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A Control Method for Adjusting the Composition of Cemented Carbide Adhesive Phase

A technology of cemented carbide and control methods, which is applied in the field of cemented carbide processing, can solve problems such as disrupting on-site production rhythm, poor stability of binder phase composition, and prolonging the manufacturing cycle, so as to improve the uniformity of product phase composition and enhance Magnetic saturation stability, effect of reducing waiting time

Active Publication Date: 2021-11-26
XIAMEN GOLDEN EGRET SPECIAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, the existing technology has the disadvantage of uneven composition of the core and the exterior of the binder phase of the product. This is because the compacted product is exposed to the air, and the exterior is preferentially oxidized; the oxide film formed after the oxidation of the outer layer will further hinder the transfer of oxygen. The core diffuses to form a difference in the degree of oxidation from the core to the outside; the difference in the degree of oxidation eventually leads to uneven tungsten content in the binder phase of the product after sintering
[0009] Moreover, the prior art also has the disadvantage of poor stability of the binder phase components between batches of products. This is because between different batches, there are differences in the raw materials themselves (such as different oxygen contents in the raw materials). The composition of the binder phase of the sintered product will be different if it is left for a long time.
Although the storage time can be shortened or extended according to the different conditions of raw materials in the actual operation process, there are the following problems: 1) prolonging the time is not conducive to product circulation; prolonging the manufacturing cycle; 2) shortening the time will disrupt the beat of on-site production; or shortening is not conducive to production scheduling

Method used

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  • A Control Method for Adjusting the Composition of Cemented Carbide Adhesive Phase
  • A Control Method for Adjusting the Composition of Cemented Carbide Adhesive Phase
  • A Control Method for Adjusting the Composition of Cemented Carbide Adhesive Phase

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The composition of cemented carbide is 12wt.% Co, the product with WC particle size of 0.4μm, the outer diameter of the product is 25mm, at 150°C, the oxidation treatment for 10h is compared with the product of the same specification produced by the same raw material for 10h and 72h, see Table 6.

[0055] Table six

[0056]

[0057] For 12wt.% Co, 0.4μm WC products with an outer diameter of 25mm and a length of 330mm, at 150°C, after oxidation treatment for 10 hours, the magnetic saturation is 80%; for products of the same specification produced from the same raw materials, the magnetic saturation is 93% after conventional storage for 10 hours. The results of metallographic examination of the alloy show that there is C06 carburization (in the national standard, C00, C02, C04, C06, and C08 are used to express the carburizing phase).

Embodiment 2

[0059] The composition of cemented carbide is 10wt.% Co, the product with WC particle size of 0.8μm, the outer diameter of the product is 25mm, at 180°C, the oxidation treatment for 4h is compared with the product of the same specification produced from the same raw material for 4h and 72h, see Table 7.

[0060] Table seven

[0061]

[0062] For 10wt.% Co, the WC particle size is 0.8μm, the outer diameter is 25mm, and the length is 330mm. At 180°C, after oxidizing for 4 hours, the magnetic saturation is 80%; the product of the same specification produced by the same raw material is stored in the conventional way for 4 hours, and the magnetic saturation is 90%. .

Embodiment 3

[0064] The composition of cemented carbide is 3wt.% Co, the product with WC particle size of 1.0μm, the outer diameter of the product is 12mm, at 140°C, the oxidation treatment for 2h is compared with the product of the same specification produced from the same raw material for 2h and 36h, see Table 8.

[0065] table eight

[0066]

[0067] A control method for adjusting the cemented carbide bonding phase composition of the present invention adopts the method of placing the molded or extruded cemented carbide compact in the heater and feeding it to the cemented carbide before sintering A certain flow of air is introduced into the heater, and under the preset temperature condition, it is kept warm for a certain period of time, so that the oxygen in the air and the metal elements in the cemented carbide can be oxidized; In the process, through sufficient carbon-oxygen reaction, carbon is consumed during the process of deoxidation, so that the total carbon of the final alloy d...

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Abstract

The invention discloses a control method for adjusting the phase composition of cemented carbide bonding phases. Before sintering after forming, the molded or extruded cemented carbide compact is placed in a heater, and the Introduce a certain flow of air, and keep it warm for a certain period of time under preset temperature conditions, so that the oxygen in the air can oxidize with the metal elements in the cemented carbide; the waiting time before the sintering of the product is controlled within 24 hours. Through process improvement and equipment development, the present invention can not only reduce the waiting time before compact sintering, shorten the manufacturing cycle, but also improve the uniformity of magnetic saturation of products and enhance the stability of magnetic saturation between batches.

Description

technical field [0001] The invention relates to the technical field of cemented carbide processing, in particular to a control method for adjusting the cemented carbide binder phase composition. 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 he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/06B22F3/10
CPCB22F3/1007B22F3/1039B22F2999/00C22C1/051C22C29/06B22F2201/50
Inventor 陈成艺李云龙欧培山柯福墨张汉清
Owner XIAMEN GOLDEN EGRET SPECIAL ALLOY