Role of aging time on the magnetic properties of Sm2Co17 permanent magnets processed through cold isostatic pressing

The microstructure and mechanical properties of zirconia toughened alumina (ZTA) ceramic added with niobia (Nb2O5) through cold isostatic pressing (CIP) method was investigated. The amount of Nb2O5 is varied from 0 wt.% to 7 wt.%. The phase composition of the sintered bodies was analyzed with an x-ray diffractometer, while their microstructure was observed with a scanning electron microscope. It is found that up to 3 wt.% of Nb2O5 addition, the secondary phase of Nb2Zr6O17 presence as square shape particles confirm by SEM and EDX. The addition of 3 wt.% showed the highest Vickers hardness value with 1600HV. It was observed that, further addition of Nb2O5 (> 3 wt.% ) deteriorates the Vickers hardness of ZTA. While the fracture toughness value increased at 3 wt.% until 5 wt.% of Nb2O5 addition (6.71 MPa · √m and 6.80 MPa · √m respectively). It was also found that the value for bulk density increased and porosity decreased with the increasing of Nb2O5 addition.

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Role of nanoscale interfacial defects on magnetic properties of the 2:17-type Sm–Co permanent magnets

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2019.152620 ◽

2020 ◽

Vol 816 ◽

pp. 152620 ◽

Cited By ~ 6

Author(s):

Xin Song ◽

Xianglong Zhou ◽

Tao Yuan ◽

Jingdong Wang ◽

Ming Yue ◽

...

Keyword(s):

Magnetic Properties ◽

Permanent Magnets ◽

Interfacial Defects

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Role of primary Zr-rich particles on microstructure and magnetic properties of 2:17-type Sm-Co-Fe-Cu-Zr permanent magnets

Journal of Material Science and Technology ◽

10.1016/j.jmst.2020.04.018 ◽

2020 ◽

Vol 53 ◽

pp. 73-81 ◽

Cited By ~ 3

Author(s):

Tao Yuan ◽

Xin Song ◽

Xianglong Zhou ◽

Wentao Jia ◽

Munzali Musa ◽

...

Keyword(s):

Magnetic Properties ◽

Permanent Magnets ◽

Microstructure And Magnetic Properties

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Role of cold isostatic pressing in the formation of the properties of ZrO2-base ceramics obtained from ultradisperse powders

Refractories ◽

10.1007/bf02226988 ◽

1995 ◽

Vol 36 (1-2) ◽

pp. 47-53

Author(s):

G. Ya. Akimov ◽

I. Yu. Prokhorov ◽

I. V. Gorelik ◽

V. M. Timchenko ◽

V. G. Vereshchak ◽

...

Keyword(s):

Cold Isostatic Pressing ◽

Isostatic Pressing

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Role of Heat Treatment in Magnetic Properties of Fe-Co-Ni-Al-Cu-Ti Alloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.510-511.394 ◽

2012 ◽

Vol 510-511 ◽

pp. 394-398 ◽

Cited By ~ 1

Author(s):

S. Imran ◽

M.S. Awan ◽

M.N. Sarwar ◽

S. Akhtar ◽

M. Farooque

Keyword(s):

Heat Treatment ◽

Magnetic Properties ◽

Single Phase ◽

Permanent Magnets ◽

X Ray ◽

Casting Technique ◽

Alloy Casting ◽

The Matrix ◽

Metallurgical Structure

Anisotropic (Fe-24Co-15Ni-7.5Al-3Cu-0.3Ti) permanent magnets were prepared by alloy casting technique. Samples were characterized for structural, microstructural and magnetic properties using x-ray diffractrometer (XRD), Scanning electron microscope (SEM) equiped with energy dispersive x-ray spectrometer and DC magnetometer. There is a relation between metallurgical structure and magnetic properties. The magnetic properties of this type of alloy depend on heat-treatment that is controlling the cooling rate in the presence of magnetic field and double aging. How magnetic properties vary with heat treatment is discussed in this work. XRD studied revealed that the alloy was single phase (bcc) with (110) as the major crystallographic plane. Optical and SEM micrographs showed the presence of (Ti,S)-rich precipitates which are randomly distributed in the matrix. Their composition was analyzed by EDX analysis.

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Nanocrystalline and Nanostructured High-Performance Permanent Magnets

MRS Proceedings ◽

10.1557/proc-674-u2.4 ◽

2001 ◽

Vol 674 ◽

Cited By ~ 4

Author(s):

D. Goll ◽

W. Sigle ◽

G.C. Hadjipanayis ◽

H. Kronmüller

Keyword(s):

Magnetic Properties ◽

High Performance ◽

Permanent Magnets ◽

Maximum Energy ◽

High Quality ◽

Hardening Mechanism ◽

Temperature Dependences ◽

Complex Correlation ◽

Energy Products

ABSTRACTThe rather complex correlation between the microstructure and the magnetic properties is demonstrated for two types of high-quality RE-TM permanent magnets (pms), namely nanocrystalline RE2Fe14B (RE = Nd,Pr) and nanostructured Sm2(Co,Cu,Fe,Zr)17 pms. The detailed analysis of this correlation for both pm materials leads to a quantitative comprehension of the hardening mechanism enabling the optimization of their magnetic properties and temperature dependences. In the case of RE2Fe14B, isotropic bonded pms are fabricated showing maximum energy products in the order of 90 kJ/m3. In the case of Sm2(Co,Cu,Fe,Zr)17, magnets with excellent high-temperature magnetic properties are tailored. Hereby, the investigations in addition provide important clues to the evolution of the characteristic microstructural and magnetic properties and to the role of the involved elements.

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Magnetic performance enhancement in La-Ca-Co doped SrFe12O19 ferrite permanent magnets via cold isostatic pressing

Materials Research Express ◽

10.1088/2053-1591/ab89da ◽

2020 ◽

Vol 7 (4) ◽

pp. 046107

Author(s):

Z W Geng ◽

M Haseeb ◽

X K Quan ◽

B S Li ◽

W Q Liu ◽

...

Keyword(s):

Permanent Magnets ◽

Performance Enhancement ◽

Cold Isostatic Pressing ◽

Isostatic Pressing ◽

Magnetic Performance ◽

Co Doped

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Magnetic Properties of xCeO2â€¢(50 âˆ’ x) PbOâ€¢50B2O3 Glasses and Glass Ceramics

JOURNAL OF ADVANCES IN PHYSICS ◽

10.24297/jap.v13i1.6785 ◽

2017 ◽

Vol 13 (1) ◽

pp. 4486-4494 ◽

Cited By ~ 1

Author(s):

G.El Damrawi ◽

F. Gharghar

Keyword(s):

Magnetic Properties ◽

Large Scale ◽

Glass Ceramics ◽

Magnetic Behavior ◽

Crystal Formation ◽

Dual Roles ◽

Effective Agent ◽

Ordered Structures ◽

Essential Change

Cerium oxide in borate glasses of composition xCeO2Â·(50 âˆ’ x)PbOÂ·50B2O3 plays an important role in changing both microstructure and magnetic behaviors of the system. The structural role of CeO2 as an effective agent for cluster and crystal formation in borate network is clearly evidenced by XRD technique. Both structure and size of well-formed cerium separated clusters have an effective influence on the structural properties. The cluster aggregations are documented to be found in different range ordered structures, intermediate and long range orders are the most structures in which cerium phases are involved. The nano-sized crystallized cerium species in lead borate phase are evidenced to have magnetic behavior. The criteria of building new specific borate phase enriched with cerium as ferrimagnetism has been found to keep the magnetization in large scale even at extremely high temperature. Treating the glass thermally or exposing it to an effective dose of ionized radiation is evidenced to have an essential change in magnetic properties. Thermal heat treatment for some of investigated materials is observed to play dual roles in the glass matrix. It can not only enhance alignment processes of the magnetic moment but also increases the capacity of the crystallite species in the magnetic phases. On the other hand, reverse processes are remarked under the effect of irradiation. The magnetization was found to be lowered, since several types of the trap centers which are regarded as defective states can be produced by effect of ionized radiation.

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