THE CORRELATIONS BETWEEN HEAT TREATMENT, MICROSTRUCTURE AND MAGNETIC PROPERTIES IN A 2:17 TYPE SAMARIUM: TRANSITION METAL MAGNETIC ALLOY

2000 ◽  
Author(s):  
A. KIANVASH
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Transition Metal ◽  
Magnetic Alloy ◽  
Microstructure And Magnetic Properties

Magnetic Properties, Nanostructure, and Ordering Kinetics of Nb Additive FePtCu Films

2010 ◽  
Vol 638-642 ◽  
pp. 1743-1748
Author(s):  
G.J. Chen ◽  
Y.H. Shih ◽  
Jason S.C. Jang ◽  
S.R. Jian ◽  
P.H. Tsai ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Activation Energy ◽  
Magnetic Properties ◽  
Heating Rates ◽  
Fept Alloy ◽  
Ordering Kinetics ◽  
Nb Content ◽  
Kinetics Of ◽  
Nb Addition ◽  
Microstructure And Magnetic Properties

In this study,the (FePt)94-xCu6Nbx (x=0, 2.87, 4.52, 5.67) alloy films were prepared by co-sputtering. The effects of Nb addition content and heat treatment on the microstructure and magnetic properties of the polycrystalline FePtCu films are reported. Our previous experiments showed that the ordering temperature of the (FePt)94Cu6 films reduced to 320 °C, which is much lower than that of the FePt alloy. However, the grain growth after heat treatment limited the practical application in recording media. By adding the Nb content in the (FePt)94Cu6 film, the grain sizes of the films can be adjusted from 50 to 18nm, even for the films annealed at temperature as high as 600°C. DSC traces of as-deposited disorder films at different heating rates, to evaluate the crystallization of the order phase, revealed that the addition of Nb enhanced the activation energy of ordering from 87 kJ/mol to 288 kJ/mol for the (FePt)94-xCu6Nbx (x=0 and 2.87, respectively) films. The reduction of the grain size and the corresponding increase in the activation energy of the Fe-Pt-Cu-Nb films might result from the precipitation of the Nb atoms around the ordering FePt phase. The (FePt)94-xCu6Nbx (x=2.87) film showed a coercive force of 13.4 kOe and the magnetization of 687 emu/cc.

scholarly journals Influence of Heat Treatment on the Microstructure and Magnetic Properties of Mn–Sn–Co–N Alloys

2013 ◽  
Vol 54 (10) ◽  
pp. 2007-2010 ◽  
Author(s):  
Keita Shinaji ◽  
Tsuyoshi Mase ◽  
Keita Isogai ◽  
Masashi Matsuura ◽  
Nobuki Tezuka ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Microstructure And Magnetic Properties

Experimental Study of High Temperature Hydrozing Annealing 1J50 Alloy's Magnetic Properties

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
Yingtao Zhang ◽  
Gang Wang ◽  
Zhenguo Nie ◽  
Wankai Shi ◽  
Yiming Rong
Keyword(s):  
Magnetic Properties ◽  
High Temperature ◽  
Process Parameters ◽  
Quantitative Research ◽  
Annealing Process ◽  
National Standards ◽  
Magnetic Alloy ◽  
Soft Magnetic ◽  
Soft Magnetic Alloy ◽  
Microstructure And Magnetic Properties

The good DC magnetic properties can be achieved for 1J50 soft magnetic alloy by applying high temperature hydrogen annealing. Annealing process parameters, e.g., atmosphere, soaking temperature, and time, are critical to soft magnetic properties. Qualitative results had been done for years. However a quantitative research among process parameters, microstructure, and magnetic properties can be more comprehensive and specific. In this study, a serial of experiments for 1J50 samples under the Chinese national standards. The influence of annealing temperature and socking time on DC magnetic properties and microstructure of the samples has been investigated on DC magnetic properties and microstructure of samples. The result shows that annealing process parameters have a nonlinear effect on the development of material microstructure and magnetic properties. Furthermore, the models among magnetic property, grain size, and process parameters have been built to quantitatively describe the interrelationship in between.

Effect of Heat Treatment on Microstructure and Magnetic Properties of Strontium Hexaferrite Nanoparticles Prepared in Presence of Non-Ionic Surfactant

2013 ◽  
Vol 202 ◽  
pp. 193-205
Author(s):  
Nital R. Panchal ◽  
Rajshree B. Jotania
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Tween 80 ◽  
Strontium Hexaferrite ◽  
Ionic Surfactant ◽  
Treatment Conditions ◽  
Heat Treated ◽  
Higher Temperature ◽  
Co Precipitation ◽  
Microstructure And Magnetic Properties

SrFe12O19 hexaferrite particles containing polyoxyethelene (20) sorbitan monolate (Tween-80) were synthesized by a chemical co-precipitation technique with a precipitator NH3.H2O. The prepared Sr-M hexaferrite precipitates were heat treated at various temperatures 650 oC, 750 oC, 850 oC, 950oC and 1100oC for 4 hrs in a muffle furnace. The obtained Sr-M powders were characterized by using various instrumental techniques, like FTIR, TGA, XRD, SEM, VSM and Mössbauer spectroscopy. Their physical as well as Magnetic properties were compared. It was observed from XRD results that heat treatment conditions play significant role in the formation of pure SrFe12O19 hexaferrite phase and also in the grain size. The estimated particle size is of the order of nanometer when suitable calcination temperature is applied. SEM micrographs show an increase in crystallite size of the resultant SrFe12O19 hexaferrite particles sintered at higher temperature (1100 oC). Mössbauer spectroscopic measurements were carried out at room temperature. Mössbauer analysis indicates the presence Fe3+ ions in the prepared strontium hexaferrite particles.

MAGNETIC PROPERTIES OF SINTERED Nd-Fe-B TYPE MAGNETS CONTAINING CALCIUM, CHLORINE AND CARBON

1992 ◽  
Vol 06 (19) ◽  
pp. 1197-1203 ◽  
Author(s):  
S. SZYMURA ◽  
H. BALA ◽  
YU. M. RABINOVICH ◽  
J. J. WYSLOCKI
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Rich Phase ◽  
Microstructure And Magnetic Properties

The microstructure and magnetic properties of Nd 16-x X x Fe 70.5 Co 5 AlB 7.5 and Nd 14-x Dy 2 X x Fe 71 Co 5 B 8 ( X = Ca , Cl and C ) magnets with various x were examined. In magnets after sintering and heat treatment carbon-rich areas were produced within the non-magnets Nd -rich phase. However chlorine-rich and calcium-rich areas were present in both non-magnetic Nd -rich and B -rich phases. The contribution of C ≤0.35 at%, Cl ≤0.013 at% and Ca ≤0.09 at% had no influence on the magnetic properties (B r and i H c ), but higher concentration of these elements caused decrease in these properties. Abnormal grain growth was found in magnets containing Cl .

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