Tsananguro yakajairika yeReaction Bonded SiC

Mukurutsananguro yeMaitiroSiC Yakabatana

Reaction Bonded SiC ine hunhu hwemakanika uye inodzivirira oxidation. Mutengo wayo wakaderera. Munharaunda yanhasi, yave ichikwezva vanhu vakawanda mumaindasitiri akasiyana-siyana.

SiC chisungo chakasimba kwazvo che covalent. Mukusviba, mwero wekupararira wakaderera zvikuru. Panguva imwe chete, pamusoro pezvikamu zvinowanzo fukidza ganda rakatetepa re oxide iro rinoita basa re diffusion barrier. Pure SiC hainyatso sviba uye hainyatso sviba pasina sintering additives. Kunyangwe kana nzira yekudzvanya inopisa ikashandiswa, inofanirawo kusarudza additives dzakakodzera. Pakupisa kwakanyanya chete, zvinhu zvakakodzera engineering density iri pedyo ne theoretical density zvinogona kuwanikwa izvo zvinofanira kuva pakati pe1950 ℃ kusvika 2200 ℃. Panguva imwe chete, chimiro chayo nehukuru zvichave zvishoma. Kunyangwe SIC composites ichigona kuwanikwa ne vapor deposition, inongogumira pakugadzirira low density kana thin layer materials. Nekuda kwenguva yayo refu yakanyarara, mutengo wekugadzira uchawedzera.

Reaction Bonded SiC yakagadzirwa muna 1950 naPopper. Musimboti wekutanga ndewekuti:

Pasi pesimba re capillary, silicon yemvura kana silicon alloy ine reactive activity yakapinda mu ceramics dzine porous dzine carbon uye carbon silicon yakagadzirwa mu reaction. Silicon carbide ichangobva kugadzirwa inosungirirwa kune silicon carbide particles yekutanga in situ, uye ma pores akasara ari mu filler anozadzwa ne impregnating agent kuti apedzise densification process.

Kana tichienzanisa nedzimwe nzira dze silicon carbide ceramics, nzira yekupisa ine hunhu hunotevera:

Kupisa kwakaderera kwekugadzirisa, nguva pfupi yekugadzirisa, hapana chikonzero chemidziyo yakakosha kana inodhura;

Zvikamu zvakabatana zvisina kuderera kana kuchinja saizi;

Nzira dzakasiyana-siyana dzekuumba (kuburitsa, kubaya, kudzvanya uye kudurura).

Kune nzira dzakawanda dzekuumba. Panguva yekusinta, zvigadzirwa zvakakura uye zvakaoma zvinogona kugadzirwa pasina kumanikidzwa. Tekinoroji yeReaction Bonded yesilicon carbide yakadzidzwa kwemakumi mashanu emakore. Tekinoroji iyi yave imwe yenzvimbo dzinonyanya kutariswa mumaindasitiri akasiyana-siyana nekuda kwezvakanaka zvayo zvakasiyana.