Laser-cladding cobalt-based alloy powder and method for preparing same

Abstract

The invention relates to laser-cladding cobalt-based alloy powder and a method for preparing the same and is characterized in that the cobalt-based alloy powder comprises, by mass, 0.1% to 0.4% of C, 3.5% to 5.5% of Si, 1.5% to 3% of B, 1.6% to 2.5 % of Mn, 1.0% to 3.0% of Cr, 0.5% to 2% of W, 0.5% to 3% of Ni, 0.1% to 0.4% of Nb, less than 15% of Fe, 0.2% to 0.3% of La2O3, 0.4% to 0.5% of rare earth Y, and the balance Co and inevitable impurity elements. A technological process for manufacturing the laser-cladding cobalt-based alloy powder includes compounding, smelting, atomizing, drying and screening. The laser-cladding cobalt-based alloy powder is corrosion resistant and high in rigidity, and a laser-cladding layer after treatment has the advantages of being free of cracks, air holes and impurities, compact in organization, fine in crystalline grain and the like. The laser-cladding cobalt-based alloy powder and the method for preparing the same have the advantages that a laser-cladding alloy layer of a large area and thickness and free of cracks can be obtained under the condition that preheating and subsequent heat treatment are not needed, the cladding layer is high in strength, rigidity and abrasion resistance, the plastic toughness is good, the cost is low and the like.

Description

technical field [0001] The invention belongs to the technical field of cobalt-based alloys, and relates to a laser cladding alloy powder and a preparation method thereof, in particular to a laser cladding cobalt-based alloy powder and a preparation method thereof. The cobalt-based alloy powder is suitable for laser cladding. Background technique [0002] Wear and tear generally occurs on the surface of machine parts. At present, it is a relatively new method to improve the wear resistance of machine parts through surface engineering technology. Among these new technologies, laser cladding is a high-tech in the field of modern surface engineering technology. Optical cladding technology refers to placing selected coating materials on the substrate to be clad by different addition methods. After being irradiated by laser, it melts with the surface of the substrate and forms a low-dilution coating with the substrate after rapid solidification. Metallurgically bonded surface coat...

AI Technical Summary

Problems solved by technology

In recent years, some researchers have obtained some iron-based alloy powders for laser cladding, but these powders still have certain limitations. For example, in order to make the laser cladding layer have high hardness and wear resistance, the carbon content in the powder is too high ( % by weight>0.65%) leads to low plasticity and toughness of the laser cladding layer, and the cladding layer is easy to crack when laser cladding a large area and thick iron-based alloy. Another example is to make the laser cladding layer have high plasticity and toughness. Too low carbon content (weight % 20%), which significantly increases the cost of the powder, and is likely to increase the cold crack sensitivity of the laser cladding layer

In short, the thermal spray alloy powders currently used in laser cladding and the iron-based alloy powders specially developed for laser cladding in recent years have considerable limitations.

However, it is limited in application in many occasions, especially in laser cladding, which affects the application of laser technology in the field of modern surface engineering technology.