Method for firing low-cobalt fine-grain hard alloy by using ordinary sintering furnace

A cemented carbide and sintering furnace technology, which is applied in the field of firing low-cobalt fine-grained cemented carbide in ordinary sintering furnaces, can solve problems such as difficult control of product quality, achieve the effect of reducing internal pores and reducing carbon loss in the furnace

Inactive Publication Date: 2015-12-09
ZHEJIANG HENGCHENG CEMENTED CARBIDE
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for firing low-cobalt fine-grained hard alloys in ordinary sintering furnaces, which can effec

Method used

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Embodiment Construction

[0011] An embodiment of the method for firing low-cobalt fine-grained hard alloys in ordinary sintering furnaces, taking the firing of grade YG6X low-cobalt fine-grained Rare gases such as argon or helium are used for dewaxing. After dewaxing, the furnace is kept at 0.2 MPa for micro positive pressure sintering. / min heating rate for sintering, sintering temperature of 1430 ℃, 60 minutes of heat preservation.

[0012] After sintering by the above method, the cobalt magnetism is 5.2, and the porosity is A02B00. However, the cobalt magnetism is 4.2, and the product is seriously decarburized.

[0013] First use argon positive pressure to dewax, and after dewaxing, protect sintering with argon micro positive pressure. The sintering temperature is close to but lower than the eutectic point temperature. Keep it warm for a period of time. At this time, the product shrinks by 80%-90%. The surface energy decreases rapidly, and the sensitivity to oxygen is reduced. After cooling down, ...

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Abstract

The invention discloses a method for firing a low-cobalt fine-grain hard alloy by using an ordinary sintering furnace. The method sequentially comprises steps as follows: a low-cobalt fine-grain hard alloy blank is placed in the sintering furnace, and inert gas is introduced for dewaxing; the inert gas is kept in the sintering furnace for micro-positive-pressure sintering after dewaxing, the sintering temperature is lower than the eutectic temperature by 10-20 DEG C, and the temperature is kept for 30-120 min; vacuum pumping is performed for secondary sintering, sintering is performed at the sintering temperature ranging from 1380 DEG C to 1470 DEG C for 60-120 min at the heating speed of 5-20 DEG C/min, and sintering is finished after the temperature is reduced to the room temperature. Compared with the conventional sintering method, the method has the advantages as follows: the cobalt magnetism is increased from 4.2 to 5.2, the product finishes 80%-90% of shrinkage after sintering for the first time, the grain surface energy is quickly reduced, the sensitivity to oxygen is reduced, secondary vacuum sintering is performed after cooling and can adopt the higher heating speed, thus, the carbon loss in the furnace is reduced as much as possible, inner gas can be removed, and inner pores of the product are greatly reduced.

Description

technical field [0001] The invention relates to a method for firing low-cobalt fine-grained hard alloy in a common sintering furnace. Background technique [0002] In the production of cemented carbide products, the quality and stability of the products have very high requirements on the equipment. For the sintering furnaces with tens of millions of sintering furnaces, it is difficult for small-scale production enterprises to bear. For the old equipment, the stability of the equipment is poor, and the two-phase region of the low-cobalt fine-grain is narrow. Such equipment is difficult to stably burn qualified low-cobalt fine-grain products. The internal porosity of the product must be controlled by vacuum sintering in the first sintering, and the heating rate of the first sintering should not be too fast. Contents of the invention [0003] The purpose of the present invention is to provide a method for firing low-cobalt fine-grained hard alloys in ordinary sintering furna...

Claims

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Application Information

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IPC IPC(8): B22F3/10C22C1/05
Inventor 陈军金益民吴晓娜
Owner ZHEJIANG HENGCHENG CEMENTED CARBIDE
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