Kungani Izitsha Zokubumba Ezimbozwe Nge-SiC Zinquma Ukukhiqizwa Okuqinile Kwesisindo?

Emigqeni yokukhiqiza ukukhula kwekristalu ye-SiC, onjiniyela abaningi bagxila ekwakhiweni kwe-hot-zone, ama-curve okulawula izinga lokushisa, kanye nokwakheka kwempuphu. Kodwa-ke lapho kuvela ukuguquguquka kwesivuno, imbangela eyinhloko ivame ukubuyela emuva entweni efanayo—i-crucible. Ayikhiphi ukukhanya, ayijikelezi, futhi ayibonakali “njengepharamitha eyinhloko” emidwebweni. Kodwa uma ungqimba luphuma ebusweni, ikristalu yakheka endaweni engafanele, noma ikhabhoni eningi kakhulu iphuma ekhoneni, amaphutha avelayo kulo lonke i-boule enza into eyodwa icace: le ngxenye ayiyona neze indima yokusekela.

Ukuba khona okwandayo kweIzitsha ze-graphite ezimbozwe yi-SiCEzithandweni zokukhula kwekristalu ze-semiconductor zinencazelo elula: izinga lokushisa, umkhathi, kanye nokuqina kokuthuthwa kwezinto endaweni yokukhula kucindezela imikhawulo yokusebenza kwezinto. I-Graphite inhle kakhulu maqondana nokumelana nokushisa, ukusebenza kahle, kanye nokudluliselwa kokushisa—kodwa iza nesimo sayo sobumnene: ukuguquguquka, ukungena kwamanzi, ukusabela kwamakhemikhali ngezinhlobo zomusi noma ukungcola, kanye nezingozi ezingenakugwenywa zokukhiqizwa kwempuphu kanye nezinhlayiya. Isembozo se-SiC sisebenza njengesivikelo esiqinile ngokumelene nalezi zindawo zobuhlungu.

Kungani Kufanele Usebenzise I-SiC Coating Ezitsheni Ezisebenzisa I-Graphite?

Izizathu ezintathu eziyinhloko:

1. Nciphisa ukuguquguquka kwekhabhoni kanye nokusabela kwayo

I-Graphite iqala ukuncibilika emazingeni okushisa aphezulu, ngisho nangaphansi kwegesi engasebenzi. I-carbon ekhishwe ishintsha i-chemistry yesigaba somusi ngesikhathi sokukhula kwe-PVT, iphazamisa ukuhamba kwe-deposition futhi ikhuthaze ukwakheka kwesici noma ukuqondiswa kokukhula okungazinzile.

2. Nciphisa imithombo yokungcola

Ngisho ne-graphite ecindezelwe ngokuzimela ene-high-purity ine-micro-pores kanye nokuthambekela okungokwemvelo kokumunca izinhlobo zezinto ezifana nezinto ezibangela umusi, imikhiqizo ephumayo, noma umswakama. Lokhu kungakhishwa kamuva ngesikhathi sokushisa okuphezulu, okuphazamisa ubumsulwa bekristalu. Isembozo se-SiC sivala i-pores futhi sithuthukise ukuhlanzeka kwemvelo.

3. Yandisa isikhathi sokuphila futhi unciphise ukusabalala

Ngemva kokugijima kaningi, izindawo ze-graphite zivame ukuwohloka: ukubola, ukuxebuka, ukuqhekeka okuncane, kanye nokulenga kwezinto. Lokhu kuholela ekungcoleni kwezinhlayiya kanye nokwehla kwesivuno. Ukwembozwa kwe-SiC okuqinile kungabambezela kakhulu izindlela ezinjalo zokwehluleka, kugcinwe ubuqotho bomphezulu kanye nokuthembeka.

Ukulawulwa Kwenqubo Yokumboza Kunquma Ukuthembeka Okuqinile

Indlela yokumboza eyinhloko yile I-CVD(Ukususwa Komhwamuko Wamakhemikhali) we-polycrystalline SiC. Ivuthiwe futhi izinzile ngokokushisa. Kodwa-ke, ukuba nesembozo akwanele—umehluko wangempela ekusebenzeni kwensimu uncike emininingwaneni emincane efana nalokhu:

● Ukufana kobukhulu bokumboza

Amajiyometri ayinkimbinkimbi okubethelwa kuwo—izinyathelo, imifantu, amafillet—adala izindawo ezinethunzi noma eziphansi lapho ukujiya koqweqwe kungawela khona ngaphansi kwesilinganiso. Lezi zindawo ezincane ziba ezokuqala ukuwohloka ngaphansi kokucindezeleka kokushisa.

Isixazululo:Umhlinzeki wengubo kumele abe nokulawula okuqondile kwensimu yokugeleza kwe-3D kanye nezinhlelo zokujikeleza eziguquguqukayo ukuqinisekisa ukumbozwa okufanayo ngisho nasezintweni eziyinkimbinkimbi.

● Ubuningi bengubo kanye nokususwa kwembobo yephini

Uma amapharamitha e-CVD (ama-gradient okushisa, izilinganiso zegesi, isikhathi sokuhlala) engalawulwa kahle, kungase kwakheke ama-pinhole amancane. Lawa aba amaphuzu okuqala ukwehluleka njengoba i-carbon iphuma futhi kwenzeka ukugqwala kwendawo.

Ukutholwa:Ubukhulu obuyisisekelo kanye nokuhlolwa okubonakalayo akwanele. Sebenzisa izivivinyo zokuvuza kwe-helium noma ukuhlolwa kokunciphisa isisindo okusele emijikelezweni eminingi yokushisa ukuze uthole ukugoba okufihliwe.

● Amandla okunamathela kanye nokumelana nokucindezeleka kokushisa

I-SiC kanye ne-graphite zinama-coefficient ahlukene okwandisa ukushisa. Uma ukucindezeleka okusele embozweni kungancishiswa, noma ukugoba/ukulungiswa kwendawo kunganele, ukuhlukanisa kungase kwenzeke ngesikhathi sokujikeleza kokushisa.

Imikhuba emihle kakhulu:Qinisekisa ukuqhuma kwe-grit kanye nokuhlanzwa kwe-ultrasonic ngaphambi kokumboza, bese uqinisekisa ukuqina kokucindezeleka kokushisa ngokujikeleza kwesithando sangempela.

Izindlela Zokwehluleka Ezivamile kanye Nomthelela Wazo Wekristalu

Ekukhiqizeni, uma i-crucible yehluleka, umthelela ophumelayo ngokuvamile awugcini nje ngokuba yi-ppm embalwa, kodwa ukulahlekelwa yi-batch ephelele kanye nokuphazamiseka kwamandla amasonto amaningi. Lokhu akuyona nje inkinga ebalulekile—kuyinkinga yokuzinza kohlelo.