Plasma spray gradient wear-resistant plate and preparation method and application thereof
A plasma and wear-resistant plate technology, which is applied in the direction of fusion spraying, coating, metal material coating process, etc., can solve the problems of unable to meet large-scale and complex working conditions, single performance of wear-resistant plate, and easy damage , to achieve the effects of reducing residual stress, good wettability, increasing density and binding force
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Embodiment 1
[0034] 1. Raw material preparation
[0035] Accurately weigh 15.0% Ti, 20.0% Cr, 7.0% Ni, 5.0% W, 5.0% Al, 10.0% B by mass 4 C, 5.0% SiC, 10.0% TiC, and the rest is Fe, put the above powder into a mixer for ball milling for 8 hours, take it out and use it as a plasma spray reaction powder for later use;
[0036] The transition layer material is commercially available Fe50 iron-based self-fluxing alloy powder.
[0037] 2. Steel plate surface pretreatment
[0038] The substrate adopts Q235 steel plate with length, width and thickness of 1000×500×20mm. The purpose of surface pretreatment is mainly to remove oil, rust and scale, and improve the contact area and bonding strength of the wear-resistant layer. Surface pretreatment is divided into two steps: cleaning and sandblasting: first use acetone or gasoline to completely remove the oil on the surface of the wear plate, and then sandblast the surface of the wear plate to remove rust and scale, making the surface silver gray.
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Embodiment 2
[0047] Example 2 The mass percentage of powder is: 10.0% Ti, 15.0% Cr, 3.0% Ni, 2.0% W, 3.0% Al, 6.0% B 4 C, 2.0% SiC, 5.0% TiC, and the rest is Fe. The preparation method is basically the same as that of Example 1, except that the gradient composite coating preparation process in step 3, the surface wear-resistant layer is prepared by using a dual-channel powder feeder to feed powder synchronously, and one channel is the plasma spraying reaction powder of the present invention. The powder rate is controlled at 20g / min, the other channel is Fe50 iron-based self-fluxing alloy powder, the powder feeding rate is controlled at 15g / min, and the obtained surface wear-resistant layer reaches 58-60HRC.
[0048] The wear-resistant plate of the second embodiment is suitable for the bucket lining of kneading machines in coal yards, hopper lining plates and grab blades of loading machines, etc.
Embodiment 3
[0050] Example 3 The mass percentage of powder is: 12.0% Ti, 18.0% Cr, 5.0% Ni, 3.0% W, 4.0% Al, 8.0% B 4 C, 3.5% SiC, 7.5% TiC, the rest is Fe, the preparation method is basically the same as in Example 1, the difference is the preparation process of the gradient composite coating in step 3, and the preparation of the surface wear-resistant layer adopts a dual-channel powder feeder to feed powder synchronously , one channel is the plasma spraying reaction powder of the present invention, the powder feeding rate is controlled at 25g / min, the other channel is Fe50 iron-based self-fluxing alloy powder, the powder feeding rate is controlled at 12g / min, and the obtained surface wear-resistant layer The hardness reaches 60-62HRC.
[0051] The wear-resistant plate of the third embodiment is suitable for lining plates of iron ore sintering machines, lining plates of scraper machines, and the like.
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