Thermal-stability high-impact-resistance polycrystalline diamond compact and preparing method thereof
A technology of diamond composite sheet and polycrystalline diamond, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of reducing the thermal stability and wear resistance of polycrystalline diamond layer, failure of polycrystalline diamond layer composite sheet, etc., to achieve Reduce the harmful residual stress of the interface, improve the impact resistance and collapse resistance, and improve the drilling efficiency
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[0040] The steps of the preparation method of the heat-stable high impact-resistant polycrystalline diamond composite sheet proposed by the present invention are as follows:
[0041] The first step is to mix double-layer diamond powder with different particle sizes;
[0042] In the second step, the mixed double-layer diamond powder, the cemented carbide substrate 200 with a parallel groove-like interface, and various assembly components are assembled internally and externally to form an external composite mold (internal assembly refers to the use of metal materials) The cup wraps the cemented carbide matrix 200 and diamond powder, and the small parts formed are called the inner composite mold; the outer assembly refers to wrapping the inner composite mold with various salt parts and pyrophyllite blocks, and the small parts formed are called the outer composite mold. );
[0043] The third step is to put the outer synthetic mold into the six-sided top press, and sinter it into a ...
Embodiment 1
[0068] This embodiment is a thermally stable high-impact polycrystalline diamond composite sheet with a diameter of 15.88 mm and a height of 13.22 mm. First, mix the diamond powder of the surface layer and the transition layer: the main particle size of the surface layer powder is 10-20mm, and the main particle size of the transition layer powder is 25-35mm. The mixed double-layer powder is fired at 650-750° C. for 30-90 minutes in a hydrogen atmosphere. Put the fired double-layer powder into the metal cup sequentially according to the ratio of the thickness of the surface layer to 1.0mm and the thickness of the transition layer to 1.5mm, and the cemented carbide substrate with parallel groove interface, and perform internal assembly to obtain the internal composite mold. The inner synthetic mold is subjected to heat treatment at 500-1200° C. for 90-150 minutes in an argon atmosphere. Externally assemble the heat-treated inner composite mold with other assembly components to ...
Embodiment 2
[0074] This embodiment is a thermally stable high-impact polycrystalline diamond composite sheet with a diameter of 15.88 mm and a height of 13.22 mm. First, mix the diamond powder of the surface layer and the transition layer: the main particle size of the surface layer powder is 15-25mm, and the main particle size of the transition layer powder is 35-45mm. The mixed double-layer powder is fired at 650-750° C. for 30-90 minutes in a hydrogen atmosphere. Put the fired double-layer powder into the metal cup sequentially according to the ratio of surface layer thickness of 1.0mm and transition layer thickness of 2.0mm, and cemented carbide substrate with parallel groove interface, and perform internal assembly to obtain an internal composite mold. The inner synthetic mold is subjected to heat treatment at 500-1200° C. for 90-150 minutes in an argon atmosphere. Externally assemble the heat-treated internal composite mold with other assembly components to obtain an external compo...
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Abstract
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