Oscillating Feeder Powder Dosing with Decoupling for Plasma Coating
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Solution Overview
Problem
Conventional powder feeding systems for plasma coating and spraying lack precision in dosing powder particles, leading to inconsistent layer formation and electrical properties in plasma-induced layer generation on device surfaces.
Innovation Solution
An apparatus with an oscillating feeder and decoupling mechanism that adjusts the feeding rate based on real-time powder quantity measurements, ensuring a predetermined ratio of powder extraction from the powder-gas mixture, thereby achieving precise powder dosing and uniform layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional powder feeders are used for plasma coating and spraying, then the basic function of supplying powder is achieved, but the dosing precision is insufficient leading to inconsistent layer formation
Solution Approach 1:
The powder-gas mixture flow is divided into two separate paths: one path supplies powder to the plasma processing means, while the other path extracts a defined proportion for measurement. This segmentation allows the measurement function to be separated from the main powder supply function, enabling precise dosing without significantly complicating the overall system.
Solution Approach 2:
A decoupling means is introduced as an intermediary component that extracts a defined proportion of powder from the powder-gas mixture. This intermediary enables indirect measurement of the main powder flow by measuring the extracted portion, thereby achieving precise dosing control through a mediating measurement path.
2Manufacturing precision
If powder quantity is not precisely controlled, then the feeding system remains simple, but the layer formation consistency and electrical properties become inconsistent
Solution Approach 1:
The system continuously measures the powder quantity in the extracted portion and uses this information to adjust the feeding rate of the oscillating feeder. This feedback loop ensures consistent layer formation by dynamically compensating for variations in powder flow, achieving high manufacturing precision through closed-loop control.
Solution Approach 2:
The decoupling means extracts a defined proportion of powder before the main powder reaches the plasma processing means. This preliminary extraction allows the system to measure and control the powder quantity in advance, ensuring consistent dosing before the actual plasma coating or spraying process begins.
3Measurement precision
If real-time powder quantity measurement is implemented, then dosing accuracy improves, but the system complexity and measurement requirements increase
Solution Approach 1:
A defined proportion of powder is extracted from the main powder-gas mixture through the decoupling means. This extraction creates a separate, manageable sample stream that can be measured with simpler instrumentation, reducing the complexity of the overall measurement system while maintaining measurement precision for the main powder flow.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables extremely uniform and precise plasma-induced layer generation on device surfaces, allowing for accurate adjustment of electrical properties and integration of high-conductivity contact terminal areas with the electrical heating resistor element.
Implementation Method 1
a plasma source (208) for introducing plasma (210) into a process area (206) to activate the provided powder particles (112) in the process area (206) with the plasma (210)
Implementation Method 2
activating the provided powder particles in the process area of a plasma spraying arrangement with the plasma of a plasma source
Data Source
AI summary
An apparatus for feeding and dosing powder includes a powder storage container, an oscillating feeder with feeder with adjustable feeding rate for dispensing the powder to a powder outlet, a conduit arrangement for feeding the powder dispensed from the oscillating feeder in a feeding gas as a powder-gas mixture and for supplying the powder-gas mixture to a powder processor, wherein a decoupler is provided in the conduit arrangement to extract a defined proportion of the powder from the powder-gas mixture, a powder quantity measuring arrangement for detecting the decoupled powder quantity and for providing a powder quantity information signal, wherein the extracted powder quantity has a predetermined ratio to the fed powder quantity of the oscillating feeder, and controller configured to adjust the adjustable feeding rate of the oscillating feeder to a predetermined set value based on the powder quantity information signal provided.