Kuita kweWhite Fused Alumina mu Investment Casting
1. Investment Casting Shell Material
White yakasanganiswa aluminainogadzirwa nekusanganisa emhando yepamusoro indasitiri alumina pane tembiricha iri pamusoro pe2000°C. Inopa kuchena kwakasiyana-siyana (αAl₂O₃zviri mukati > 99-99.6%) uye yakakwira refractoriness ye2050°C-2100°C, ine yakaderera kupisa kwekuwedzera coefficient (inenge 8×10⁻⁶/°C). Izvi zvivakwa zvinoita kuti ive yakanakisa imwe nzira kune yechinyakare zircon jecha seyekutanga shell zvinhu zvekukandira mari. Yayo yakakwira particle kufanana (saizi yezviyo kugovera> 95%) uye kupararira kwakanaka kunobatsira kugadzira denser, rakasimba molds, kuvandudza zvakanyanya kukanda kwepamusoro kupedzisa uye kurongeka kwechokwadi uku uchidzikisa hurema.
2. Mold Reinforcement
Iine kuomarara kweMohs ye9.0 uye yakanakisa-yepamusoro-tembiricha kuchengetedza simba (kuchengetedza kuvimbika pamusoro pe1900°C),white fused aluminainowedzera hupenyu hwesevhisi yekuumbwa ne30-50%. Kana yakashandiswa mukuumbwa kana macores esimbi yakakandwa, simbi yakakandwa, kana isina-ferrous alloys, inonyatso kurwisa simbi inoyerera uye inoderedza kuwanda kwekugadzirisa nekugadzirisa.
Zvakanakira zveWhite Fused Alumina
(1) High-Temperature Kugadzikana
White yakasanganiswa aluminainopa kugadzikana kwe thermochemical panguva yekukanda mashandiro. Kupisa kwayo kwekuwedzera kweiyo coefficient inenge chikamu chimwe muzvitatu chezvakajairwa zvinhu, zvichibatsira kudzivirira kuputika kwe mold kana kukanda deformation nekuda kwekushanduka kwekushisa kamwe kamwe. Yayo yakaderera gasi shanduko (gasi kuburitswa <3 ml/g) inoderedza porosity uye kukanganiswa kwemhepo.
(2) Surface Kupedzisa Hunhu
Kana ichishandiswa sehupfu hwekupenya (saizi yezviyo 0.5-45μm),white fused aluminainoburitsa isingachinji, kunyangwe abrasion iyo inogona kuwana yekukanda pamusoro roughness yeRa <0.8μm. Yayo yekuzvirodza hunhu (kutyora mwero <5%) inogonesa yakaramba ichicheka kunyatsoshanda uye yakagadzika polishing mhedzisiro.
(3) Maitiro Anochinjika
Isu tinopa zvinochinjika zviyo saizi kubva F12 kusvika F10000 kuti ikwane akasiyana ekukanda maitiro:
Coarse mamakisi (F12-F100): Kuburitsa mold muzvimiro zvakaoma, kuwedzera kudhirowa kwebudiriro mazinga nepamusoro pe25%.
Magiredhi akanaka (F220-F1000): Yekugadzira yakakwirira-chaiyo ceramic cores nekugadzira kushivirira kwakasimba se±0.1 mm.
3. Process Optimization Value
(1) Kushanda Kwemari
Kutsiva zircon jecha newhite fused alumina inogona kuderedza mari yezvinhu ne30-40%. Inogonesa zvakare kukora kwegomba kuderedzwa ne15-20% (yakajairika goko ukobvu: 0.8-1.2 mm), kupfupisa denderedzwa rekuvaka-ganda.
(2) Kubatsira Kwezvakatipoteredza
Iine ultra-low heavy metal content (<0.01%), white fused alumina inosangana ne ISO 14001 yezvakatipoteredza zviyero. Jecha remarara rinoshandiswazve ne100% uye rinogona kushandiswa zvakare mukugadzira refractory.
Proven Applications
Ichi chinyorwa chakagamuchirwa zvakanyanya muminda-yepamusoro-soro senge aerospace turbine blades uye yezvokurapa chaiyo yekukanda. Mhosva dzakajairwa dzinoratidza kuti inogona kuwedzera mareti ekupasa kwechigadzirwa kubva pa85% kusvika 97%.