ThO2-contained cobalt-base bonding phase ultrafine hard alloy powder as well as preparation method and application thereof

A cemented carbide and binder phase technology, applied in the field of metal alloys, can solve the problems of difficulty in ensuring the strength of ultra-fine cemented carbide products, poor quality of ultra-fine cemented carbide products, backward research and application, etc., and achieve bending strength. and the effect of improved fracture toughness, low cost and simple preparation process

Active Publication Date: 2013-02-13
GEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-quality ultra-fine cemented carbide powder must be used to prepare ultra-fine cemented carbide, but the research and application in this area in our country are relatively backward
After sintering of ultra-fine cemented carbide, it is easy to produce cobalt pools, and increase the tendency of hard phase grains to aggregate and grow, resulting in poor quality of ultra-fine cemented carbide products and low service life
In addition, pure cobalt powder is used as the binder phase, and the binder phase does not contain dispersed strengthening phase particles, so it is difficult to ensure the strength of the ultrafine cemented carbide product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of WC-10wt% (Co-1wt% ThO 2 )-2wt%TaC-2wt%NbC-1wt%Cr 3 C 2 -1wt% VC powder ultrafine cemented carbide powder.

[0020] 400g of cobalt oxalate (containing cobalt 31wt%) with a Fisher's average particle size of ≤3 μm and ThO with a Fisher's average particle size of ≤1 μm 2 Put 1.24g of powder into a stirring ball mill, and after 30 hours of ball milling, put the ball-milled powder into a hydrogen reduction furnace at 480°C and a hydrogen flow rate of 4m 3 / min, 90 minutes, the powder is reduced to obtain a Fischer average particle size of 0.9μm ultrafine Co-1wt%ThO 2 Powder, used as binder phase for ultrafine cemented carbide.

[0021] The prepared ultrafine Co-1wt%ThO 2 100g of powder, 870g of WC powder with Fischer's average particle size ≤ 1μm, 10g of TaC and NbC powder, 5g of Cr3C2 and VC powder, 400ml / kg of hexane as a ball milling medium, 0.3wt% oleic acid as a dispersant, and 2wt of a forming agent % paraffin together, put into stirring ball mill, ...

Embodiment 2

[0024] Preparation of WC-10wt% (Co-1wt% ThO 2 )-2wt%TaC-2wt%NbC-1wt%Cr 3 C 2 -1wt% VC powder ultrafine cemented carbide powder.

[0025] 400g of cobalt carbonate (containing cobalt 44wt%) with a Fischer mean particle size of ≤ 3 μm and ThO with a Fischer mean particle size of ≤ 1 μm 2 Put 1.76g of powder into a stirring ball mill, and after 30 hours of ball milling, put the ball-milled powder into a hydrogen reduction furnace at 480°C and a hydrogen flow rate of 4m 3 / min, 90 minutes, the powder is reduced to obtain a Fischer average particle size of 0.9μm ultrafine Co-1wt%ThO 2 Powder, used as binder phase for ultrafine cemented carbide.

[0026] The prepared ultrafine Co-1wt%ThO 2 100g of powder, 870g of WC powder with Fibonacci average particle size ≤ 1μm, 10g each of TaC and NbC powder, Cr 3 C 2 And each 5g of VC powder, together with ball milling medium hexane 400ml / kg, dispersant 0.3wt% oleic acid, forming agent 2wt% paraffin, put into agitating ball mill, be 350r...

Embodiment 3

[0029] Preparation of WC-10wt% (Co-1wt% ThO 2 )-15wt%TiC-2wt%TaC-2wt%NbC-1wt%Cr 3 C 2 -1 wt% VC.

[0030]400g of cobalt oxalate (containing cobalt 31wt%) with a Fisher's average particle size of ≤3 μm and ThO with a Fisher's average particle size of ≤1 μm 2 Put 1.24g of powder into a stirring ball mill, and after 30 hours of ball milling, put the ball-milled powder into a hydrogen reduction furnace at 480°C and a hydrogen flow rate of 4m 3 / min, 90 minutes, the powder is reduced to obtain a Fischer average particle size of 0.9μm ultrafine Co-1wt%ThO 2 Powder, used as binder phase for ultrafine cemented carbide.

[0031] The prepared ultrafine Co-1wt%ThO 2 100g of powder, 720g of WC powder, 150g of TiC powder, 10g of each of TaC and NbC powder, Cr 3 C 2 And each 5g of VC powder, together with ball milling medium hexane 400ml / kg, dispersant 0.3wt% oleic acid, forming agent 2wt% paraffin, put into stirring ball mill, be 250rpm with stirring speed through 30 hours stirring ...

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Abstract

The invention provides ThO2-contained cobalt-base bonding phase ultrafine hard alloy powder as well as a preparation method and application thereof. The preparation method comprises the following steps of: firstly preparing ThO2-contained cobalt-base bonding phase ultrafine powder by using stirring ball milling and deoxidization process; and then placing the obtained ThO2-contained cobalt-base bonding phase ultrafine powder together with hard phase WC powder, other carbides, dispersing agent, forming agent, ball milling medium and the like into a stirring ball mill, and carrying out stirring and ball milling for a while to obtain the ThO2-contained cobalt-base bonding phase ultrafine hard alloy powder. The carbides are selected from TiC powder, TaC powder, NbC powder, VC powder and Cr3C2 powder. The preparation method has the advantages of simple process and low cost, and reduces cobalt ponds easily generated by sintering the traditional cobalt-contained materials and the trend of aggregation and growth of alloy crystalline grains, and the ThO2-contained cobalt-base bonding phase ultrafine hard alloy powder has favorable wear resistance, hardness, strength and fracture toughness. The ultrafine powder can be used for preparing high-quality ultrafine hard alloy materials.

Description

technical field [0001] The present invention relates to the field of metal alloys, in particular to ThO-containing 2 Cobalt-based binder phase ultrafine cemented carbide powder and its preparation method and application. Background technique [0002] my country is a big producer of cemented carbide, but not a strong producer of cemented carbide. Compared with the level of developed countries, the quality of cemented carbide products in my country is poor, and most of the products have low performance. They are still primary products with low technical content and low added value, and their service life is short. [0003] Ultrafine cemented carbide has excellent comprehensive properties, and is an important direction of research and development of cemented carbide at home and abroad. The preparation of ultra-fine cemented carbide must use high-quality ultra-fine cemented carbide powder, but my country's research and application in this area are relatively backward. After s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05B22F9/04B22F1/00
Inventor 刘沙许开华
Owner GEM CO LTD
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