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A kind of preparation method of wc-co cemented carbide carbon content correction

A technology of cemented carbide and carbon content, which is applied in the field of cemented carbide preparation, can solve the problems of unstable performance of alloy materials, and achieve the effect of improving quality and stability.

Active Publication Date: 2018-09-11
HUNAN CENTURY SPECIAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the technical problem of unstable performance of alloy materials caused by decarburization and carburization in the existing cemented carbide sintering process, the present invention provides a carbon-corrected sintering method for WC-Co cemented carbide, aiming at balancing Sintering decarburization and carburizing to improve the performance of cemented carbide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Choose YG06 grade for normal sintering and carbon correction sintering comparison:

[0035]When batching, prepare two mixtures according to the carbon content of 6.10% (lower than the theoretical standard carbon content of 6.128%) and 6.13%, respectively, and obtain 100 pieces of compacted green bodies through wet grinding, spray drying and compression molding;

[0036] Step (1): Place the green body in an integrated sintering furnace, raise the temperature from room temperature to 300°C at a rate of 3°C / min, and then keep it warm for 30 minutes, during which time H2 is introduced at a rate of 40L / min; The heating rate of min was raised to 450°C for 80 minutes, during which H2 was fed at a rate of 60L / min; then the heating rate was raised to 600°C at a rate of 2°C / min for 80 minutes, and H2 was fed at a rate of 40L / min during this period; Complete the degreasing step;

[0037] Step (2) Carry out carbon content correction under a mixed atmosphere of CH4:H2 ratio of 1:99...

Embodiment 2

[0042] Choose YG08 grade for normal sintering and carbon correction sintering comparison:

[0043] When batching, prepare two kinds of mixtures according to the carbon content of 6.07% (lower than the theoretical standard carbon content of 6.128%) and 6.15%, respectively, and obtain 100 pieces of compacted green bodies through wet grinding, spray drying and compression molding;

[0044] Step (1): Place the green body in an integrated sintering furnace, raise the temperature from room temperature to 300°C at a rate of 3°C / min, and then keep it warm for 30 minutes, during which time H2 is introduced at a rate of 40L / min; The heating rate of min was raised to 450°C for 80 minutes, during which H2 was fed at a rate of 60L / min; then the heating rate was raised to 600°C at a rate of 2°C / min for 80 minutes, and H2 was fed at a rate of 40L / min during this period; Complete the degreasing step;

[0045] Step (2) Carry out carbon correction at 600-1000°C in a mixed atmosphere of CH4:H2 ...

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Abstract

The invention provides a carbon content correction preparation method of WC-Co hard alloy. The WC-Co hard alloy is prepared by conducting wet grinding, drying, forming agent mixing, press forming, forming agent removing and sintering after material mixing. In the gradient sintering process, heat preservation is conducted for 25-35 min after the temperature reaches 300 DEG C to 320 DEG C; the temperature is increased to 400 DEG C to 500 DEG C at the hydrogen flow rate of 55-65 L / min, and heat preservation is conducted for 70-90 min; the temperature is increased to 550 DEG C to 650 DEG C at the hydrogen flow rate of 35-45 L / min, heat preservation is conducted for 70-90 min, and degreasing is completed; carbon content correction is conducted in a mixed atmosphere with the CH4-H2 ratio of (1-2):(98-99) at the hydrogen flow rate of 35-45 L / min at the temperature ranging from 600 DEG C to 1,000 DEG C; heat preservation is conducted in a mixed atmosphere with the CH4-H2 ratio of (1-4):(96-99) at the temperature ranging from 1,000 DEG C to 1,200 DEG C for precise carbon content correction; the hard alloy is obtained after sintering treatment. According to the carbon content correction preparation method of the WC-Co hard alloy, by controlling special temperature increasing curves and air flow and the flow rate in the process, decarburization and carburization can be effectively balanced, and then the quality stability of the product prepared through sintering is improved.

Description

technical field [0001] The invention relates to a method for preparing a hard alloy, in particular to a method for preparing a WC-Co hard alloy, specifically performing carbon content correction during the sintering process. Background technique [0002] Cemented carbide is one or more high hardness, high modulus refractory metal carbides (WC, Ti C, Cr 2 C 3 ) is a multiphase composite material composed of transition metals (Fe, Co, Ni, etc.) or other alloys as the binder phase. This kind of composite structural material has the high hardness, high wear resistance, and red hardness of ceramics, as well as the high strength and toughness of metals; and this specific "double high" performance is exactly the goal pursued by material researchers. [0003] Tungsten carbide-cobalt is a good example of "double high" cemented carbide or cermet. Its grade is composed of YG and the percentage of average cobalt content. For example, YG8 means tungsten-cobalt cemented carbide with a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/08B22F3/10B22F3/14
CPCB22F3/101B22F3/1021B22F3/14B22F2999/00C22C1/051C22C29/08B22F2201/013B22F2201/30B22F2201/20
Inventor 肖华单麒铭
Owner HUNAN CENTURY SPECIAL ALLOY