Development and application of supersonic flame spraying technology(6)

       

Several Mach knots can be seen at the exit of the barrel.

Several Mach knots can be seen at the exit of the barrel.

Several Mach knots can be seen at the exit of the barrel.

It can be seen at the barrel outlet Mach number of the section.

It can be seen at the barrel outlet Mach number of the section.

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Due to the flow of high-temperature gas in the combustion chamber, nozzles and gun barrels, the walls of the vessel must be cooled.

Due to the flow of high-temperature gas in the combustion chamber, nozzles and gun barrels, the walls of the vessel must be cooled.

Due to the flow of high-temperature gas in the combustion chamber, nozzles and gun barrels, the walls of the vessel must be cooled.

Due to the combustion chamber, the gun nozzle flow profile and high temperature gas, it is necessary to cool the walls.

Due to the combustion chamber, the gun nozzle flow profile and high temperature gas, it is necessary to cool the walls.

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The spray gun uses kerosene as fuel, and its spraying cost is only about 1/10 of that of hydrogen and 1/5 of that of propylene. It is available everywhere and is stored safely.

The spray gun uses kerosene as fuel, and its spraying cost is only about 1/10 of that of hydrogen and 1/5 of that of propylene. It is available everywhere and is stored safely.

The spray gun uses kerosene as fuel, and its spraying cost is only about 1/10 of that of hydrogen and 1/5 of that of propylene. It is available everywhere and is stored safely.

The spray gun using kerosene as fuel, which costs about one-tenth the spraying of hydrogen and propylene, 1/5, and widely available, safe storage.

The spray gun using kerosene as fuel, which costs about one-tenth the spraying of hydrogen and propylene, 1/5, and widely available, safe storage.

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The standard for judging the pros and cons of the HVOF spray system is the quality of the coating.

The standard for judging the pros and cons of the HVOF spray system is the quality of the coating.

The standard for judging the pros and cons of the HVOF spray system is the quality of the coating.

HVOF spray system to judge the merits of standard coating quality.

HVOF spray system to judge the merits of standard coating quality.

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The factors that determine the quality of thermal spray coatings are: high combustion chamber pressure-high fuel flow velocity-high particle flying velocity-high coating quality.

The factors that determine the quality of thermal spray coatings are: high combustion chamber pressure-high fuel flow velocity-high particle flying velocity-high coating quality.

The factors that determine the quality of thermal spray coatings are: high combustion chamber pressure-high fuel flow velocity-high particle flying velocity-high coating quality.

Factors determining the quality of the thermal spray coating as: high combustion chamber pressure - high flow velocity of fuel - a high flying velocity of particles - high coating quality.

Factors determining the quality of the thermal spray coating as: high combustion chamber pressure - high flow velocity of fuel - a high flying velocity of particles - high coating quality.

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The JP-5000 spraying system just conforms to this principle. It has the highest combustion chamber pressure at present, and the flying speed of its sprayed particles can reach 1000m/s~l200m/s, so the coating made by spraying has very high bonding strength and

The JP-5000 spraying system just conforms to this principle. It has the highest combustion chamber pressure at present, and the flying speed of its sprayed particles can reach 1000m/s~l200m/s, so the coating made by spraying has very high bonding strength and

The JP-5000 spraying system just conforms to this principle. It has the highest combustion chamber pressure at present, and the flying speed of its sprayed particles can reach 1000m/s~l200m/s, so the coating made by spraying has very high bonding strength and

JP-5000 spray system was in line with this principle, it has the highest combustion chamber pressure, the flying velocity of particles sprayed up to 1000m / s ~ l200m / s, so that the coating produced by spraying a very high bond strength and

JP-5000 spray system was in line with this principle, it has the highest combustion chamber pressure, the flying velocity of particles sprayed up to 1000m / s ~ l200m / s, so that the coating produced by spraying a very high bond strength and

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The density and the oxide content are also very low. The first reason is that the flame temperature of HVOF is low, and the other is that the particle's flying speed is fast, which makes the particle's oxidation exposure time in the air very short.

The density and the oxide content are also very low. The first reason is that the flame temperature of HVOF is low, and the other is that the particle's flying speed is fast, which makes the particle's oxidation exposure time in the air very short.

The density and the oxide content are also very low. The first reason is that the flame temperature of HVOF is low, and the other is that the particle's flying speed is fast, which makes the particle's oxidation exposure time in the air very short.

density, but very low oxide content, which is one reason for low HVOF flame temperature, and then due to a flight speed of the particles, so that the oxide particles in the air exposure time is very short.

density, but very low oxide content, which is one reason for low HVOF flame temperature, and then due to a flight speed of the particles, so that the oxide particles in the air exposure time is very short.

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Especially when making WC-Co coatings by spraying, the process characteristics of the JP-5000 spraying system are particularly prominent, because WC particles are prone to decarburization and decomposition reactions at high temperatures.

Especially when making WC-Co coatings by spraying, the process characteristics of the JP-5000 spraying system are particularly prominent, because WC particles are prone to decarburization and decomposition reactions at high temperatures.

Especially when making WC-Co coatings by spraying, the process characteristics of the JP-5000 spraying system are particularly prominent, because WC particles are prone to decarburization and decomposition reactions at high temperatures.

Especially when sprayed WC-Co coating production, process characteristics JP-5000 spray systems especially, at high temperatures because the WC particles are prone to decarburization decomposition reaction.

Especially when sprayed WC-Co coating production, process characteristics JP-5000 spray systems especially, at high temperatures because the WC particles are prone to decarburization decomposition reaction.

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2　Materials and their applications

2　Materials and their applications

2　Materials and their applications

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As can be seen from Table 1, HVOF coating is characterized by high bonding strength, high hardness, low porosity, and low oxide content.

As can be seen from Table 1, HVOF coating is characterized by high bonding strength, high hardness, low porosity, and low oxide content.

As can be seen from Table 1, HVOF coating is characterized by high bonding strength, high hardness, low porosity, and low oxide content.

As it can be seen from Table 1, HVOF coatings bond strength characteristics, high hardness, porosity, low oxide content.

As it can be seen from Table 1, HVOF coatings bond strength characteristics, high hardness, porosity, low oxide content.

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HVOF spraying has excellent low temperature and high speed characteristics, which is especially suitable for spraying tungsten carbide materials with good wear resistance. Because spraying under high temperature and oxidation conditions, it is difficult to avoid WC decarburization and decomposition.

HVOF spraying has excellent low temperature and high speed characteristics, which is especially suitable for spraying tungsten carbide materials with good wear resistance. Because spraying under high temperature and oxidation conditions, it is difficult to avoid WC decarburization and decomposition.

HVOF spraying has excellent low temperature and high speed characteristics, which is especially suitable for spraying tungsten carbide materials with good wear resistance. Because spraying under high temperature and oxidation conditions, it is difficult to avoid WC decarburization and decomposition.

HVOF spray having excellent low-temperature high rate characteristics, which is particularly suitable for spraying good wear resistance of tungsten carbide-based material, because the high temperature and oxidizing conditions at spraying is difficult to avoid decomposition WC decarburization.

HVOF spray having excellent low-temperature high rate characteristics, which is particularly suitable for spraying good wear resistance of tungsten carbide-based material, because the high temperature and oxidizing conditions at spraying is difficult to avoid decomposition WC decarburization.

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In addition to tungsten carbide materials, chromium carbide materials, certain metal materials, ceramic materials, etc., are very suitable for HVOF, and have their own applications in different fields [1].

In addition to tungsten carbide materials, chromium carbide materials, certain metal materials, ceramic materials, etc., are very suitable for HVOF, and have their own applications in different fields [1].

In addition to tungsten carbide materials, chromium carbide materials, certain metal materials, ceramic materials, etc., are very suitable for HVOF, and have their own applications in different fields [1].

In addition to the tungsten carbide-based material, chromium carbide material, some metal, ceramic material, they are very suitable HVOF, have their application in various fields [1].

In addition to the tungsten carbide-based material, chromium carbide material, some metal, ceramic material, they are very suitable HVOF, have their application in various fields [1].

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There are six commonly used coating materials.

There are six commonly used coating materials.

There are six commonly used coating materials.

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2.1　 Tungsten carbide materials 　　 HVOF technology was first applied on WC-Co alloys. Compared with plasma spraying, HVOF has a lower flame temperature and a fast particle speed, so the residual stress of the coating is low, the bonding strength is high, the oxide is less, the density is high, and the coating performance is more superior. Tungsten carbide coating materials generally include WC/10Ni, WC/10Co, WC/10Co4Cr, etc. These coating materials can provide very good wear and corrosion resistance. 　　HVOF technology has the characteristics of low temperature and high speed. When spraying tungsten carbide coating materials, the oxidation and decomposition of tungsten carbide phase is inhibited, and the wear resistance characteristics of tungsten carbide phase are retained, so the coating has excellent wear resistance. This kind of coating has good effect on key mechanical parts. It has been widely used on the surface of the screw of injection molding machine, the edge of the cutting die of the granulator, and the anti-wear coating on the working surface of the wire drawing tower wheel. In recent years, the HVOF spraying process has begun to be applied in the manufacture of aircraft landing gear, and has gradually replaced the hard chromium plating process in the manufacture of some parts. Compared with the traditional chromium plating process, HVOF sprayed tungsten carbide coating has the advantages of small porosity, high bonding strength, high hardness, and high deposition rate, and because it does not contact acid, it avoids the impact of hydrogen embrittlement on parts. It also avoids serious pollution to the environment, so HVOF spraying is an ideal alternative to hard chromium electroplating.