Inqubo yokukhiqiza i-reactive sintering silicon carbide

I-silicon carbide e-Reaction-sintered iyinto ebalulekile eshisa kakhulu, enamandla aphezulu, ubulukhuni obuphezulu, ukumelana nokuguguleka okuphezulu, ukumelana nokugqwala okuphezulu kanye nokumelana nokugqwala okuphezulu kanye nezinye izakhiwo ezinhle kakhulu, isetshenziswa kabanzi emishinini, ezindizayo, embonini yamakhemikhali, emandleni nakweminye imikhakha.

 

1. Ukulungiswa kwezinto ezingavuthiwe

Ukulungiswa kwezinto zokusetshenziswa ze-reactive sintering silicon carbide ikakhulukazi yi-carbon kanye ne-silicon powder, lapho i-carbon ingasetshenziswa khona izinto ezihlukahlukene eziqukethe i-carbon, njenge-coaster coke, i-graphite, amalahle, njll., i-silicon powder ivame ukukhethwa ngosayizi wezinhlayiya ongu-1-5μm high purity silicon powder. Okokuqala, i-carbon kanye ne-silicon powder zixutshwa ngesilinganiso esithile, kufakwe inani elifanele le-binder kanye ne-flow agent, bese kuhlanganiswa ngokulinganayo. Ingxube ibe isifakwa emshinini wokugaya ibhola ukuze kugaywe ibhola ukuze kuqhutshekwe kuxutshwa futhi kugaywe ngendlela efanayo kuze kube yilapho usayizi wezinhlayiya ungaphansi kuka-1μm.

2. Inqubo yokubumba

Inqubo yokubumba ingenye yezinyathelo ezibalulekile ekukhiqizweni kwe-silicon carbide. Izinqubo zokubumba ezisetshenziswa kakhulu ukubumba ngokucindezela, ukubumba nge-grouting kanye nokubumba nge-static. Ukwakha nge-press kusho ukuthi ingxube ifakwa esikhumbeni futhi yakhiwe ngokucindezela komshini. Ukubunjwa nge-grouting kubhekisela ekuxubeni ingxube namanzi noma i-organic solvent, ukuyifaka esikhumbeni ngesirinji ngaphansi kwezimo ze-vacuum, bese kwakheka umkhiqizo oqediwe ngemva kokuma. Ukubunjwa nge-static pressure kubhekisela engxubeni esikhumbeni, ngaphansi kokuvikelwa kwe-vacuum noma umoya wokubumba nge-static pressure, ngokuvamile ngokucindezela okungu-20-30MPa.

3. Inqubo yokuhlanza

Ukusinta kuyisinyathelo esibalulekile enkambisweni yokukhiqiza i-carbide ye-silicon ehlanganisiwe esabelayo. Izinga lokushisa lokusinta, isikhathi sokusinta, umoya wokusinta kanye nezinye izici kuzothinta ukusebenza kwe-carbide ye-silicon ehlanganisiwe esabelayo. Ngokuvamile, izinga lokushisa lokusinta le-carbide ye-silicon ehlanganisiwe esabelayo liphakathi kuka-2000-2400℃, isikhathi sokusinta ngokuvamile singamahora angu-1-3, kanti umoya wokusinta uvame ukungangeni, njenge-argon, i-nitrogen, njalo njalo. Ngesikhathi sokusinta, ingxube izobhekana nokusabela kwamakhemikhali ukuze yakhe amakristalu e-silicon carbide. Ngesikhathi esifanayo, ikhabhoni izophinde isabelane namagesi asemkhathini ukuze ikhiqize amagesi afana ne-CO2 ne-CO2, okuzothinta ubuningi kanye nezakhiwo ze-carbide ye-silicon. Ngakho-ke, ukugcina umoya wokusinta ofanele kanye nesikhathi sokusinta kubaluleke kakhulu ekwakhiweni kwe-carbide ye-silicon ehlanganisiwe esabelayo.

4. Inqubo yangemva kokwelashwa

I-silicon carbide e-reaction-sintered idinga inqubo yangemva kokwelashwa ngemva kokukhiqizwa. Izinqubo ezivamile zangemva kokwelashwa yi-machining, grinding, polishing, oxidation njalo njalo. Lezi zinqubo zenzelwe ukuthuthukisa ukunemba kanye nekhwalithi yobuso be-silicon carbide e-reaction-sintered. Phakathi kwazo, inqubo yokugaya nokupholisha iyindlela evamile yokucubungula, engathuthukisa ukuqeda kanye nokuba yisicaba kobuso be-silicon carbide. Inqubo ye-oxidation ingakha ungqimba lwe-oxide ukuze kuthuthukiswe ukumelana kwe-oxidation kanye nokuqina kwamakhemikhali kwe-silicon carbide e-reaction-sintered.

Ngamafuphi, ukukhiqizwa kwe-silicon carbide e-reactive sintering kuyinqubo eyinkimbinkimbi, isidingo sokuba yingcweti yobuchwepheshe nezinqubo ezahlukahlukene, okuhlanganisa ukulungiswa kwezinto zokusetshenziswa, inqubo yokubumba, inqubo yokucubungula kanye nenqubo yangemva kokwelashwa. Kuphela ngokuqonda kahle lobu buchwepheshe nezinqubo lapho izinto ze-silicon carbide ezifakwe i-reaction-sintered ezisezingeni eliphezulu zingakhiqizwa khona ukuze kuhlangatshezwane nezidingo zezinkambu ezahlukene zohlelo lokusebenza.