An adjustable dual-channel powder feeding device
A powder feeding device, dual-channel technology, applied in spraying device, liquid spraying device, metal material coating process, etc., can solve the problems of inability to obtain coating quality, inability to obtain the melting state at the same time, and achieve flexible and diverse adjustment and manufacturing. Low cost and strong practicability
Active Publication Date: 2015-12-23
GUANGDONG INST OF NEW MATERIALS
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Problems solved by technology
This fixed powder feeding device has inherent shortcomings: two different powders are fed in this way, and there are differences in the melting state in the jet flow, and the best melting state cannot be obtained at the same time
It can be seen that when it is necessary to spray two kinds of powders with different particle sizes or different types of powders at the same time, it is impossible to adjust the impact of the two powders by optimizing the process parameters by using the traditional dual-channel powder feeding device fixed around the nozzle outlet. The best melting state is achieved before the substrate, so the best coating quality and some coating structure systems with special requirements, such as particle-reinforced coatings, cannot be obtained
Method used
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Embodiment 1
[0024] The invention is installed on the MC-60 low-pressure plasma spray gun, and the titanium powder and the WC-12Co powder are simultaneously fed in two channels to prepare a composite coating.
[0025] Among them, high-purity titanium powder has a purity of 99.9% and a particle size of 25-45 μm; WC-12Co powder has a particle size of 25-65 μm. The titanium powder is conveyed through the fixed powder feeding nozzle 7, and the WC-12Co powder is conveyed through the sliding powder feeding nozzle 8. When preparing a composite coating, the position of the slider 3 is first adjusted by the screw nut adjustment mechanism, and the slider 3 drives the sliding powder feeding nozzle 8 to move in the axial direction of the spraying jet 10, and the displacement is determined by the scale value on the inner groove bracket 2 For quantitative indication, the distance between the sliding powder feeding nozzle 8 and the fixed powder feeding nozzle 7 is 20-40mm.
[0026] The main parameters o...
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An adjustable two-channel powder feeding device comprises a spray gun connecting piece, an inner-groove type support connected with the spray gun connecting piece, a support end face fixing sheet connected with the inner-groove type support, a sliding block installed in a groove cavity of the inner-groove type support, a screw-and-nut adjusting mechanism connected with the sliding block, a fixed powder feeding nozzle installed on the spray gun connecting piece and a sliding powder feeding nozzle installed on the sliding block. The sliding direction of the sliding block is consistent with the central axis direction of a spray jet flow. The adjustable two-channel powder feeding device can realize synchronous two-channel powder feeding, and two kinds of powder with different grain diameters or different materials can be simultaneously fed into the spray jet flow through two channels; because powder feeding can be adjusted at the axial position of the spray jet flow by adjusting the sliding powder feeding nozzle, the two kinds of powder can reach the optimum molten state before impacting a base body, and coating quality can be improved; in addition, the molten state of one kind of powder before the power impacts the base body can be changed by adjusting the sliding powder feeding nozzle so as to realize some coating structural systems with special requirements.
Description
technical field [0001] The invention relates to a powder feeding device for a thermal spraying process in the technical field of modern material surface engineering, in particular to a dual-channel powder feeding device adjustable in the axial direction of a spraying jet. Background technique [0002] Thermal spraying technology first appeared in Switzerland in the early 20th century, and a large number of achievements have emerged in the following one hundred years, including the development of various thermal spraying equipment, the development of new thermal spraying materials and the application of new technologies. Thermal spraying technology is a process in which the coating material (powder or wire) is fed into a certain heat source (arc, combustion flame, plasma, etc.) . Thermal spray coating has excellent properties such as wear resistance, corrosion resistance, high temperature resistance and heat insulation, and can repair the size reduction of parts caused by we...
Claims
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IPC IPC(8): B05B7/26
CPCB05B7/1486C23C4/134
Inventor 毛杰邓畅光邓春明邝子奇刘敏
Owner GUANGDONG INST OF NEW MATERIALS