Alumina yumbu wani nau'i ne na alumina (Al2O3) a matsayin babban kayan yumbu, a halin yanzu yana ɗaya daga cikin tukwane na musamman na yau da kullun, ana iya amfani da shi sosai a cikin manyan masana'antu da manyan masana'antu, kamar microelectronics, injin nukiliya, sararin samaniya, magnetic. samar da wutar lantarki na ruwa, kashi na wucin gadi da haɗin gwiwa na wucin gadi da sauran fannoni, ta hanyar yardar mutane da ƙauna.
Abubuwan yumbura na alumina suna da fa'idodi masu zuwa:
1, Taurin yumburan alumina yana da girma sosai, juriya mai kyau.
2, tukwane na alumina suna da juriyar lalata sinadarai da kaddarorin gwal da aka zube.
3, alumina yumbu abu yana da kyakkyawan rufin, babban hasara mai yawa yana da ƙananan ƙananan amma kyawawan halayen haɓakaccen mita.
4, alumina yumbu abu yana da halaye na zafi juriya, kananan coefficient na thermal fadada, babban inji ƙarfi da kuma mai kyau thermal watsin.
5, juriya na alumina yumbura yana da kyau, amma taurin daidai yake da na corundum, kuma juriya na juriya na Mohs hardness matakin 9 yana kama da na superhard alloys.
6, alumina yumbura suna da halaye na ba konewa, tsatsa, ba sauƙin lalacewa ba, wanda shine sauran kayan halitta da kayan ƙarfe ba za su iya dacewa da kyakkyawan aikin ba.
| Ma'aunin Fasaha | ||
| Aikin | Naúrar | Ƙimar lambobi |
| Kayan abu | / | Al2O3 ：99.5% |
| Launi | / | Fari, Ivory |
| Yawan yawa | g/cm3 | 3.92 |
| Ƙarfin Flexural | MPa | 350 |
| Ƙarfin Ƙarfi | MPa | 2,450 |
| Modul na Matasa | GPA | 360 |
| Ƙarfin Tasiri | MPa m1/2 | 4-5 |
| Weibull Coefficient | m | 10 |
| Vickers Hardness | HV 0.5 | 1,800 |
| (Thermal Expansion Coefficient) | 1n-5k-1 | 8.2 |
| Thermal Conductivity | W/mK | 30 |
| Karfin Girgizar Ruwa | △T°C | 220 |
| Matsakaicin zafin amfani | °C | 1,600 |
| 20°C Juyin Juriya | Ωcm | > 1015 |
| Ƙarfin Dielectric | kV/mm | 17 |
| Dielectric Constant | εr | 9.8 |
