Ceramic reinforced graphite self-lubricating coating on titanium alloy surface and preparation method thereof
A self-lubricating coating, titanium alloy technology, applied in the direction of metal material coating process, coating, etc., can solve the problems of high friction coefficient, low hardness of titanium alloy, self-lubricating performance of segregation coating, etc.
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Embodiment 1
[0042] In this embodiment, a TruDisk4002 fiber laser is used to prepare a ceramic-enhanced graphite self-lubricating coating on the surface of a Ti-6Al-4V titanium alloy with a size of 60mm×40mm×10mm. The preparation method includes the following steps:
[0043] S1. Pretreatment of the surface of the titanium alloy substrate to be clad: sandblast the surface of the TC4 alloy to be clad to remove the oxide film and oil stains on the surface of the titanium alloy, and place the sandblasted substrate in anhydrous ethanol for ultrasonic cleaning for 15 minutes , after cleaning, put it in a vacuum drying box for use;
[0044] S2. Preparation and pretreatment of cladding materials: The cladding materials are prepared in proportion and placed in a planetary ball mill for ball milling for 12 hours, and the ball-milled cladding powder is placed in a vacuum drying box with a temperature of 80°C for constant temperature drying for 10 hours;
[0045] In this embodiment, the cladding mater...
Embodiment 2
[0050] In this example, a TruDisk4002 fiber laser is used to prepare a ceramic-enhanced graphite self-lubricating coating on the surface of a Ti-6Al-4V titanium alloy with a size of 60mm×40mm×10mm. The differences from Example 1 are:
[0051] The cladding material adopts 30wt% TC4 powder with a particle size of 45-105 μm, 35wt% Ni60 powder with a particle size of 40-100 μm and 35wt% nickel-coated graphite powder with a particle size of 30-100 μm, and the graphite content in the nickel-coated graphite powder is 25wt %.
[0052] figure 2 (b) The macroscopic morphology photo of the coating cross-section of this example, it can be seen that the coating structure is uniform and dense, and the forming quality is good. increased. The average microhardness of the coating is 695HV 0.5 , which is lower than that of Example 1, but its friction coefficient (0.09) is significantly lower than that of Example 1 (0.41) (see Figure 5 ). Graphite is a soft lamellar structure, and it is e...
Embodiment 3
[0054] In this example, a TruDisk4002 fiber laser is used to prepare a ceramic-enhanced graphite self-lubricating coating on the surface of a Ti-6Al-4V titanium alloy with a size of 60mm×40mm×10mm. The differences from Example 1 are:
[0055] The cladding material adopts 30wt% TC4 powder with a particle size of 45-105μm, 25wt% Ni60 powder with a particle size of 40-100μm and 45wt% nickel-coated graphite powder with a particle size of 30-100μm, and the graphite content in the nickel-coated graphite powder is 25wt %.
[0056] figure 2 (c) The photo of the macroscopic morphology of the cross-section of the coating of this example, it can be seen that the coating structure is uniform and dense, and the forming quality is good. 1 increased significantly. The average microhardness of the coating is 681HV 0.5 , the friction coefficient with WC on the grinding ball is 0.1 (see Figure 5 ), the coating has good friction and wear properties.
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