Kugadzira maitiro eiyo reactive sintering silicon carbide

Reaction-sintered silicon carbide chinhu chakakosha chepamusoro-tembiricha, chine simba rakawanda, kuomarara kwepamusoro, kusapfeka kwepamusoro, kukwirira kwecorrosion uye kupikisa kweoxidation yakakwira uye zvimwe zvinhu zvakanakisa, inoshandiswa zvakanyanya mumichina, aerospace, indasitiri yemakemikari, simba nezvimwe. minda.

 

1. Kugadzirira kwezvinhu

Kugadzirira kweiyo reactive sintering silicon carbide mbishi zvinhu zvinonyanya kabhoni uye silicon poda, iyo kabhoni inogona kushandiswa zvakasiyana-siyana zvekabhoni-ine zvinhu, semarasha coke, graphite, marasha, nezvimwewo, silicon poda inowanzosarudzwa nechidimbu. saizi ye1-5μm yakakwira kuchena kwesilicon poda. Kutanga, kabhoni nesilicon poda inosanganiswa mune imwe chikamu, ichiwedzera huwandu hwakakodzera hwebhainda uye inoyerera mumiririri, uye ichikurudzira zvakaenzana. Musanganiswa wacho unozoiswa muguyo rebhora rekugaya bhora kuti uenderere mberi nekusanganisa kusanganisa nekukuya kusvika saizi iri pasi pe1μm.

2. Molding process

Molding maitiro ndeimwe yematanho akakosha mukugadzirwa kwesilicon carbide. Inowanzo shandiswa kuumba maitiro ari kudzvanya kuumba, grouting molding uye static molding. Kugadzira Press kunoreva kuti musanganiswa unoiswa muforoma uye unogadzirwa ne mechanical pressure. Grouting molding (Grouting molding) zvinoreva kusanganisa musanganiswa nemvura kana organic solvent, kuipinza muforoma kuburikidza nesirinji pasi pevacuum condition, uye kugadzira chigadzirwa chapera mushure mekumira. Static pressure molding inoreva musanganiswa muforoma, pasi pekuchengetedzwa kwevacuum kana mamiriro ekunze ekuumba static pressure molding, kazhinji pakumanikidzwa kwe20-30MPa.

3. Sintering process

Sintering inhanho yakakosha mukugadzira maitiro ekuita-sintered silicon carbide. Sintering tembiricha, sintering nguva, sintering mamiriro uye zvimwe zvinhu zvinokanganisa kuita kwekuita-sintered silicon carbide. Kazhinji, tembiricha yekupisa ye reactive sintering silicon carbide iri pakati pe2000-2400 ℃, nguva yekunyura inowanzova maawa 1-3, uye mhepo yekupisa inowanzoita inert, senge argon, nitrogen, zvichingodaro. Munguva yekupisa, musanganiswa unozosangana nemakemikari kuita kuti aumbe silicon carbide makristasi. Panguva imwecheteyo, kabhoni ichaitawo nemagasi ari mumhepo kugadzira magasi akadai seCO uye CO2, izvo zvinokanganisa kuwanda uye zvimiro zvesilicon carbide. Naizvozvo, kuchengetedza yakafanira sintering mamiriro uye sintering nguva kwakakosha zvikuru pakugadzira reaction-sintered silicon carbide.

4. Mushure mekurapa maitiro

Reaction-sintered silicon carbide inoda post-kurapwa maitiro mushure mekugadzira. Zvakajairika mushure mekurapa maitiro machining, kugaya, kupukuta, oxidation uye zvichingodaro. Aya maitiro akagadzirirwa kuvandudza iyo chaiyo uye yepamusoro mhando yeanoita-sintered silicon carbide. Pakati pavo, kukuya uye kupukuta inzira yakajairika yekugadzirisa, iyo inogona kuvandudza kupedzisa uye flatness yesilicon carbide pamusoro. Oxidation process inogona kuumba oxide layer yekuwedzera oxidation kuramba uye kugadzikana kwekemikari ye reaction-sintered silicon carbide.

Muchidimbu, reactive sintering silicon carbide kugadzira inzira yakaoma, inoda kugona akasiyana matekinoroji uye maitiro, anosanganisira mbishi kugadzirira, kuumba maitiro, sintering maitiro uye mushure mekurapa maitiro. Chete nekunyatsogona tekinoroji uye maitiro anogona kugadzirwa emhando yepamusoro reaction-sintered silicon carbide kuti isangane nezvinodiwa zveakasiyana maficha ekushandisa.