Zinthu zofunika kwambiri pakukula kwa sic

Pamene kristalo ya silicon carbide ikukula, "chilengedwe" cha malo olumikizirana kukula pakati pa pakati pa kristalo ndi m'mphepete chimakhala chosiyana, kotero kuti kupsinjika kwa kristalo m'mphepete kumawonjezeka, ndipo m'mphepete mwa kristalo kumakhala kosavuta kupanga "zolakwika zonse" chifukwa cha mphamvu ya mphete yoyimitsa ya graphite "carbon", momwe mungathetsere vuto la m'mphepete kapena kuwonjezera malo ogwira ntchito pakati (oposa 95%) ndi nkhani yofunika kwambiri yaukadaulo.

Pamene zolakwika zazikulu monga "microtubules" ndi "inclusions" zikuwongoleredwa pang'onopang'ono ndi makampani, zomwe zimapangitsa kuti ma crystals a silicon carbide "akule mwachangu, motalika komanso mokhuthala, ndikukula", "zofooka zambiri" za m'mphepete zimaonekera kwambiri, ndipo chifukwa cha kuwonjezeka kwa kukula ndi makulidwe a ma crystals a silicon carbide, "zofooka zambiri" za m'mphepete zidzachulukitsidwa ndi kukula kwa sikweya ndi makulidwe.

Kugwiritsa ntchito utoto wa TaC wa tantalum carbide ndiko kuthetsa vuto la m'mphepete mwa nyanja ndikukweza kukula kwa kristalo, komwe ndi njira imodzi yofunika kwambiri yopezera "kukula mwachangu, kukula kwambiri komanso kukula". Pofuna kulimbikitsa chitukuko cha ukadaulo wamakampani ndikuthetsa kudalira "kutumiza" kwa zinthu zofunika, Hengpu yapanga njira yatsopano yothetsera ukadaulo wa tantalum carbide coating (CVD) ndipo yafika pamlingo wapamwamba wapadziko lonse lapansi.

Kuphimba kwa Tantalum carbide TaC, kuchokera pakuwona kwa kuzindikira sikovuta, ndi sintering, CVD ndi njira zina ndizosavuta kukwaniritsa. Njira yopangira sintering, kugwiritsa ntchito ufa wa tantalum carbide kapena precursor, kuwonjezera zosakaniza zogwira ntchito (nthawi zambiri chitsulo) ndi wothandizira womangirira (nthawi zambiri unyolo wautali wa polima), wokutidwa pamwamba pa graphite substrate yotenthedwa kutentha kwambiri. Pogwiritsa ntchito njira ya CVD, TaCl5+H2+CH4 idayikidwa pamwamba pa graphite matrix pa 900-1500℃.

Komabe, magawo oyambira monga kuyang'ana kwa kristalo ya tantalum carbide deposition, makulidwe ofanana a filimu, kutulutsidwa kwa kupsinjika pakati pa zokutira ndi graphite matrix, ming'alu ya pamwamba, ndi zina zotero, ndizovuta kwambiri. Makamaka m'malo okulira a kristalo, moyo wokhazikika wautumiki ndiye gawo lofunikira, ndipo ndilovuta kwambiri.