Ukusebenza kwe-White Fused Alumina ku-Investment Casting
1. Investment Casting Shell Material
I-alumina ehlanganisiwe emhlopheikhiqizwa ngokuhlanganisa i-alumina yezimboni esezingeni eliphezulu emazingeni okushisa angaphezu kuka-2000°C. Inikeza ubumsulwa obukhethekile (α-Al₂O₃okuqukethwe > 99-99.6%) kanye ne-refractoriness ephezulu ka-2050°C-2100°C, ene-coefficient ephansi yokunwetshwa kwe-thermal (cishe 8×10⁻⁶/°C). Lezi zakhiwo zenza kube enye indlela enhle kakhulu yesihlabathi se-zircon yendabuko njengempahla yegobolondo eyinhloko yokusakazwa kokutshalwa kwezimali. Ukufana kwayo okuphezulu kwezinhlayiyana (usayizi wokudla okusanhlamvu> 95%) nokuhlakazeka okuhle kusiza ekudaleni isikhunta esiminyene, esiqine kakhulu, sithuthukise ngokuphawulekayo isiphetho sendawo yokuphonsa kanye nokunemba kobukhulu kuyilapho kunciphisa izinga lokukhubazeka.
2. Ukuqiniswa Kwesikhunta
Ngobunzima be-Mohs obungu-9.0 kanye nokugcina amandla okuhle kakhulu ezinga lokushisa eliphezulu (ukugcina ubuqotho ngaphezu kuka-1900°C),i-alumina emhlophe ehlanganisiweinweba impilo yesevisi yesikhunta ngama-30-50%. Uma isetshenziselwa isikhunta noma ama-cores ensimbi ekhonjiwe, insimbi ekhonjiwe, noma ama-alloys angenayo i-ferrous, imelana ngokuphumelelayo nokuguguleka kokugeleza kwensimbi futhi inciphisa imvamisa yokulungiswa nokugcinwa.
Izinzuzo ze-White Fused Alumina
(1) Ukuzinza Kwezinga Lokushisa Okuphezulu
I-alumina ehlanganisiwe emhlopheinikeza ukuzinza okuvelele kwe-thermochemical ngesikhathi sokusebenza kokusakazwa. I-coefficient yayo yokwandisa okushisayo imayelana nengxenye eyodwa kwezintathu yezinto ezivamile, okusiza ukuvimbela ukuqhekeka kwesikhunta noma ukuguqulwa kokukhishwa ngenxa yezinguquko ezisheshayo zokushisa. Ukuvela kwayo kwegesi okuphansi (ukukhululwa kwegesi <3 ml/g) inciphisa i-porosity kanye nokukhubazeka kwe-blowhole.
(2) Ikhwalithi Yokuqeda Ubuso
Uma isetshenziswa njengempushana yokupholisha kahle (usayizi wokusanhlamvu 0.5-45μm),i-alumina emhlophe ehlanganisiweiletha okungaguquguquki, ngisho nokuhuzuka okungafinyelela ubulukhuni bokuphonsa be-Ra <0.8μm. Imvelo yayo yokuzilola (izinga lokuphuka <5%) liqinisekisa ukusebenza kahle kokusika kanye nemiphumela yokupholisha ezinzile.
(3) Ukuzivumelanisa nezimo
Sinikeza osayizi bokusanhlamvu abalungisekayo ukusuka ku-F12 kuye ku-F10000 ukuze bavumelane nezinqubo ezihlukahlukene zokulingisa:
Amabanga amaholo (F12-F100): Ukuze kukhishwe isikhunta ezakhiweni eziyinkimbinkimbi, kukhuphula amazinga empumelelo yokudiliza ngaphezulu kwama-25%.
Amabanga amahle (F220-F1000): Ukuze kukhiqizwe ama-ceramic cores anembe kakhulu anokubekezelela okuqinile njengokuqinile±0.1 mm.
3. Inani Lokuthuthukisa Inqubo
(1) Ukusebenza Kwezindleko
Ukushintsha isihlabathi se-zircon ngei-alumina emhlophe ehlanganisiwe inganciphisa izindleko zempahla ngo-30-40%. Iphinde ivumele ubukhulu begobolondo ukuthi bunciphe ngo-15-20% (ukujiya kwegobolondo okujwayelekile: 0.8-1.2 mm), ukunciphisa umjikelezo wokwakha amagobolondo.
(2) Izinzuzo Zemvelo
Ngokuqukethwe kwensimbi esindayo ephansi kakhulu (< 0.01%), i-alumina emhlophe ehlanganisiwe ihlangabezana namazinga emvelo e-ISO 14001. Isihlabathi semfucuza singasebenza kabusha ngo-100% futhi singasetshenziswa kabusha ekukhiqizeni okuphikisayo.
Izinhlelo zokusebenza ezifakazelwe
Lokhu okubalulekile kwamukelwe kabanzi emikhakheni esezingeni eliphezulu njengamaladi e-aerospace turbine kanye nokusakazwa ngokunemba kwedivayisi yezokwelapha. Izigameko ezijwayelekile zikhombisa ukuthi inganyusa izinga lokuphasa komkhiqizo ukusuka ku-85% ukuya ku-97%.