KR102170813B1 - Functional coating apparatus by combustion chemical vapor deposition reaction - Google Patents

Abstract

An embodiment of the present invention is a coating in which a device that assists thermal activation of the coating agent is designed to separate the combustion unit and the coating agent supply unit, and allows most of the combustion coating agent of particulates to reach a distant combustion flame. Provide the device. In addition, an embodiment of the present invention provides a functional coating apparatus using a combustion chemical vapor deposition reaction in which a coating agent is atomized in advance before thermal activation to improve a thermal reaction rate. To this end, an embodiment of the present invention is a coating apparatus comprising a combustion unit for generating a flame by mixing fuel and a supporting gas, and a coating agent supply unit for supplying a coating agent to the flame, wherein the coating agent supply unit is the coating agent and the carrier gas A mixing pipe that receives and mixes, and is connected to the mixing pipe, and a coating agent spray nozzle for atomizing by spraying the coating agent mixed with the carrier gas at a predetermined angle, an activation tube connected to the coating agent spray nozzle, and an activation tube in which a heating element is installed, and the Disclosed is a coating apparatus comprising a coating agent spray nozzle connected to an activation tube.

Description

Functional coating device using combustion chemical vapor deposition reaction {FUNCTIONAL COATING APPARATUS BY COMBUSTION CHEMICAL VAPOR DEPOSITION REACTION}

An embodiment of the present invention relates to a functional coating device using a combustion chemical vapor deposition reaction.

Combustion Chemical Vapor Deposition is a field of Chemical Vapor Deposition, in which a solid substance in powder or crystal form is coated on the surface of a target substrate in a combustion environment by a combustion chemical vapor deposition reaction. Say fair. Functional coating materials having various properties can be selectively grown on a substrate according to experimental conditions such as combustion temperature, composition and concentration of coating material, flow rate of fluid, composition and concentration of carrier gas, type and temperature of substrate material.

Depending on the purpose of use, this functional coating material has a heat shield function that blocks heat at high temperatures, an oxidation resistance function that prevents the diffusion of oxygen to inhibit the oxidation of the base material, and helps the decomposition of NO _x and CO, which are harmful to the human body and environment. It can play various roles such as a catalytic function, and has the advantage of being able to locally or selectively coat not only a simple substrate but also a complex substrate.

Conventional domestic technologies using such combustion chemical vapor deposition method include "combustion chemical vapor deposition method of silicon oxide film with excellent adhesion (Registration No. 100742858, 07.07.19)" and similar "combustion of silicon oxide film with excellent adhesion" There is a chemical vapor deposition method (registration number 100742857, 07.07.19)". In this method, fuel (LPG), air, and HMDSN (Hexamethyldsiloxane), a silicon precursor, are mixed and then supplied to a burner with a single nozzle to coat a substrate with silicon oxide having excellent wettability or adhesion. However, there is a disadvantage in that the nozzle of the burner may be clogged by silicon oxide when the usage time elapses or the amount of the precursor is increased. In addition, as a foreign technology, Guardian Industries Corp. In the "remote combustion deposition burner and/or related methods (Application No: 10190212.0)" and "Method and apparatus for the combustion chemical vapor deposition of films and coatings (EP 0689618B1)" developed by There is also a method, and a method of separately supplying the burner and the coating agent is secured. As described above, the method of directly putting the precursor for coating into the burner has a disadvantage that may cause clogging of the nozzle of the burner, and the method of supplying the coating agent by separating the burner from the coating agent is transported with the help of a coating agent or carrier gas. There is a disadvantage in that it is difficult to implement a uniform and fine coating layer because it is difficult to mix by reaching a combustion flame at a distance with only the coating agent.

An embodiment of the present invention is designed by separating the combustion part and the coating agent supply part in order to eliminate the phenomenon that the nozzle is clogged by the coating agent, such as an integrated nozzle, and the thermal of the coating agent so that most of the combustion coating agent of particulates can reach a distant flame. It provides a functional coating device using a combustion chemical vapor deposition reaction in which a device that assists thermal activation is applied to the coating agent supply.

In addition, an embodiment of the present invention provides a functional coating apparatus using a combustion chemical vapor deposition reaction in which a coating agent is atomized in advance before thermal activation to improve a thermal reaction rate.

In the coating apparatus according to an embodiment of the present invention, in the coating apparatus including a combustion unit that generates a flame by mixing fuel and a supporting combustion gas, and a coating agent supply unit that supplies a coating agent to the flame, the coating agent supply unit includes the coating agent and A mixing pipe that carries and mixes the carrier gas, is connected to the mixing pipe, a coating agent spray nozzle that atomizes the coating agent mixed with the carrier gas at a predetermined angle, and an activation tube connected to the coating agent spray nozzle, and a heating element is installed And a coating agent spray nozzle connected to the activation tube.

A filter may be installed between the mixing pipe and the coating agent spray nozzle.

A first sealing member may be installed between the coating agent spray nozzle and the activation tube.

A second sealing member may be installed between the activation pipe and the coating agent spray nozzle.

The second sealing member may be formed of a heat-resistant material.

A net may be installed at the discharge portion of the coating agent spray nozzle.

The coating agent spray nozzle, the activation tube, and the coating agent spray nozzle may be formed of a Ni alloy.

The heating temperature of the heating element may be 50% to 150% based on the boiling point of the coating body.

A control device for controlling the temperature may be installed on the heating element.

The combustion unit is an independent pipe supplying the fuel and the assisting combustible gas, a valve capable of respectively adjusting the flow rate of the tubing, a flow meter, a fuel mixing nozzle for mixing the fuel and the assisting combustible gas, and accelerating the flow velocity of the assisting combustible gas And a fuel injection nozzle configured to completely mix the fuel and the supporting gas and eject it straight to a distance.

The fuel injection nozzle may have an inner angle of 10° to 30°.

The outlet of the fuel injection nozzle may be formed in parallel to have a predetermined length.

At least one outlet of the fuel injection nozzle may be formed.

The fuel may be composed of either LPG or LNG, and the supporting gas may be composed of oxygen.

The functional coating device using the combustion chemical vapor deposition reaction according to an embodiment of the present invention is designed by separating the combustion part and the coating agent supply part in order to eliminate clogging of the nozzle by the coating agent, such as an integrated nozzle, and most of the combustion coating agent of particulates It is possible to reach a distant flame.

In addition, the functional coating apparatus using the combustion chemical vapor deposition reaction according to an embodiment of the present invention may improve a thermal reaction rate by atomizing the coating agent before thermal activation.

1 is a block diagram showing a coating apparatus according to an embodiment of the present invention.
2 is a cross-sectional view showing a spray nozzle and a mixing nozzle of a combustion unit of a coating apparatus according to an embodiment of the present invention.
3 is a cross-sectional view showing a coating agent supply unit of the coating apparatus according to an embodiment of the present invention.

A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings to the extent that those skilled in the art can easily implement the present invention.

1 is a configuration diagram showing a coating device according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing a spray nozzle and a mixing nozzle of the combustion unit of the coating device according to an embodiment of the present invention, Figure 3 A cross-sectional view showing a coating agent supply part of the coating apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a coating apparatus according to an embodiment of the present invention includes a coating object 101 such as a substrate, a coating layer 102 coated on the coating object 101, and a combustion unit 200 for creating a combustion environment. And it includes a coating agent supply unit 300 that can send the coating agent 103 to the flame (F).

The fuel supplied to the combustion unit 200 is supplied from the fuel storage container 207, and the fuel storage container 207 may supply fuel at a differential pressure by increasing the internal pressure, or a separate pump may be used. The fuel from the fuel storage container 207 can be monitored and controlled through a flow meter or a pressure gauge 206, and the size and combustion state of the flame F can be adjusted with the fuel control valve 205. The control valve 205 and the fuel mixing nozzle 203 are connected through a fuel supply pipe 204.

In addition, the auxiliary combustion gas supplied to the combustion unit 200 receives the supply from the auxiliary combustion gas storage container 211, the flow rate is monitored by the flow meter or pressure gauge 210, and the amount of the auxiliary combustion gas is controlled by the control valve 209 ) To control. Each part from the supporting combustion gas storage container 211 to the mixing nozzle 203 is connected through a gas supply pipe 208.

Here, referring to FIG. 2, the structure of the burner of the combustion unit 200 includes a fuel injection nozzle 202 and a fuel mixing nozzle 203. The length Ln of the fuel mixing nozzle 203 connected to the fuel injection nozzle 202 is long enough so that heat due to the combustion flame F is not transmitted to the supply pipes 204 and 208 and the valves 205 and 209. do. Further, by setting the inner injection angle θ of the fuel injection nozzle 202 to 10° to 30°, the flow is accelerated to completely mix the fuel and the supporting gas. In particular, the outlet side is made parallel so that the fuel can be ejected straight. Since the flow rate (u) of the mixed gas in the fuel injection nozzle 202 of the combustion unit 200 is proportional to the flow rate (v) of the mixed gas and the inner diameter (a) of the outlet side of the fuel injection nozzle 202, the combustion unit 200 The inner diameter of the outlet side of the fuel injection nozzle 202 of) is determined in consideration of the size of the coating layer 102 or the flame F of the material to be coated 101.

Here, the fuel may be composed of LPG or LNG, and the supporting gas may be composed of oxygen or air.

Referring to FIG. 3 together, the coating agent supply unit 300 includes a line 301 to 310 for spraying a coating agent, a line 311 to 314 for supplying a coating agent, and a line 315 to 318 for supplying a gas carrying the coating agent. It consists of a heating element control device 319.

Here, the method of supplying the coating agent 103 and the carrier gas from the coating agent supply unit 300 to the coating agent spray nozzle 310 is similar to that of the combustion unit 200. The coating agent is supplied from the coating agent storage container 314, the flow rate is monitored by a flow meter or pressure gauge 313, and the injection amount is adjusted through the control valve 312.

Here, an inert gas such as nitrogen or argon may be used as the carrier gas, and when the coating agent is finally discharged from the coating agent spray nozzle 306, it helps atomizing the coating agent. The advantage of using a carrier gas is that an effective spray pattern can be obtained with only a small amount of coating.

Hereinafter, the lines 301 to 310 for spraying the coating agent will be described, the coating agent supply pipe 311 is fastened to the mixing pipe 302 through the first connection part 301. Of course, the mixing pipe 302 and the first connecting portion 301 may prevent leakage of the coating agent by using a sealing member 303 such as a rubber ring.

In addition, the carrier gas supply pipe 315 is fastened to the mixing pipe 302 through the second connection part 304.

That is, the mixing pipe 302 serves to mix the coating agent supplied from the first connection part 301 and the carrier gas supplied from the second connection part 304. Impurities or large particulate matter mixed with the coating agent and the carrier gas can be removed through the filter 305 installed in front of the spray nozzle 306. The filter 305 may be formed of stainless steel or a similar material in the form of a mesh.

The coating agent spray nozzle 306 is mixed in the mixing pipe 302, and the coating agent and the carrier gas that have passed through the filter 305 are completely mixed and atomized.

Here, the coating agent spray nozzle 306 can adjust the flow rate and spray angle (A1) of the coating agent through the differential pressure and diameter (D3), and by adjusting the spray angle (A1) and the spray distance (D2) The injection range (D1) of can be determined.

Here, preferably, a net 306a for facilitating atomization of the coating agent is installed at the discharging portion, that is, the end of the coating agent spray nozzle 306.

Of course, the coating agent spray nozzle 306, the activation pipe 307, and the spray nozzle 310 may be connected by first and second sealing members 308 such as rubber rings to prevent leakage of the coating agent. However, since the two sealing members 308 in contact with the activated nozzle heated by the heating element 309 can be easily deteriorated at high temperature, it can be sealed by replacing it with a metal or a high temperature material depending on the situation.

The coating agent micronized through the coating agent spray nozzle 306 is thermally activated in the activation tube 307. In this section, the activation temperature is preferably determined based on the boiling point of the coating agent. More preferably, the activation temperature, that is, the heating temperature of the heating element 309 is formed from 50% to 150% based on the boiling point of the coating body. When heated above the boiling point of the coating agent, the particulated coating agent is evaporated to make a mixed gas completely mixed with the carrier gas. In addition, since the carrier gas mixed with the coating agent is in a gaseous state, when the temperature increases, the energy of the gas molecules increases, and the volume expands in proportion to the temperature. This is according to Charles' law (V=Vo*(1+t/273), which is discharged to the coating agent spray nozzle 310 and the thermally activated coating agent can reach a long distance. However, if the thermal activation temperature is excessively increased here, That is, when the boiling point of the coating agent reaches about 150% or more, the coating agent may be oxidized and adsorbed on the inner surface of the activation tube 307 to cause clogging at the outlet.

The heating element 309 is formed to surround the outer surface of the activation tube 307, and the heating element control device 319 is connected to one side to generate heat by itself or receive a heat source. Accordingly, the heating element 309 is preferably formed of a metal or non-ferrous metal having excellent thermal conductivity.

Of course, the heat source of the heating element 309 is preferably installed to be transmitted to the activation tube 307 without external loss.

The inner diameter (D4) of the coating agent injection nozzle 310, which is a discharge nozzle, is installed in consideration of the injection distance of the coating agent, and the discharge port of the injection nozzle 310 is preferably formed in parallel so that the fuel can be ejected straight.

Of course, the coating agent spray nozzle 306, the activation tube 307, the spray nozzle 310 is preferably formed of a material such as Ni-based alloy or stainless steel, which is a material having excellent heat resistance.

Table 1 below is a comparison of the spray distance of the coating agent according to the presence/absence of thermal activation of the coating agent in an embodiment of the present invention.

Thermal activation radish U Coating spray distance (cm) 17.5 44.7

As a result of spray pattern measurement, before heating the coating agent spray nozzle 306, the coating agent spraying distance was limited to 17.5 cm or less in a short distance, and there was a problem that the coating agent droplets that were not partially micronized were condensed, but the coating agent was heated above the boiling point (thermal If activated), it is possible to stably and uniformly spray the coating agent over a long distance of 44.7cm or more even at a low carrier gas pressure (or flow rate).

It is obvious to those of ordinary skill in the art that the present invention is not limited to the above embodiments and can be variously modified and modified within the scope not departing from the technical gist of the present invention. will be.

101; Coating object 102; Coating layer
200; Combustion section 300; Coating body supply

Claims (14)

In the coating apparatus comprising a combustion unit for generating a flame by mixing fuel and a supporting gas, and a coating agent supply unit for supplying a coating agent to the flame,
The combustion unit and the coating agent supply unit are arranged separately,
The combustion unit is connected to the fuel storage container and the supporting gas container through separate pipes,
The coating agent supply unit is connected to the coating agent storage container and the carrier gas container through separate pipes,
The coating agent supply unit,
A mixing pipe for receiving and mixing the coating agent and the carrier gas through separate pipes;
A coating agent spray nozzle connected to the mixing pipe and spraying the coating agent mixed with the carrier gas at a predetermined angle and spray distance to make microparticles;
An activation tube connected to the coating agent spray nozzle and having a heating element installed on an outer circumferential surface thereof to heat the particulated coating agent to a boiling point or higher to vaporize and mix it with the carrier gas to thermally activate it; And
A coating agent spray nozzle connected to the activation pipe and spraying the thermally activated coating agent; Coating device comprising a. The method of claim 1,
A coating device, characterized in that a filter is installed between the mixing pipe and the coating agent spray nozzle. The method of claim 1,
Coating apparatus, characterized in that the first sealing member is installed between the coating agent spray nozzle and the activation tube. The method of claim 1,
Coating apparatus, characterized in that the second sealing member is installed between the activation pipe and the coating agent spray nozzle. The method of claim 4,
The coating device, characterized in that the second sealing member is formed of a heat-resistant material. The method of claim 1,
Coating device, characterized in that the net is installed in the discharge portion of the coating agent spray nozzle. The method of claim 1,
Coating device, characterized in that the coating agent spray nozzle, the activation tube and the coating agent spray nozzle are formed of Ni alloy. The method of claim 1,
Coating apparatus, characterized in that the heating temperature of the heating element is 50% to 150% based on the boiling point of the coating agent. The method of claim 8,
Coating device, characterized in that the control device for controlling the temperature is installed on the heating element. The method of claim 1,
The combustion unit is an independent pipe supplying the fuel and the supporting combustion gas, a valve and a flow meter capable of respectively adjusting the flow rate of the pipe, a fuel mixing nozzle mixing the fuel and the supporting combustion gas, and accelerating the flow velocity of the auxiliary combustion gas And a fuel injection nozzle configured to completely mix the fuel and the supporting gas and eject it straight to a long distance. The method of claim 10,
Coating apparatus, characterized in that the inner angle of the fuel injection nozzle is formed from 10 ° to 30 °. The method of claim 10,
Coating apparatus, characterized in that the outlet of the fuel injection nozzle is formed in parallel to have a predetermined length. The method of claim 12,
Coating apparatus, characterized in that at least one outlet of the fuel injection nozzle is formed. The method of claim 10,
The coating apparatus, characterized in that the fuel is composed of either LPG or LNG, and the supporting gas is composed of oxygen.

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