Silicon Nitride Si3n4

Silicon nitride cov khoom tuaj yeem muab faib ua cov tshuaj tiv thaiv sintering khoom, cov khoom kub nias, atmospheric siab sintering khoom, isostatic pressing sintering khoom thiab cov tshuaj tiv thaiv hnyav sintering khoom raws li tus txheej txheem. Ntawm lawv, cov tshuaj tiv thaiv sintering yog ib txoj hauv kev siv los tsim cov khoom siv silicon nitride refractory.

Kev tsim cov khoom siv silicon nitride los ntawm cov tshuaj tiv thaiv sintering yog los tsim cov hmoov av silicon hmoov (particle loj feem ntau tsawg dua 80μm), molding los ntawm mechanical lossis isostatic nias, tom qab lub cev ntsuab qhuav, rhuab mus rau 1350 ~ 1400 degree hauv nitrogen, thiab nitrided tib lub sij hawm thaum lub sij hawm tua. Nrog rau txoj kev tsim khoom no, cov khoom siv raw khoom, cov txheej txheem tua hluav taws thiab cov huab cua muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm cov khoom.

Silica hmoov muaj ntau yam impurities, xws li Fe, Ca, Aì, Ti, thiab lwm yam. Fe yog suav tias yog ib qho catalyst hauv cov txheej txheem tshuaj tiv thaiv. Nws tuaj yeem txhawb nqa qhov sib txawv ntawm silicon, tab sis tib lub sijhawm, nws tseem yuav ua rau muaj qhov tsis xws luag xws li porosity. Lub luag haujlwm tseem ceeb ntawm Fe ua ib qho ntxiv: nws tuaj yeem siv los ua cov khoom siv hauv cov txheej txheem tshuaj tiv thaiv los txhawb kev tsim ntawm SiO2 oxide zaj duab xis rau ntawm qhov chaw ntawm cov khoom; Ib qho hlau-silicon yaj yog tsim, thiab nitrogen yog yaj hauv kua FeSi2, uas txhawb kev tsim ntawm -Si3N4. Txawm li cas los xij, yog tias cov khoom siv hlau loj dhau los yog cov ntsiab lus siab dhau lawm, cov teeb meem xws li porosity kuj yuav tshwm sim hauv cov khoom, uas yuav txo qhov kev ua tau zoo. Feem ntau, cov hlau ntxiv yog 0 ~ 5%. Cov impurities xws li Al, Ca, Ti thiab lwm yam impurities yog yooj yim los tsim eutectic nrog silicon. Qhov tsim nyog qhov sib ntxiv tuaj yeem txhawb nqa sintering thiab txhim kho kev ua haujlwm ntawm cov khoom.

Qhov loj dua qhov me me thiab qhov loj ntawm qhov chaw tshwj xeeb, qhov kub ntawm qhov hluav taws kub qis dua. Piv nrog rau cov coarser particle loj, tus nqi ntawm -Si3N4 nyob rau hauv cov khoom yog nce. Txo qhov me me ntawm silica fume tuaj yeem txo qhov microscopic pore loj ntawm cov khoom. Tsim nyog particle loj piv tuaj yeem txhim kho qhov ntom ntawm cov khoom.

Qhov kub thiab txias muaj qhov cuam tshuam rau tus nqi ntawm nitriding. Cov tshuaj tiv thaiv nitriding pib ntawm 970 ~ 1000 degree, thiab cov tshuaj tiv thaiv nrawm nrawm ntawm li 1250 degree. Nyob rau hauv lub siab kub theem, vim lub exothermic cov tshuaj tiv thaiv, yog hais tias qhov kub ceev tshaj lub melting point ntawm silicon (1420 degree), nws yog ib qho yooj yim mus ntws silicon, uas yuav ua rau lub silicon hmoov lub cev yaj thiab vau.

Thaum lub Plaub Hlis 2023, tus thawj coj ntawm lub koom haum rau Photonics ntawm Leibniz University, Michael M. Nrog kev pab los ntawm "hybrid technology", Kus pab neeg ua ke ib lub laser ua los ntawm indium phosphide, ib lim, thiab ib kab noj hniav ua los ntawm silicon nitride thiab kev koom ua ke. lawv mus rau ib tug chip. 

Nyob rau hauv 2023, ib pab neeg tshawb fawb los ntawm Engineering Ceramics Laboratory ntawm Kauslim lub koom haum ntawm cov ntaub ntawv tshawb fawb tau fabricated silicon nitride bearing npas rau fais tsheb tsav modules.Lub ntiaj teb no kev lag luam loj ntawm hybrid bearings siv silicon nitride pob tshuab yuav tsum loj hlob mus rau ntau tshaj 1.3 trillion yeej los ntawm 2026.