaiv ferrosilicon alloy (65% -75% Si) thiab zuaj nws kom tsawg dua 1 hli.
Nitridation Reaction:
Introduce high-purity nitrogen (>99.99%) mus rau hauv lub qhov hluav taws xob ntsug, cua sov mus rau 1350-1450 degree, thiab hnov mob rau 8-12 teev los tsim cov theem sib xyaw uas cov hlau tau qhwv hauv Si₃N₄.
Tom qab -kev kho mob:
Tom qab txias, zuaj thiab tshuaj ntsuam cov khoom, thiab tshem tawm cov hlau dawb los ntawm kev sib nqus sib nqus los tswj cov ntsiab lus Fe hauv 10% -15%.
Kev npaj ntawmSilicon Nitride
Reaction Sintering Method:
Nias silicon hmoov rau hauv ib lub compact, uas ces reacts nyob rau hauv nitrogen ntawm 1350-1450℃rau synthesize -Si₃N₄. Secondary sintering yog yuav tsum tau rau densification.
Txoj kev kub nias Sintering:
Ntxiv sintering pab xws li MgO thiab Y₂O₃, thiab sinter ntawm 1700-1850℃nyob rau hauv ib tug siab ntawm 20-30MPa kom tau high-density -Si₃N₄.
Gas Pressure Sintering Txoj Kev:
Sinter in high-pressure nitrogen (>1MPa) txhawm rau inhibit qhov decomposition ntawm Si₃N₄ thiab ua kom muaj siab -purity ceramic Cheebtsam.
Kev sib piv ntawm Core Application Fields
Kev siv ntawm Ferrosilicon Nitride
Refractories:
Siv nyob rau hauv taphole av nplaum ntawm loj blast furnaces (xws li, Baosteel's 4966m³ moj tej tawg rauv) los txhim kho erosion kuj thiab thermal shock stability, txo qhov fluctuation ntawm taphole qhov tob los ntawm 30%.
Hlau thiab hlau metallurgy:
Ua haujlwm hloov rau ib feem ntawm FeSi thiab FeN ua cov deoxidizer, txo cov nqi hlau los ntawm 15% -20% hauv kev tsim cov HRB400 rebars.
Hnav-Cov coatings tiv taus:
Thermal sprayed FeSi₃N₄ coatings yog siv rau mining machinery, nrog ib tug hnav tus nqi 50% qis dua cov tsoos carbon hlau.
Kev siv ntawm Silicon Nitride
Siab -Tsuas Cov Qauv Qhov Chaw:
Siv hauv aero- cav turbine hniav (GE9X cav txais Si₃N₄ ceramic bearings), uas tuaj yeem tiv taus qhov kub ntawm 1300℃thiab txo qhov hnyav los ntawm 30%.
Electronic Field:
Silicon nitride substrates rau 5G hauv paus chaw nres tsheb muaj cov thermal conductivity ntawm 170W / (m·K), nrog rau cov cua sov dissipation efficiency ob zaug ntawm Al₂O₃.
Cov cuab yeej txiav:
Si₃N₄-raws li cov cuab yeej ceramic rau kev ua cov nickel{1}}raws li alloys tuaj yeem ua tiav qhov ceev ntawm 300m / min, nrog rau kev pab cuam lub neej 5 npaug ntawm cemented carbide.
Kev Taw Qhia Kev Xaiv thiab Kev Pom Zoo Kev Lag Luam
Cov txheej txheem xaiv cov khoom siv
Rau qis -cov nqi deoxidation lossis cov khoom siv refractory, ferrosilicon nitride yog nyiam (nws tus nqi tsuas yog 1/5-1/10 ntawm silicon nitride).
Rau cov ntawv thov uas yuav tsum tau ua kom siab - kub lub zog los yog kev ua haujlwm rwb thaiv tsev, silicon nitride yuav tsum tau siv (xws li hauv cov ntim khoom semiconductor thiab siab -kub bearings).
Kev lag luam Trends
Ferrosilicon Nitride:
Kev tsim kho mus rau qis silicon (60% Si) thiab siab nitrogen (N 20% +) kom tau raws li qhov yuav tsum tau ua ntawm ultra- carbon steel tsawg.
Silicon Nitride:
Cov thermal conductivity tau raug txhim kho mus rau ntau dua 200W / (m·K) los ntawm nanocrystalline thev naus laus zis (xws li nano -Si₃N₄ tsim los ntawm Shanghai Institute of Ceramics, Suav Academy of Sciences).
