Silicon carbide (SiC) ceramicszvave zvinhu zvepakati mumunda wepamusoro-tembiricha zvimiro zveceramics nekuda kwekuderera kwavo kwekuwedzera kwekuwedzera kwemafuta, yakakwira yekupisa conductivity, kuoma kwakanyanya, uye yakanakisa kupisa uye kugadzikana kwemakemikari. Iwo anoshandiswa zvakanyanya muminda yakakosha senge aerospace, simba renyukireya, mauto, uye semiconductors.
Nekudaro, iyo yakanyanya kusimba covalent zvisungo uye yakaderera diffusion coefficient yeSiC inoita kuti densation yayo iome. Kuti izvi zviitike, iyo indasitiri yakagadzira akasiyana sintering matekinoroji, uye SiC ceramics yakagadzirirwa neakasiyana matekinoroji ine misiyano yakakura mu microstructure, zvivakwa, uye mamiriro ekushandisa. Heino ongororo yeakakosha maitiro ezvishanu mainstream silicon carbide ceramics.
1. Non pressure sintered SiC ceramics (S-SiC)
Core zvakanakira: Inokodzera akawanda ekuumba maitiro, yakaderera mutengo, isina kuganhurirwa nechimiro uye saizi, ndiyo iri nyore sintering nzira yekuwana kugadzirwa kwakawanda. Nekuwedzera boron uye kabhoni ku β - SiC ine trace uwandu hweokisijeni uye kuiisa pasi pemhepo inert inotenderera 2000 ℃, muviri wakaomeswa une theoretical density ye98% inogona kuwanikwa. Pane maitiro maviri: chikamu chakasimba uye chikamu chemvura. Iyo yekare ine yakakwirira density uye kuchena, pamwe nepamusoro yekushisa conductivity uye yakakwirira-kupisa simba.
Typical applications: Misa kugadzirwa kwekusapfeka-resistant uye corrosion-resistant sealing rings uye sliding bearings; Nekuda kwekuoma kwayo kwakanyanya, kuderera kwesimba rinokwevera zvinhu pasi, uye kuita kwakanaka kwebhora, inoshandiswa zvakanyanya sechivharo chepfuti dzemotokari nengarava, pamwe nekudzivirira masafefa evanhu nemotokari dzekutakura mari. Kupokana kwayo kwakawanda kwakakwira kune akajairwa SiC ceramics, uye iyo yekutyoka poindi yecylindrical lightweight inodzivirira yezvombo inogona kusvika pamusoro pe65 matani.
2. Reaction sintered SiC ceramics (RB SiC)
Core zvakanakira: Yakanakisa mechini kuita, yakakwira simba, corrosion resistance, uye oxidation kuramba; Yakaderera sintering tembiricha uye mutengo, unokwanisa kugadzira pedyo net size. Maitiro acho anosanganisira kusanganisa kabhoni sosi neSiC poda kugadzira billet. Pakupisa kwakanyanya, silicon yakanyungudutswa inopinda mubillet uye inopindirana nekabhoni kuti iite β - SiC, iyo inobatanidza neyokutanga α - SiC uye inozadza pores. Saizi shanduko panguva sintering idiki, ichiita kuti ive yakakodzera kugadzirwa kwemaindasitiri ezvakaoma maumbirwo zvigadzirwa.
Mashandisirwo akajairika: Yekupisa tembiricha yemidziyo, machubhu anopenya, anotsinhanisa kupisa, desulfurization nozzles; Nekuda kwekudzikira kwayo kupisa kwekuwedzera coefficient, yakakwira elastic modulus, uye padyo net mambure ekugadzira maitiro, yave chinhu chakanakira nzvimbo inoratidzira; Inogona zvakare kutsiva girazi requartz sechinhu chinotsigira machubhu emagetsi uye semiconductor chip kugadzira michina.
3. Inopisa yakadzvanywa sintered SiC ceramics (HP SiC)
Core advantage: Synchronous sintering pasi pekushisa kwepamusoro uye kudzvinyirirwa kwepamusoro, hupfu huri mu thermoplastic state, iyo inobatsira pakugadzirisa hukuru. Inogona kuburitsa zvigadzirwa zvine zviyo zvakatsetseka, kusimba kwepamusoro, uye yakanaka michina zvivakwa pakudzika kwakadzika uye munguva pfupi, uye inogona kuwana density yakakwana uye pedyo yakachena sintering state.
Kushandiswa kwakajairika: Pakutanga yakashandiswa sevhavha dzemabhuru evashandi veherikoputa yeUS munguva yeHondo yeVietnam, musika wezvombo wakatsiviwa nehot pressed boron carbide; Parizvino, inonyanya kushandiswa mumamiriro epamusoro-akawedzera kukosha, senge minda ine zvakanyanyisa zvinodikanwa zvekugadzirisa kuumbwa, kuchena, uye densification, pamwe nekupfeka-inodzivirira uye nyukireya indasitiri minda.
4. Recrystallized SiC ceramics (R-SiC)
Core mukana: Hapana chikonzero chekuwedzera sintering aids, inzira yakajairika yekugadzirira yakanyanya kuchena uye yakakura maSiC zvishandiso. Maitiro acho anosanganisira kusanganisa coarse uye yakanaka SiC poda muchiyero uye kuagadzira, kuapinza muinert atmosphere pa2200 ~ 2450 ℃. Zvimedu zvakapfava zvinonyunguduka uye zvinomonereka pakusangana kuri pakati pezvakakora zvimedu kuti zvigadzire dhaimani, nekuoma kwesekondi kubva kudhaimani. SiC inochengetedza yakakwira-tembiricha simba, corrosion resistance, oxidation resistance, uye thermal shock resistance.
Typical applications: High tembiricha honi fenicha, kupisa exchanger, combustion nozzles; Munzvimbo dzemuchadenga nemauto, inoshandiswa kugadzira zvinhu zvemuchadenga zvakaita seinjini, zvimbi zvemuswe, uye fuselage, izvo zvinogona kuvandudza mashandiro emidziyo uye hupenyu hwebasa.
5. Silicon yakapinza SiC ceramics (SiSiC)
Core zvakanakira: Yakanyanya kukodzera kugadzirwa kwemaindasitiri, ine nguva diki yekunyungudika, tembiricha yakaderera, dense yakazara uye isina kuremara, inoumbwa neSiC matrix uye yakapinda Si phase, yakakamurwa kuita maviri maitiro: kupinza kwemvura uye kupinza gasi. Iyo yekupedzisira ine mutengo wakakwira asi zvirinani density uye kufanana kwesilicon yemahara.
Maitiro ekushandisa: low porosity, yakanaka airtightness, uye kushomeka kushoma kunobatsira kubvisa static magetsi, akakodzera kugadzira yakakura, yakaoma kana maburi zvikamu, zvinowanzoshandiswa mumichina yekugadzirisa semiconductor; Nekuda kweiyo yakakwira elastic modulus, huremu, simba rakakwirira, uye yakanakisa mhepo, ndiyo inofarirwa yepamusoro-inoita zvinhu mundima yeaerospace, iyo inogona kumira mitoro munzvimbo dzemuchadenga uye ive nechokwadi chechokwadi chemidziyo uye kuchengetedzeka.
Nguva yekutumira: Sep-02-2025