Method for carrying out high velocity oxy-fuel spraying on surface of roller of lithium battery pole piece rolling machine

A technology of supersonic flame and roll surface, which is applied in the direction of coating, fusion spraying, metal material coating process, etc., and can solve the problems of unreachable working conditions of the workpiece, peeling of coating and substrate, and peeling of coating and coating, etc. problems, to reduce downtime and roll replacement and regrinding time and cost, to prevent electrochemical corrosion, good bonding effect

Inactive Publication Date: 2016-03-30
GUANGDONG INST OF NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bonding force between the two coatings and the substrate is about 70MPa, and the porosity of the coating is about 0.6-1%. The compressive stress will generate a shear force parallel to the joint between the coating and the substrate. Under the action of the shear force, the coating is prone to shear fatigue, resulting in peeling of the coating and failure of the roll, which cannot meet the harsh requirements of the working conditions of the workpiece.
Therefore, the existing ordinary supersonic flame sprayed tungsten carbide coating on the roll of the lithium battery pole piece roll machine will cause the coating to fall off after about one week of use. shedding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The roll diameter of the lithium battery pole piece roll machine in the embodiment of HVAF supersonic flame spraying according to the present invention is 500m and the length is 1000mm. It is made of forged alloy steel. The hardness of the roll surface is about HRC63. 10,000 meters need to be re-grinded, and the roller matrix is ​​scrapped after grinding about six times.

[0027] The roll diameter of the lithium battery pole piece roll machine is 500mm. After conventional degreasing and sandblasting, the nickel-based tungsten carbide (10% nickel 90% tungsten carbide) is sprayed with supersonic flame spraying equipment (HVAF). The linear speed of the roll is 100m / min, the rotational speed of the workpiece is 64 rpm, the lateral movement speed of the spray gun is 640mm / min, and the spraying parameters are: air 0.6MPa, propane 0.47MPa, H 2 The flow rate is 30L / min, and the outlet diameter of the combustion chamber is 20mm. During the spraying process, the air cooling meth...

Embodiment 2

[0029] The lithium battery pole piece roll machine roll in a HVAF supersonic flame spraying embodiment according to the present invention has a diameter of 460m and a length of 800mm. It is made of forged alloy steel. The hardness of the roll surface is about HRC62. Generally, it can be used continuously for 30 days or more. 450,000 meters need to be re-grinded, and the roller matrix is ​​scrapped after grinding about six times.

[0030] The roll diameter of the lithium battery pole piece roll machine is 460mm. After conventional degreasing and sandblasting, the cobalt-based tungsten carbide (12% cobalt 88% tungsten carbide) is sprayed with supersonic flame spraying equipment (HVAF). The linear speed of the roll is 100m / min, the rotational speed of the workpiece is 70 rpm, the lateral movement speed of the spray gun is 720mm / min, and the spraying parameters are: air 0.6MPa, propane 0.47MPa, H 2 The flow rate is 30L / min, and the outlet diameter of the combustion chamber is 20mm...

Embodiment 3

[0032] In the example of HVOF supersonic flame spraying according to the present invention, the roll diameter of the lithium battery pole piece roll machine is 400m, the length is 720mm, and it is made of forged alloy steel. Repair and grind about 7 times and the roller matrix is ​​scrapped.

[0033] The roll diameter of the lithium battery pole piece roll machine is 400mm. After conventional degreasing and sandblasting, the supersonic flame spraying equipment (HVOF) is used to spray cobalt-chromium-based tungsten carbide (10% cobalt 4% chromium 86% tungsten carbide). The linear speed of the roll is 100m / min, the rotational speed of the workpiece is 80 rpm, the lateral movement speed of the spray gun is 800mm / min, and the spraying parameters are: oxygen 900L / min, kerosene 26L / min, H 2 The flow rate is 30L / min, and the outlet aperture of the combustion chamber is Φ5mm. During the spraying process, the temperature of the roll is controlled below 150°C, and the tungsten carbide ...

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Abstract

The invention relates to a method for carrying out high velocity oxy-fuel spraying on the surface of a roller of a lithium battery pole piece rolling machine. The method of adding hydrogen into fuel and decreasing the diameter of a combustion chamber is adopted. By means of adding the hydrogen, the heat enthalpy value and the speed of the flame are increased. By means of adding of the hydrogen, tungsten carbide particles can be reduced and protected, and burning losses and decarburization are avoided. To further increase the speed of the flame, the diameter of an outlet of the combustion chamber is decreased by 2 mm-5 mm, the pressure of the combustion chamber is increased, and the speed of the flame is further increased. Due to adding of the hydrogen, burning losses and decarburization of the tungsten carbide particles can be reduced, the heat enthalpy value of the flame is increased, the tungsten carbide particles are heated more evenly, a coating can have higher tenacity and compactness, and the binding force of the coating is improved. By means of the method, the speed of the flame is increased, and the aim of increasing the particle spraying speed is achieved; and tungsten carbide particles at a higher speed impact on a base body, the binding force of the coating and the base body is improved, the inner binding force of the coating is increased by means of subsequent higher-speed particle impact, and therefore the binding force of the whole coating is increased.

Description

technical field [0001] The invention relates to a supersonic flame spraying method, in particular to a method for supersonic flame spraying on the surface of a roll of a lithium battery pole piece roll machine. Background technique [0002] With the development of new energy technologies, the demand for lithium batteries is increasing day by day. Lithium-ion batteries are composed of lithium-ion cells, electrolyte, protection circuit (PCM) and casing. The battery cell is composed of positive electrode, negative electrode and separator. The components of the positive electrode are positive electrode materials (such as lithium iron phosphate) + conductive agent + binder (PVDF) + current collector (aluminum foil), and the components of the negative electrode are graphite + conductive agent + thickener (CMC) + binder (SBR) + current collector (copper foil). The positive and negative electrodes are generally called battery pole pieces in the industry. In order to improve the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10C23C4/129C23C4/02
CPCC23C4/10C23C4/02
Inventor 张忠诚李风浪朱晖朝李云梅刘自敬陈虎王枫皮志明
Owner GUANGDONG INST OF NEW MATERIALS
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