Ts'ebetso ea White Fused Alumina ho Investment Casting
1. Investment Casting Shell Material
Alumina e tšoeu e kopantsoenge hlahisoa ka ho kopanya alumina ea boleng bo holimo ea indasteri mochesong o kaholimo ho 2000°C. E fana ka bohloeki bo ikhethang (α-Al₂O₃litaba> 99-99.6%) le refractoriness e phahameng ea 2050°C-2100°C, e nang le coefficient e tlase ea katoloso ea mocheso (hoo e ka bang 8×10⁻⁶/°C). Thepa ena e e etsa sebaka se setle sa lehlabathe la zircon e le sesebelisoa sa mantlha sa ho etsa matsete. Ho tšoana ha likaroloana tsa eona tse phahameng (kabo ea boholo ba lijo-thollo> 95%) le khaso e ntle li thusa ho theha hlobo e teteaneng, e matla haholoanyane, ho ntlafatsa haholo bokaholimo ba bokaholimo le ho nepahala ha sebopeho ha ho ntse ho fokotsa sekhahla sa liphoso.
2. Matlafatso ea hlobo
Ka boima ba Mohs ba 9.0 le ho boloka matla a mocheso o phahameng haholo (ho boloka botšepehi ka holimo ho 1900°C),alumina e tshweu e bokelitsoengE eketsa bophelo ba ts'ebeletso ea hlobo ka 30-50%. Ha e sebelisoa ka har'a hlobo kapa li-cores bakeng sa tšepe e entsoeng ka tšepe, tšepe e entsoeng ka tšepe, kapa li-alloys tse se nang ferrous, e hanyetsa ka katleho khoholeho ea tšepe 'me e fokotsa khafetsa ea ho lokisoa le tlhokomelo.
Melemo ea White Fused Alumina
(1) Botsitso bo Phahameng ba Mocheso
Alumina e tšoeu e kopantsoenge fana ka botsitso bo ikhethang ba thermochemical nakong ea ts'ebetso ea ho lahla. Coefficient ea eona ea ho atolosa mocheso ke hoo e ka bang karolo ea boraro ea thepa e tloaelehileng, e thusang ho thibela ho phunyeha ha hlobo kapa ho lahla deformation ka lebaka la liphetoho tsa tšohanyetso tsa mocheso. Phetoho ea eona e tlase ea khase (ho lokolloa ha khase <3 ml/g) e fokotsa porosity le liphoso tsa ho phatloha.
(2) Boleng ba ho Qetella Bokaholimo
Ha e sebelisoa e le phofshoana e ntle ea ho bentša (saese ea lijo-thollo 0.5-45μm),alumina e tshweu e bokelitsoenge fana ka mokhoa o tsitsitseng, esita le abrasion e ka finyellang bokhopo ba Ra <0.8μm. Sebopeho sa eona sa ho itšeha (sekhahla sa ho robeha <5%) se tiisa katleho e tsitsitseng ea ho itšeha le liphello tse tsitsitseng tsa polishing.
(3) Ho ikamahanya le maemo
Re fana ka boholo bo feto-fetohang ba lijo-thollo ho tloha F12 ho isa F10000 ho lumellana le mekhoa e fapaneng ea ho lahlela:
Limaraka tse tlase (F12-F100): Bakeng sa ho lokolloa ha hlobo ka har'a meaho e rarahaneng, ho eketsa sekhahla sa katleho ea ho theola ka ho feta 25%.
Limaraka tse ntle (F220-F1000): Bakeng sa ho hlahisa li-cores tsa ceramic tse nepahetseng haholo tse nang le mamello e tiileng joalo ka±0.1 mm.
3. Boleng ba Ntlafatso ea Ts'ebetso
(1) Tšebeliso e Ntle ea Litšenyehelo
Ho fetola lehlabathe la zircon kaalumina e tshweu e bokelitsoeng e ka fokotsa litšenyehelo tsa thepa ka 30-40%. E boetse e nolofalletsa botenya ba khetla hore bo fokotsehe ka 15-20% (botenya bo tloaelehileng ba khetla: 0.8-1.2 mm), ho khutsufatsa potoloho ea ho aha likhetla.
(2) Melemo ea Tikoloho
Ka lisebelisoa tsa tšepe tse boima tse tlase haholo (<0.01%), alumina e tšoeu e kopantsoeng e kopana le litekanyetso tsa tikoloho tsa ISO 14001. Lehlabathe la litšila le ka sebelisoa hape ka 100% 'me le ka sebelisoa hape tlhahisong ea refractory.
Likopo tse netefalitsoeng
Boitsebiso bona bo amohetsoe ka ho pharaletseng libakeng tse phahameng tse kang li-blades tsa turbine ea aerospace le lisebelisoa tse nepahetseng tsa lisebelisoa tsa bongaka. Linyeoe tse tloaelehileng li bonts'a hore e ka eketsa litefiso tsa phallo ea sehlahisoa ho tloha ho 85% ho isa ho 97%.