Preparation method of plasma-sprayed ceramic coating for strengthening surface of water pump impeller

A surface plasma and water pump impeller technology, applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of flow rate, head and efficiency reduction, unstable operation, affecting pump performance, etc., and reach the heat affected zone Small size, high production efficiency, and small heat effect

Inactive Publication Date: 2017-10-27
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wear damage will also affect the performance of the pump, reduce the flow rate, lift and efficiency of the pump, and cause vibration and unstable operation of the unit

Method used

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  • Preparation method of plasma-sprayed ceramic coating for strengthening surface of water pump impeller
  • Preparation method of plasma-sprayed ceramic coating for strengthening surface of water pump impeller
  • Preparation method of plasma-sprayed ceramic coating for strengthening surface of water pump impeller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. Use acetone to ultrasonically clean the surface of the impeller of the water pump to remove impurities such as oil, rust, etc., and dry it immediately after cleaning to prevent rust.

[0047] 2. Use brown corundum with a particle size of 20 mesh to roughen the surface of the water pump impeller to be sprayed to improve the bonding strength between the coating and the substrate. The surface roughness after roughening is required to be greater than Ra 7.0.

[0048] 3. Weigh 2000g of ZrO with a particle size range of 150-300 mesh 2 Ceramic powder, placed in an oven at 100°C to dry for 2 hours to maintain good fluidity of the powder during the spraying process.

[0049] 4. Before spraying, use the plasma flame to go on the surface of the impeller substrate of the water pump, so that the substrate preheating temperature reaches about 150°C, and then use the plasma spraying process to spray ZrO on the surface of the preheated substrate 2 coating. Plasma generation gases ...

Embodiment 2

[0055] The difference between this embodiment and embodiment 1 is that in step 3, 2000g of Al with a particle size range of 250-600 meshes is weighed 2 o 3 Ceramic powder; in step 4, control the powder delivery rate to be 40g / min and send it into the flame flow center, and the flow rate of the plasma generating gas Ar is 45L / min, and the H 2 The flow rate is 6L / min, the spraying power is 40kW, the spraying distance is 100mm, the translation speed of the spray gun is 300mm / s, and the spraying is repeated 5 times. Prepared on the surface of the water pump impeller with a thickness of about 240μm and a hardness of about 830HV 0.3 wear-resistant Al 2 o 3 ceramic coating. The deposition efficiency of the coating is around 50%, and the porosity is around 3%.

Embodiment 3

[0057] The difference between this embodiment and embodiment 1 is that in step 3, 2000g of TiO with a particle size range of 150-300 is weighed 2 Ceramic powder; in step 4, control the powder delivery rate to be 35g / min and send it into the flame flow center, and the flow rate of plasma generating gas Ar is 40L / min, and the H 2 The flow rate is 6L / min, the spraying power is 35kW, the spraying distance is 80mm, the translation speed of the spray gun is 300mm / s, and the spraying is repeated 5 times. Prepared on the surface of the water pump impeller with a thickness of about 250 μm and a hardness of about 750HV 0.3 Abrasion-resistant TiO 2 ceramic coating. The coating phase is mainly rutile TiO 2 , The bonding strength between the coating and the substrate can reach 31MPa.

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Abstract

The invention relates to a preparation method of a plasma-sprayed ceramic coating for strengthening surface of a water pump impeller. The preparation method comprises the following steps: ultrasonically washing the surface of the water pump impeller with acetone, and drying; processing the surface of the water pump impeller through sand-blasting roughening by brown aluminum oxide; preheating the surface of a base body; and spraying ceramic powder onto the surface of the base body of the water pump impeller to obtain a durable and corrosion-resistant ceramic coating, wherein the ceramic coating on the surface of the impeller is obtained by being spraying for a plurality of times. The preparation method overcomes shortages of laser surface modification, thermal spraying, chemical plating and electroplating. The preparation method has the advantages that the use cycle of a water pump is obviously prolonged; requirements of the water pump impeller surface on corrosion resistance and cavitation resistance are met; workpieces are recycled repeatedly; processes are simple and feasible; the production efficiency is high; the automation degree is high; the sustainable development strategy is met; and the method has market economic benefits.

Description

technical field [0001] The invention relates to the technical field of surface coating technology in engineering and material science, in particular to a method for preparing a plasma-sprayed ceramic coating on the surface of an intensified water pump impeller. Background technique [0002] For a long time, the cavitation, wear and joint damage of the pump flow parts have been a big problem in the process of pump operation, repair and maintenance. Especially for water pumps operating in sediment-laden water systems, under the combined action of sediment wear and cavitation, the damage speed of the pump impeller is far faster than that of single erosion wear and cavitation damage. The cavitation wear damage shortens the maintenance period of the water pump, causing a lot of waste of manpower, material resources and financial resources. Therefore, how to effectively improve the anti-abrasion damage performance of the water pump flow parts (impeller), prolong the overhaul peri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/10
CPCC23C4/06
Inventor 张超刘黎明吴庆丹肖金坤
Owner YANGZHOU UNIV
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