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Magnetic abrasive and preparation method thereof

A magnetic abrasive and ball milling technology, which is applied to the magnetism of inorganic materials, chemical instruments and methods, and other chemical processes, can solve the problems of easy separation and scattering, poor bonding strength, and low processing efficiency

Active Publication Date: 2021-01-29
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the interface bonding strength between the hard phase and the ferromagnetic phase in the magnetic abrasive prepared by the mechanical mixing method is poor, and it is easy to separate and scatter, resulting in low processing efficiency; the interface between the hard phase and the ferromagnetic phase in the magnetic abrasive prepared by the sintering method has Fe , The interdiffusion phenomenon of Si and C atoms, resulting in the poor interface bonding strength between the hard phase and the ferromagnetic phase, and the uneven distribution of the hard phase on the surface of the ferromagnetic phase

Method used

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  • Magnetic abrasive and preparation method thereof
  • Magnetic abrasive and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0025] The invention provides a kind of preparation method of magnetic abrasive, comprises the following steps:

[0026] Oxidize silicon carbide to obtain surface oxidized silicon carbide;

[0027] ball milling the surface oxidized silicon carbide and the ferromagnetic phase to obtain a mixture;

[0028] The mixture is heat-treated to obtain a magnetic abrasive.

[0029] In the present invention, unless otherwise specified, the raw materials used are conventional commercially available products in this field.

[0030] In the invention, silicon carbide is oxidized to obtain oxidized silicon carbide.

[0031] In the present invention, the temperature of the oxidation treatment is preferably 800-1400°C, more preferably 1000-1200°C; the time of the oxidation treatment is preferably 8-12h, more preferably 10-11h; The temperature increase rate of the treatment temperature is preferably 5°C / min, more preferably 5°C / min. In the present invention, the silicon carbide is preferably ...

Embodiment 1

[0050] Put silicon carbide in a heating furnace, in a static air atmosphere, heat 200g of silicon carbide (particle size: 20μm) to 1200°C at a heating rate of 5°C / min, perform oxidation treatment for 10h, and then cool to room temperature with the furnace , the cooling rate is 5°C / min, and the surface oxidized silicon carbide is obtained;

[0051] Sieve the obtained surface oxidized silicon carbide to obtain surface oxidized silicon carbide with a particle size of 20 μm, and perform ultrasonic washing to remove impurities;

[0052] Mix 200g of surface oxidized silicon carbide with a particle size of 20μm and 800g of carbonyl iron with a particle size of 150μm at a mass ratio of 4:1, and perform ball milling after fully stirring at a speed of 50rpm for 30min. The ball milling medium is steel balls , the particle size of the steel balls is 8-10 mm, the ball-to-material ratio is 10:1, the filling coefficient is 0.4, the rotation speed is 175 rpm, and the mixture is obtained after...

Embodiment 2

[0064] The difference between this example and Example 1 is that the obtained mixture is put into a vacuum sintering furnace and heat-treated at 1200°C. After 2 hours, a magnetic abrasive is obtained. The magnetic abrasive includes a carbonyl iron core and embedded carbonyl Surface oxidized silicon carbide layer in the iron core.

[0065] The performance of the magnetic abrasive material obtained in this embodiment is tested under the same grinding conditions as in Example 1, and the obtained results are: the optimal grinding time of the magnetic abrasive material obtained in this embodiment is 25min; after processing for 5min, the initial roughness Ra =1.10±0.01 μm down to Ra=0.274±0.01 μm.

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Abstract

The invention provides a magnetic abrasive and a preparation method thereof, and belongs to the technical field of magnetic abrasive preparation. The preparation method provided by the invention comprises the following steps: carrying out oxidation treatment on silicon carbide to obtain surface oxidized silicon carbide; mixing the surface silicon carbide oxide with a ferromagnetic phase to obtaina mixture; and allowing the mixture to be subjected to heat treatment, to obtain the magnetic abrasive. The bonding strength of the interface between the surface silicon carbide oxide and the ferromagnetic phase in the prepared magnetic abrasive is high, the relative permeability of the magnetic abrasive is high, and the magnetic abrasive has good processability and processing efficiency.

Description

technical field [0001] The invention belongs to the technical field of magnetic abrasive preparation, and in particular relates to a magnetic abrasive and a preparation method thereof. Background technique [0002] The magnetic grinding technology drives the magnetic abrasive to continuously grind the surface of the workpiece through the magnetic field force, so as to realize the efficient and high-precision processing of the surface of the special-shaped component and improve the durability of the component. This method has excellent self-adaptability, self-sharpening and controllability in technology, small temperature rise, and no need for tool wear compensation. The manufacturing cost of the part. Therefore, it has attracted extensive attention and research at home and abroad, and has been applied in the grinding and finishing of planes, outer circular surfaces, inner circular surfaces, and complex molding surfaces, as well as micro-structural parts and deburring. [0...

Claims

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Application Information

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IPC IPC(8): C09K3/14H01F1/01
CPCC09K3/1436H01F1/01
Inventor 张辛健李文生成波李建军何东青翟海民
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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