CN113677441A - Thermal spraying method - Google Patents
Thermal spraying method Download PDFInfo
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- CN113677441A CN113677441A CN202080028968.9A CN202080028968A CN113677441A CN 113677441 A CN113677441 A CN 113677441A CN 202080028968 A CN202080028968 A CN 202080028968A CN 113677441 A CN113677441 A CN 113677441A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/08—Flame spraying
- B05D1/10—Applying particulate materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
- B05B7/20—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
- B05B7/20—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion
- B05B7/201—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle
- B05B7/205—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle the material to be sprayed being originally a particulate material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/08—Flame spraying
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Nozzles (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention provides a thermal spraying method, which can inhibit the reduction of adhesion and the generation of abrasion and tempering of a discharge conduit when a large amount of spraying is carried out. The thermal spraying method of the invention is that a mixture obtained by mixing raw material powder containing fire-resistant powder and combustible powder and combustion-supporting carrier gas is sprayed and combusted to form a fire-resistant composition, and the flow rate of the carrier gas sprayed from a spraying nozzle (32) of an injector (30) is 30 (Nm)3H) or more, the discharge nozzle (32) for discharging the liquidThe flow rate of the carrier gas is set to be 602(m/s) to 1180(m/s), the flow rate of the mixture in the flow path of the discharge duct (33) is set to be 63(m/s) to 283(m/s), and the ratio of the cross-sectional area of the linear portion of the discharge duct (33) to the ejection port (41) of the ejection unit (40) (the cross-sectional area of the ejection port of the ejection unit/the cross-sectional area of the linear portion of the discharge duct) is set to be 1 to 4.
Description
Technical Field
The invention relates to a spraying method based on an aluminothermic spraying method.
Background
Conventionally, as a thermal spraying apparatus for forming a refractory composition by an aluminothermic spraying method, there is known a thermal spraying apparatus for forming a refractory composition by carrying, spraying and burning (igniting and melting) a raw material powder containing a refractory powder (refractory aggregate) and a combustible powder (for example, metal powder) by a combustion-supporting carrier gas (oxygen) (for example, patent document 1).
Specifically, patent document 1 describes a technique in which a carrier gas is ejected into an injector through an ejection nozzle, a raw material powder and the carrier gas are mixed in the injector, the mixed mixture is guided to the downstream side along a conduit (discharge conduit) of a conveyance path, the mixture is ejected by an ejection means, and the ejected mixture is burned to form a refractory composition.
Patent document
Patent document 1: japanese patent No. 5814699 publication
Disclosure of Invention
In such a thermal spraying technique, in order to efficiently and rapidly form a desired refractory composition, it is necessary to spray (mass spray) a large amount of raw material powder serving as a raw material of the refractory composition. However, the present inventors have found that the following problems (1) to (3) are present when the present inventors have performed a large-volume spray test using the spray apparatus of patent document 1.
(1) When a large amount of spray is performed, the spray amount inevitably increases, and therefore, the adhesion of the raw material powder to the surface to be worked (hereinafter simply referred to as "adhesion") is reduced by the rebound loss.
(2) When a large amount of the mixture is sprayed, the frequency of the mixture contacting the conduit (discharge conduit) of the conveying path increases, and the discharge conduit is worn.
(3) If the cross-sectional area of the injection port of the injection means is increased in order to perform a large amount of injection, the flow velocity of the mixture injected from the injection port is decreased, and the risk of occurrence of flashback (a phenomenon in which combustion progresses in a direction opposite to the conveying direction of the mixture) is increased.
The term "large-amount spraying" in the present invention means that the spraying amount of the raw material powder is about 100kg/h or more.
Accordingly, an object of the present invention is to provide a thermal spraying method capable of suppressing a decrease in adhesion and occurrence of abrasion and tempering of a discharge pipe when a large amount of spray is performed.
The present inventors have found, as a result of further experiments and studies, that 4 parameters "the flow rate of the carrier gas", "the flow rate of the carrier gas discharged from the discharge nozzle", "the flow rate of the mixture in the flow path of the discharge conduit" and "the ratio of the cross-sectional areas of the discharge port of the discharge means and the linear portion of the discharge conduit (the cross-sectional area of the discharge port of the discharge means/the cross-sectional area of the linear portion of the discharge conduit)" are parameters which are particularly important for solving the above-mentioned problems, and have completed the present invention by determining appropriate ranges of these parameters.
That is, according to an aspect of the present invention, the following thermal spraying method is provided.
A thermal spraying method using a thermal spraying apparatus for forming a refractory composition by spraying and burning a mixture of a raw material powder containing a refractory powder and a combustible powder and a combustion assisting carrier gas,
the injection quantity of the raw material powder is more than 100kg/h,
the spraying device is provided with: a storage unit that stores the raw material powder and has an outlet through which the raw material powder is discharged;
an ejector that sucks the raw material powder from the discharge port by a pressurized gas flow of a carrier gas and mixes the carrier gas and the raw material powder to obtain the mixture;
and an injection unit that injects the mixture generated by the injector,
the ejector is provided with: a container portion having an internal space communicating with the discharge port;
a discharge nozzle that discharges the pressurized carrier gas from a tip end toward the internal space;
and a discharge duct having one end communicating with the internal space and guiding the mixture from the one end to the other end along a flow path,
the flow rate of the carrier gas was 30 (Nm)3The reaction time is more than the first hour),
the flow velocity of the carrier gas ejected from the ejection nozzle is 602(m/s) to 1180(m/s),
the flow velocity of the mixture in the flow path of the discharge conduit is 63(m/s) to 283(m/s),
the ratio of the cross-sectional area of the ejection opening of the ejection unit to the cross-sectional area of the linear portion of the discharge conduit (cross-sectional area of the ejection opening of the ejection unit/cross-sectional area of the linear portion of the discharge conduit) is 1 or more and 4 or less.
According to the present invention, when a large amount of ejection is performed, the decrease in adhesion and the occurrence of abrasion and tempering of the ejection tube can be suppressed.
Drawings
FIG. 1 is a schematic view (cross-sectional view) showing an example of a deposition apparatus used in the deposition method of the present invention.
Description of the symbols
10-raw material powder; 20-hopper (storage unit); 21-a discharge port; 30-an ejector; 31-a container portion; 31 a-a constriction; 32-a spray nozzle; 33-a spitting catheter; 40-a spray unit (spray nozzle); 41-ejection port (nozzle hole); 50-horizontal conveying pipe; 50 a-an inner liner layer; 60-rubber hose; 70-vertical conveying pipe.
Detailed Description
FIG. 1 schematically shows an example of a thermal spraying apparatus used in the thermal spraying method of the present invention.
The spraying device includes a hopper 20 as a storage means for storing the raw material powder 10, an injector 30, and a spraying means 40.
The raw material powder 10 is configured to contain a combustible powder (for example, a metal powder) and a refractory powder (refractory aggregate).
The hopper 20 has a discharge port 21 for discharging the raw material powder 10 at the bottom thereof.
The ejector 30 sucks the raw material powder 10 from the discharge port 21 by a pressurized gas flow of the carrier gas (oxygen gas), and mixes the carrier gas and the raw material powder 10 to form a mixture.
The injection unit (injection nozzle) 40 is connected to the outlet side of the injector 30 via a horizontal duct 50 and a rubber hose 60, and injects the mixture generated by the injector 30 from an injection port (nozzle hole) 41 at the tip. Further, the horizontal duct 50 may be omitted, and the rubber hose 60 may be directly connected to the outlet side of the ejector 30.
Next, the structure of the ejector 30 will be described in detail. The ejector 30 includes: a container portion 31 having an internal space communicating with a discharge port 21 at the bottom of the hopper 20; a tapered discharge nozzle 32 for discharging the pressurized carrier gas from the tip end into the internal space of the container portion 31; and a discharge conduit 33 having one end communicating with the internal space of the container portion 31 and guiding the mixture from the one end to the other end along a flow path. That is, the carrier gas is ejected at a high speed from the ejection port (nozzle hole) at the tip of the tapered ejection nozzle 32 toward one end (base end) of the ejection conduit 33 in the internal space of the container portion 31, whereby the internal space of the container portion 31 is made negative pressure (pressure lower than atmospheric pressure in this case). On the other hand, the discharge port 21 of the hopper 20 communicates with the internal space of the container portion 31 through the vertical duct 70. Therefore, the injector 30 sucks the raw material powder 10 from the discharge port 21 into the internal space of the container portion 31 by the pressurized flow of the carrier gas, and the carrier gas discharged from the discharge port (nozzle hole) at the tip of the discharge nozzle 32 and the raw material powder 10 are mixed in the internal space of the container portion 31 to form a mixture.
In the ejector 30, the discharge conduit 33 is formed only by a straight portion having a constant cross-sectional area of the flow path, but a constricted portion or an expanded portion may be provided on the inlet side and the outlet side of the straight portion.
In the ejector 30, the inner space of the container portion 31 has a constricted portion 31a, which decreases in cross-sectional area of the flow path of the mixture toward the discharge conduit 33. The tip end portion (ejection port (nozzle hole)) of the ejection nozzle 32 is located in a space region in the constricted portion 31 a. With such a configuration, the ejection effect can be improved, and a large amount of ejection can be easily performed.
When the thermal spraying is performed using this thermal spraying apparatus, first, the raw material powder 10 is discharged from the discharge port 21 of the hopper 20 (discharging step). Next, the raw material powder 10 is introduced into the container portion 31 of the ejector 30 having an internal space that communicates with the discharge port 21 of the hopper 20 via the vertical transport pipe 70 (introduction step), the raw material powder 10 introduced in the introduction step is sucked by the flow of the carrier gas in the ejector 30 (suction step), and the raw material powder 10 and the carrier gas are mixed (mixing step). Thereafter, the mixture mixed in the mixing step is conveyed along the flow path of the discharge duct 33 (conveying step), the conveyed mixture is sprayed by the spraying means 40 (spraying step), and the sprayed mixture is burned to form a refractory composition (forming step).
The thermal spraying method of the present invention using the above-described spray type thermal spraying apparatus is characterized by satisfying the following requirements 1 to 4.
Requirement 1: the flow rate of the carrier gas was 30 (Nm)370 (Nm) < h >3H) below.
Requirement 2: the flow velocity of the carrier gas ejected from the ejection nozzle is 602(m/s) or more and 1180(m/s) or less.
Requirement 3: the flow velocity of the mixture in the flow path of the discharge conduit is 63(m/s) to 283 (m/s).
Requirement 4: the ratio of the cross-sectional area of the ejection opening of the ejection unit to the cross-sectional area of the linear portion of the discharge conduit (cross-sectional area of the ejection opening of the ejection unit/cross-sectional area of the linear portion of the discharge conduit) is 1 to 4.
Regarding the requirement 1, if the flow rate of the carrier gas is less than 30 (Nm)3H), the carrying ability of the raw material powder is insufficient, and a large amount of spraying cannot be achieved. On the other hand, in the case of a liquid,from the viewpoint of mass injection, although the upper limit of the flow rate of the carrier gas is not particularly limited, it can be practically 80 (Nm)3And/h) or so.
The preferred range of carrier gas flow is 40 (Nm)370 (Nm) < h >3H) below.
The "flow rate of the carrier gas" in the present invention refers to the flow rate of the gas ejected from the ejection nozzle. That is, in the thermal spraying apparatus of fig. 1, although a gas (oxygen gas) having the same composition as the carrier gas may be introduced from a portion other than the ejection nozzle 32, for example, from the rubber hose 60, the flow rate of the gas introduced from the portion other than the ejection nozzle 32 is not regarded as being included in the "flow rate of the carrier gas".
Regarding requirement 2, if the flow velocity of the carrier gas ejected from the ejection nozzle (hereinafter simply referred to as "carrier gas flow velocity") is less than 602(m/s), a sufficient ejection effect cannot be obtained, and a large amount of ejection cannot be achieved. On the other hand, if the flow velocity of the carrier gas is greater than 1180(m/s), although a large amount of ejection can be achieved, the conveyance flow velocity of the raw material powder increases due to the increase in the flow velocity of the carrier gas, and the wear in the discharge conduit increases.
The preferable range of the flow rate of the carrier gas is 699(m/s) to 1148 (m/s).
The flow velocity of the carrier gas can be obtained by calculation from the cross-sectional area of the discharge port (nozzle hole) of the discharge nozzle and the flow rate of the carrier gas.
Regarding requirement 3, if the flow velocity of the mixture in the flow path of the discharge conduit is less than 63(m/s), the amount of the raw material powder sucked by the ejection is insufficient, and a large amount of ejection cannot be achieved. On the other hand, if the flow velocity of the mixture in the flow path of the discharge conduit is greater than 283(m/s), abrasion in the discharge conduit is likely to occur.
The flow rate of the mixture in the flow path of the discharge conduit is preferably in the range of 72(m/s) to 172 (m/s).
The flow velocity of the mixture in the flow path of the discharge conduit can be obtained by calculation from the cross-sectional area of the straight portion of the discharge conduit and the flow rate of the carrier gas.
Regarding requirement 4, if the ratio of the cross-sectional area of the ejection orifice of the ejection means to the linear portion of the discharge conduit (the "cross-sectional area of the ejection orifice of the ejection means/the cross-sectional area of the linear portion of the discharge conduit", hereinafter simply referred to as "cross-sectional area ratio") is less than 1, the flow velocity of the mixture ejected from the ejection orifice of the ejection means becomes excessively large, and the adhesion is reduced by the rebound loss. In addition, since the pressure loss at the injection port of the injection unit increases, the injection amount of the mixture decreases, and a large amount of injection cannot be achieved. On the other hand, if the cross-sectional area ratio is larger than 4, the flow velocity of the mixture ejected from the ejection port of the ejection unit becomes too small and tempering easily occurs.
The preferable range of the cross-sectional area ratio is 1.4 or more and 2.3 or less.
The "cross-sectional area of the ejection port of the ejection unit" refers to the opening area of the ejection port, and when there are a plurality of ejection ports, the sum of the opening areas of all the ejection ports is used. The term "cross-sectional area of the linear portion of the discharge conduit" refers to a cross-sectional area of the linear portion of the discharge conduit in a cross-section orthogonal to the flow path direction of the discharge conduit.
In the spraying apparatus of fig. 1, the cross-section of the ejection opening 41 of the spraying unit 40 and the ejection conduit 33 (linear portion) is circular, but may be other than circular, such as oval or rectangular. That is, the cross-sectional area ratio may be within the range defined in requirement 4, regardless of the shape of the ejection orifice of the ejection unit and the linear portion of the ejection conduit.
As described above, since the thermal spraying method of the present invention satisfies all of the requirements 1 to 4, it is possible to suppress the decrease in adhesion and the occurrence of wear and tempering of the discharge pipe when a large amount of spraying is performed.
Examples
The thermal spraying test was performed by the thermal spraying apparatus of fig. 1 under each thermal spraying condition shown in table 1, and the respective spraying amounts (kg/h), adhesion, and the occurrence and non-occurrence of wear and tempering of the discharge pipe were evaluated, and a comprehensive evaluation was performed based on the evaluation results. In the thermal spraying test, 85 mass% of silicon dioxide (SiO) was used2) As a refractory powderAnd a raw material powder composed of 15 mass% of metallic silicon as a combustible powder, the raw material powder (mixture) being sprayed with a stream of a carrier gas (oxygen) at 0.5 MPa.
The evaluation method of each evaluation item is as follows.
Injection volume (kg/h)
The ejection volume (kg/h) is determined from the weight reduction rate of the raw material powder stored in the hopper 20. When the injection amount is 100(kg/h) or more, it is considered that a large amount of injection can be achieved as o (good), and when it is less than 100kg/h, it is considered that a large amount of injection cannot be achieved as x (impossible).
Adhesion Property
The adhesion rate of the raw material powder was determined from the total injection amount (kg) of the raw material powder and the rebound loss (kg) at room temperature, and the adhesion rate of comparative example 1 was defined as 100, and was thus indexed and evaluated. Specifically, the value is "good" when the adhesion ratio (index) is greater than 110, and is "fair" when the adhesion ratio is greater than 100 and less than 110, and is "poor" when the adhesion ratio is less than 100.
Wear of discharge conduit
After the spray test, the abrasion state of the discharge tube visually observed was relatively evaluated by 3 ranks of ∘, Δ, and ×. That is, the abrasion loss of the discharge duct was reduced to a large value in the order of ∘,. DELTA.and.times.
Whether or not tempering occurs
The spray test was repeated 100 times, and the number of tempering cycles was 0 times, Δ (ok) when the number of tempering cycles was 1 time, and x (not) when the number of tempering cycles was 2 or more.
Comprehensive evaluation
When all the evaluations are good, the evaluation is Δ (ok) when there is at least one Δ although there is no × and is x (ok) when there is at least one ×.
TABLE 1
Since examples 1 to 7 shown in table 1 all satisfy all of the requirements 1 to 4 of the present invention, there was no x (impossibility) in the evaluation of the ejection amount, the adhesion, the abrasion of the discharge duct and the occurrence of the tempering, and the overall evaluation was good or fair, and good results were obtained.
In contrast, in comparative example 1, the flow rate of the carrier gas was small, the conveying ability of the raw material powder was insufficient, and the large-amount ejection could not be achieved.
Comparative example 2 is an example in which the flow rate of the carrier gas is low, and a sufficient ejection effect cannot be obtained, and a large amount of ejection cannot be achieved.
On the other hand, in comparative example 3, the flow rate of the carrier gas was high, and the abrasion amount of the discharge pipe was large.
Comparative example 4 is an example in which the flow rate of the mixture in the flow path of the discharge conduit is low, and the amount of the raw material powder sucked by the ejection is insufficient, and a large amount of ejection cannot be achieved.
On the other hand, comparative example 5 is an example in which the flow rate of the mixture in the flow path of the discharge conduit is high, and the abrasion amount of the discharge conduit is large.
In comparative example 6, the cross-sectional area was relatively small, and the flow velocity of the mixture injected from the injection port 41 of the injection unit 40 was too high, and the adhesion was reduced by the rebound loss. Further, the pressure loss at the injection port 41 of the injection unit 40 becomes large, and as a result, the injection amount decreases and a large amount of injection cannot be achieved.
On the other hand, in comparative example 7, which is an example having a relatively large cross-sectional area, the flow velocity of the mixture injected from the injection port 41 of the injection means 40 is low, and tempering is likely to occur.
Claims (3)
1. A thermal spraying method using a thermal spraying apparatus for forming a refractory composition by spraying and burning a mixture of a raw material powder containing a refractory powder and a combustible powder and a combustion assisting carrier gas,
the injection quantity of the raw material powder is more than 100kg/h,
the spraying device is provided with: a storage unit that stores the raw material powder and has an outlet through which the raw material powder is discharged;
an ejector that sucks the raw material powder from the discharge port by a pressurized gas flow of a carrier gas and mixes the carrier gas and the raw material powder to obtain the mixture;
and an injection unit that injects the mixture generated by the injector,
the ejector is provided with: a container portion having an internal space communicating with the discharge port;
a discharge nozzle that discharges the pressurized carrier gas from a tip end toward the internal space;
and a discharge duct having one end communicating with the internal space and guiding the mixture from the one end to the other end along a flow path,
the flow rate of the carrier gas was 30 (Nm)3The reaction time is more than the first hour),
the flow velocity of the carrier gas ejected from the ejection nozzle is 602(m/s) to 1180(m/s),
the flow velocity of the mixture in the flow path of the discharge conduit is 63(m/s) to 283(m/s),
the ratio of the cross-sectional area of the linear portion of the discharge conduit to the cross-sectional area of the ejection orifice of the ejection means, i.e., the cross-sectional area of the ejection orifice of the ejection means/the cross-sectional area of the linear portion of the discharge conduit, is 1 to 4.
2. A sputtering method according to claim 1,
the inner space of the container part has a constriction part which reduces the cross-sectional area of the flow path of the mixture toward the discharge conduit,
the tip end portion of the discharge nozzle is located in a space region inside the constricted portion.
3. A sputtering method according to claim 1 or 2,
the flow rate of the carrier gas was 40 (Nm)370 (Nm) < h >3The ratio of the total amount of the carbon atoms to the total amount of the carbon atoms is less than h),
the flow velocity of the carrier gas is higher than 699(m/s) and lower than 1148(m/s),
the flow velocity of the mixture in the flow path of the discharge conduit is 72(m/s) to 172(m/s),
the ratio of the cross-sectional area of the ejection orifice of the ejection unit to the cross-sectional area of the linear portion of the discharge conduit, i.e., the cross-sectional area of the ejection orifice of the ejection unit/the cross-sectional area of the linear portion of the discharge conduit, is 1.4 to 2.3.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-095440 | 2019-05-21 | ||
| JP2019095440A JP6619901B1 (en) | 2019-05-21 | 2019-05-21 | Thermal spraying method |
| PCT/JP2020/019480 WO2020235493A1 (en) | 2019-05-21 | 2020-05-15 | Thermal spraying method |
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| Publication Number | Publication Date |
|---|---|
| CN113677441A true CN113677441A (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202080028968.9A Pending CN113677441A (en) | 2019-05-21 | 2020-05-15 | Thermal spraying method |
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| JP (1) | JP6619901B1 (en) |
| CN (1) | CN113677441A (en) |
| WO (1) | WO2020235493A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103764296A (en) * | 2011-08-25 | 2014-04-30 | 黑崎播磨株式会社 | Thermal-spraying device, thermal-spraying method, and thermal-spraying material |
| JP2015113490A (en) * | 2013-12-11 | 2015-06-22 | 黒崎播磨株式会社 | Spray coating apparatus |
| JP2017019699A (en) * | 2015-07-13 | 2017-01-26 | 品川リフラクトリーズ株式会社 | Thermal spray material |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4230750A (en) * | 1979-08-15 | 1980-10-28 | Eutectic Corporation | Metallo-thermic powder |
| AT369067B (en) * | 1981-01-22 | 1982-12-10 | Plasser Bahnbaumasch Franz | TWIN PLUG UNIT FOR TRACK MACHINES |
| JP6079958B2 (en) * | 2012-12-26 | 2017-02-15 | 品川リフラクトリーズ株式会社 | Powder transport apparatus and powder transport method |
| JP5660343B2 (en) * | 2013-03-15 | 2015-01-28 | 品川リフラクトリーズ株式会社 | Thermal spray equipment |
| JP6422101B2 (en) * | 2013-12-25 | 2018-11-14 | Ｊｆｅスチール株式会社 | Thermal spray repair method for furnace wall |
| JP6429317B2 (en) * | 2013-12-25 | 2018-11-28 | Ｊｆｅスチール株式会社 | Thermal spray repair method for furnace wall |
| JP6518161B2 (en) * | 2015-07-27 | 2019-05-22 | 黒崎播磨株式会社 | Thermal spray installation method |
| JP6560802B1 (en) * | 2018-10-12 | 2019-08-14 | 黒崎播磨株式会社 | Thermal spraying method |
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2019
- 2019-05-21 JP JP2019095440A patent/JP6619901B1/en active Active
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2020
- 2020-05-15 WO PCT/JP2020/019480 patent/WO2020235493A1/en active Application Filing
- 2020-05-15 CN CN202080028968.9A patent/CN113677441A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103764296A (en) * | 2011-08-25 | 2014-04-30 | 黑崎播磨株式会社 | Thermal-spraying device, thermal-spraying method, and thermal-spraying material |
| JP2015113490A (en) * | 2013-12-11 | 2015-06-22 | 黒崎播磨株式会社 | Spray coating apparatus |
| JP2017019699A (en) * | 2015-07-13 | 2017-01-26 | 品川リフラクトリーズ株式会社 | Thermal spray material |
Non-Patent Citations (3)
| Title |
|---|
| 刘光临: "《流体输送》", 30 June 1993, 水利电力出版社 * |
| 张辉等: "《水泥船建造工艺》", 30 September 1980, 人民交通出版社 * |
| 欧阳光耀等: "《柴油机高压共轨喷射技术》", 30 November 2012, 国防工业出版社 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020190011A (en) | 2020-11-26 |
| WO2020235493A1 (en) | 2020-11-26 |
| JP6619901B1 (en) | 2019-12-11 |
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