Ukusebenza kwe-White Fused Alumina ku-Investment Casting
1. Izinto Zokutshala Imali Zokuphonsa Igobolondo
I-alumina emhlophe ehlanganisiwekukhiqizwa ngokuxuba i-alumina yezimboni esezingeni eliphezulu emazingeni okushisa angaphezu kuka-2000°C. Inikeza ubumsulwa obungavamile (α-Al₂O₃okuqukethwe > 99–99.6%) kanye nokungaguquguquki okuphezulu kuka-2050°C–2100°C, ene-coefficient yokukhulisa ukushisa ephansi (cishe 8)×10⁻⁶/°C). Lezi zakhiwo ziyenza ibe yindlela enhle kakhulu kunesihlabathi se-zircon sendabuko njengento eyinhloko yegobolondo lokufaka imali. Ukufana kwayo okuphezulu kwezinhlayiya (ukusatshalaliswa kosayizi wezinhlamvu > 95%) kanye nokusabalala okuhle kusiza ekudaleni isikhunta esiqinile nesiqinile, okuthuthukisa kakhulu ukuqeda kobuso bokufaka kanye nokunemba kobukhulu ngenkathi kunciphisa amazinga okukhubazeka.
2. Ukuqinisa Isikhunta
Ngobunzima be-Mohs obungu-9.0 kanye nokugcinwa kwamandla okushisa okuphezulu okuhle kakhulu (ukugcina ubuqotho ngaphezu kuka-1900°C),i-alumina emhlophe ehlanganisiweyandisa impilo yenkonzo yesikhunta ngo-30–50%. Uma isetshenziswa ezikhumbeni noma ema-cores ensimbi ephonswe, insimbi ephonswe, noma ama-alloy angewona awe-ferrous, imelana ngempumelelo nokuguguleka kokugeleza kwensimbi futhi inciphise imvamisa yokulungiswa nokugcinwa.
Izinzuzo ze-White Fused Alumina
(1) Ukuzinza Kwezinga Lokushisa Eliphezulu
I-alumina emhlophe ehlanganisiweinikeza ukuzinza okuvelele kwe-thermochemical ngesikhathi sokusebenza kokubumba. I-coefficient yayo yokwandisa ukushisa cishe ingxenye eyodwa kwezintathu kuneyezinto ezivamile, okusiza ukuvimbela ukuqhekeka kwesikhunta noma ukuguqulwa kokubumba ngenxa yokushintsha kwezinga lokushisa okungazelelwe. Ukuvela kwayo kwegesi ephansi (ukukhishwa kwegesi <3) ml/g) kunciphisa ukubhoboka kanye nokukhubazeka kwembobo yomoya.
(2) Ikhwalithi Yokuqedela Okungaphezulu
Uma isetshenziswa njengempuphu yokupholisha encane (usayizi wokusanhlamvu 0.5–45μm),i-alumina emhlophe ehlanganisiweinikeza ukuklwebheka okulinganayo, okungafinyelela ubulukhuni bokuphonsa ubuso obungu-Ra < 0.8μm. Ukuzilola kwayo (izinga lokuphuka < 5%) kuqinisekisa ukusebenza kahle kokusika okuqhubekayo kanye nemiphumela yokupholisha ezinzile.
(3) Ukuzivumelanisa Nenqubo
Sinikeza osayizi bokusanhlamvu obulungisekayo obusukela ku-F12 kuya ku-F10000 ukuze kuhambisane nezinqubo ezahlukahlukene zokuphonsa:
Amabanga amabi (F12)–F100): Ukukhululwa kwesikhunta ezakhiweni eziyinkimbinkimbi, okwandisa amazinga empumelelo okunciphisa ukwakheka ngamaphesenti angaphezu kuka-25.
Amamaki amahle (F220)–F1000): Ukukhiqiza ama-core e-ceramic anembile kakhulu anezimo eziqinile njenge-tolerances±0.1 mm.
3. Inani Lokuthuthukisa Inqubo
(1) Ukusetshenziswa Kahle Kwezindleko
Ukufaka isihlabathi se-zircon esikhundlenii-alumina emhlophe ehlanganisiwe kunganciphisa izindleko zezinto zokwakha ngo-30–40%. Iphinde ivumele ukujiya kwegobolondo ukuthi kuncishiswe ngo-15–20% (ubukhulu obujwayelekile begobolondo: 0.8–1.2 mm), okunciphisa umjikelezo wokwakha igobolondo.
(2) Izinzuzo Zemvelo
Ngokuqukethwe kwensimbi esindayo okuphansi kakhulu (< 0.01%), i-alumina emhlophe ehlanganisiwe ihlangabezana nezindinganiso zemvelo ze-ISO 14001. Isihlabathi esilahliwe singaphinde sisetshenziswe ngo-100% futhi singasetshenziswa kabusha ekukhiqizeni okungenakunyakaziswa.
Izicelo Ezifakazelwe
Lokhu okubalulekile kuye kwasetshenziswa kabanzi emikhakheni esezingeni eliphezulu njengezinsimbi ze-aerospace turbine kanye nokufakwa kwemishini yokwelapha ngokunemba. Amacala ajwayelekile abonisa ukuthi kungakhuphula amazinga okuphasa komkhiqizo kusuka ku-85% kuya ku-97%.