Daim ntawv thov ntawm Silicon Nitride hauv Refractory Kev Lag Luam

Kev siv ntawm silicon nitride hauv kev lag luam refractory
Silicon nitride ceramics raug suav hais tias yog kev cog lus siab - cov ntaub ntawv kub ntawm cov khoom siv vim lawv cov khoom zoo heev - kub, xws li lub zog siab, hnav tsis kam, thiab corrosion kuj. Qhov muaj zog covalent bonds thiab qis diffusion coefficient ntawm qhov kub thiab txias yuav tsum tau siv qhov kub thiab txias siab, nrog rau cov sintering agents, rau kev tsim cov silicon nitride ceramics. Cov nqi tsim khoom thiab kev txwv cov cuab yeej siv no nyuaj rau kev lag luam metallurgical lees txais, uas yog vim li cas kev tshawb fawb hauv cov ntaub ntawv refractory pib lig thiab tsis nyob rau hauv - qhov tob. Ntau qhov kev xav tau muab los ntawm ceramics tsis muaj kev hloov pauv ntau. Tam sim no, silicon nitride muaj nyob rau hauv cov ntaub ntawv refractory raws li lub sij hawm sib txuas, uas ua ke cov ntaub ntawv raw xws li corundum lossis silicon carbide los ntawm nitridation sintering ntawm cov hlau, yog li ua tiav lub hom phiaj ntawm kev sib txuas cov ntaub ntawv refractory ua ke. Piv txwv li, silicon nitride bonded silicon carbide cov ntaub ntawv siv nyob rau hauv txhuas electrolytic hlwb siv Si3N4 generated los ntawm nitridation raws li lub sij hawm sib cog lus, thiab Si3N4 feem ntau nkag mus rau hauv cov ntaub ntawv refractory nyob rau hauv hmoov daim ntawv.
(1) Siv rau hauv cov khoom siv hlau refractory
Nyob rau hauv xyoo tas los no, kev nce qib tseem ceeb tau ua rau hauv corundum-silicon carbide-silicon nitride- cov khoom siv carbon siv nyob rau hauv qhov cub tawg loj. Cov khoom siv refractory ua los ntawm silicon nitride, silicon oxynitride, los yog sialon-bonded silicon carbide tau dav siv nyob rau hauv nruab nrab seem ntawm loj blast furnaces thiab load- bearing qhov chaw ntawm coke cub. Tsis tas li ntawd, corundum-silicon carbide-silicon nitride- cov khoom siv roj carbon refractory tau siv ntau dua hauv cov tsheb torpedo, ua kom pom kev yaig zoo heev, hnav tsis kam, thiab kev tiv thaiv scouring. Qhov no tau zoo heev txhim kho lub neej kev pab cuam ntawm lub refractory hauv ob sab phlu hauv torpedo tsheb.
Tam sim no, kwv yees li 61% ntawm qhov cub tawg rau txawv teb chaws tau txais cov khoom siv refractory uas muaj Si3N4, tshwj xeeb tshaj yog rau cov tshuab hluav taws xob loj loj nrog lub taub hau ntawm 12-15mm, qhov twg nws tus nqi saws tau mus txog 68%. Raws li kev txheeb cais, dhau 10 xyoo dhau los, ntau dua 3,500 tons ntawm cov khoom zoo li no tau raug teeb tsa hauv 127 qhov cub tawg. Feem ntau ntawm qhov cub tawg siv 270-800 tons txhua, nrog rau kev siv xws li tuyeres, bosh, duav mus rau nruab nrab thiab qis ntawm pawg. Silicon nitride bonded khoom yog tsuas yog txhawb rau siv nyob rau hauv nruab nrab seem ntawm blast furnaces. Furukawa Steel Cog ntawm Kobe Steel hauv Nyij Pooj tau sim los ntawm kev ntxiv me me ntawm cov ntshiab -Si3N4 rau AI2O3-SiC-C cib ntawm lub tsheb tov khoom. Qhov kev sim tau pom tias nws cov slag tsis kam thiab oxidation kuj tau txhim kho tau zoo.
(2) Kev siv hauv steelmaking cov ntaub ntawv refractory
Nyob rau hauv xyoo tas los no, silicon nitride tau ua tiav rau cov ntaub ntawv swb rau hauv qab ntawm steel ladles ob leeg hauv tsev thiab txawv teb chaws. Qhov sib ntxiv ntawm cov ntaub ntawv silicon nitride rau lub phaj swb tau txhim kho nws cov hnav tsis kam, yaig tsis kam, thiab kev pabcuam lub neej, txo tus nqi ib tuj ntawm cov hlau hauv ladle refining;
(3) Siv rau hauv cov ntaub ntawv refractory rau smelting non-ferrous hlau xws li txhuas, tooj liab, thiab zinc
Silicon nitride ceramics tsis ntub nrog cov ntsiab lus hlau ntawm qhov kub thiab txias, ua rau lawv haum rau kev siv siab -cov khoom kub hauv cov txheej txheem uas tsis yog -ferrous hlau smelting, xws li ntsuas kub ntsuas thermocouple casings, smelting furnace linings, ntau lub thawv linings, thiab crucibles. Silicon nitride ceramic cov khoom muaj qhov zoo thermal shock tsis kam thiab tuaj yeem siv tau rau lub sijhawm ntev ntawm qhov kub thiab txias los yog siab - kub mus rau qis - qhov kub thiab txias.
(4) Siv rau hauv cov khoom stifling
Ceramic shed boards yog silicon nitride-cov ntaub ntawv sib koom ua ke silicon carbide npaj los ntawm kev ua haujlwm thiab sintering silicon carbide hais thiab nplua silicon hmoov nyob rau hauv qhov siab - qhov kub thiab txias nitrogen, ua kom cov khoom ua tau zoo. Piv rau av nplaum-bonded silicon carbide shed boards, cov ntaub ntawv no tau zoo heev txhim kho siab -kub kev ua tau zoo thiab hais txog qhov teeb meem ntawm shed board expansion thiab puas los ntawm oxidation ntawm silicon carbide thaum siv.