Tsanangudzo yakajairika yeReaction Bonded SiC

Generaltsananguro yeReactionBonded SiC

Reaction Bonded SiC ine michina zvimiro uye oxidation kuramba. Mutengo wayo wakaderera. Munzanga yazvino, yakakwezva kutarisisa kwakawanda mumaindasitiri akasiyana.

SiC chisungo chakasimba che covalent. Mukuita sintering, mwero wekupararira wakaderera zvakanyanya. Panguva imwecheteyo, pamusoro pezvimedu zvinowanzovhara imwe yakaonda oxide layer iyo inotamba basa reiyo diffusion barriers. Pure SiC haina kucheneswa uye compact isina sintering additives. Kunyangwe kana iyo yekutsikirira-inopisa yakashandiswa, inofanirwawo kusarudza yakakodzera additives. Chete pakupisa kwakanyanya, zvinogona kuwanikwa zvinhu zvakakodzera engineering density padhuze ne theoretical density inogona kuwanikwa kubva ku1950 ℃ kusvika 2200 ℃. Panguva imwecheteyo, chimiro chayo uye saizi ichave shoma. Kunyangwe ma SIC macomposites anogona kuwanikwa nemhepo deposition, inogumira pakugadzirira yakaderera density kana yakatetepa layer zvinhu. Nekuda kwenguva yakareba yakanyarara, mutengo wekugadzira uchawedzera.

Reaction Bonded SiC yakagadzirwa muna 1950s naPopper. Nheyo yakakosha ndeiyi:

Pasi pechiito che capillary force, liquid silicon kana silicon alloy ine reactive chiitiko yakapinda mu porous ceramics ine kabhoni uye yakagadzira kabhoni silicon mukuita. Iyo ichangobva kuumbwa silicon carbide inosungirirwa kune yekutanga silicon carbide particles in situ, uye akasara pores mufiller anozadzwa neajenti yekuitisa kuti apedze densification maitiro.

Kuenzaniswa nemamwe maitiro esilicon carbide ceramics, iyo sintering process ine zvinotevera maitiro:

Kudzikira kupisa tembiricha, nguva pfupi yekugadzirisa, hapana kudikanwa kwemidziyo yakakosha kana inodhura;

Reaction Bonded zvikamu pasina shrinkage kana shanduko yehukuru;

Diversified molding nzira (extrusion, jekiseni, kudzvanya uye kudira).

Kune dzimwe nzira dzekuumba. Munguva yekupisa, hukuru hukuru uye zvigadzirwa zvakaoma zvinogona kugadzirwa pasina kudzvanywa. Iyo Reaction Bonded tekinoroji yesilicon carbide yakadzidzwa kwehafu yezana ramakore. Iyi tekinoroji yave imwe yekutarisa kweakasiyana maindasitiri nekuda kwemabhenefiti ayo akasiyana.