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Diesel engine valve coating technology

A diesel engine and valve technology, which is applied in the field of diesel engine valve coating technology, can solve the problems of poor high temperature resistance and corrosion resistance of the valve, affecting the service life of the valve, etc., and achieve the effect of reducing porosity, improving overall performance and dense internal organization.

Inactive Publication Date: 2017-11-21
ANHUI WODE VALVE MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the coating process of diesel engine valves needs to be improved. The valves after coating are poor in high temperature resistance and corrosion resistance, which affects the service life of the valves.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A coating process for a diesel engine valve proposed by the invention includes pre-plating pretreatment and plasma cladding treatment.

Embodiment 2

[0020] A kind of diesel engine valve coating process that the present invention proposes, concrete steps are as follows:

[0021] S1. Pretreatment before plating: Soak the part of the diesel engine valve that needs to be coated in the activation solution, clean and dry; wherein the activation solution is sulfuric acid;

[0022] S2. Plasma cladding treatment: uniformly coat the mixed powder on the surface of the pre-treated diesel engine valve that needs to be coated, perform plasma cladding treatment, cool to obtain material A, and then heat treatment.

[0023] Among them, the plasma cladding process parameters are as follows: the ion gas flow rate is 3L / min, the protective gas is argon and the argon flow rate is 6.5L / min, the transfer arc voltage is 38V, the transfer current is 90A, and the spray distance is 2.2cm. The power is 2.2KW, the scanning speed is 6.5mm / s, the diameter of the plasma arc spot is 1.8mm, and the thickness of the plasma cladding layer is 0.5-0.8mm;

[0...

Embodiment 3

[0028] A kind of diesel engine valve coating process that the present invention proposes, concrete steps are as follows:

[0029] S1. Pretreatment before plating: Soak the part of the diesel engine valve that needs to be coated in an activation solution, clean and dry; wherein, the activation solution is composed of sulfuric acid and acetic acid in a volume ratio of 1:1;

[0030] S2. Plasma cladding treatment: evenly coat the mixed powder on the surface of the diesel engine valve that needs to be coated after pre-plating pretreatment, perform plasma cladding treatment, cool down, and obtain material A, and then raise the temperature of material A to 260 ° C for 18 minutes, Keep warm for 1.5h, then raise the temperature to 335°C over 8min, keep warm for 3.4h, and then air cool to room temperature.

[0031] Among them, the specific parameters of the plasma cladding process are as follows: the ion gas flow rate is 2L / min, the shielding gas is argon and the argon flow rate is 5L / m...

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Abstract

The invention discloses a diesel engine valve coating technology. The diesel engine valve coating technology comprises the steps of pretreatment before coating and plasma cladding treatment. The diesel engine valve coating technology specifically comprises the following process that the portion, needing to be coated, of a diesel engine valve is soaked in an activating solution, cleaned and dried; mixed powder is uniformly applied to the surface of the portion, needing to be coated, of the diesel engine valve obtained after pretreatment before coating, plasma cladding treatment is conducted, cooling is conducted, a material A is obtained, and then heat treatment is conducted. According to the diesel engine valve coating technology, a coating material and a substrate are combined closely and distributed uniformly through the optimized technology, therefore, the high temperature resistance, the corrosion resistance and the fatigue resistance of the diesel engine valve are effectively improved, ad the service life of the diesel engine valve is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a coating process for a diesel engine valve. Background technique [0002] From the structure of the engine, the valves can be divided into intake valves and exhaust valves. The function of the intake valve is to suck air into the engine and mix it with fuel for combustion. The function of the exhaust valve is to discharge the burned exhaust gas and dissipate heat. Existing diesel engine valves are mostly made of metal or alloy materials, which need to bear high mechanical load and thermal load when working, and also bear the impact load of seating and the static load given by the gas pressure, resulting in valve wear and corrosion Seriously, it affects the service life of its valve. Coating refers to a thin layer of material that adheres to a certain base material to play a special role and has a certain bonding strength with the base material. It can overcome certain defects ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C38/54C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48
CPCC23C24/103C22C38/002C22C38/005C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/54
Inventor 林青锋
Owner ANHUI WODE VALVE MFG
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