CN1445023A - Cathode structure applicable to plasma painting gun - Google Patents
Cathode structure applicable to plasma painting gun Download PDFInfo
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- CN1445023A CN1445023A CN 03114695 CN03114695A CN1445023A CN 1445023 A CN1445023 A CN 1445023A CN 03114695 CN03114695 CN 03114695 CN 03114695 A CN03114695 A CN 03114695A CN 1445023 A CN1445023 A CN 1445023A
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- inside tube
- tungsten
- spray gun
- alloy
- negative electrode
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Abstract
A cathode structure for plasma spraying gun is composed of hollow supporter, internal tube for delivering the coating powder, and external W tube as discharging unit. Said two tube are concentrically welded to said hollow supporter. Its advantages are stable arc combustion, no adhesion between powder, and long service life.
Description
One, affiliated technical field
The invention belongs to materials processing, mechanical manufacturing field.Relate to a kind of plasma spray gun parts, particularly a kind of cathode construction that is used for plasma spray gun.
Two, background technology
The tradition plasma spray gun all is to adopt the entity tungsten electrode, electric arc burns between tungsten electrode end and anode nozzle, under powder feeding mode outside rifle (be called for short outer powder feeding mode) or the gun internal powder conveying mode (abbreviation internal powder conveying mode) sent into by anode nozzle, because powder particle is to enter in the jet perpendicular to plasma jet or to be certain included angle with plasma jet, therefore the degree of divergence of particle movement locus is bigger, cause particle to hit on the matrix, limited the further raising of coating performance with different states.The high-power plasma gun of central shaft to automatic powder feeding system appearred the nineties, its multiple electrode structures that adopt more, and for example the central shaft of many negative electrodes is to the spray gun of automatic powder feeding system, but the spray gun structure complexity, power is bigger.
The simplest structure of axial powder feed is directly in cathode center processing powder feeding duct, but there is following problems in this structure: because negative electrode is in the condition of high temperature in the spraying process, powder particle stops up the powder feeding duct easily melting near the position of cathode end, especially for low-melting metal dust, therefore be difficult to realize continuous spraying, in addition, the powder feeding air-flow in powder feeding duct, center directly enters electric arc, electric arc is produced disturbance, make arc voltage fluctuation, less stable, it is inhomogeneous to cause the particle heating to be quickened, and is difficult to satisfy the requirement of spraying.
Three, summary of the invention
At defective or the deficiency that above-mentioned prior art exists, the purpose of this invention is to provide a kind of hollow cathode structure of simple in structure, the plasma spray gun that is easy to realize.
The solution that realizes above-mentioned purpose is, a kind of cathode construction that is used for plasma spray gun, at least the hollow supporting body, inside tube and the outside tungsten pipe that comprise a paint spray gun negative electrode, be characterized in, the inside tube and the outside tungsten pipe of a band through hole also are set at an end of negative electrode hollow supporting body, inside tube is arranged on the through hole with the negative electrode hollow supporting body, and outside tungsten pipe is arranged on the outer surface of an end of negative electrode hollow supporting body, has certain clearance between inside tube and the outside tungsten pipe.
Some other characteristics of the present invention are:
Described supporter is heat conduction and electric conductivity good copper or Cu alloy material, and the material of described outside tungsten pipe is tungsten or the tungsten alloy that discharge performance is good and fusing point is high, tungsten alloy such as cerium tungsten alloy, thorium tungsten alloy.
Described inside tube material is metal or alloy or pottery or cermet, metal wherein can comprise tungsten, molybdenum, iron, copper, nickel, titanium, vanadium, chromium, cobalt, yttrium, manganese, zirconium, niobium, molybdenum, silver, tantalum, alloy can comprise the alloy of above-mentioned one or more elements, pottery can comprise oxide, nitride, carbide, boride, silicide ceramics, and cermet can comprise the complex that above-mentioned metal or alloy and pottery are formed.
Described inside tube material is mutually concentric with support bar, and inside tube and negative electrode hollow supporting body can unite two into one, as a whole structure.
The end face of described outside tungsten pipe is than the end face height of inside tube, and when the neck-in of inside tube end face guaranteed electrode work, arc stability ground burnt at outside tungsten pipe end face.
The diameter of bore of described inside tube can be 1～3mm, and wall thickness can be 1～2mm; The internal diameter of outside tungsten pipe can be 3～6mm, and wall thickness can be 3～5mm.
Can add some devices or shape on the described supporter in order to fix or to connect other parts,,, also for example device of powder feeding joint can be installed on the supporter in order to fixed-site, adjusting, the connection dust feeder of negative electrode such as machining screw, punching.
This cathode construction is made of hollow supporter and two concentric tungsten pipes, and two different pipes of diameter are welded on an end of supporter, have certain clearance between two pipes.The effective discharge portion of making negative electrode of outside tungsten, inside tube is used for the powders into nozzle, in order to constitute the negative electrode of center axial powder feed plasma spray gun.
Because the present invention adopts two structures such as concentric tube, has following advantage:
1) owing to adopt two-tube nested structure, there are diameter difference and difference in height between the inner and outer pipes, guaranteed only tungsten electrode cigarette burning outside of electric arc,
2) powder feeding air-flow and powder do not enter arc column, do not have an effect substantially with arc column, and a little less than the interference to electric arc, arc stability is good.
3) diameter between inside tube and the outside tungsten electrode end face is poor, and the cooling effect of powder feeding air-flow, makes the inside tube temperature relatively low, can avoid powder to melt bonding in the inside tube duct.
4) owing to adopt nested structure, the outer tungsten electrode diameter of selecting for use is relatively large, is 8～12mm, has guaranteed the allowable current density of the current density of outer tungsten electrode less than tungsten electrode;
5) inside tube adopts gas protecting soldering to be connected with hollow supporting body with outer tungsten electrode, has realized the good cooling of tungsten electrode.
6) adopt the hollow cathode structure, effective heating region of powder expands to whole plasma-arc and plasma jet zone from the jet heating of traditional plasma gun, so the thermal effect that adds of particle improves greatly, thereby can reduce arc power significantly.
Based on These characteristics, adopt the spray gun of this cathode construction to be applicable to spraying various metals, pottery and cermet material, especially pottery and high-melting point metal material can be used as high temperature heat source simultaneously, for example are used for gas treatment.
The present invention can be used as the hollow cathode of plasma spray gun, the effective discharge portion of making negative electrode of outside tungsten, and inside tube is used for that the powders into nozzle is had the powder guide effect; Also can be used for other and have the negative electrode that plasma heating and material are sent function to.
Four, description of drawings
Fig. 1 is the schematic diagram of a kind of typical hollow cathode structure of the present invention.
The schematic diagram of Fig. 2 hollow cathode structure that to be inside tube of the present invention 2 can unite two into one with negative electrode hollow supporting body 1.
The schematic diagram of a kind of more simple structure of Fig. 3 hollow cathode structure that to be inside tube of the present invention 2 can unite two into one with negative electrode hollow supporting body 1.
Fig. 4 is the alumina ceramic coating section microstructure photo for preparing with the microplasma spray gun spraying that the negative electrode that the present invention makes is assembled.
Fig. 5 is the alumina ceramic coating section microstructure photo that traditional high-power plasma spraying prepares.
Five, the specific embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Embodiment 1: referring to Fig. 1.According to technical scheme of the present invention, the hollow cathode structure of plasma spray gun as shown in Figure 1, the hollow supporting body 1 that comprises a paint spray gun negative electrode, the inside tube 2 and the outside tungsten pipe 3 of a band through hole also are set at an end of negative electrode hollow supporting body 1, inside tube 2 is arranged on the through hole with negative electrode hollow supporting body 1, outside tungsten pipe 3 is arranged on the external diameter of an end of negative electrode hollow supporting body 1, has certain clearance between the two tungsten pipes.Adopt red copper as supporter, inside tube 2 and outside tungsten pipe 3 are connected an end of supporter 1, and the tungsten tube material is a cerium tungsten alloy.
Embodiment 2: referring to Fig. 2.According to technical scheme of the present invention, as shown in Figure 2, inside tube 2 is selected the red copper material simultaneously with negative electrode hollow supporting body 1, and both integrate and make an integral body.The scheme of this kind embodiment is comparatively simple.
Embodiment 3: referring to Fig. 3.According to technical scheme of the present invention, as shown in Figure 3, inside tube 2 is selected the red copper material simultaneously with negative electrode hollow supporting body 1, and both integrate and make an integral body, and the section of inside tube no longer exposes, and are deformed into more simple structure as shown in Figure 3.
Embodiment 4: referring to Fig. 4, Fig. 5.Make a hollow cathode according to thinking of the present invention, with it is that negative electrode is made the microplasma spray gun, adopt this spray gun to spray, result of the test shows that under the small-power of 1～3kW spraying coatings prepared performance is suitable in the coating that 20～80kW prepares with traditional plasma gun electric arc.Fig. 4 is the alumina ceramic coating section microstructure photo for preparing with the microplasma spray gun spraying that the negative electrode that the present invention makes is assembled, and as a comparison, Fig. 5 is the aluminum oxide coating layer that traditional high-power plasma spraying prepares.Can find that from two width of cloth figure alumina particle fusing has taken place and formed flat flat preferably particle.When the spray power that the present invention relates to is 3kW and traditional plasma spraying power when being 40kW, preparation typical C u, Ni60, Mo and Al
2O
3The performance of coating is suitable with traditional plasma spraying.
Claims (7)
1. cathode construction that is used for plasma spray gun, at least the hollow supporting body [1], inside tube [2] and the outside tungsten pipe [3] that comprise a paint spray gun negative electrode, it is characterized in that, the inside tube [2] and the outside tungsten pipe [3] of a band through hole also are set at an end of negative electrode hollow supporting body [1], inside tube [2] is arranged on the through hole with negative electrode hollow supporting body [1], outside tungsten pipe [3] is arranged on the outer surface of an end of negative electrode hollow supporting body [1], has certain clearance between inside tube [2] and the outside tungsten pipe [3].
2. a kind of cathode construction that is used for plasma spray gun as claimed in claim 1, it is characterized in that, described supporter [1] is heat conduction and good copper or the Cu alloy material of electric conductivity, the material of described outside tungsten pipe [3] is tungsten or the tungsten alloy that discharge performance is good and fusing point is high, tungsten alloy such as cerium tungsten alloy, thorium tungsten alloy.
3. a kind of cathode construction that is used for plasma spray gun as claimed in claim 1, it is characterized in that, described inside tube [2] material is metal or alloy or pottery or cermet, metal wherein can comprise tungsten, molybdenum, iron, copper, nickel, titanium, vanadium, chromium, cobalt, yttrium, manganese, zirconium, niobium, molybdenum, silver, tantalum, alloy can comprise the alloy of above-mentioned one or more elements, pottery can comprise oxide, nitride, carbide, boride, silicide ceramics, and cermet can comprise the complex that above-mentioned metal or alloy and pottery are formed.
4. a kind of cathode construction that is used for plasma spray gun as claimed in claim 1 is characterized in that described inside tube [2] material is mutually concentric with support bar, and inside tube [2] can unite two into one as a whole structure with negative electrode hollow supporting body [1].
5. a kind of cathode construction that is used for plasma spray gun as claimed in claim 1, it is characterized in that, the end face of described outside tungsten pipe [3] is than the end face height of inside tube [2], and when the neck-in of inside tube [2] end face guaranteed electrode work, arc stability ground burnt at outside tungsten pipe [3] end face.
6. a kind of cathode construction that is used for plasma spray gun as claimed in claim 1 is characterized in that the diameter of bore of described inside tube [2] can be 1～3mm, and wall thickness can be 1～2mm; The internal diameter of outside tungsten pipe [3] can be 3～6mm, and wall thickness can be 3～5mm.
7. a kind of cathode construction that is used for plasma spray gun as claimed in claim 1 is characterized in that, can add some devices or shape on the described supporter [1] in order to fixing or connect other parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031146953A CN1175941C (en) | 2003-04-28 | 2003-04-28 | Cathode structure applicable to plasma painting gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031146953A CN1175941C (en) | 2003-04-28 | 2003-04-28 | Cathode structure applicable to plasma painting gun |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1445023A true CN1445023A (en) | 2003-10-01 |
| CN1175941C CN1175941C (en) | 2004-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031146953A Expired - Fee Related CN1175941C (en) | 2003-04-28 | 2003-04-28 | Cathode structure applicable to plasma painting gun |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106686873A (en) * | 2017-03-04 | 2017-05-17 | 绍兴上虞阿特兰迪电器有限公司 | Detachable non-thermal plasma reactor |
| CN110856332A (en) * | 2019-07-09 | 2020-02-28 | 四川铁匠科技有限公司 | Cathode structure of arc laminar plasma beam generator |
-
2003
- 2003-04-28 CN CNB031146953A patent/CN1175941C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106686873A (en) * | 2017-03-04 | 2017-05-17 | 绍兴上虞阿特兰迪电器有限公司 | Detachable non-thermal plasma reactor |
| CN106686873B (en) * | 2017-03-04 | 2024-02-23 | 绍兴上虞阿特兰迪电器有限公司 | Detachable non-thermal plasma reactor |
| CN110856332A (en) * | 2019-07-09 | 2020-02-28 | 四川铁匠科技有限公司 | Cathode structure of arc laminar plasma beam generator |
| CN110856332B (en) * | 2019-07-09 | 2024-02-27 | 四川铁匠科技有限公司 | Cathode structure of electric arc laminar flow plasma beam generator |
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| Publication number | Publication date |
|---|---|
| CN1175941C (en) | 2004-11-17 |
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Granted publication date: 20041117 Termination date: 20120428 |