CN201143468Y - Laval nozzle for cold spraying - Google Patents
Laval nozzle for cold spraying Download PDFInfo
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- CN201143468Y CN201143468Y CN 200820016424 CN200820016424U CN201143468Y CN 201143468 Y CN201143468 Y CN 201143468Y CN 200820016424 CN200820016424 CN 200820016424 CN 200820016424 U CN200820016424 U CN 200820016424U CN 201143468 Y CN201143468 Y CN 201143468Y
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- air passage
- probe interface
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Abstract
The utility model relates to a Laval nozzle which is used for a supersonic contrasting pipe structure of cold sprayed titanium and aluminium metal coat, belonging to hot spraying field of surface disposal engineering. The mainbody structure of the nozzle comprises a main air passage inlet, a main powder inlet air passage, an auxiliary powder inlet air passage, a pressure probe interface, a temperature probe interface, a supersonic nozzle, a fixed bolt, an air chamber body, an air piston structure and a washer; the air chamber body and the air chamber body structure are fixedly connected as a nozzle mainbody which is a symmetrical integrated structure by the fixed bolt; the center of the rear end of the nozzle mainbody is provided with the main powder inlet air passage which is obliquely provided with the main air passage inlet in an inserting way; the upper side and the lower side of the air chamber body of the nozzle mainbody are respectively provided with the pressure probe interface and the temperature probe interface; the main air passage inlet and the main powder inlet air passage are respectively convergent and communicated in the supersonic nozzle in the nozzle body from the air; the spraying mouth of the supersonic nozzle is provided with the auxiliary powder inlet air passage; the speed of gains along the interface direction can be obviously reduced and the spraying can be carried out by normal typical nozzles.
Description
Technical field:
The utility model belongs to the field of thermal spray of Surface Treatment Engineering, and what be specifically related to a kind of rapid shaping formula supersonic speed convergent-divergent tubular construction that is used for cold spraying titanium and aluminum metal coating draws your nozzle of valve.
Background technology:
When cold spraying aluminium and titanium etc. need the metal of higher critical velocity, carrier gas and metal need be heated simultaneously, again because the surface-active of aluminium and titanium is very strong, at high temperature be easy to react with oxygen, make the cold spraying coating porosity height that makes, degree of oxidation is also high, causes coating performance to reduce.Simultaneously, traditional thermal spraying draws valve that convergent-divergent pipe when being used for cold spraying, because unreasonable structure makes the coating generation type be not suitable for the quick uniform preparation of cold spraying coating.
The former title cold-air powered spraying method of cold spray process (CGSM:Cold gas-dynamic sprayMethod).20th century the mid-80, Russian Academy Of Sciences is located at the theory and the applied mechanics research institute in Novorossiysk city, Siberia, when carrying out the experiment of supersonic speed air channel loaded particle stream, spaceship is corroded in the observation of being carried out, professor A.N.PAPYRIN who presides over this work draws a surprising discovery: when particle speed surpassed certain certain value, the wear effects of particle can change into very strong adhesion.Be with this understanding, professor A.N.PAPARIN migrates the U.S., and accepts the support of a tame automobile making financial group.Declare patent the end of the year 1994 and in a thermal spraying meeting, propose cold spraying first.In the professor of this Russia work in the future, have two personages to play key effect: one is the P.Heinrich of German woods moral (LINDE) gas companies, and he is an executive committee member of German thermal spraying association; Another one is the Kreye professor of hamburger university of Armed Forces of connection portion.Because their participation, facilitate and set up that " " center " is responsible in thermal spraying, becomes the joint project of this university and gas companies.In after this 2 years, to the advantage of this new technology and potential characteristics in hamburger and Munich adopt identical equipment to do systematic research.Wherein, this university pays attention to theoretical question, and the LINDE gas companies is then concentrated the application problem of development equipment.At the year ends 2000, cold spraying obtains commercial Application first, has set up cold air Craft Inc. in the recent period again, becomes the supplier that a family holds the cold spray apparatus of license.
Cold spraying is the raising and the development of traditional hot spraying technology as a kind of emerging Surface Treatment Engineering new technology.The principle of cold spray process is solid-state down at low temperature, and high speed impact makes that the metal of particle and bottom surface is broken realizes the atomic structure combination, by bigger plastic deformation be deposited on form on the matrix surface fine and close, in conjunction with firm coating.Its concrete principle is: high-voltage power supply makes gas produce high pressure, and push the work forward gas and powder feeding carrier gas are quickened; Heater is provided with two covers, makes carrier gas and work gas be preheating to certain temperature respectively; Powder feeder is under state with pressure powder to be sent in the spray gun, and the spray gun rear portion is the chamber thorax, and powder mixes with work gas herein, enters nozzle through trunnion.Work gas is to produce medium at a high speed, is preheating to 100-600 ℃ at heater before entering bore, to add bulky grain (1～50um) flow velocity to 300～1200m/s.Carrier gas becomes axially powder to be sent into spray gun through powder feeder after another heater is heated, and nozzle arrangements is a convergence-diffused laval nozzle, so that gas obtains quickening.Nozzle has different geometric formats, and the spraying air-flow is different flow regimes with the difference of nozzle, and wherein nozzle also is considerable parts in the cold spray process process.
At present, U.S. Pat 6722584, Chinese patent 00253384.7,96211942.3 and 200510083138.3 etc. to cold spraying with drawing your (laval) nozzle of valve to design.But these nozzles are for the easy coating such as the aluminium of sticking easy oxidation and titanium and being not suitable for of spraying, boundary effect when particularly not considering the cold spraying rapid shaping, usually in the edge effect of spray-on coating marginal existence, influence the speed and the effect of spray mo(u)lding, and its structure of nozzle complexity, manufacturing process is also loaded down with trivial details.
Summary of the invention:
The purpose of this utility model is to overcome the shortcoming that exists in the prior art, seek to provide a kind of be used for the metal cold spraying draw your formula nozzle of valve, can with spraying during soft material powder the clogging of nozzle throat is reduced to minimum, and when the spraying hard material, nozzle is not easy wearing and tearing.Also be to provide a kind of and the powder speed at outlet position can be controlled at the velocity amplitude scope of concentrating, for rapid shaping and the uniform coating of preparation physical property provide possibility.
To achieve these goals, the utility model agent structure comprises that main liquid passage inlet, master advance the powder gas circuit, pay powder gas circuit, pressure probe interface, temp probe interface, superonic flow nozzzle, set bolt, air chamber body, air chamber structure and pad; Air chamber body and air chamber split structure are connected through set bolt and are the nozzle body of axis symmetrical expression integrative-structure, nozzle body rearward end center is shaped on the master and advances the powder gas circuit, the master advances powder gas circuit upside angle-inserting type and is shaped on main liquid passage inlet, the air chamber body of nozzle body is shaped on pressure probe interface and temp probe interface respectively in both sides up and down, main liquid passage inlet and main advance the powder gas circuit and in the nozzle body inner chamber, be compiled in respectively and communicate in superonic flow nozzzle, the spout place of its superonic flow nozzzle is shaped on and pays the powder gas circuit; The front portion structure of superonic flow nozzzle adopts the plain nozzle structure, is conical converging transition, and the rear portion is circular to square gradual change type structure, to the exit; Convergent-divergent pipe converging transition partly is processed into taper shape, throat is to exporting by circle to the transition of rectangle slit, the expansion ratio of convergent-divergent pipe is between 5.0～9.0, VELOCITY DISTRIBUTION in the exit is even, effectively reduce the porosity of cold spraying titanium coating and the problem of oxidation of solution aluminized coating, the powder speed at outlet position is controlled at the velocity interval of concentrating, for rapid shaping and the uniform coating of preparation physical property provide possibility.
The utility model is pressed the design of superonic flow nozzzle theory structure, and utilizes hydrodynamics software FLUENT to calculate the acceleration behavior of alumina particles in nozzle (common pyramid type nozzle), wherein by the theoretical expansion ratio (4 * L that calculates
e* W
e/ π D
t 2) be 9 gas Mach Number Distribution, outlet is 3.81 Mach, with theory calculate consistent, be respectively temperature and expansion ratio to particle outlet speed influence, this is the acceleration behavior of axial location alumina particles.For diameter is the alumina particles of 20um, adopts this nozzle, can reach the critical speed of aluminium at 420K (150 ℃).The fusing point of various aluminium is about 680 ℃, about 230 ℃ of the operating temperature of permission, and technological temperature generally can not produce nozzle throat and stop up much smaller than 1/3 of fusing point.When the spray titanium, temperature is higher than 1/3 of titanium fusing point (1672 ℃) about 700 ℃, be easy to nozzle is resulted in blockage.Be directed to this, the powder feeding mouth of powder is opened after the throat of nozzle, the diameter of powder feeding mouth is opened at this at 2～4mm, with a little more than the powder feeding of air taking port pressure, calculate through FLUENT, for the speed influence of particle less than 20m/s.
During the actual spraying of the utility model, axially particle only accounts for a very little part, so for the particle of different parts, its speed differs greatly, traditional pyramid type nozzle, horizontal direction decline at jet expansion is very fast, when causing spraying, when outlet diameter is the nozzle fixed point spraying of 10mm, effectively sedimentation diameter only has 2mm～3mm (coating layer thickness 0.5mm), adopt improved square outlet nozzle 2mm * 10mm, during the fixed point spraying, effectively depositional area can reach 2mm * 6mm.
Be divided into symmetrical two parts processing during the processing of the utility model structure of nozzle, utilize line cutting technology, on two blocks of stainless steels, draw out the structure of half respectively, again two halves are welded, form complete superonic flow nozzzle, wherein D
tCan be controlled between 1.5mm～3mm, the controllable size of outlet is between 2mm * 10mm～3mm * 15mm, and the area that still must be controlled at outlet is 5～9 times of throat opening area; The supersonic speed partial-length is between 150mm～240mm.
The utility model compared with prior art by appropriate design cold spraying structure of nozzle and accelerating performance, can significantly reduce particle and fall along the speed of interface direction, sprays by designing typical nozzle simultaneously.
Description of drawings:
Fig. 1 is a package assembly principle schematic of the present utility model.
The specific embodiment:
Agent structure when the utility model is implemented comprises that main liquid passage inlet 2, master advance powder gas circuit 1, pay powder gas circuit 11, pressure probe interface 3, temp probe interface 4, superonic flow nozzzle 5, set bolt 6 and 7, air chamber body 8, air chamber 9 and pad 10; 9 fens body structures of air chamber body 8 and air chamber are connected through set bolt 6 and 7 and are the nozzle body of axis symmetrical expression integrative-structure, nozzle body rearward end center is shaped on the master and advances powder gas circuit 1, the master advances powder gas circuit 1 upside angle-inserting type and is shaped on main liquid passage inlet 2, the air chamber body of nozzle body is shaped on pressure probe interface 3 and temp probe interface 4 respectively in both sides about in the of 8, main liquid passage inlet 2 and mainly advance powder gas circuit 1 and in the nozzle body inner chamber, be compiled in respectively and communicate in superonic flow nozzzle 5, the spout place of its superonic flow nozzzle 5 is shaped on and pays powder gas circuit 11; The front portion structure of superonic flow nozzzle 5 adopts the plain nozzle structure, is conical converging transition, and the rear portion is circular to square gradual change type structure, to the exit.
Be divided into symmetrical two parts processing during the processing of the utility model structure of nozzle, utilize line cutting technology, on two blocks of stainless steels, draw out the structure of half respectively, again two halves are welded, form complete superonic flow nozzzle, wherein D
tCan be controlled between 1.5mm～3mm, the controllable size of outlet is between 2mm * 10mm～3mm * 15mm, and the area that still must be controlled at outlet is 5～9 times of throat opening area; The supersonic speed partial-length is between 150mm～240mm.
Embodiment:
Press the nozzle of the utility model design preparation, its supersonic speed part 180mm, nozzle throat Φ 2, outlet size 2mm * 10mm, convergence segment length 40mm, convergent angle 60 degree.200 ℃ of normal temperature of carrier gas temperature are ejection aluminium sample down, and wherein adhesion is greater than 20MPa, and deposition efficiency is greater than 80%, and the deposition part of fixed point spraying is the 5mm height approximately.
Claims (2)
1. a cold spraying is used draws your nozzle of valve, agent structure comprises main liquid passage inlet, the master advances the powder gas circuit, pay the powder gas circuit, the pressure probe interface, the temp probe interface, superonic flow nozzzle, set bolt, the air chamber body, air chamber structure and pad, it is characterized in that air chamber body and air chamber split structure are connected through set bolt is the nozzle body of axis symmetrical expression integrative-structure, nozzle body rearward end center is shaped on the master and advances the powder gas circuit, the master advances powder gas circuit upside angle-inserting type and is shaped on main liquid passage inlet, the air chamber body of nozzle body is shaped on pressure probe interface and temp probe interface respectively in both sides up and down, main liquid passage inlet and main advance the powder gas circuit and in the nozzle body inner chamber, be compiled in respectively and communicate in superonic flow nozzzle, the spout place of its superonic flow nozzzle is shaped on and pays the powder gas circuit; The front portion structure of superonic flow nozzzle adopts the plain nozzle structure, is conical converging transition, and the rear portion is circular to square gradual change type structure, to the exit.
2. cold spraying according to claim 1 is used draws your nozzle of valve, it is characterized in that convergent-divergent pipe converging transition partly is processed into taper shape, throat to outlet by circle to the transition of rectangle slit, the expansion ratio of convergent-divergent pipe is between 5.0～9.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820016424 CN201143468Y (en) | 2008-01-09 | 2008-01-09 | Laval nozzle for cold spraying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200820016424 CN201143468Y (en) | 2008-01-09 | 2008-01-09 | Laval nozzle for cold spraying |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201143468Y true CN201143468Y (en) | 2008-11-05 |
Family
ID=40080342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200820016424 Expired - Lifetime CN201143468Y (en) | 2008-01-09 | 2008-01-09 | Laval nozzle for cold spraying |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201143468Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101116849B (en) * | 2007-07-31 | 2010-05-19 | 中国船舶重工集团公司第七二五研究所 | De-Laval-Type nozzle for cold spraying |
| CN102225388A (en) * | 2011-04-01 | 2011-10-26 | 中国船舶重工集团公司第七二五研究所 | Method for preparing metallic antifouling coating of ship sea chest |
| CN108500275A (en) * | 2018-04-18 | 2018-09-07 | 西安交通大学 | A kind of part increasing material manufacturing device and method of high-compactness and low residual stress |
| CN109843591A (en) * | 2016-10-11 | 2019-06-04 | 易福仁科技私人有限公司 | The method for forming 3D object |
| CN110799669A (en) * | 2017-07-05 | 2020-02-14 | 等离子技术工业株式会社 | Cold spray gun and cold spray equipment with same |
-
2008
- 2008-01-09 CN CN 200820016424 patent/CN201143468Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101116849B (en) * | 2007-07-31 | 2010-05-19 | 中国船舶重工集团公司第七二五研究所 | De-Laval-Type nozzle for cold spraying |
| CN102225388A (en) * | 2011-04-01 | 2011-10-26 | 中国船舶重工集团公司第七二五研究所 | Method for preparing metallic antifouling coating of ship sea chest |
| CN109843591A (en) * | 2016-10-11 | 2019-06-04 | 易福仁科技私人有限公司 | The method for forming 3D object |
| CN110799669A (en) * | 2017-07-05 | 2020-02-14 | 等离子技术工业株式会社 | Cold spray gun and cold spray equipment with same |
| CN110799669B (en) * | 2017-07-05 | 2021-09-28 | 等离子技术工业株式会社 | Cold spray gun and cold spray equipment with same |
| CN108500275A (en) * | 2018-04-18 | 2018-09-07 | 西安交通大学 | A kind of part increasing material manufacturing device and method of high-compactness and low residual stress |
| CN108500275B (en) * | 2018-04-18 | 2019-11-26 | 西安交通大学 | A kind of part increasing material manufacturing device and method of high-compactness and low residual stress |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20081105 Effective date of abandoning: 20080109 |