Silicon carbide ceramics ine yakanyanya tembiricha simba, yakakwira tembiricha oxidation kuramba, kupfeka kwakanaka kuramba, kunaka kugadzikana kwemafuta, diki coefficient yekuwedzera kwemafuta, yakakwira yekupisa conductivity, kuomarara kwepamusoro, kushomeka kwekushisa, makemikari ekudzivirira uye zvimwe zvinhu zvakanakisa.Yakave ichishandiswa zvakanyanya mumotokari, mechanization, kuchengetedza kwezvakatipoteredza, tekinoroji yemuchadenga, ruzivo zvemagetsi, simba uye mamwe minda, uye yave isingadzoreki dhizaini yekugadzira ine mashandiro akanaka muminda yakawanda yemaindasitiri.Zvino rega ndikuratidze!
Pressureless sintering
Pressureless sintering inoonekwa seyakanyanya kuvimbisa nzira yeSiC sintering.Zvinoenderana neakasiyana sintering masisitimu, kusamanikidzwa sintering kunogona kukamurwa kuita solid-phase sintering uye liquid-phase sintering.Kuburikidza ne-ultra-fine β- A chiyero chakakodzera cheB uye C (oxygen content isingasviki 2%) yakawedzerwa kuSiC powder panguva imwe chete, uye s.proehazka yakanyudzwa kuSiC sintered body ine density yakakwira kupfuura 98% pa2020 ℃.A. Mulla nevamwe.Al2O3 uye Y2O3 yakashandiswa sekuwedzera uye yakasvibiswa pa 1850-1950 ℃ ye 0.5 μ m β- SiC (chikamu chepamusoro chine zvishoma zveSiO2).Hurukuro hweiyo yakawanikwa SiC ceramics yakakura kupfuura 95% yeiyo theoretical density, uye saizi yezviyo idiki uye avhareji saizi.Iyo 1.5 microns.
Hot press sintering
Yakachena SiC inogona chete kunyungudutswa pamhepo yakanyanya tembiricha pasina chero sintering additives, saka vanhu vazhinji vanoita inopisa yekutsikirira sintering process yeSiC.Pakave nemishumo yakawanda pamusoro pekupisa kudzvanya sintering yeSiC nekuwedzera sintering aids.Alliegro et al.Akadzidza maitiro e boron, aluminium, nickel, iron, chromium uye zvimwe zvekuwedzera simbi paSiC densification.Mhedzisiro yacho inoratidza kuti aruminiyamu nesimbi ndiyo inonyanya kushanda yekuwedzera yekusimudzira SiC inopisa yekudzvanya sintering.FFlange yakadzidza mhedzisiro yekuwedzera huwandu hwakasiyana hweAl2O3 pane zvivakwa zveSiC inopisa yakadzvanywa.Inofungidzirwa kuti densification yeSiC inopisa yakadzvanywa inoenderana nemaitiro ekuparara uye kunaya.Nekudaro, iyo inopisa yekutsikisa sintering process inogona chete kuburitsa zvikamu zveSiC zvine chimiro chakareruka.Huwandu hwezvigadzirwa zvinogadzirwa neye-imwe nguva inopisa press sintering process idiki kwazvo, izvo zvisingaenderane nekugadzirwa kwemaindasitiri.
Kupisa isostatic kudzvanya sintering
Kuti akunde kukanganisa kwechinyakare sintering process, B-mhando uye C-mhando yakashandiswa sekuwedzera uye inopisa isostatic pressing sintering tekinoroji yakagamuchirwa.Pa1900 ° C, yakanaka crystalline ceramics ine density yakakura kupfuura 98 yakawanikwa, uye simba rekukotama patembiricha yekamuri raigona kusvika 600 MPa.Kunyangwe inopisa isostatic yekutsikirira sintering inogona kuburitsa yakaomesesa chikamu zvigadzirwa zvine maumbirwo akaomarara uye yakanaka michina zvivakwa, iyo sintering inofanirwa kuiswa chisimbiso, izvo zvakaoma kuwana kugadzirwa kwemaindasitiri.
Reaction sintering
Reaction sintered silicon carbide, inozivikanwawo se self bonded silicon carbide, inoreva maitiro ayo porous billet inopindirana negasi kana nhanho yemvura kunatsiridza kunaka kwebillet, kuderedza porosity, uye sinter yakapedzwa zvigadzirwa zvine rimwe simba uye chiyero chechokwadi.tora α- SiC hupfu uye graphite zvakasanganiswa mune imwe chikamu uye inopisa kusvika 1650 ℃ kuita sikweya billet.Panguva imwecheteyo, inopinda kana kupinda mubillet kuburikidza ne gaseous Si uye inopindirana ne graphite kuti iite β- SiC, yakasanganiswa neiyo iripo α-SiC particles.Kana Si yanyatsopinzwa, kuita sintered muviri une density yakakwana uye isiri shrinkage size inogona kuwanikwa.Kuenzaniswa nemamwe maitiro ekupisa, saizi shanduko yekuita sintering mukuita densification idiki, uye zvigadzirwa zvine saizi chaiyo zvinogona kugadzirwa.Nekudaro, kuvepo kwehuwandu hukuru hweSiC mumuviri wakanyoroveswa kunoita kuti iyo yepamusoro-tembiricha zvimiro zve reaction sintered SiC ceramics iwedzere.
Nguva yekutumira: Jun-08-2022