Kuchita kwa White Fused Alumina mu Investment Casting
1. Investment Casting Shell Material
Aluminiyamu wosakanikirana woyeraamapangidwa ndi kusakaniza aluminiyamu yapamwamba yamafakitale pa kutentha pamwamba pa 2000°C. Limapereka chiyero chapadera (α-Al₂O₃zomwe zili > 99-99.6%) ndi kukana kwakukulu kwa 2050°C-2100°C, yokhala ndi chiwonjezeko chochepa cha kutentha (pafupifupi 8×10⁻⁶/°C). Izi zimapangitsa kukhala njira yabwino kwambiri yosinthira mchenga wa zircon wachikhalidwe ngati chipolopolo choyambirira chopangira ndalama. Kufanana kwake kwa tinthu tating'onoting'ono (kukula kwa tirigu> 95%) ndi kubalalitsidwa kwabwino kumathandizira kupanga zisankho zolimba, zolimba, kuwongolera kwambiri kumalizidwa kwapamwamba komanso kulondola kwa mawonekedwe ndikuchepetsa ziwopsezo.
2. Kulimbitsa Nkhungu
Ndi kuuma kwa Mohs kwa 9.0 komanso kusungirako mphamvu zotentha kwambiri (kusunga umphumphu pamwamba pa 1900°C),aluminiyamu wonyezimira woyerakumawonjezera moyo wautumiki wa nkhungu ndi 30-50%. Ikagwiritsidwa ntchito mu nkhungu kapena ma cores pazitsulo zotayidwa, zitsulo zotayidwa, kapena zosakaniza zopanda chitsulo, zimalimbana bwino ndi kukokoloka kwachitsulo ndikuchepetsa kukonzanso ndi kukonza pafupipafupi.
Ubwino wa White Fused Alumina
(1) Kukhazikika kwa Kutentha Kwambiri
Aluminiyamu wosakanikirana woyeraimapereka kukhazikika kwapadera kwa thermochemical panthawi yoponya. Matenthedwe ake owonjezera mphamvu ndi pafupifupi gawo limodzi mwa magawo atatu a zipangizo ochiritsira, kuthandiza kuteteza nkhungu kusweka kapena kuponyera deformation chifukwa cha kusintha mwadzidzidzi kutentha. Kutsika kwake kwa gasi (kutulutsa gasi <3 ml/g) amachepetsa porosity ndi zopumira.
(2) Pamwamba Kumaliza Quality
Mukagwiritsidwa ntchito ngati ufa wopukutira bwino (kukula kwa tirigu 0,5-45μm),aluminiyamu wonyezimira woyeraamapereka mosasinthasintha, ngakhale abrasion kuti akhoza kukwaniritsa kuponyera pamwamba roughness Ra <0.8μm. Chikhalidwe chake chodzinola chokha (chiwerengero chosweka <5%) chimatsimikizira kudulidwa kosalekeza ndi zotsatira zokhazikika zopukutira.
(3) Kusintha kwa Njira
Timapereka makulidwe ambewu osinthika kuyambira F12 mpaka F10000 kuti agwirizane ndi njira zosiyanasiyana zoponyera:
Makalasi apamwamba (F12-F100): Kutulutsa nkhungu m'mapangidwe ovuta, kukulitsa chiwongola dzanja chopitilira 25%.
Makalasi abwino (F220-F1000): Kuti apange makina a ceramic olondola kwambiri okhala ndi zololera zolimba ngati±0.1 mm.
3. Njira Kukhathamiritsa Mtengo
(1) Kugwiritsa Ntchito Ndalama
Kusintha mchenga wa zircon ndialuminiyamu wonyezimira woyera akhoza kuchepetsa mtengo wa zinthu ndi 30-40%. Imathandizanso kuti makulidwe a zipolopolo achepe ndi 15-20% (kukula kwa chipolopolo: 0.8-1.2 mm), kufupikitsa kuzungulira kwa zipolopolo.
(2) Ubwino Wachilengedwe
Ndi zitsulo zolemera kwambiri zotsika kwambiri (< 0.01%), alumina yosakanikirana yoyera imakwaniritsa miyezo ya chilengedwe ya ISO 14001. Mchenga wa zinyalala umatha kugwiritsidwanso ntchito 100% ndipo ukhoza kugwiritsidwanso ntchito popanga refractory.
Mapulogalamu Otsimikiziridwa
Izi zakhala zikugwiritsidwa ntchito kwambiri m'magawo apamwamba monga ma turbine turbine amlengalenga ndi zida zachipatala zojambulidwa bwino. Milandu yodziwika bwino ikuwonetsa kuti imatha kuchulukitsa mitengo yodutsa kuchokera ku 85% mpaka 97%.