Cov tshuaj tiv thaiv-sintered silicon carbide muaj lub cev zoo

Vim nws lub cev zoo, cov tshuaj tiv thaiv-sintered silicon carbide tau dav siv los ua cov khoom siv tshuaj loj. Nws qhov kev thov muaj peb yam: rau kev tsim cov abrasives; Siv los tsim cov khoom cua sov tiv thaiv - silicon molybdenum pas nrig, silicon carbon tube, thiab lwm yam.; Rau kev tsim cov khoom siv refractory. Raws li cov khoom siv tshwj xeeb refractory, nws yog siv rau hauv cov hlau thiab hlau smelting li hlau moj tej tawg rauv, cupola thiab lwm yam stamping ua, corrosion, kev puas tsuaj rau lub zog ntawm cov khoom fireproof; Nyob rau hauv cov hlau tsis tshua muaj (zinc, aluminium, tooj liab) smelters rau melting rauv nqi, molten hlau conveyor yeeb nkab, lim ntaus ntawv, clamp pot, thiab lwm yam .; Thiab qhov chaw thev naus laus zis raws li lub tshuab hluav taws xob stamping tail nozzle, qhov kub thiab txias tsis tu ncua roj turbine hniav; Nyob rau hauv kev lag luam silicate, ntau li ntau yam kev lag luam kiln, lub thawv hom tsis kam rauv nqi, saggar; Hauv kev lag luam tshuaj, nws yog siv los ua cov khoom siv roj, roj av carburetor, flue gas desulfurization rauv thiab lwm yam.

Kev siv ntshiab ntawm α-SiC tsim cov khoom lag luam, vim tias nws lub zog loj, nws yog qhov nyuaj heev los zom nws mus rau hauv nanoscale ultrafined hmoov, thiab cov khoom yog cov phaj lossis fibers, siv los zom rau hauv lub compact, txawm nyob rau hauv cov cua kub kom nws decomposition. kub nyob ib ncig ntawm, yuav tsis tsim ib qho yooj yim folding, tsis tuaj yeem sintered, qib densification ntawm cov khoom yog tsawg, thiab oxidation kuj tsis zoo. Yog li ntawd, hauv kev tsim khoom ntawm cov khoom lag luam, me me ntawm cov khoom me me kheej kheej β-SiC ultrafine hmoov yog ntxiv rau α-SiC thiab xaiv cov khoom ntxiv kom tau txais cov khoom lag luam siab. Raws li ib qho ntxiv rau cov khoom sib txuas, raws li hom yuav muab faib ua hlau oxides, nitrogen tebchaw, siab purity graphite, xws li av nplaum, txhuas oxide, zircon, zirconium corundum, txiv qaub hmoov, laminated iav, silicon nitride, silicon oxynitride, siab. purity graphite thiab lwm yam. Cov tshuaj aqueous ntawm kev tsim cov nplaum tuaj yeem yog ib lossis ntau dua ntawm hydroxymethylcellulose, acrylic emulsion, lignocellulose, tapioca starch, aluminium oxide colloidal tov, silicon dioxide colloidal tov, thiab lwm yam. Raws li hom additives thiab qhov sib txawv ntawm qhov sib ntxiv, Qhov hluav taws kub kub ntawm lub compact tsis zoo ib yam, thiab qhov kub thiab txias yog 1400 ~ 2300 ℃. Piv txwv li, α-SiC70% nrog ib tug particle loj tis ntawm ntau tshaj 44μm, β-SiC20% nrog ib tug particle loj tis ntawm tsawg tshaj li 10μm, av nplaum 10%, ntxiv rau 4.5% lignocellulosic tov 8%, sib npaug sib xyaw, tsim nrog 50MPa ua hauj lwm. siab, raug rho tawm haujlwm hauv huab cua ntawm 1400 ℃ rau 4h, pom meej qhov ntom ntawm cov khoom yog 2.53g / cm3, qhov pom tseeb porosity yog 12.3%, thiab lub zog tensile yog 30-33mpa. Cov khoom sintering ntawm ntau hom khoom nrog cov khoom sib txawv yog teev nyob rau hauv Table 2.

Feem ntau, cov tshuaj tiv thaiv-sintered silicon carbide refractories muaj cov khoom zoo nyob rau hauv txhua yam, xws li muaj zog compressive zog, muaj zog thermal shock resistance, zoo hnav tsis kam, muaj zog thermal conductivity thiab hnyav corrosion kuj nyob rau hauv ntau qhov kub thiab txias. Txawm li cas los xij, nws yuav tsum tau pom tias nws qhov tsis zoo yog tias cov nyhuv antioxidant tsis zoo, uas ua rau lub ntim nthuav dav thiab deformation nyob rau hauv qhov kub thiab txias ib puag ncig kom txo tau lub neej kev pab cuam. Txhawm rau kom ntseeg tau tias oxidation tsis kam ntawm cov tshuaj tiv thaiv-sintered silicon carbide refractories, ntau txoj haujlwm xaiv tau ua tiav ntawm txheej txheej. Daim ntawv thov ntawm av nplaum (muaj hlau oxides) fusion, tab sis tsis muab cov nyhuv tsis zoo, silicon carbide hais tseem raug rau huab cua oxidation thiab corrosion.