Ukusebenza kwe-White Fused Alumina kwi-Investment Casting
1. Izinto zeShell zokuphosa utyalo-mali
I-alumina emhlophe exutyiweyoiveliswa ngokudibanisa i-alumina yemizi-mveliso ekumgangatho ophezulu kumaqondo obushushu angaphezu kwama-2000°C. Inika ubunyulu obugqwesileyo (α-Al₂O₃umxholo > 99–99.6%) kunye nokuchasana okuphezulu kowama-2050°C–2100°C, ene-coefficient yokwandisa ubushushu ephantsi (malunga ne-8)×10⁻⁶/°C). Ezi mpawu ziyenza ibe lolunye uhlobo oluhle kunesanti ye-zircon yendabuko njengesixhobo esiphambili seqokobhe lotyalo-mali. Ukufana kwayo okuphezulu kwamasuntswana (ukusasazwa kobungakanani bengqolowa > 95%) kunye nokusasazeka okuhle kunceda ekudaleni iimold ezixineneyo neziqinileyo, ziphucula kakhulu ukugqitywa komphezulu wokubumba kunye nokuchaneka kobukhulu ngelixa kunciphisa amazinga eziphene.
2. Ukuqinisa uMbundu
Ngobunzima be-Mohs obuyi-9.0 kunye nokugcinwa kwamandla aphezulu kubushushu obuphezulu (ukugcina ukuthembeka kungaphezulu kwe-1900°C),i-alumina emhlophe exutyiweyoyandisa ubomi benkonzo yokubumba nge-30–50%. Xa isetyenziswa kwiimolds okanye kwiicores zesinyithi esityhidiweyo, isinyithi esityhidiweyo, okanye ii-alloys ezingezizo iintsimbi, iyamelana ngempumelelo nokukhukuliseka kokuhamba kwesinyithi kwaye inciphise amaxesha okulungiswa nokugcinwa.
Iingenelo zeWhite Fused Alumina
(1) Uzinzo lobushushu obuphezulu
I-alumina emhlophe exutyiweyoinika uzinzo olubalaseleyo lwe-thermochemical ngexesha lokusebenza kwe-cast. I-coefficient yayo yokwandisa ubushushu imalunga nesinye kwisithathu sezinto eziqhelekileyo, inceda ekuthinteleni ukuqhekeka kwesikhunta okanye ukuguqulwa kwe-cast ngenxa yotshintsho olukhawulezileyo lobushushu. Ukuguquka kwayo kwegesi ephantsi (ukukhululwa kwegesi <3) ml/g) inciphisa ukuvuleka kunye neziphene zomngxuma womoya.
(2) Umgangatho wokugqiba umphezulu
Xa isetyenziswa njengomgubo ocolekileyo wokupolisha (ubukhulu beenkozo yi-0.5–45μm),i-alumina emhlophe exutyiweyoinika ukurhawuzelelwa okulinganayo, okunokufezekisa uburhabaxa bomphezulu we-casting we-Ra < 0.8μm. Indalo yayo yokuzilola (izinga lokuqhekeka < 5%) iqinisekisa ukusebenza kakuhle kokusika kunye neziphumo zokupholisha ezizinzileyo.
(3) Ukulungelelaniswa kweNkqubo
Sinikezela ngobukhulu beenkozo ezihlengahlengiswayo ukusuka kwi-F12 ukuya kwi-F10000 ukuze zilungele iinkqubo ezahlukeneyo zokuphosa:
Amanqanaba aqinileyo (F12)–F100): Ukukhupha isikhunta kwizakhiwo ezintsonkothileyo, kunyusa amazinga empumelelo okunciphisa umonakalo ngaphezulu kwe-25%.
Amanqaku amahle (F220)–F1000): Yenzelwe ukuvelisa ii-cores ze-ceramic ezichanekileyo kakhulu kunye nokumelana kokwenza okuqinileyo njenge±0.1 mm.
3. Ixabiso lokuphucula inkqubo
(1) Ukonga iindleko
Ukutshintsha isanti ye-zircon ngei-alumina emhlophe exutyiweyo inganciphisa iindleko zezinto zokwakha ngama-30–Ikwavumela ukuba ubukhulu beqokobhe buncitshiswe nge-15%.–20% (ubukhulu beqokobhe eliqhelekileyo: 0.8–1.2 mm), nto leyo efinyeza umjikelo wokwakha iqokobhe.
(2) Iingenelo zokusingqongileyo
Ngomxholo wesinyithi esinzima ophantsi kakhulu (< 0.01%), i-alumina emhlophe exutyiweyo ihlangabezana nemigangatho yokusingqongileyo ye-ISO 14001. Isanti yenkunkuma inokuphinda isetyenziswe nge-100% kwaye inokusetyenziswa kwakhona kwimveliso enganyangekiyo.
Izicelo eziQinisekisiweyo
Le nto isetyenziswa kakhulu kwiindawo eziphezulu ezifana neebhlade ze-turbine ze-aerospace kunye nee-castings ezichanekileyo zezixhobo zonyango. Amatyala aqhelekileyo abonisa ukuba inokunyusa amazinga okupasa imveliso ukusuka kwi-85% ukuya kwi-97%.