Cobalt-based metal ceramic alloy powder exclusively used in laser cladding of surface of drill bit

Abstract

The invention discloses cobalt-based metal ceramic alloy powder exclusively used in laser cladding of the surface of a drill bit. The cobalt-based metal ceramic alloy powder is composed of the following ingredients in percentage by weight: 10-15% of tungsten carbide, 0.1-0.3% of carbon, 5-7% of calcium fluoride, 2-4% of silicon nitride, 3-5% of boron, 15-18% of chromium, 1-3% of silicon, 7-9% of iron, 18-22% of molybdenum, and the balance of cobalt. The cobalt-based metal ceramic alloy powder is exclusively used in laser cladding of the drill bit, improves the metal structure density of the drill bit, reduces the defects such as gas pores, cracks and shrinkage cavities of the cladding layer, and improves the wearing resistance, strength, rigidity, impact resistance and heat resistance of the drill bit.

Description

technical field [0001] The invention relates to an alloy powder, in particular to a cobalt-based cermet alloy powder specially used for laser cladding on the surface of a drill bit. Background technique [0002] Laser has the characteristics of high brightness, high directionality, high monochromaticity and high coherence, and is now being used in more and more fields. Laser cladding is one of the surface treatment technologies. In a nutshell, the principle of laser cladding is to use high-energy laser beams to irradiate the surface of metal materials, the surface of the substrate is melted rapidly, the liquid metal forms a small-scale molten pool, and new powder materials are filled at the same time. , the original metal material is mixed with the added powder to form a new layer of liquid metal. After the laser beam passes through, the liquid metal layer is rapidly cooled to form a solid cladding layer on the metal surface. However, the working environment of the drill b...

AI Technical Summary

Problems solved by technology

However, the working environment of the drill bit is harsh, and the ordinary drill bit has low hardness, is easy to wear, and has poor impact resistance.

However, when the metal powder specially used for laser cladding of drill bits is actually used, the heat transfer and melting are not uniform, and the fusion degree between the new metal powder and the base material is poor, resulting in a series of cracks, shrinkage porosity, shrinkage cavity, and pores. Undesirable consequences, and the effect of improving the mechanical properties of the drill bit is not ideal

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