A preparation method of diamond sandwich cemented carbide composite button

Abstract

The invention discloses a manufacturing method of a diamond sandwich-type enhanced tungsten carbide composite spherical crown button and belongs to the field of diamond materials. According to the method, a tiny hole with the diameter phi being 1.3-3.0 mm is designed in advance and machined in the center of the section of a conventional enhanced tungsten carbide spherical crown button, then artificial diamond particles and copper alloy mixed powder are loaded into the tiny enhanced tungsten carbide hole through charging and pressing, a high-density compact is formed, then two-stage sintering is carried out, that is, low-temperature brazing and high-temperature curing are carried out, and then the diamond sandwich-type enhanced tungsten carbide composite spherical crown button is obtained. By adopting the tiny enhanced tungsten carbide hole with quite high surface hardness, elasticity modulus and compressive strength as a high-strength and high-rigidity supporting condition of the diamond particles, the rigidity supporting condition that allows all the diamond particles to gain completely stable high load and high three-dimensional strength in three dimensions can be provided, the diamond particles can show high cutting speed and high wear resistance in case of huge cutting force and impact force, the quantity of the diamond particles is remarkably reduced, and the manufacturing method is suitable for large-scale production and low in input.

Description

technical field [0001] The invention belongs to the field of preparation methods of cemented carbide mining tool materials and alloy parts in metal materials, and in particular provides a production method of an artificial diamond sandwich button, that is, at the center of a conventional cemented carbide mining button, the Design and manufacture a central through hole with a diameter d of 1.3-3.0 mm. Then put the mixed powder of artificial diamond particles and copper alloy into the small holes of the button teeth, press it into a high-density compact, and then carry out two-stage sintering treatment, that is, low-temperature brazing and high-temperature curing, and finally prepare a kind of drilling speed and high-temperature solidification. A new type of synthetic diamond sandwich cemented carbide mining drill button with excellent wear resistance. Background technique [0002] my country is a big producer of cemented carbide, with an annual output of more than 8,000 tons...

AI Technical Summary

Problems solved by technology

[0005] 2. Diamond tools must be cooled by water or strong wind to work. Otherwise, because the low-melting point metal heats up and softens quickly, and its expansion coefficient is greater than that of diamond, it is easy to increase the gap between the bezel interface, thereby reducing the strength and losing the bezel. and hard support conditions, diamonds fall off quickly

But this kind of patent is useless, one of the reasons is that the diamond used in this patent is a polycrystalline diamond cylinder, which is actually diamond particles packed into a pyrophyllite mold and then reheated under high temperature and ultra-high pressure. Diamond polymer synthesized by hot pressing, the minimum diameter of the diamond cylinder required by this patent is 1mm, the minimum height is 1mm, and the maximum size is φ30×50mm

But in fact, the polycrystal with a size of φ5mm×5mm is already a gem-grade thing, not to mention whether the surface of the polycrystal cylinder is smooth, flat, and whether there are polycrystalline interface defects, etc. According to this patent, the diameter tolerance of the cylinder must reach ± 0.05mm, which is impossible to achieve; the second is that the patent requires that the interference between the polycrystalline diamond cylinder and the central aperture of the button is between 0.01 and 0.05mm. How about the original surface state and original size tolerance of the artificial diamond polycrystal? How far is it from what the patent requires? Obviously, the inventor of the patent has no actual knowledge

However, the cylinder produced by the actual high-pressure polycrystalline is very irregular, the surface is also very rough, and it is very difficult to process and grind. In order to ensure the fracture brittleness of the material, it has been proved that the diamond cylinder has already broken during the interference assembly.

Explain that this patent has no use value,

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