Method for preparing ultrafine cemented carbide by taking nano WC-6Co composite powder added with Co powder as raw materials

A technology of composite powder and cemented carbide, which is applied in the field of preparation of ultra-fine cemented carbide rods, can solve the problems of low strength of cemented carbide, and achieve the effects of good compression molding performance, uniform particle size and high density

Active Publication Date: 2018-06-15
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low strength of cemented carbide prepared with nano WC-Co composite powder, the present invention provides a method for preparing superfine cemented carbide with WC-6Co composite powder added with Co powder as raw material, aiming at Obtain high-strength, high-hardness, high-density cemented carbide rods

Method used

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  • Method for preparing ultrafine cemented carbide by taking nano WC-6Co composite powder added with Co powder as raw materials
  • Method for preparing ultrafine cemented carbide by taking nano WC-6Co composite powder added with Co powder as raw materials
  • Method for preparing ultrafine cemented carbide by taking nano WC-6Co composite powder added with Co powder as raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1) Alcohol wet grinding of ingredients

[0056] Take Co-coated WC nano-WC-6Co composite powder with a grain size of ≤200nm and a Co mass content of 6%, and mix it with a cemented carbide mixture with a Co content of 8.5% (WC-8.5Co);

[0057] Add 234.9kg of nano WC-6Co composite powder to a 300L tiltable rolling ball mill, add 5.1Kg of Co powder with a particle size of FSSS of 0.95μm, and add 0.72Kg of grain growth inhibitor VC, Cr 3 C 2 1.92Kg, add 2.4Kg of binder paraffin, add 15L of oleic acid, 60Kg of alcohol, and finally add ball mill rods Φ6×20mm, Φ8×20mm, Φ12×20mm, Φ16×16mm, Φ20×10mm, a total of 1200kg, ball mill for 48h, and obtain Ball mill slurry.

[0058] The SEM image of the raw material nano WC-6Co composite powder used in this example is as follows figure 2 As shown, it can be seen that the grain size of the raw material is small and uniform.

[0059] The XRD pattern of the raw material nano WC-6Co composite powder used in this example is as follows ...

Embodiment 2

[0090] 1) Alcohol wet grinding of ingredients

[0091] Take Co-coated WC nano-WC-6Co composite powder with a grain size of ≤200nm and a Co mass content of 6%, and mix it according to the cemented carbide mixture with a Co content of 9% (WC-9Co):

[0092] Add 232.34kg of nano-WC-6Co composite powder to a 300L tiltable rolling ball mill, add 7.66Kg of Co powder with a particle size of FSSS of 0.95μm, and add 0.72Kg of grain growth inhibitor VC, Cr 3 C 2 1.92Kg, add 2.4Kg of binder paraffin, add 15L of oleic acid, 60Kg of alcohol, and finally add ball mill rods Φ6×20mm, Φ8×20mm, Φ12×20mm, Φ16×16mm, Φ20×10mm, a total of 1200kg, ball mill for 52h, and obtain Ball mill slurry.

[0093] 2) Spray granulation

[0094] Add 12Kg alcohol to wet grinding for 10min in the obtained ball mill slurry in step 1), discharge the material through a 325 mesh sieve, and heat while stirring to prevent the paraffin from separating out;

[0095] The stirred slurry is passed through the closed spra...

Embodiment 3

[0116] 1) Alcohol wet grinding of ingredients

[0117] Take Co-coated WC nano-WC-6Co composite powder with a grain size of ≤200nm and a Co mass content of 6%, and mix it according to the cemented carbide mixture with a Co content of 10% (WC-10Co):

[0118] Add 229.78kg of nano-WC-6Co composite powder to a 300L tiltable rolling ball mill, add 10.22Kg of Co powder with a particle size of FSSS of 0.95μm, and add 0.48Kg of grain growth inhibitor VC, Cr 3 C 2 2.16Kg, add 2.4Kg of paraffin wax as a binder, add 15L of oleic acid, 60Kg of alcohol, and finally add ball mill rods Φ6×20mm, Φ8×20mm, Φ12×20mm, Φ16×16mm, Φ20×10mm, a total of 1200kg, ball mill for 60h, and obtain Ball mill slurry.

[0119] 2) Spray granulation

[0120] Add 12Kg alcohol to wet grinding for 10min in the obtained ball mill slurry in step 1), discharge the material through a 325 mesh sieve, and heat while stirring to prevent the paraffin from separating out;

[0121] The stirred slurry is passed through the...

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Abstract

The invention discloses a method for preparing ultrafine cemented carbide by taking nano WC-6Co composite powder added with Co powder as raw materials. According to the method, by taking the nano WC-6Co composite powder as the raw materials, the Co powder, inhibitors and paraffin are added to the raw materials; through alcohol wet grinding and spray granulation, cemented carbide mixtures of whichthe Co content is 8%-15% are obtained; and then, by taking the cemented carbide mixtures as raw materials, through the working procedures of kneading by mixing forming agents, extrusion forming, blankdrying and pressure sintering, ultrafine cemented carbide rods are prepared. The ultrafine cemented carbide prepared with the method disclosed by the invention has the advantages of high strength, hardness and density, small WC grains, uniform grain size, and high resistance to plastic deformation.

Description

technical field [0001] The invention belongs to a method for preparing superfine hard alloy rods, which is a method for preparing high-strength and high-hardness superfine hard alloy rods by using nanometer WC-Co composite powder as a raw material and adding metal Co powder. The high-strength, high-hardness ultra-fine carbide rods prepared by this method can be processed into drill bits or milling cutters, which are used in heat treatment ≥HRC65 stainless steel materials, printed circuit boards (PCB), aluminum alloys, graphite, non-ferrous metals and carbon fibers Reinforced plastics, etc. Background technique [0002] In order to meet the requirements of high integration, lightness, miniaturization, impact resistance, electromagnetic shielding, and heat dissipation of 3C products, at the same time, the number of layers of the main board (PCB) of 3C products is increasing, and the diameter of tiny holes in the PCB is increasing. Smaller, corresponding to the increasing thic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10B22F3/20B22F3/14B22F9/04
Inventor 朱二涛张久兴杨新宇
Owner HEFEI UNIV OF TECH
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