A double-sided heat-resistant polycrystalline diamond composite sheet and its preparation process
The invention relates to a polycrystalline diamond and a preparation process technology, which is applied to the field of double-sided heat-resistant polycrystalline diamond composite sheets and their preparation technology, which can solve the problem of low heat resistance of ordinary polycrystalline diamond composite sheets, and achieve high hardness, strong toughness, The effect of enhancing the binding force
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Embodiment 1
[0036] A preparation process for a double-sided heat-resistant polycrystalline diamond composite sheet, comprising the following steps:
[0037] 1) Cobalt removal on the surface of the cemented carbide substrate: wrap the polytetrafluoroethylene protective material on the side of the cemented carbide substrate, and then place it on the HNO 3 :H 2 Etch in a solution with a volume ratio of O of 1:2.5 for 30 min, take out the cemented carbide substrate and wash it with ion water to neutrality to obtain a cemented carbide substrate with decobalt on the upper and lower surfaces, and the thickness of the decobalt layer on the upper and lower surfaces Both are 100 μm, and the cobalt content of the decobaltized layer is 1.2% (weight percent);
[0038] The cemented carbide substrate is composed of 90% WC powder, 9% Co powder and 1% Ce powder composed of the following raw materials by weight percentage. The particle size of the WC powder is 0.8µm, and the specification of the cemented ...
Embodiment 2
[0053] A preparation process for a double-sided heat-resistant polycrystalline diamond composite sheet, comprising the following steps:
[0054] 1) Cobalt removal on the surface of the cemented carbide substrate: wrap the polytetrafluoroethylene protective material on the side of the cemented carbide substrate, and then place it on the HNO 3 :H 2 O volume ratio is 110min in the solution of 1: 3, takes out cemented carbide substrate and rinses to neutrality with ion water, obtains the cemented carbide substrate of upper and lower surface cobalt removal, the thickness of the decobalt layer of upper and lower surface is equal to 200 μm, the cobalt content on the surface of the decobaltized layer is 1.5% (weight percent);
[0055] The cemented carbide substrate is composed of 92.5% WC powder, 7% Co powder and 0.5% Ce powder composed of the following weight percentages. The particle size of the WC powder is 1.2µm, and the specification of the cemented carbide substrate is φ45mm×2....
Embodiment 3
[0070] 1) Cobalt removal on the surface of the cemented carbide substrate: wrap the polytetrafluoroethylene protective material on the side of the cemented carbide substrate, and then place it on the HNO 3 :H 2 Etch in a solution with O volume ratio of 1:2.75 for 70 min, take out the cemented carbide substrate and rinse it with ionized water until neutral to obtain a cemented carbide substrate with decobalt on the upper and lower surfaces, and the thickness of the decobalt layer on the upper and lower surfaces Both are 150 μm, and the cobalt content on the surface of the decobaltized layer is 1.4% (weight percent);
[0071] The cemented carbide substrate is composed of the following raw materials in weight percentage: 91.25% WC powder, 8% Co powder and 0.75% Ce powder. The particle size of the WC powder is 1µm, and the specification is φ45mm×2.0mm.
[0072] 2) Titanium coating on the surface of diamond micropowder: TiO 2 , MgO, NaCl and Al are mixed in a mass ratio of 40:23....
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