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
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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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