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Controlled thermal coating

A technology of thermal coating and variable control, which is applied in coating, metal material coating process, fusion spraying, etc.

Inactive Publication Date: 2015-09-23
SIEMENS AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However this is not optimal as the power drop induced by the pressure drop at the burner is only compensated by increasing the powder mass flow

Method used

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Embodiment Construction

[0016] The coating is made by thermal coating process, such as SPPS (solution precursor plasma spraying), HVOF (high velocity flame spraying), APS (atmospheric plasma spraying), LPPS (low pressure plasma spraying), VPS (vacuum plasma spraying), ... apply. In this case, a plasma or a flame is generated in a nozzle, wherein material flows in through the nozzle or at the end of the nozzle.

[0017] Due to wear at the nozzle or at the coating device, the material flow behavior and thus the degree of melting of the material, in particular the powder, changes.

[0018] figure 1 Shown according to the prior art, between the nozzle 30 and the electrode 36 ( Figure 10 ) between the voltage U B Variations of the example. The voltage U between the nozzle 30 and the electrode B decreases with time t and then enters saturation. In other nozzle types, the voltage U B A continuous decrease or other variation in time t is also possible.

[0019] Corresponding to this is the average ...

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Abstract

The process comprises heating, fusing and / or melting a material of stream using a plasma or a flame, measuring, determining and controlling velocity of the material stream, flow rate of gas, brightness distribution or temperature distribution of the material stream and voltage between an electrode and a nozzle and / or a power of the nozzle, changing the current between the nozzle and the electrode and flow rate of the stream as controlled variables, and increasing or decreasing the current. The process comprises heating, fusing and / or melting a material of stream using a plasma or a flame, measuring, determining and controlling velocity of the material stream, flow rate of gas, brightness distribution or temperature distribution of the material flow and voltage between an electrode and a nozzle and / or a power of the nozzle, changing the current between the nozzle and the electrode and flow rate of the stream as controlled variables, and increasing or decreasing the current. The brightness distribution, temperature distribution of the material flow, voltage between the electrode and nozzle and / or the power of the nozzle is maintained as constant. The flow rate of primary and secondary gases is increased or decreased. The method further comprises maintaining controlled variables at desired target values, adjusting parameter sets for different situations including higher, lower or constant the control variables, and determining changes of the target values before coating the material. The coating is carried out by a high velocity oxygen fuel spraying method and a plasma spraying method.

Description

technical field [0001] The invention relates to a technology of thermal cladding. Background technique [0002] Thermal spraying processes are used to produce metallic and ceramic layers, in which the material is completely or at least partially melted. [0003] The material is injected eg into a nozzle of a plasma burner or externally. At least the nozzles are worn out by the extremely high plasma temperature and the influence of the powder material. This causes wear-related fluctuations in the cladding process, which fluctuations are mainly caused by the pressure drop at the burner. [0004] Until now, these fluctuations have been compensated by recontrolling the powder mass flow in order to keep the desired layer weight of the blade within the tolerance zone. [0005] However, this is not optimal, since the increased powder mass flow only compensates for the power drop caused by the pressure drop at the burner. Contents of the invention [0006] It is therefore an o...

Claims

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Application Information

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IPC IPC(8): C23C4/12
CPCC23C4/124C23C4/127C23C4/129C23C4/134
Inventor 罗尔夫·维尔肯赫纳卡斯滕·巴罗茨基马里奥·费尔克尔萨沙·马丁·基耶克约翰内斯·里希特
Owner SIEMENS AG