Refractory raw cov ntaub ntawv yog lub hauv paus ntawm refractories, txawm hais tias technology nce qib. Cov khoom evolution kuj ncaj qha cuam tshuam rau refractory zoo. Kev txhawb nqa yog qhov tseem ceeb rau kev txhim kho tag nrho cov ntaub ntawv refractory tshiab rau cov cement kiln.
Piv txwv li, xws li magnesia-alumina spinel, hlau-aluminium spinel, thiab magnesia-hlau spinel yog tag nrho inseparable ntawm magnesia-aluminium spinel, hlau-aluminium spinel, thiab magnesia-hlau spinel cib. Raws li lwm qhov piv txwv, zircon, silicon carbide, andalusite, thiab kyanite yog inseparable los ntawm tshwj xeeb high-alumina cib xws li anti-stripping cib thiab silica cib. Tsis tas li ntawd, xyaum ua txhua yam khoom siv high-qib monolithic refractory tsis tuaj yeem sib cais los ntawm ib leeg.
1, Spinel ua los ntawm magnesium thiab txhuas
Lub refractory raw khoom nrog lub siab melting point, tsis tshua muaj thermal expansion coefficient, tsis tshua muaj thermal conductivity, zoo thermal shock stability, thiab muaj zog corrosion kuj yog magnesium-aluminium spinel. Nws tuaj yeem muab faib ua sintered magnesia-aluminium spinel thiab fused magnesia-alumina spinel raws li ntau yam kev sib txuas.
Magnesium-aluminium spinel muaj zog thermal shock stability, corrosion kuj, thiab abrasion kuj. Nws ob txoj kev siv tseem ceeb tshaj plaws yog: thawj zaug, kev hloov ntawm magnesia-chrome xuab zeb hauv kev tsim cov magnesia-aluminium spinel cib rau cov cement rotary kilns, uas tsis tsuas yog tiv thaiv chromium muaj kuab paug, tab sis kuj muaj kev tiv thaiv zoo; thiab qhov thib ob, kev tsim cov ladle castables, uas ua rau muaj kev txhim kho steel hauv ob sab phlu corrosion kuj. Nws yog dav siv nyob rau hauv steelmaking cov ntaub ntawv refractory. Lub creation ntawm premium pre-synthesized spinel muaj cov ntaub ntawv tshiab.
2. Silicon carbide
Silicon carbide yog dav siv nyob rau hauv abrasives, cua sov ntsiab, cov ntaub ntawv refractory thiab structural ceramics vim nws siab hardness, hluav taws xob conductivity, kub tsis kam thiab siab zog. Cov khoom lag luam muaj silicon carbide muab faib ua xim dub thiab ntsuab. Dub silicon carbide feem ntau yog siv rau hauv cov khoom siv raw khoom.
Silicon carbide muaj qhov kub thiab txias tsis kam. Nyob rau hauv ib txwm muaj siab, qhov kub tsis sib xws ntawm silicon carbide yog 2760 degree, silicon carbide muaj lub zog siab, thiab lub zog flexural tuaj yeem ncav cuag 625MPa. Silicon carbide muaj cov thermal poob siab zoo, ua tsaug rau nws cov thermal expansion coefficient nruab nrab (4.7 × 10-6K-1) thiab siab thermal conductivity [84W / (m·K)]. Yog li ntawd, silicon carbide yog dav siv los ua ntau yam ceramics thiab refractory raw khoom.
3, Zircon
Zircon xuab zeb muaj thermal expansion, siab thermal conductivity, thiab muaj zog tshuaj stability, thiab yog tsuas yog siv nyob rau hauv zus tau tej cov refractory raw cov ntaub ntawv: zirconium refractory cov ntaub ntawv, xws li zirconium corundum bricks, zirconium refractory fibers.
Nws tuaj yeem siv los ua zircon cib rau iav kilns, zircon cib rau steel nruas, ramming cov ntaub ntawv thiab castables; nws tuaj yeem muab ntxiv rau lwm cov ntaub ntawv los txhim kho nws cov kev ua tau zoo, xws li ntxiv zircon xuab zeb rau hluavtaws cordierite, uas tuaj yeem nthuav dav cordierite Lub sintering ntau yam tsis cuam tshuam rau nws cov thermal shock stability; zircon xuab zeb yog ntxiv rau siab alumina cib los tsim kev tiv thaiv siab alumina cib, thiab thermal shock stability zoo heev; Nws tseem tuaj yeem siv los rho tawm ZrO2.
