Nekuda kwehunhu hwayo hwakanaka hwemuviri, reaction-sintered silicon carbide yakashandiswa zvakanyanya sechinhu chikuru chemakemikari mbishi. Chiyero chayo chekushandiswa chine zvinhu zvitatu: zvekugadzirwa kweabrasives; Inoshandiswa kugadzira zvinodzivirira kupisa zvikamu - silicon molybdenum tsvimbo, silicon kabhobhu chubhu, nezvimwewo; Yekugadzira zvigadzirwa zve refractory. Sechinhu chakakosha chinopesana, chinoshandiswa musimbi uye simbi kunyunguduka sesimbi inoputika choto, cupola uye kumwe kutsika kwekugadzirisa, kuora, kukuvadza kune nzvimbo yakasimba yezvigadzirwa zvisingasviki moto; Mune isingawanzo simbi (zingi, aruminiyamu, mhangura) inonyungudutsa yekunyungudutsa choto chemoto, yakanyungudutswa simbi inotakura pombi, sefa mudziyo, clamp poto, nezvimwewo; Uye muchadenga tekinoroji seanodhinda injini muswe nozzle, inoenderera tembiricha yakakwira gasi turbine blade; Muindasitiri yesilicate, yakawanda seyakasiyana maindasitiri honi shed, bhokisi remhando yekupikisa choto kubhadharisa, saggar; Muindasitiri yemakemikari, inoshandiswa sechizvarwa chegasi, crude oil carburetor, flue gas desulfurization furnace uye zvichingodaro.
Kushandiswa kwakachena kwea-SiC zvigadzirwa zvekugadzira, nekuda kwesimba rayo rakakura, zvakaoma kwazvo kuikuya mu nanoscale ultrafined poda, uye zvimedu mahwendefa kana fiber, anoshandiswa kugaya mukati me compact, kunyangwe mukupisa kusvika pakuora kwayo. tembiricha yakatenderedza, haizobudise kupeta kuri pachena, haigone kunyudzwa, iyo densification level yezvigadzirwa yakadzikira, uye oxidation kuramba haina kunaka. Nokudaro, mukugadzirwa kwemaindasitiri ezvigadzirwa, chikamu chiduku chezvinyorwa spherical β-SiC ultrafine powder inowedzerwa ku α-SiC uye kusarudzwa kwezvinowedzera kuti uwane zvigadzirwa zvepamusoro-density. Sekuwedzera kwechigadzirwa chekubatanidza, maererano nemhando inogona kukamurwa kuita simbi oxides, nitrogen makomisheni, yakakwirira kuchena graphite, senge ivhu, aluminium oxide, zircon, zirconium corundum, lime poda, laminated girazi, silicon nitride, silicon oxynitride, yakakwirira. kuchena graphite uye zvichingodaro. Iyo aqueous solution yekugadzira adhesive inogona kuva imwe kana kupfuura yehydroxymethylcellulose, acrylic emulsion, lignocellulose, tapioca starch, aluminium oxide colloidal solution, silicon dioxide colloidal solution, etc. Maererano nemhando yezvinowedzera uye mutsauko wehuwandu hwekuwedzera, tembiricha yekupisa yekombuta haina kufanana, uye tembiricha yemhando ndeye 1400 ~ 2300 ℃. Semuyenzaniso, α-SiC70% ine particle size yekugovera inopfuura 44μm, β-SiC20% ine particle size kugovera isingasviki 10μm, ivhu 10%, pamwe ne4.5% lignocellulosic solution 8%, yakaenzana yakasanganiswa, yakaumbwa ne50MPa ichishanda. kumanikidzwa, kupfurwa mumhepo pa1400 ℃ kwe4h, Iyo inooneka density yechigadzirwa ndeye 2.53g/cm3, iyo inooneka porosity ndeye 12.3%, uye simba rekusimba iri 30-33mpa. Iyo sintering zvivakwa zvemarudzi akati wandei ezvigadzirwa zvine akasiyana ekuwedzera akanyorwa muTafura 2.
Kazhinji, reaction-sintered silicon carbide refractories ine hupamhi hwemhando yepamusoro mune ese maficha, senge yakasimba yekumanikidza kusimba, yakasimba yekupisa kuvhundutsa kuramba, kupfeka kwakanaka kuramba, yakasimba yekupisa conductivity uye solvent corrosion kuramba pane yakafara tembiricha. Nekudaro, zvinofanirwawo kuoneka kuti kukanganisa kwayo ndeyekuti iyo antioxidant mhedzisiro haina kunaka, izvo zvinokonzeresa kuwedzera kwevhoriyamu uye deformation munzvimbo yepamusoro yekupisa kudzikisa hupenyu hwebasa. Kuti ive nechokwadi chekupokana kweoxidation ye reaction-sintered silicon carbide refractories, basa rakawanda rekusarudza rakaitwa pane yekubatanidza layer. Iko kushandiswa kwevhu (ine simbi oxides) fusion, asi haina kupa buffer effect, silicon carbide zvimedu zvichiri pasi pemhepo oxidation uye corrosion.
Nguva yekutumira: Jun-21-2023