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Magnetic material curie temperature measuring method based on thermogravimetry changes

A magnetic material, Curie temperature technology, applied in thermometers, thermometers, measuring devices and other directions using directly sensitive electrical/magnetic components, can solve the problems of high cost, unstable external magnetic field, complex structure, etc., to achieve economical Convenience, avoid the problem of coil heating, easy to promote the effect

Active Publication Date: 2015-04-29
DALIAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, generating a high-intensity external magnetic field means that a strong current needs to be passed through the electromagnet coil, which can easily cause high temperature in the coil or electromagnet core, which in turn leads to instability of the external magnetic field, causing the measured Curie temperature to deviate from the true value
For this reason, it usually needs to be equipped with a circulating water cooling system to cool the coil and the electromagnet core, the structure is complex and the cost is high

Method used

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  • Magnetic material curie temperature measuring method based on thermogravimetry changes
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  • Magnetic material curie temperature measuring method based on thermogravimetry changes

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Embodiment Construction

[0028] Below by measuring CoFe 2 o 4 The Curie temperature of the particles specifically describes the process of the invention. Specific steps are as follows:

[0029] (1) Utilizing four carbon steel bolts 7 of M5 above the cooling system 15 of the thermogravimetric analyzer

[0030] Fixing a volume is 5cm * 5cm * 1cm, pure iron iron core 8, is covered with 8 turn insulated copper coils 9 on the pure iron core, forms electromagnet. Connected to both ends of the electromagnet coil 9 is a circuit control system 10, which consists of an AC-to-DC regulated power supply (220V to 12V), a fuse (rated current 2A, fusing current 3A), an ammeter and a resistance box (about 0-10kΩ) formed in series. Wherein, the current surface plate 11 and the resistance box knob 12 are all inlaid on the side of the thermogravimetric analyzer for convenient adjustment.

[0031] (2) Weigh about 36mg of CoFe 2 o 4 The sample is placed in the alumina crucible 13, and then placed together on the bal...

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Abstract

The invention belongs to the technical field of the thermomagnetic measurement of magnetic materials, and relates to a magnetic material curie temperature measuring method based on thermogravimetry changes. Through measuring the changing relationship between balance apparent weight and temperature under the effect of a low field intensity applied magnetic field, the curie temperature of a magnetic substance is obtained. The suction effect of an electromagnet to the magnetic substance is related to magnetic field intensity and also relies on the gradient changes of the magnetic field intensity, therefore the obvious thermogravimetry changes can be obtained under a non-uniform field intensity applied magnetic field with relatively lower field intensity, and the changes can be easily measured by a high-precision analytical balance. According to the magnetic material curie temperature measuring method based on the thermogravimetry changes, the obvious thermogravimetry changes can be obtained by using the non-uniform field intensity applied magnetic field with the relatively lower field intensity, and then the curie temperature of the magnetic substance can be measured; the problem of coil heating caused by the fact that a high-intensity magnetic field needs to be loaded when materials with weaker magnetism are measured by using a magnetic-thermo curve method is avoided; the method is economical and convenient, and is easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of thermomagnetic measurement of magnetic materials, relates to the measurement of the magnetic properties of magnetic materials, in particular to a method for measuring the Curie temperature of magnetic materials based on thermogravimetric changes. Background technique [0002] Curie temperature refers to the transition temperature of magnetic materials between ferromagnets and paramagnets. Curie temperature can be used to control the working state of magnetic control components, such as electromagnetic protection switches. A commonly used method for measuring the Curie temperature of magnetic materials is to place the magnetic material in a certain external magnetic field, and obtain it by analyzing the magnetocaloric curve of the material (the relationship between magnetization and temperature), that is, to measure the temperature of the magnetic material under the action of a certain external magnetic fie...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/36
Inventor 张伟左旭东吴承伟
Owner DALIAN UNIV OF TECH
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