Mumunda wakakura wesainzi yemidziyo, silicon carbide ceramics yave "mudiwa" weminda yakawanda yepamusoro-soro nekuda kwehunhu hwayo hwakanaka hwakadai sekuomarara kwepamusoro, kusimba kwepamusoro, kugadzikana kwakanaka kwekupisa, uye kugadzikana kwemakemikari. Kubva paaerospace kusvika pakugadzira semiconductor, kubva kumotokari nyowani dzesimba kuenda kumaindasitiri emuchina, silicon carbide ceramics inoita basa rinokosha. Mugadziriro yegadziriro yesilicon carbide ceramics, iyo sintering nzira ndiyo yakakosha inotaridza zvimiro zvayo uye mashandisirwo emhando. Nhasi, isu tichanyura mune sintering maitiro esilicon carbide uye takatarisana nekuongorora yakasarudzika mabhenefiti ekuita sintered.silicon carbide ceramics.
Yakajairika sintering nzira dzesilicon carbide
Kune nzira dzakasiyana-siyana dzekuisa silicon carbide, imwe neimwe iine misimboti yayo yakasarudzika uye maitiro.
1. Kupisa kunopisa sintering: Iyi sintering nzira inosanganisira kuisa silicon carbide powder muforoma, kushandisa imwe dzvinyiriro paunenge uchipisa, kupedzisa kuumba uye kunyura maitiro panguva imwe chete. Kupisa kudzvanya sintering kunogona kuwana dense silicon carbide ceramics pane yakadzika tembiricha uye munguva pfupi yenguva, ine saizi yezviyo yakanaka uye yakanaka michina zvivakwa. Nekudaro, iyo inopisa yekutsikirira sintering michina yakaoma, mutengo wekuumbwa wakakwira, zvinodiwa zvekugadzira zvakaomarara, uye zvikamu zvakapfava chete zvinogona kugadzirwa, zvichikonzera kuderera kwekugadzira kushanda, izvo kune imwe nhanho inodzikamisa yayo yakakura-chiyero.
2. Atmospheric pressure sintering: Atmospheric pressure sintering ndiyo nzira ye densification sintering yesilicon carbide nekuipisa kusvika 2000-2150 ℃ pasi pemhepo yemhepo uye inert mamiriro ekunze, nekuwedzera zvakakodzera sintering aids. Iyo yakakamurwa kuita maviri maitiro: solid-state sintering uye liquid-phase sintering. Solid phase sintering inogona kuwana yakakwira density yesilicon carbide, isina girazi chikamu pakati pemakristasi, uye yakanakisa yepamusoro-tembiricha michina zvivakwa; Liquid phase sintering ine zvakanakira yekudzikira sintering tembiricha, diki saizi yezviyo, uye yakagadziridzwa simba rekukotama uye kuomarara kwekutsemuka. Atmospheric pressure sintering haina zvirambidzo pachimiro chechigadzirwa uye saizi, mitengo yakaderera yekugadzira, uye yakanakisa yakazara zvinhu zvivakwa, asi tembiricha yekupisa yakakwira uye mashandisiro esimba akakwira.
3. Reaction sintering: Reaction sintered silicon carbide yakatanga kutaurwa naP. Popper kuma1950. Maitiro acho anosanganisira kusanganisa kabhoni sosi uye silicon carbide poda, uye kugadzirira iyo yakasvibira muviri kuburikidza nenzira dzakadai sejekiseni kuumba, yakaoma kudzvanya, kana kutonhora isostatic kudzvanya. Zvadaro, billet rinopisa kusvika pamusoro pe1500 ℃ pasi pevacuum kana inert atmosphere, panguva iyo silicon yakasimba inonyunguduka musilicon yemvura, iyo inopinda mubillet ine pores kuburikidza necapillary action. Liquid silicon kana silicon vapor inopinda kemikari inopindirana neC mumuviri wakasvibira, uye in-situ inogadzirwa β - SiC inosanganiswa neiyo yekutanga SiC particles mumuviri wegirinhi kuita reaction sintered silicon carbide ceramic zvinhu.
Zvakanakira Reaction Sintering Silicon Carbide Ceramics
Kuenzaniswa nedzimwe nzira dzekuisa, reaction sintered silicon carbide ceramics ine zvakawanda zvakakosha zvakanakira:
1. Yakaderera sintering tembiricha uye inodzoreka mutengo: The reaction sintering tembiricha kazhinji yakadzikira pane yemhepo sintering tembiricha, inoderedza zvakanyanya kushandiswa kwesimba uye yakanyanya tembiricha kuita zvinodiwa zvesintering michina. Kudzikira sintering tembiricha inoreva kuderera kwemitengo yekuchengetedza michina uye kuderedzwa kwesimba rekushandisa panguva yekugadzira, zvinobudirira kudzikisa mutengo wekugadzira. Izvi zvinoita kuti reaction sintered silicon carbide ceramics ine zvakakosha zvehupfumi zvakanakira mukugadzirwa kwakakura.
2. Pedyo net mambure ekugadzira, akakodzera kune yakaoma zvimiro: Panguva yekupindura sintering process, zvinhu zvacho hazviite kupfuudza vhoriyamu shrinkage. Hunhu uhwu hunoita kuti hunyatsokodzera kugadzirira hukuru-hukuru, hwakaoma hwakaita maumbirwo ezvikamu. Ingave yakanyatso mashandiro emuchina kana makuru maindasitiri emidziyo, reaction sintered silicon carbide ceramics inogona kunyatso kuzadzisa dhizaini zvinodiwa, kuderedza anotevera ekugadzirisa matanho, kunatsiridza kugadzirwa kwakanaka, uye zvakare kuderedza kurasikirwa kwezvinhu uye kuwedzera mutengo kunokonzerwa nekugadzirisa.
3. High degree of material densification: Nekudzora maitiro ekuita zvine musoro, reaction sintering inogona kuwana yakakwira densification yesilicon carbide ceramics. Iyo dense chimiro chinopa izvo zvinhu zvakanakisa zvemuchina zvivakwa, senge yakakwira kukotama simba uye kumanikidza simba, zvichiita kuti ichengetedze kuvimbika kwechimiro pasi pemasimba akakosha ekunze. Panguva imwecheteyo, iyo dense chimiro zvakare inokwidziridza kupfeka kuramba uye kushora kuramba kwezvinhu, zvichibvumira kuti ishande zvakatsiga munzvimbo dzakaoma dzekushanda uye kuwedzera hupenyu hwayo hwesevhisi.
4. Kugadzikana kwekemikari yakanaka: Reaction sintered silicon carbide ceramics ine kupikisa kwakanyanya kune yakasimba acids nesimbi yakanyungudutswa. Mumaindasitiri akadai sekemikari uye simbi, midziyo inowanzoda kusangana neyakasiyana siyana inoparadza midhiya. Reaction sintered silicon carbide ceramics inogona kunyatso ramba kukukurwa kweiyi midhiya, kuve nechokwadi chekushanda kwakajairika kwemidziyo, kuderedza kugadzirisa uye kutsiva mutengo, nekuvandudza kuenderera kwekugadzira uye kugadzikana.
Inoshanda zvakanyanya munzvimbo dzakasiyana siyana
Nezvakanakira izvi, reaction sintered silicon carbide ceramics yakashandiswa zvakanyanya muminda yakawanda. Mumunda wemidziyo yekupisa yekupisa, inogona kumirisana nemamiriro ekunze ekupisa uye kuve nechokwadi chekushanda kwakanaka kwemoto; Muchitsinhanisi chekupisa, yavo yakanakisa yekupisa conductivity uye kushorwa kwekudzivirira kunoita kuti ive sarudzo yakanaka yezvinhu; Mumidziyo yekudzivirira kwezvakatipoteredza senge desulfurization nozzles, inogona kuramba kukukurwa kweiyo corrosive media uye kuve nechokwadi chekushanda kwakagadzikana kwenguva refu kwemidziyo. Pamusoro pezvo, reaction sintered silicon carbide ceramics inoitawo basa rakakosha muminda yepamusoro senge photovoltaics uye aerospace.
Reaction sintered silicon carbide ceramics inogara pachinzvimbo chakakosha mumhuri yesilicon carbide ceramic nekuda kwekunaka kwavo kwakasiyana. Nekuenderera mberi kwekufambira mberi kwetekinoroji uye nekuenderera mberi kwekugadzirisa kwemaitiro, zvinotendwa kuti reaction sintered silicon carbide ceramics icharatidza kuita kwavo kwakanakisa mune mamwe minda, ichipa yakasimba rutsigiro rwezvinhu mukusimudzira maindasitiri akasiyana.
Nguva yekutumira: Jun-13-2025