Breakthrough sic kukula key core material

Pamene silicon carbide crystal ikukula, "malo" a kukula kwa mawonekedwe pakati pa axial pakati pa kristalo ndi m'mphepete mwake ndi yosiyana, kotero kuti kupanikizika kwa kristalo pamphepete kumawonjezeka, ndipo m'mphepete mwa kristalo n'zosavuta kutulutsa "chilema chonse" chifukwa cha mphamvu ya mphete ya graphite "carbon", momwe mungathetsere vuto la m'mphepete mwa kristalo kapena kuonjezera chigawo chofunika kwambiri cha 5% (chofunika kwambiri)

Monga zolakwika zazikulu monga "microtubules" ndi "inclusions" zimayendetsedwa pang'onopang'ono ndi makampani, kutsutsa makristasi a silicon carbide kuti "akule mofulumira, motalika komanso mozama, ndikukula", m'mphepete mwa "zilema zonse" zimakhala zodziwika bwino, ndipo kuwonjezeka kwa m'mimba mwake ndi makulidwe a silicon carbide crystals "mawonekedwe" adzakhala "makristali ambiri" omwe amapangidwa ndi makristasi ambiri. makulidwe.

Kugwiritsa ntchito tantalum carbide TaC ❖ kuyanika ndi kuthetsa vuto la m'mphepete ndikuwongolera kukula kwa kristalo, yomwe ndi imodzi mwamaupangiri aukadaulo a "kukula mwachangu, kukula kolimba komanso kukula". Pofuna kulimbikitsa chitukuko cha luso makampani ndi kuthetsa "kuitanitsa" kudalira zipangizo zofunika, Hengpu yapambana anathetsa tantalum carbide ❖ kuyanika luso (CVD) ndipo anafika mlingo mayiko apamwamba.

Tantalum carbide TaC ❖ kuyanika, kuchokera mmene kuzindikira si kovuta, ndi sintering, CVD ndi njira zina n'zosavuta kukwaniritsa. Sintering njira, ntchito tantalum carbide ufa kapena kalambulabwalo, kuwonjezera yogwira zosakaniza (nthawi zambiri zitsulo) ndi kugwirizana wothandizira (zambiri unyolo polima), TACHIMATA pamwamba pa graphite gawo lapansi sintered pa kutentha. Mwa njira ya CVD, TaCl5+H2+CH4 idayikidwa pamwamba pa matrix a graphite pa 900-1500 ℃.

Komabe, magawo oyambira monga kristalo wa tantalum carbide deposition, makulidwe a filimu yofananira, kutulutsa kupsinjika pakati pa zokutira ndi ma graphite matrix, ming'alu yapamtunda, ndi zina zambiri, ndizovuta kwambiri. Makamaka mu chilengedwe cha kukula kwa sic crystal, moyo wokhazikika wautumiki ndi gawo lalikulu, ndilovuta kwambiri.