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Method capable of improving magnetic saturation of hard alloy pre-sintered blanks

A cemented carbide, pre-sintering technology, applied in the field of cemented carbide processing, can solve the problems of decarburization, carburization, different carbon content and so on

Active Publication Date: 2018-10-12
XIAMEN GOLDEN EGRET SPECIAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this processing method, since the sintering is carried out in a sintering furnace with a certain volume, the concentration of C at each position in the sintering furnace and the length of time the product is in contact with the decomposed C are different, resulting in different carbon content of the final product, thus The magnetic saturation is different, that is, the magnetic saturation of some positions is high, and the magnetic saturation of some positions is low, resulting in uneven magnetic saturation of the cemented carbide pre-sintered billet, and the product is prone to partial carburization and decarburization.

Method used

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  • Method capable of improving magnetic saturation of hard alloy pre-sintered blanks
  • Method capable of improving magnetic saturation of hard alloy pre-sintered blanks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0020] A kind of method of the present invention can promote the magnetic saturation of cemented carbide calcined billet, it comprises the steps:

[0021] Take an appropriate amount of solid paraffin and put it into the preset container;

[0022] Place the vessel that has been filled with solid paraffin on a heating device for heating, and heat until the solid paraffin melts into a liquid state;

[0023] Putting cemented carbide calcined billets into the vessel in batches, and completely soaking them in liquid paraffin;

[0024] Control the temperature during the soaking process, and soak for a certain period of time according to the carbon content of the calcined billet;

[0025] When the immersion time is up, take out the pre-sintered cemented carbide billet, and sinter it according to the conventional sintering method in the prior art; thus obtain a cemented carbide product with enhanced magnetic saturation and uniform magnetic saturation.

[0026] Wherein, said controlli...

no. 1 example

[0031] Take a cemented carbide product with a component of 12wt.% Co and a WC particle size of 0.4 μm, and immerse it in liquid paraffin with a melting point of 58°C; before implementation, the magnetic saturation of the cemented carbide calcined billet is 72%;

[0032] figure 1 is the corresponding relationship between the increase in magnetic saturation and the soaking time of the product, given by figure 1 It can be seen that the magnetic saturation increases significantly with the increase of soaking time;

[0033] When the product is soaked for 2 minutes, the magnetic saturation increases to 78.1%, when the product is soaked for 4 minutes, the magnetic saturation increases to 81%, when the product is soaked for 10 minutes, the magnetic saturation increases to 83%;

[0034] For this reason, the soaking time of the cemented carbide calcined compact can be determined according to the carbon content requirement (i.e. the degree of magnetic saturation) of the calcined compact...

no. 2 example

[0036] Take a cemented carbide product with a component of 3wt.% Co and a WC particle size of 1.0 μm, and immerse it in liquid paraffin with a melting point of 64°C; before implementation, the magnetic saturation of the cemented carbide calcined billet is 74%;

[0037] figure 2 is the corresponding relationship between the increase in magnetic saturation and the soaking time of the product, given by figure 2 It can be seen from the figure that as the soaking time increases, the magnetic saturation increases significantly; when it increases to a certain extent, as the soaking time continues to increase, the magnetic saturation increases slowly;

[0038] When the product is soaked for 1 minute, the magnetic saturation increases to 94%, when the product is soaked for 2 minutes, the magnetic saturation increases to 96%, when the product is soaked for 5 minutes, the magnetic saturation increases to 96.5%;

[0039] For this reason, the soaking time of the cemented carbide calcine...

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Abstract

The invention discloses a method capable of improving magnetic saturation of hard alloy pre-sintered blanks. The method comprises the following steps that a proper amount of solid paraffin is taken, and is put into a preset utensil; the utensil where the solid paraffin is put into is placed on a heating device for heating, and is heated until the solid paraffin is melted to be in a liquid state; the hard alloy pre-sintered blanks are put into the utensil in a batch mode, and are completely soaked in the paraffin in the liquid state; the temperature in the soaking process is controlled, and thehard alloy pre-sintered blanks are soaked for a certain time according to the carbon content requirements of the pre-sintered blanks; and when the soaking time is up, the hard alloy pre-sintered blanks are taken out, and then are sintered according to a conventional sintering method in the prior art, so that hard alloy products with improved magnetic saturation and uniform magnetic saturation areobtained. According to the method, through the improvement of the process, the magnetic saturation of the hard alloy pre-sintered blanks can be effectively improved, and the magnetic saturation is uniform and controllable.

Description

technical field [0001] The invention relates to the technical field of hard alloy processing, in particular to a method capable of improving the magnetic saturation of hard alloy calcined billets. Background technique [0002] Cemented carbide is an alloy material made of hard compounds of refractory metals and bonding metals through powder metallurgy. Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance, which basically remain unchanged even at a temperature of 500°C , It still has high hardness at 1000 °C. Cemented carbide is widely used as tool material, such as turning tools, milling cutters, planers, drills, boring tools, etc., for cutting cast iron, non-ferrous metals, plastics, chemical fibers, graphite, glass, stone and ordinary steel, and can also be used for cutting Difficult-to-machine materials such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/10B22F3/11
CPCB22F3/1003B22F3/11
Inventor 李云龙晏平姜涛张汉清吴高武刘自海江元祥
Owner XIAMEN GOLDEN EGRET SPECIAL ALLOY
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