Method for preparing cemented carbide
A technology of cemented carbide and metal powder, which is used in the manufacture of tools, turning equipment, milling equipment, etc.
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Embodiment 1
[0057] Embodiment 1 (the present invention)
[0058] Powders having the composition by weight % as shown in Table 1, prepared from γ-phase-containing cemented carbide scrap recovered through the Zn recovery process, were pre-ground in a ball mill for 100 hours. The pre-milled grain size was measured to be 0.7 μm using a laser diffraction apparatus called Microtrac 3000S operating in absorption mode and measurements were carried out in water, ie the powder was in the form of a slurry.
[0059] Table 1
[0060]
co
Ta
Ti
Nb
Cr
Fe
Ni
C
O
N
first part
8.80
2.25
1.66
0.64
0.08
0.05
0.02
5.75
0.24
0.06
[0061] The pre-milled fraction was mixed with virgin WC stock fraction with a grain size of 5 μm (FSSS), and (Ti 0.85 W 0.15 )C, (Ta 0.8 Nb 0.2 )C and Ti(C 0.5 N 0.5 ) were added as individual carbides together with binder metal Co powder in wt % amounts as shown in Table 2 to match the ...
Embodiment 2
[0069] Embodiment 2 (prior art)
[0070] Unused WC raw materials with a grain size of 5 μm, prealloyed cubic carbide raw materials (Ta, Ti, Nb, W) with a weight fraction of Ta / Ti / Nb / W of 31 / 20 / 5 / 34 ( C, N) and Co powders were mixed to match the resulting overall total elemental composition as shown in Table 4 by weight %. An organic binder, which is polyethylene glycol, was also added in an amount of 2% by weight, the amount of organic binder not being included in the total volume of the dry powder. The total material volume was mixed by using a ball mill milling operation for 12 hours to form a homogeneous slurry blend. The slurry is then dried in a spray-dryer to a powder ready to be pressed.
[0071] Table 4
[0072] W
co
Ta
Ti
Nb
C
O
N
81.4
7.5
2.7
1.8
0.4
6.04
0.04
0.09
[0073] Cemented carbide blanks were pressed in CNMG120408 ISO insert geometry from the resulting ready-to-press powder and sintere...
Embodiment 3
[0075] Embodiment 3 (comparison)
[0076] The virgin WC raw material with a grain size of 5 μm, the binder metal Co powder and the PRZ material with the composition shown in Table 1 that had been recovered according to the zinc treatment method, and (Ti 0.85 W 0.15 )C, (Ta 0.8 Nb 0.2 )C and Ti(C 0.5 N 0.5 ) of virgin cubic carbide powder, added as individual carbides in an amount by weight % as indicated in Table 5. No pre-grinding step was performed on the recovered PRZ powder. The PRZ material has a grain size of 3 μm as measured using a laser diffraction apparatus called Microtrac 3000S operating in absorption mode and carrying out the measurements in water, ie the powder is in the form of a slurry. The powders were mixed to match the resulting overall elemental composition as shown in Table 6 by weight %. An organic binder which is polyethylene glycol was also added in an amount of 2% by weight, the amount of organic binder not included in the total volume of the ...
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