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Al2O3-cobalt-based adhesive phase-containing ultrafine hard alloy powder and preparation method and use thereof

A cemented carbide and ultra-fine powder technology, applied in the field of metal alloys, can solve the problems of inability to achieve the comprehensive effect of corrosion resistance, difficult to achieve uniform distribution of inhibitors, and reduced alloy properties, so as to improve the uniformity of particle distribution and reduce the reaction. Activation energy, the effect of enhancing the activity of powder

Active Publication Date: 2012-12-26
GEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As pointed out in the patent background technology: due to the easy growth of WC grains during liquid phase sintering, this has caused difficulties in the preparation of ultrafine cemented carbide. For this reason, people have used nickel as a bonding metal or added chromium to improve Corrosion resistance, and once added inhibitors (Cr 3 C 2 , TaC and VC) or a new sintering method to inhibit grain growth, but none of them can achieve the comprehensive effect of improving corrosion resistance and refining grains. On the contrary, adding grain growth inhibitors will reduce the performance of the alloy. And the finer the powder, the more difficult it is to achieve a uniform distribution of the inhibitor, which will cause the abnormal growth of the WC grain

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare WC-10wt% (Co-1wt%Al 2 o 3 )-2wt%TaC-2wt%NbC-1wt%Cr 3 C 2 -1wt% VC powder ultrafine cemented carbide powder.

[0023] 400g of cobalt oxalate (containing 31wt% cobalt) with a Fisher's average particle size of ≤3 μm and Al with a Fisher's average particle size of ≤1 μm 2 o 3 Put 1.24g of powder into a planetary high-energy 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%Al 2 o 3 Powder, used as binder phase for ultrafine cemented carbide.

[0024] The prepared ultrafine Co-1wt%Al 2 o 3100g 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 ...

Embodiment 2

[0027] Prepare WC-10wt% (Co-1wt%Al 2 o 3 )-2wt%TaC-2wt%NbC-1wt%Cr 3 C 2 -1wt% VC powder ultrafine cemented carbide powder.

[0028] 400g of cobalt carbonate (containing cobalt 44wt%) with a Fischer mean particle size of ≤ 3 μm and Al with a Fischer mean particle size of ≤ 1 μm 2 o 3 Put 1.76g of powder into a planetary high-energy 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%Al 2 o 3 Powder, used as binder phase for ultrafine cemented carbide.

[0029] The prepared ultrafine Co-1wt%Al 2 o 3 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 agitati...

Embodiment 3

[0032] Prepare WC-10wt% (Co-1wt%Al 2 o 3 )-15wt%TiC-2wt%TaC-2wt%NbC-1wt%Cr 3 C 2 -1 wt% VC.

[0033] 400g of cobalt oxalate (containing 31wt% cobalt) with a Fisher's average particle size of ≤3 μm and Al with a Fisher's average particle size of ≤1 μm 2 o 3 Put 1.24g of powder into a planetary high-energy 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%Al 2 o 3 Powder, used as binder phase for ultrafine cemented carbide.

[0034] The prepared ultrafine Co-1wt%Al 2 o 3 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 agitating ball mill, be 250rpm through 30 hours agitat...

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Abstract

The invention provides Al2O3-cobalt-based adhesive phase-containing ultrafine hard alloy powder and a preparation method and use thereof. In the invention, Al2O3-cobalt-based adhesive phase-containing ultrafine powder is first prepared by using a planetary high-energy ball mill and a reduction process, then the Al2O3-cobalt-based adhesive phase-containing ultrafine powder is filled into a stirring ball mill together with hard alloy phase WC powder, other carbides, a dispersant, a forming agent, a ball milling medium and the like , and after a period of stirring, the Al2O3 -cobalt-based adhesive phase-containing ultrafine hard alloy powder is obtained. The carbide powder may be TiC, TaC, NbC, VC and Cr3C2 powder. In the invention, the process is simple, the cost is low, the tendency of production of cobalt pool and aggregation and growth of alloy grains after the conventional cobalt-containing powder material is sintered is changed, and the Al2O3-cobalt-based adhesive phase-containing ultrafine hard alloy powder has high wear resistance, hardness, strength and fracture toughness. The ultrafine powder provided by the invention can be used to prepare high-quality ultrafine hard alloy materials.

Description

technical field [0001] The invention relates to the field of metal alloys, in particular to Al-containing 2 o 3 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. [0004] At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/00B22F1/00C22C1/05C22C29/00
Inventor 刘沙许开华
Owner GEM CO LTD
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