Special cobalt-based metal ceramic alloy powder for optical fiber laser cladding
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A fiber laser and ceramic alloy technology, applied in the coating process and coating of metal materials, can solve the problems of uneven heat transfer and melting, shrinkage porosity, cracks, etc., and achieve excellent metallurgical properties, compact structure, and thermal conductivity. good performance
Active Publication Date: 2012-08-29
CHANGZHOU TIANZHENG IND DEV CO LTD
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If the alloy powder originally suitable for carbon dioxide laser cladding is directly used for fiber laser cladding, due to the great change of the wavelength of the laser, the physical process of the alloy powder being radiated by heat and heat conduction will be greatly changed. Inhomogeneous heating and melting, resulting in a series of adverse consequences such as cracks, shrinkage porosity, shrinkage cavities, and pores
Therefore, many alloy powders originally suitable for carbon dioxide laser cladding cannot be directly used for fiber laser cladding, and it is necessary to prepare a cermet alloy powder specially used for fiber laser cladding
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Embodiment 1
[0021] 10 grams of carbon, 10 grams of silicon, 20 grams of iron, 15 grams of nickel, 30 grams of molybdenum, 80 grams of chromium, 30 grams of tungsten, 130 grams of tungsten carbide, 20 grams of calcium fluoride, 10 grams of silicon nitride, 645 grams of cobalt, After thorough mechanical mixing, a cobalt-based cermet alloy powder with a particle size of 30-65 micrometers (μm) is obtained.
Embodiment 2
[0023] 20 grams of carbon, 20 grams of silicon, 40 grams of iron, 25 grams of nickel, 40 grams of molybdenum, 120 grams of chromium, 40 grams of tungsten, 170 grams of tungsten carbide, 30 grams of calcium fluoride, 20 grams of silicon nitride, 475 grams of cobalt, After thorough mechanical mixing, a cobalt-based cermet alloy powder with a particle size of 30-65 micrometers (μm) is obtained.
Embodiment 3
[0025] 15 grams of carbon, 15 grams of silicon, 30 grams of iron, 20 grams of nickel, 35 grams of molybdenum, 100 grams of chromium, 35 grams of tungsten, 150 grams of tungsten carbide, 25 grams of calcium fluoride, 15 grams of silicon nitride, 560 grams of cobalt, After thorough mechanical mixing, a cobalt-based cermet alloy powder with a particle size of 30-65 micrometers (μm) is obtained.
[0026] The cobalt-based metal-ceramic alloy powder prepared in Example 3 was used with a 1.5-kilowatt fiber laser with a spot size of 10 mm. 2 , the traveling speed is 2mm / s, and the powder spraying rate is 8g / min. After laser cladding is performed on the surface of the workpiece whose base material is No. 45 steel, the obtained data and performance indicators are as follows:
[0027] Tensile strength of fiber laser cladding cermet alloy tensile specimen at room temperature: [σ]=1200MN / m 2 , the section shrinkage of the fiber laser cladding cermet alloy tensile specimen: Ψ=7%, and the f...
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Abstract
The invention discloses special cobalt-based metal ceramic alloy powder for optical fiber laser cladding, which is matched with characteristics of optical fiber laser. The special cobalt-based metal ceramic alloy powder contains the following components by weight percent: 1-2% of carbon, 1-2% of silicon, 2-4% of iron, 1.5-2.5% of nickel, 3-4% of molybdenum, 8-12% of chromium, 3-4% of tungsten, 13-17% of tungsten carbonate, 2-3% of calcium fluoride, 1-2% of silicon nitrate and cobalt for the rest. The metal ceramic alloy powder is specially applied to a cladding process of a high-energy optical fiber laser device, a metal ceramic cladding layer with high hardness, high flexibility and high corrosion resistance can be formed on the surface of a work die of a steel and iron basis material, and the cladding layer is compact in structure, has no defects such as air holes, cracks, shrinkage cavities and the like, and has excellent metallographic performance such as high hardness, high plasticity, flexibility and corrosion resistance, and the like; moreover, the process is convenient and the thermal treatment does not need to be carried out in advance and afterwards. The special cobalt-based metal ceramic alloy powder is particularly suitable for the surface treatment of the die and can greatly prolong the service life of the die.
Description
technical field [0001] The invention relates to alloy materials, in particular to a metal-ceramic alloy powder specially used for high-energy fiber laser cladding. Background technique [0002] The principle of laser cladding is to irradiate the metal material with a high-energy laser beam, so that a laser molten pool is formed on its surface, and new additive materials are filled at the same time. cladding. [0003] Laser cladding technology has been around for nearly 20 years, among which carbon dioxide laser cladding occupies an important position. However, carbon dioxide lasers tend to be gradually replaced by semiconductor lasers and fiber lasers in the process of technological development due to their large size, low flexibility, low beam quality, and uneven energy distribution. [0004] During nearly two decades of laser cladding applications, the market has prepared a wide variety of alloy powders for carbon dioxide laser cladding. However, the beam wavelength of ...
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