Dispersing agent of superfine hard alloy raw material powder
A technology of cemented carbide and dispersant, which is applied in the field of dispersant, can solve the problems of uneven structure of ultra-fine cemented carbide, achieve the effect of stabilizing the mixture and improving the performance of pressing and forming
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Embodiment 1
[0010] Example 1: WC, Co, VC, Cr3C2 with a BET particle size of 0.20um are formulated into a 1kg compound in a mass ratio of 90%: 9%: 0.5%: 0.5%, using alcohol as a grinding medium, and 2% forming agent PEG4000 (the same as in the following examples), and adding 0.05% oleic acid and 0.05% Tween-80 of the mixture, the above-mentioned materials were wet-milled for 80 hours, the ball-to-material ratio was 5: 1, then dried and pressed into shape And 1410° low-pressure sintering to obtain ultra-fine cemented carbide. The physical properties of the superfine cemented carbide prepared under the above-mentioned conditions are listed in table 1, figure 1 Its electron microscope photograph. Table 1 has also listed under the above-mentioned conditions, but does not add the physical property of the superfine cemented carbide of dispersant of the present invention, Figure 4 Under the above-mentioned conditions, but do not add the electron micrograph of the superfine cemented carbide of ...
Embodiment 2
[0011] Embodiment 2: Add 0.1% oleic acid and 0.2% Tween-80 of powder quality in 1Kg compound material, above-mentioned material carries out the wet grinding of 80 hours, and ball material ratio is 5: 1, then through drying, compression molding And 1410° low-pressure sintering to obtain ultra-fine cemented carbide. The physical properties of the superfine cemented carbide prepared under the above-mentioned conditions are listed in table 1, figure 2 Its electron microscope photograph.
Embodiment 3
[0012] Embodiment 3: Add 0.2% oleic acid and 0.4% Tween-80 of powder quality in 1Kg compound material, above-mentioned material carries out 80 hours of wet milling, and ball material ratio is 5: 1, then through drying, compression molding And low-pressure sintering at 1410 degrees to obtain ultra-fine cemented carbide. The physical properties of the alloys under the above conditions are listed in Table 1, image 3 Electron micrographs of alloys under the above conditions.
[0013] Table 1
[0014]
[0015] From Table 1 and Figure 1~4 It can be seen from the figure that after adding the dispersant of the present invention, the microstructure of ultrafine cemented carbide is more uniform, and the bending strength and hardness are improved, especially the bending strength, which can be increased by 25% at most.
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