Zaɓar Maƙallin Graphite Mai Dacewa Don Girman Crystal: Jagora Mai Amfani

A duniyargirma na lu'ulu'u—ko dai don SiC, GaN, sapphire, ko wasu kayan aiki na zamani—maƙallin graphite ba wai kawai akwati bane. Iyakar zafi ce, hanyar haɗin amsawa, da kuma mai tsaron ƙofa don tsarki. Zaɓar maƙallin da ya dace na iya yin tasiri sosai ga yawan amfanin ƙasa, ingancin lu'ulu'u, da kuma kwanciyar hankali a cikin tanda.

Wannan jagorar tana taimaka wa injiniyoyin sarrafawa, ƙungiyoyin bincike da ci gaba, da manajojin sayayya su bi manyan abubuwan da ke haifar da zaɓen graphite don haɓaka lu'ulu'u mai zafi.

Dalilin da yasa Graphite Crucibles suke matsayin Ma'aunin Masana'antu

Ana amfani da graphite sosai wajen haɓaka lu'ulu'u saboda:

• Babban ƙarfin lantarki na thermal da rarrabawar zafi iri ɗaya

• Kyakkyawan juriya ga girgizar thermal, musamman a cikin hawan keke mai yawan zafin jiki

• Keɓancewa don tsarin lissafi mai rikitarwa da haɗawa tare da tsarin da aka rufe (misali, murfin SiC ko TaC)

• Farashi mai rahusa idan aka kwatanta da yumbu na ƙarfe ko ƙarfe mai tsauri

Amma ba cikakke ba ne. Graphite na iya amsawa da iskar gas mai kewaye, yana rage zafi a yanayin zafi mai yawa, kuma yana fitar da ƙazanta idan ba a tsaftace shi yadda ya kamata ba ko kuma an shafa shi da kyau.(1)

Muhimman Abubuwan Da Ake Tunani Da Su Lokacin Zaɓar Crucible

1. Yanayin Zafin Jiki & Kwanciyar Hankali

• Graphite na yau da kullun zai iya jurewa har zuwa ~2000°C, amma don haɓakar sublimation na SiC (>2200°C), tarkacen da aka rufe (misali, TaC, SiC) suna da mahimmanci.
• Ga tsawon zagayowar girma, kwanciyar hankali da juriya ga rarrafe suna da mahimmanci.

2. Daidaita Kayan Aiki

• Shin tsarin ya ƙunshi Si, C, halogens, ko hydrogen? Kowannensu na iya kai hari ga graphite ta hanyoyi daban-daban.
• Tsarin da aka yi amfani da shi ta hanyar Si sau da yawa yana amfana daga rufin SiC don hana gurɓatawa da tsatsa.

3. Tsarkakewa & Kula da Gurɓatawa

• Graphite mai tsarki (>99.99%) abu ne da ake buƙata don amfani da na'urorin lantarki masu amfani da wutar lantarki da kuma na'urorin semiconductor.
• Yi la'akari da tarkacen da aka rufe lokacin da ƙaura ta abu (misali, B, Al, Fe) na iya lalata ingancin lu'ulu'u.

4. Nau'in Shafi

• Shafi na SiC: Ya zama ruwan dare ga ci gaban lu'ulu'u na SiC; daidaiton zafi mai kyau, wanda ba ya aiki a sinadarai
• Rufin TaC: Don yanayin zafi mai yawa; yana ba da ingantaccen shingen tsatsa da yaɗuwa
• Rufin Haɗaɗɗiya: Magani na musamman don takamaiman halayen lokaci-lokaci na iskar gas

5.Haɗakar Bayanan Zafi & Tanderu

• Tsarin Crucible yana shafar daidaiton zafin jiki da kwanciyar hankali na yankin girma.
• Inganta ƙirar crucible bisa ga kwaikwayon yankin zafi da ƙirar CFD.

Matsalolin da Ya Kamata a Guji

• Amfani da graphite mara rufi a cikin yanayi mai tsauri: Rushewa cikin sauri, gurɓatawa, da kuma rashin iya maimaitawa.

• Rage kauri ko daidaiton shafi: Sirara ko rashin daidaituwar shafi yana haifar da gazawar da wuri.

• Yin watsi da rashin daidaiton faɗaɗa zafi: Fashewa ko wargajewa a cikin dogon zagaye saboda rashin daidaiton shafi/tushe.

Nasihu kan Kulawa da Tsawon Rai

• A gasa gwangwani kafin a fara amfani da su domin rage fitar da hayaki.

• A riƙa duba ingancin shafa bayan kowace aiki, musamman gefuna da kusurwoyi.

• Bibiyar ƙidayar zagayowar ruwa da tsarin lalacewa—ba duk gazawar da ake gani a waje ba.

Shawarwari Kan Takamaiman Aikace-aikace