A kind of composite thermal spraying powder and its preparation method
A technology of thermal spraying powder and composite coating, applied in coating, fusion spraying, metal material coating process, etc., can solve the problem of poor combination of ceramic phase and metal phase, uneven composition of composite powder, scattering or degradation of ceramic phase and other problems, to achieve the effect of high sphericity, excellent coating adhesion and good wear resistance
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[0032] The embodiment of the present invention also provides a kind of preparation method of composite thermal spraying powder, such as figure 1 Shown is a schematic flow diagram of the preparation method provided by the embodiment of the present invention, the preparation method comprising:
[0033] Step 11: first extract the raw materials according to the set mass ratio;
[0034] In this step, the extracted raw materials include: 2-7wt.% aluminum Al, 40-75wt.% chromium Cr, 0.1-0.3wt.% boron B, 3-8wt.% carbon C, and The amount is nickel Ni;
[0035] The boron in the raw material is nickel-boron alloy, chromium-boron alloy or a mixture of the two; and the content of boron in the alloy is 18-21wt.%.
[0036] Step 12: Put the extracted raw materials into a vacuum melting crucible, and use vacuum induction melting-inert gas atomization to obtain Ni 3 Al-based alloy powder;
[0037] In this step, the content of the obtained in-situ authigenic chromium carbide is 35-85vol.%; an...
example 1
[0048] Example 1, at first get raw material by following mass ratio, aluminum Al: 5.2wt.%, chromium Cr: 55.3wt.%, boron B: 0.21wt.%, carbon C: 5.0wt.%, nickel Ni: surplus; And A nickel plate, a nickel-boron alloy block, a chromium block, and a graphite block are sequentially put into the vacuum melting crucible.
[0049] Then use an intermediate frequency induction furnace to heat and refine the raw materials. The vacuum degree in the furnace is 9.6Pa, and the heating rate is 15°C / min. Insulation treatment, the holding time is 45min, the frequency of the electromagnetic stirrer is 4000Hz, during which aluminum blocks are added step by step for smelting;
[0050] The obtained alloy liquid enters the atomization tank through the tundish and the leak nozzle for high-pressure argon atomization. The diameter of the leak nozzle is 4 mm, the atomization cone angle is 60°, and the atomization pressure is 3.5 MPa. The atomized powder is subjected to airflow classification treatment to...
example 2
[0054] Example 2, at first get raw material by following mass ratio, aluminum Al: 3.8wt.%, chromium Cr: 66.8wt.%, boron B: 0.23wt.%, carbon C: 6.0wt.%, nickel Ni: surplus; A nickel plate, a nickel-boron alloy block, a chromium block, and a graphite block are sequentially put into the vacuum melting crucible.
[0055] Then use an intermediate frequency induction furnace to heat and refine the raw materials. The vacuum degree in the furnace is 9.7Pa, and the heating rate is 15°C / min. For 20 minutes, the frequency of the electromagnetic stirrer is 5000Hz, during which aluminum blocks are added step by step for smelting;
[0056] The obtained alloy liquid enters the atomization tank through the tundish and the leak nozzle for high-pressure argon atomization. The diameter of the leak nozzle is 5 mm, the atomization cone angle is 65°, and the atomization pressure is 4.0 MPa. Vibrating sieving and classifying the atomized powder to obtain chromium carbide in situ self-generated rein...
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