Hole sealing method for plasma spray coating and insulating bearing
A plasma and hole-sealing technology, which is applied in coating, metal material coating process, molten spraying, etc., can solve the problem of high residual porosity, improve penetration depth, improve bonding force and reduce residual porosity Effect
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Embodiment 1
[0028] The plasma sprayed coating in this embodiment is an aluminum oxide insulating coating sprayed on the surface of the bearing by a plasma spraying method, and the thickness of the coating is 100-120 μm. The sealing method of the plasma sprayed coating includes the following steps:
[0029] (1) Clean the surface of the bearing with plasma spray coating on the surface with acetone, and then bake it in an oven at 100°C (heating rate: 5°C / min) for 3 hours;
[0030] (2) Then put the dried bearing into an airtight container, and pour 70°C epoxy resin sealing agent into the container to ensure that the bearing is completely submerged in the sealing agent. Then airtightly evacuate to an absolute vacuum of 50 Pa, and then maintain this vacuum state for 40 minutes; then pass nitrogen into the airtight container to increase the pressure in the container to 0.3 MPa, and keep the pressure for 40 minutes;
[0031] (3) Then release the pressure, take out the bearing, remove the excess s...
Embodiment 2
[0033] The plasma sprayed coating of this embodiment is an aluminum oxide insulating coating sprayed on the bearing surface by a plasma spraying method, and the thickness of the coating is 120-150 μm. The method for sealing holes of the plasma sprayed coating includes the following steps:
[0034] (1) Clean the surface of the bearing with plasma spray coating on the surface with acetone, and then bake it in an oven at 100°C (heating rate: 5°C / min) for 3 hours;
[0035] (2) Then put the dried bearing into an airtight container, and pour 80°C epoxy resin sealing agent into the container to ensure that the bearing is completely submerged in the sealing agent. Then airtightly evacuate to an absolute vacuum of 50 Pa, and then maintain this vacuum state for 70 minutes; then pass nitrogen into the airtight container to increase the pressure in the container to 0.2 MPa, and keep the pressure for 70 minutes;
[0036] (3) Then release the pressure, take out the part, remove the excess s...
Embodiment 3
[0040] The insulating bearing of the present embodiment is made by the method comprising the following steps, and its preparation process route is as follows: figure 1 As shown, specifically:
[0041] (1) Preparation of insulating coating
[0042]Choose alumina powder with a particle size of 30-40 μm and a purity of ≥99.5%, bake it in an oven at 100°C for 1 hour, and then use a plasma spraying process to spray aluminum oxide insulating coating on the outer diameter of the bearing outer ring, the end face, the inner diameter of the inner ring, and the end face. layer to obtain a bearing with an insulating coating on the surface. The process parameters of plasma spraying are: voltage 70V, current 500A, powder feeding speed 35g / min, spraying distance 180mm, insulating coating thickness 100-120μm.
[0043] (2) Then adopt the sealing method of the same embodiment 1 to seal the insulating coating.
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Abstract
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