Ngenxa yezakhiwo zayo ezinhle zomzimba, i-react-sintered silicon carbide iye yasetshenziswa kabanzi njengezinto ezisetshenziswa kakhulu zamakhemikhali. Ububanzi bayo besicelo bunezici ezintathu: ukukhiqizwa kwama-abrasives; Isetshenziselwa ukukhiqiza ukumelana nokushisa izingxenye - i-silicon molybdenum rod, i-silicon carbon tube, njll.; Ukuze kwenziwe imikhiqizo refractory. Njengento ekhethekile ephikisayo, isetshenziswa ekuncibilikeni kwensimbi nensimbi njengesithando somlilo sensimbi, i-cupola nokunye ukucubungula isitembu, ukugqwala, ukulimala endaweni eqinile yemikhiqizo engashi; Ezincibilikisini zensimbi ezingavamile (zinc, i-aluminium, ithusi) zokuncibilikisa imali yesithando somlilo, ipayipi lokuthutha lensimbi elincibilikisiwe, idivayisi yokuhlunga, ibhodwe lokuqinisa, njll.; Futhi ubuchwepheshe emkhathini njengoba injini isitembu umlomo wombhobho umsila, okuqhubekayo lokushisa eliphezulu igesi yemvelo turbine blade; Embonini ye-silicate, eziningi njengezinhlobonhlobo zeshede lezimboni, uhlobo lwebhokisi lokumelana nesithando somlilo, i-saggar; Embonini yamakhemikhali, isetshenziswa njengesizukulwane segesi, i-carburetor kawoyela ongahluziwe, isithando somlilo se-flue gas desulfurization nokunye.
Ukusetshenziswa okuhlanzekile kwemikhiqizo yokukhiqiza i-α-SiC, ngenxa yamandla ayo amakhulu, kunzima kakhulu ukuyigaya ibe yi-nanoscale ultrafined powder, futhi izinhlayiya zingamapuleti noma imicu, esetshenziselwa ukugaya ku-compact, ngisho nasekushiseni ekuboleni kwayo. izinga lokushisa elizungezile, ngeke likhiqize ukugoqa okusobala kakhulu, alikwazi ukucwiliswa, izinga lokuminyana lemikhiqizo liphansi, futhi ukumelana ne-oxidation kubi. Ngakho-ke, ekukhiqizweni kwemikhiqizo yezimboni, inani elincane le-particle spherical β-SiC ultrafine powder yengezwe ku-α-SiC nokukhethwa kwezithasiselo ukuze kutholwe imikhiqizo ephezulu kakhulu. Njengesengezo sokuhlanganiswa komkhiqizo, ngokusho kohlobo kungahlukaniswa ngama-oxide ensimbi, izinhlanganisela ze-nitrogen, i-graphite yokuhlanzeka okuphezulu, njengobumba, i-aluminium oxide, i-zircon, i-zirconium corundum, i-lime powder, ingilazi elaminethiwe, i-silicon nitride, i-silicon oxynitride, ephezulu. ubumsulwa graphite nokunye. Isixazululo samanzi se-adhesive yokwakha singaba eyodwa noma ngaphezulu ye-hydroxymethylcellulose, i-acrylic emulsion, i-lignocellulose, isitashi se-tapioca, isixazululo se-aluminium oxide colloidal, isixazululo se-silicon dioxide colloidal, njll. Ngokusho kohlobo lwezithasiselo kanye nomehluko enanini lokwengeza, izinga lokushisa lokudubula le-compact alifani, futhi izinga lokushisa liyi-1400 ~ 2300 ℃. Isibonelo, i-α-SiC70% enosayizi wezinhlayiyana wokusatshalaliswa okungaphezu kuka-44μm, β-SiC20% enosayizi wezinhlayiyana wokusabalalisa okungaphansi kuka-10μm, ubumba 10%, kanye no-4.5% wesisombululo se-lignocellulosic 8%, esixutshwe ngokulinganayo, sakhiwe nge-50MPa esebenzayo. ingcindezi, eqhunyiswa emoyeni ku-1400 ℃ isikhathi esingu-4h, Ukuminyana okubonakalayo komkhiqizo 2.53g/cm3, i-porosity ebonakalayo ingu-12.3%, futhi amandla aqinile angama-30-33mpa. Izakhiwo ze-sintering zezinhlobo ezimbalwa zemikhiqizo enezithasiselo ezihlukene zibalwe kuThebula 2.
Ngokuvamile, i-refractories ye-silicon carbide yokusabela-sintered inezakhiwo zekhwalithi ephezulu kuzo zonke izici, njengamandla okucindezela aqinile, ukumelana nokushaqeka okushisayo okuqinile, ukumelana nokugqoka okuhle, ukuguquguquka okushisayo okuqinile kanye nokumelana nokubola kwe-solvent phezu kwebanga lokushisa elibanzi. Kodwa-ke, kufanele futhi kubonakale ukuthi ukungahambi kahle kwayo ukuthi umphumela we-antioxidant awulungile, obangela ukwanda kwevolumu kanye nokuguqulwa endaweni yokushisa okuphezulu ukunciphisa impilo yesevisi. Ukuze kuqinisekiswe ukumelana kwe-oxidation kwe-refractories ye-silicon carbide refractories, umsebenzi omningi wokukhetha wenziwe kungqimba lokubopha. Ukusetshenziswa kobumba (okuqukethe ama-oxide ensimbi), kodwa akuzange kunikeze umphumela we-buffer, izinhlayiya ze-silicon carbide zisangaphansi kwe-air oxidation kanye nokugqwala.
Isikhathi sokuthumela: Jun-21-2023