Maitiro ekugadzira reactive sintering silicon carbide

Kabhoni yesilicon ine reaction-sintered chinhu chakakosha chinodziya zvakanyanya, chine simba guru, kuomarara kwakanyanya, kuramba kupfeka kwakanyanya, kuramba ngura zvakanyanya uye kuramba kuoxidation kwakanyanya uye zvimwe zvinhu zvakanaka, chinoshandiswa zvakanyanya mumichina, mundege, indasitiri yemakemikari, simba nedzimwe nzvimbo.

 

1. Kugadzirira zvinhu zvisina kugadzirwa

Kugadzirwa kwezvinhu zvakagadziriswa zvesilicon carbide zvinosanganisa carbon nesilicon powder, izvo zvinogona kushandiswa necarbon powder, zvakaita se coal coaster, graphite, charcoal, nezvimwewo, silicon powder inowanzo sarudzwa ine saizi ye particle size ye 1-5μm high purity silicon powder. Kutanga, carbon nesilicon powder zvinosanganiswa muchikamu chakati, zvichiwedzera huwandu hwakakodzera hwe binder uye flow agent, uye zvichikurunga zvakaenzana. Musanganiswa wacho unozoiswa mu ball mill kuti ball mill igadziriswe kuti iwedzere kusanganiswa nekukuyiwa kusvika saizi ye particle yave pasi pe 1μm.

2. Maitiro ekuumba

Maitiro ekuumba ndeimwe yematanho akakosha mukugadzira silicon carbide. Maitiro ekuumba anowanzo shandiswa ndeekudzvanya molding, grouting molding uye static molding. Press forming zvinoreva kuti musanganiswa unoiswa mumold uye unogadzirwa nekumanikidzwa kwemuchina. Grouting molding zvinoreva kusanganisa musanganiswa nemvura kana organic solvent, kuupinza mumold kuburikidza nesirinjisi pasi pemamiriro evacuum, uye kugadzira chigadzirwa chapera mushure mekumira. Static pressure molding inoreva musanganiswa mumold, pasi pekuchengetedzwa kwevacuum kana atmosphere ye static pressure molding, kazhinji pa pressure ye 20-30MPa.

3. Maitiro ekuchenesa

Kupisa simbi inhanho huru mukugadzirwa kwe silicon carbide inosanganiswa ne reaction-sintered. Kupisa kwekupisa, nguva yekupisa, mhepo inoputika nezvimwe zvinhu zvinokanganisa mashandiro e silicon carbide inosanganiswa ne reaction-sintered. Kazhinji, tembiricha yekupisa ye silicon carbide inosanganiswa ne reaction iri pakati pe 2000-2400℃, nguva yekupisa inowanzova maawa 1-3, uye mhepo inoputika inowanzova isina simba, senge argon, nitrogen, nezvimwewo. Munguva yekupisa, musanganiswa uchasangana ne chemical reaction kuti ugadzire silicon carbide crystals. Panguva imwe chete, kabhoni ichaitawo magasi ari mumhepo kuti ibudise magasi akadai seCO2 neCO2, izvo zvinokanganisa huwandu uye hunhu hwe silicon carbide. Nokudaro, kuchengetedza mhepo yakakodzera yekupisa nenguva yekupisa zvakakosha zvikuru pakugadzira silicon carbide inosanganiswa ne reaction-sintered.

4. Maitiro ekurapa mushure mekurapwa

Silicon carbide inogadzirwa ne reaction-sintered inoda nzira yekurapa mushure mekugadzirwa. Maitiro akajairika ekurapa mushure mekugadzirwa ndeekugadzira, kukuya, kupukuta, oxidation nezvimwewo. Maitiro aya akagadzirirwa kuvandudza kunyatsojeka uye kunaka kwepamusoro pe silicon carbide inogadzirwa ne reaction-sintered. Pakati pawo, nzira yekugaya nekupukuta inzira yakajairika yekugadzirisa, iyo inogona kuvandudza kupedzwa uye kutsetseka kwepamusoro pe silicon carbide. Maitiro ekugadzira oxidation anogona kugadzira oxide layer kuti iwedzere kuramba kwe oxidation uye kugadzikana kwemakemikari kwe silicon carbide inogadzirwa ne reaction-sintered.

Muchidimbu, kugadzira silicon carbide inochinja-chinja ibasa rakaoma, rinoda hunyanzvi hwemhando dzakasiyana-siyana, kusanganisira kugadzira zvinhu zvisina kugadzirwa, kugadzira molding, kugadzira sintering uye kugadzira mushure mekurapwa. Zvinhu zvesilicon carbide zvinogadzirwa nemaitiro emhando yepamusoro zvinogona kugadzirwa kuti zvienderane nezvinodiwa neminda yakasiyana-siyana yekushandisa.