Toyota Jidosha Kabushiki Kaisha

Kiyotaka Onodera

Takeshi Hattori

Daisuke Okamoto

Hidefumi Kishimoto

Masaaki Tani

Shinjiro Saigusa

Kohei Ishii

Junghwan Hwang

Masashi Ohtsubo

Kiyonori Suzuki

Richard Parsons

Bowen Zang

A method for producing a soft magnetic material having both high saturation magnetization and low coercive force, including: preparing an alloy having a composition represented by Compositional Formula 1 or 2 and having an amorphous phase, and heating the alloy at a rate of temperature rise of 10&#xb0; C./sec or more and holding for 0 to 80 seconds at a temperature equal to or higher than the crystallization starting temperature and lower than the temperature at which Fe&#x2014;B compounds start to form wherein, Compositional Formula 1 is FeBM, M represents at least one element selected from Nb, Mo, Ta, W, Ni, Co and Sn, and x and y are in atomic percent (at %) and satisfy the relational expressions of 10&#x2264;x&#x2264;16 and 0&#x2265;y&#x2264;8, and Compositional Formula 2 is FeBCuM', M&#x2032; represents at least one element selected from Nb, Mo, Ta, W, Ni and Co, and a, b and c are in atomic percent (at %) and satisfy the relational expressions 10&#x2264;a&#x2264;16, 0&#x3c;b&#x2264;2 and 0&#x2264;c&#x2264;8.

Method of producing soft magnetic material

There are provided a soft magnetic material having a high saturation magnetization and a low coercive force and excellent in thermal endurance, and a method for producing the same. The present disclosure relates to a soft magnetic material represented by the following composition formula: FeBNi, wherein x satisfies 10&#x2264;x&#x2264;16 in at %, and y satisfies 0&#x3c;y&#x2264;4 in at %, having a coercive force of 20 A/m or less, and having a coercive force characteristic decrease rate after a thermal endurance test {[(coercive force after thermal endurance test&#x2212;coercive force before thermal endurance test)/coercive force before thermal endurance test]&#xd7;100 (%)} of 20% or less, wherein the thermal endurance test is carried out by allowing the soft magnetic material to stand in a constant temperature oven at 170&#xb0; C. in the air for 100 h, and a method for producing the same.

Soft magnetic material and method for producing the same

It is an object of the present disclosure to produce a soft magnetic material having high saturation magnetization by heat-treating a Fe-based amorphous alloy, without needing the control of the atmosphere. The present disclosure provides a method for producing a soft magnetic material, including heat treating a Fe-based amorphous alloy in a state in which the alloy is wrapped with a sheet comprising one or more substances having a standard Gibbs energy of formation of an oxide thereof that is larger in a negative direction than Fe, to form a crystal phase.

Method for producing soft magnetic material

A soft magnetic member is formed such that, when a differential relative permeability in an applied magnetic field of 100 A/m is represented by a first differential relative permeability &#x3bc;'L, and when a differential relative permeability in an applied magnetic field of 40 kA/m is represented by a second differential relative permeability &#x3bc;&#x2032;H, a ratio of the first differential relative permeability &#x3bc;&#x2032;L to the second differential relative permeability &#x3bc;&#x2032;H satisfies a relationship of &#x3bc;&#x2032;L/&#x3bc;&#x2032;H&#x2264;10, and a magnetic flux density in an applied magnetic field of 60 kA/m is 1.15 T or higher.

Soft magnetic member, reactor, powder for dust core, and method of producing dust core

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Miyoshi, Japan

Kiyotaka Onodera