Lapho ikristalu ye-silicon carbide ikhula, "indawo" yokuxhumana kokukhula phakathi kwesikhungo se-axial sekristalu kanye nomphetho ihlukile, ukuze ukucindezeleka kwekristalu onqenqemeni kukhuphuke, futhi umphetho wekristalu kulula ukukhiqiza "amaphutha aphelele" ngenxa yethonya lendandatho yokuma ye-graphite "carbon", indlela yokuxazulula inkinga yomphetho noma ukwandisa indawo ephumelelayo yesikhungo (ngaphezu kuka-95%) kuyisihloko esibalulekile sobuchwepheshe.
Njengoba amaphutha amakhulu njenge-“microtubules” kanye “nokufakiwe” elawulwa kancane kancane yimboni, ephonsela inselelo amakristalu e-silicon carbide ukuba “akhule ngokushesha, amade futhi abe makhulu, futhi akhule”, “amaphutha aphelele” asemaphethelweni abonakala ngendlela engavamile, futhi ngokwanda kobubanzi nobukhulu bamakristalu e-silicon carbide, “amaphutha aphelele” emaphethelweni azophindaphindwa ngesikwele nobukhulu bobubanzi.
Ukusetshenziswa kwe-tantalum carbide TaC coating ukuxazulula inkinga yomphetho nokuthuthukisa ikhwalithi yokukhula kwekristalu, okungenye yezindlela zobuchwepheshe eziyinhloko "zokukhula ngokushesha, ukukhula kube kukhulu futhi kukhule". Ukuze kukhuthazwe intuthuko yobuchwepheshe bemboni nokuxazulula ukuncika "kokungenisa" kwezinto ezibalulekile, iHengpu iphumelele ekuxazululeni ubuchwepheshe be-tantalum carbide coating (CVD) futhi yafinyelela ezingeni eliphambili lomhlaba wonke.
Ukumbozwa kwe-Tantalum carbide TaC, ngokombono wokwenziwa akunzima, ngokusinta, i-CVD nezinye izindlela kulula ukuzifeza. Indlela yokusinta, ukusetshenziswa kwe-tantalum carbide powder noma i-precursor, ukwengeza izithako ezisebenzayo (ngokuvamile insimbi) kanye ne-bonding agent (ngokuvamile i-polymer yeketanga elide), embozwe ebusweni be-graphite substrate esinta ekushiseni okuphezulu. Ngokwendlela ye-CVD, i-TaCl5+H2+CH4 yafakwa ebusweni be-graphite matrix ku-900-1500℃.
Kodwa-ke, amapharamitha ayisisekelo njengokuqondiswa kwekristalu kokufakwa kwe-tantalum carbide, ukujiya kwefilimu efanayo, ukukhululwa kokucindezeleka phakathi kokumboza kanye ne-graphite matrix, imifantu engaphezulu, njll., kuyinselele kakhulu. Ikakhulukazi endaweni yokukhula kwekristalu, impilo yesevisi ezinzile iyipharamitha eyinhloko, iyona enzima kakhulu.
Isikhathi sokuthunyelwe: Julayi-21-2023