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Method for spraying composite coating on plunger of emulsification pump and plunger including same

A composite coating, emulsification pump technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of high porosity, increased motion friction resistance, poor coating quality, etc. The effect of uniform surface, high bonding strength and high density

Active Publication Date: 2020-06-09
CHINA SHENHUA ENERGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are also some defects in the existing ceramic plunger during use: (1) the surface finish of the plunger is not enough, which increases the frictional resistance of motion, thereby reducing the production efficiency; (2) the ceramic body has cracking phenomenon, and this cracking is It is not easy to detect during the manufacturing process of the ceramic body, but due to the internal stress during the operation of the plunger, the cracks continue to expand and cause the workpiece to be scrapped; (3) The impact of the installation and disassembly process is easy to cause damage to the plunger
At present, although the existing plunger made of ceramic surface layer overcomes the shortcomings of metal plunger and ceramic plunger, but because the preparation of ceramic plunger coating mainly relies on flame spraying and plasma spraying technology, the coating quality is poor, and the spraying The bonding strength between the layer and the matrix is ​​low, it cannot bear alternating loads and impact loads, the porosity is high, and finally it needs to be sealed to meet the requirements of use.

Method used

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  • Method for spraying composite coating on plunger of emulsification pump and plunger including same
  • Method for spraying composite coating on plunger of emulsification pump and plunger including same
  • Method for spraying composite coating on plunger of emulsification pump and plunger including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) The friction surface of the aluminum alloy plunger is roughly machined, and the deviation from the required size is -0.2mm. The aluminum alloy plunger substrate is degreased with an organic solvent, and after drying, it is sandblasted with 300 mesh silicon carbide sand. The non-coated areas are protected with clamps. Sand blasting pressure 4kg / cm with silicon carbide sand 2 , the sandblasting distance is 10mm, and the sandblasting angle is 80°.

[0040] (2) Preheat the plunger substrate to 100°C, and spray a layer of Al by supersonic plasma spraying method 2 o 3 and NiCrAl powder as a composite transition layer, Al in the composite transition layer 2 o 3 The weight fraction of the composite transition layer is 10%, and the thickness of the obtained composite transition layer is 0.03mm.

[0041] (3) Preparation of TiO by supersonic plasma spraying 2 The weight percent is 10% Al 2 o 3 -TiO 2 For the ceramic surface layer, the spraying current is 350A, the spr...

Embodiment 2

[0044] (1) The friction surface of the aluminum alloy plunger is roughly machined, and the deviation from the required size is -0.3mm. The aluminum alloy plunger substrate is degreased with an organic solvent, and after drying, it is sandblasted with 300 mesh silicon carbide sand. The non-coating area is protected with a fixture, and the sandblasting pressure of silicon carbide sand is 8kg / cm 2 , the sandblasting distance is 20mm, and the sandblasting angle is 90°.

[0045] (2) Preheat the plunger base to 100°C, and spray a layer of NiCrAl and Al with supersonic plasma spraying method 2 o 3 Powder as composite transition layer, Al 2 o 3 The weight fraction of the composite transition layer is 20%, and the obtained thickness is 0.03mm.

[0046] (3) Preparation of TiO by supersonic plasma spraying 2 The weight percent is 15% TiO 2 -Al 2 o 3 For the ceramic surface layer, the spraying current is 300A, the spraying voltage is 150V, and the thickness of the ceramic surface ...

Embodiment 3-7

[0050] Embodiment 3-7 adopts the same method as Embodiment 2, and different specific spraying conditions and performance parameters are shown in Tables 2 and 3.

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Abstract

The invention discloses a method for spraying a composite coating onto an emulsification pump plunger. The method comprises the following steps that (1) a metal plunger matrix is subjected to oil removal treatment, and sand blasting is carried out after drying; (2) a metal plunger obtained after sand blasting is preheated, and a NiCrAl and Al2O3 containing composite transition layer is sprayed onto the metal plunger through supersonic plasma; (3) after the composite transition layer is sprayed, a Al2O3 and TiO2 composite ceramic face layer is sprayed onto the surface of the composite metal transition layer through supersonic plasma; and (4) the metal plunger with the ceramic face layer sprayed is subjected to rough grinding, accurate grinding and polishing treatment, and the composite coating is obtained. Through the adoption of the method, a supersonic plasma method is utilized, the contents of Al2O3 and TiO2 in the composite coating are controlled, and the obtained coating is high inbonding strength, even in coating surface and high in density and hardness; and compared with a full ceramic plunger, the plunger is not prone to being damaged, the binding force of the coating and the matrix is high, the plunger is repairable, and the application range of the plunger is widened.

Description

technical field [0001] The invention relates to a method for manufacturing a ceramic coating, in particular to a method for preparing a supersonic plasma thermal spray coating on an emulsification pump plunger, and belongs to the field of material surface processing. Background technique [0002] Ceramic plungers are mainly used in plunger machinery in the coal, petroleum, chemical, and food industries to replace metal plungers and solve the problem of short equipment life due to poor corrosion resistance and low working temperature resistance of metal plungers. Ceramic plunger products have extremely high wear resistance, corrosion resistance and thermal shock resistance, and their service life is 5 to 10 times longer than that of metal plungers. [0003] There are also some defects in the existing ceramic plunger during use: (1) the surface finish of the plunger is not enough, which increases the frictional resistance of motion, thereby reducing the production efficiency; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/06C23C4/11
CPCC23C4/06C23C4/11C23C4/134
Inventor 原长锁杨建峰高昌乐王旭东王子敬王波李春芳
Owner CHINA SHENHUA ENERGY CO LTD
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