Eylem Seç
Exploration of Alnico Permanent Magnet Microstructure and Processing for Near Final Shape Magnets with Solid-State Grain Alignment for Improved Properties
Başlık:
Exploration of Alnico Permanent Magnet Microstructure and Processing for Near Final Shape Magnets with Solid-State Grain Alignment for Improved Properties
Yazar:
Kassen, Aaron Gregory, author. (orcid)0000-0001-8459-8780
ISBN:
9780438073999
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (177 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Advisors: Iver E. Anderson Committee members: Scott Chumbley; David Jiles; Matthew Kramer; Alan Russell.
Özet:
Economic uncertainty in the rare earth (RE) permanent magnet (PM) marketplace as well as a quickly evolving electric drive motor market which has decided to leverage permanent magnet synchronous AC drive (PMAC) motors as the motor of choice, has driven renewed research in RE-free permanent magnets such as "alnico." Alnico, essentially an Al-Ni-Co-Fe magnet alloy, was displaced for high energy density applications by RE-containing magnets in the 1970's due to their high-energy performance and high coercivities.
The current PMAC development trajectory requires the development of a sustainable magnet material choice, which not only has impressive mechanical properties, such as those typical of sintered alnico and superior to the RE-containing magnet technologies, but also complementary improved magnetic properties sufficient for new PMAC designs. Further, the technique utilized for consolidation and final processing must support large-scale mass production, which would be required for use in an electric drive vehicle marketplace.
Estimates are currently that a 40% year over year growth will continue to exist in the electric vehicle marketplace, requiring the production of tens of millions of magnets growing simultaneously with the EV market, something the rare earth magnet producers will continue to find challenging as net-shape capabilities are not a strong suit of their current production process.
Using high-pressure gas atomized (HPGA) isotropic "alnico 8H" based powder; fully dense magnets were able to be produced, with magnetic properties that were comparable to their cast counterparts, and in fact superior in many ways. The net shape magnets were subjected to mechanical and magnetic techniques to induce some solid-state texturing. Results for density, microstructure, and magnetic properties were measured, and show a direct correlation between the application of the texture processes and corresponding increases in remanent magnetization and energy products.
Lastly, investigations of the temperature phase space for the alloy compositions used was explored to look for opportunities to further enhance processing control through high-temperature x-ray diffractometry, differential scanning calorimetry, and thermal gravimetric analysis.
Notlar:
School code: 0097
Tüzel Kişi Ek Girişi:
Mevcut:*
Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(679437.1) | 679437-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
On Order
Liste seç
Bunu varsayılan liste yap.
Öğeler başarıyla eklendi
Öğeler eklenirken hata oldu. Lütfen tekrar deneyiniz.
:
Select An Item
Data usage warning: You will receive one text message for each title you selected.
Standard text messaging rates apply.