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

Vim nws cov khoom zoo, cov silicon carbide reaction-sintered tau siv dav ua cov khoom siv tshuaj lom neeg tseem ceeb. Nws muaj peb yam: rau kev tsim cov khoom siv abrasives; Siv los tsim cov khoom siv cua sov tiv taus - silicon molybdenum pas nrig, silicon carbon raj, thiab lwm yam; Rau kev tsim cov khoom siv refractory. Ua ib yam khoom siv refractory tshwj xeeb, nws yog siv rau hauv hlau thiab hlau smelting ua lub cub tawg hlau, cupola thiab lwm yam stamping ua, corrosion, puas tsuaj rau qhov chaw muaj zog ntawm cov khoom hluav taws; Hauv cov hlau tsis tshua muaj (zinc, txhuas, tooj liab) smelters rau melting cub tawg, molten hlau conveyor yeeb nkab, lim ntaus ntawv, clamp lauj kaub, thiab lwm yam; Thiab qhov chaw thev naus laus zis ua lub cav stamping lub taub hau, txuas ntxiv kub kub roj turbine hniav; Hauv kev lag luam silicate, ntau yam xws li ntau yam kev lag luam kiln shed, lub thawv hom tiv taus cub tawg them, saggar; Hauv kev lag luam tshuaj lom neeg, nws yog siv los ua roj tsim, roj nyoos carburetor, flue roj desulfurization cub tawg thiab lwm yam.

Siv cov khoom tsim α-SiC huv si, vim nws lub zog loj heev, nws nyuaj heev rau kev sib tsoo nws mus rau hauv nanoscale ultrafined hmoov, thiab cov khoom me me yog cov phaj lossis cov fibers, siv los sib tsoo rau hauv lub compact, txawm tias nyob rau hauv qhov cua sov rau nws qhov kub decomposition nyob ib puag ncig, yuav tsis tsim ib qho folding pom tseeb heev, tsis tuaj yeem sintered, qib densification ntawm cov khoom yog qis, thiab qhov tsis kam oxidation yog pluag. Yog li ntawd, nyob rau hauv kev lag luam tsim cov khoom, ib qho me me ntawm cov khoom me me spherical β-SiC ultrafine hmoov yog ntxiv rau α-SiC thiab xaiv cov additives kom tau txais cov khoom high-density. Raws li ib qho additive rau cov khoom sib txuas, raws li hom tuaj yeem faib ua hlau oxides, nitrogen compounds, 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 kua dej ntawm cov nplaum tsim tau yog ib lossis ntau yam ntawm hydroxymethylcellulose, acrylic emulsion, lignocellulose, tapioca starch, txhuas oxide colloidal kua, silicon dioxide colloidal kua, thiab lwm yam. Raws li hom additives thiab qhov sib txawv ntawm qhov ntxiv, qhov kub tua hluav taws ntawm lub compact tsis zoo ib yam, thiab qhov kub thiab txias yog 1400 ~ 2300 ℃. Piv txwv li, α-SiC70% nrog qhov faib me me ntawm ntau dua 44μm, β-SiC20% nrog qhov faib me me ntawm tsawg dua 10μm, av nplaum 10%, ntxiv rau 4.5% lignocellulosic kua 8%, sib xyaw sib npaug, tsim nrog 50MPa ua haujlwm siab, tua hauv huab cua ntawm 1400 ℃ rau 4 teev, Qhov pom tseeb ntawm cov khoom yog 2.53g / cm3, qhov pom tseeb porosity yog 12.3%, thiab lub zog tensile yog 30-33mpa. Cov khoom siv sintering ntawm ntau hom khoom nrog cov khoom ntxiv sib txawv tau teev nyob rau hauv Rooj 2.

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