Nickel-based alloy powder for laser cladding and preparation method thereof

Abstract

The invention discloses a nickel-based alloy powder for laser cladding. The powder comprises the following components of, in percentage by mass, 19-22% of Cr, 1-2% of Cu, 2-4% of Al, 1-3% of Ti, 3-5%of W, 6-8% of Mo, 0.3-0.6% of C, 0.5-1.5% of B, and the balance Ni. The nickel-based alloy powder is prepared by adopting a medium-frequency induction furnace-inert gas atomization method. The melt obtained after the nickel-based alloy powder cladding has good wettability, the structural stress and the thermal stress generated in the rapid cooling process of the melt are small, a large-area lasercladding layer with high thickness can be obtained without preheating and subsequent heat treatment, and the cladding layer is not cracked; and in addition, a Ni base body itself has good corrosion resistance, Cr, Al, and Ti elements can form a compact passivation film on the surface of the base body, so that the cladding layer obtained after cladding not only has excellent high-temperature wear resistance, but also has good high-temperature corrosion resistance.

Description

technical field [0001] The invention relates to an alloy plating material, in particular to a nickel-based alloy powder for laser cladding, and to a preparation method thereof. Background technique [0002] In mining, metallurgy, chemical industry, energy and other industries, many key parts fail due to wear and corrosion due to long-term harsh working environments, and most of the failure forms occur on the surface of the material. Laser cladding is an emerging technology with development potential. Under the irradiation of high-energy-density laser beams, the surface layer of the substrate and the added alloy are simultaneously melted to form a surface melting layer with a thickness of about 10-1000 μm. After the melted layer is rapidly solidified, a layer of cladding layer whose composition, structure and performance are different from the base material is obtained. Using this cladding layer, the surface of the substrate can be modified to meet special surface performanc...

AI Technical Summary

Problems solved by technology

Taking self-fluxing alloy powders in metal powders as an example, the most representative ones are nickel-based, cobalt-based, and iron-based powders. Although the price of iron-based alloy powders is relatively low, their properties are not as good as those of nickel-based and cobalt-based alloys. Powder, cobalt-based alloy powder has the best high temperature resistance, wear resistance and corrosion resistance, but the price is relatively high in the current market, and it is easy to increase production costs. Nickel-based powder has better heat resistance and corrosion resistance but lower high temperature resistance. Poor, the price is more moderate

Therefore, the research on nickel-based alloy powder is more in-depth, but these powders are mainly aimed at the room temperature application performance of the material, and cannot meet the requirements of high temperature application performance. The method involves nickel-based ceramic alloy powder, and the composition is 12% to 15% of titanium carbide, 0.2% to 0.5% of carbon, 4% to 7% of calcium fluoride, 3% to 6% of silicon nitride, 2% to 5% % boron, 2% to 4% molybdenum, 2% to 6% iron, 0.5% to 1% manganese, the balance of nickel and an appropriate proportion of indium oxide (In 2 o 3 ), rare earth (CeO 2 ), the alloy powder is only for the modification of the surface of the screw, it cannot be inferred that it can be applied to the surface of other substrates, and it lacks the description of high-temperature performance; Chinese patent application CN201710268108.2 discloses an alloy coating for laser cladding Layer, composed of Al: 4-8%, Fe: 20-23%, Cr: 18-23%, Co: 18-22%, Ni: 20-23%, Ti: 6-10%, but it is a A high-entropy alloy is required to be composed of 5 or more components in an equimolar ratio. To obtain the desired performance, the ratio requirements of the high-entropy alloy must be strictly met, and there is no description of its high temperature resistance and wear resistance when used. performance improvement

At present, it is difficult to find iron-based or nickel-based alloy powders on the market that meet the wear resistance, corrosion resistance and thermal fatigue properties under high temperature (300-700°C) conditions.

Although some brands of cobalt-based alloy powder can meet the performance requirements, the high price of cobalt-based alloy powder seriously restricts the promotion and application of laser cladding technology and the development and progress of related industries

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