Method for preparing NiCrBSi-TiN gradient composite coating abrasion-resistant belt on the surface of drill rod joint
A drill pipe joint and composite coating technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of no large-scale mass production and application, casing wear and high price, etc. The effect of eliminating macroscopic interfaces, reducing manufacturing costs, and improving bond strength
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Embodiment 1
[0036] The method for preparing the NiCrBSi-TiN composite coating wear-resistant band on the surface of the oil drill pipe joint comprises the following processes:
[0037] (1) Surface pretreatment of base material
[0038] Clean and degrease the drill pipe joints with absolute ethanol at room temperature, and then perform sandblasting to finally obtain a surface with a roughness of 50-75 μm;
[0039] (2) Preparation of Gradient Coating
[0040] Nickel-based alloy powder NiCrBSi is used as the main material for preparing the wear-resistant coating. Prepare the mixed powder of each layer according to the ratio of NiCrBSi and Ti powder in each layer of the composite gradient coating below, and put the mixed powder of each layer into the grinding machine Mixed in medium for 60min, the powder should be dried at 105℃ for 1 hour before spraying; during the spraying process, through in-situ chemical reaction 2Ti+N 2 =2TiN prepares NiCrBSi-TiN composite gradient coating; the rotatio...
Embodiment 2
[0055] The method for preparing the NiCrBSi-TiN composite coating wear-resistant band on the surface of the oil drill pipe joint comprises the following processes:
[0056] (1) Surface pretreatment of base material
[0057] The base material is degreased with absolute ethanol at room temperature, and then sandblasted to obtain the roughness R a ≈5.0μm surface;
[0058] (2) Preparation of Gradient Coating
[0059] The rotation speed of the sample during spraying is about 15r / min, and the sample is preheated with a spray gun for 3 minutes to reduce the internal stress generated during the spraying process. The preheating temperature is 120°C.
[0060] Spray the first layer of pure NiCrBSi layer with a thickness of 90 μm;
[0061] The second layer is 95%NiCrBSi+5%Ti, with a thickness of 90μm;
[0062] The thickness of the third layer 90%NiCrBSi+10%Ti is 70μm;
[0063] The fourth layer is 85%NiCrBSi+15%Ti, with a thickness of 75μm;
[0064] The fifth layer is 80%NiCrBSi+20%T...
Embodiment 3
[0073] The method for preparing the NiCrBSi-TiN composite coating wear-resistant band on the surface of the oil drill pipe joint comprises the following processes:
[0074] (1) Surface pretreatment of base material
[0075] The base material is degreased with absolute ethanol at room temperature, and then sandblasted to obtain the roughness R a ≈5.0μm surface;
[0076] (2) Preparation of Gradient Coating
[0077] The rotation speed of the sample during spraying is about 15r / min, and the sample is preheated with a spray gun for 3 minutes to reduce the internal stress generated during the spraying process. The preheating temperature is 120°C.
[0078] Spray the first layer of pure NiCrBSi layer with a thickness of 80 μm;
[0079] The second layer is 95%NiCrBSi+5%Ti, with a thickness of 100μm;
[0080] The thickness of the third layer 90%NiCrBSi+10%Ti is 80μm;
[0081] The fourth layer is 85%NiCrBSi+15%Ti, with a thickness of 70μm;
[0082] The fifth layer is 80%NiCrBSi+20%...
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