2.5 plastic
2.5 plastic
2.5 plastic
2.5 Plastic
2.5 Plastic
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HVOF process allows flexible changes from particle heat ratio to particle kinetic energy (velocity). This dual control is suitable for spraying plastics.
HVOF process allows flexible changes from particle heat ratio to particle kinetic energy (velocity). This dual control is suitable for spraying plastics.
HVOF process allows flexible changes from particle heat ratio to particle kinetic energy (velocity). This dual control is suitable for spraying plastics.
HVOF process allows a flexible change of the thermal ratio of the particles to the particle kinetic energy (velocity) of this double coating of plastic adaptively controlled.
HVOF process allows a flexible change of the thermal ratio of the particles to the particle kinetic energy (velocity) of this double coating of plastic adaptively controlled.
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Both thermoplastics and thermosetting plastics can be used as complete coatings without affecting their basic chemical structure and specific properties.
Both thermoplastics and thermosetting plastics can be used as complete coatings without affecting their basic chemical structure and specific properties.
Both thermoplastics and thermosetting plastics can be used as complete coatings without affecting their basic chemical structure and specific properties.
Thermoplastics and thermosetting plastics can be applied as a complete coating without affecting their basic chemical structure and specific energy.
Thermoplastics and thermosetting plastics can be applied as a complete coating without affecting their basic chemical structure and specific energy.
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2.6 Other new materials
2.6 Other new materials
2.6 Other new materials
2.6 Other new materials
2.6 Other new materials
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Various alloy compositions deposited by HVOF spray guns are continuously being developed, including superalloys, new MCrAIY compositions, amorphous alloys and unique quasi-crystalline compositions, as well as titanium carbide/molybdenum and titanium carbide-tungsten carbide/molybdenum compositions, etc.
Various alloy compositions deposited by HVOF spray guns are continuously being developed, including superalloys, new MCrAIY compositions, amorphous alloys and unique quasi-crystalline compositions, as well as titanium carbide/molybdenum and titanium carbide-tungsten carbide/molybdenum compositions, etc.
Various alloy compositions deposited by HVOF spray guns are continuously being developed, including superalloys, new MCrAIY compositions, amorphous alloys and unique quasi-crystalline compositions, as well as titanium carbide/molybdenum and titanium carbide-tungsten carbide/molybdenum compositions, etc.
HVOF gun by depositing various alloy constituents are constantly being developed, comprising a superalloy, a new composition MCrAIY, amorphous alloy and a unique quasi-crystalline components, and titanium carbide / molybdenum carbide and titanium - tungsten / molybdenum component and the like, they are
HVOF gun by depositing various alloy constituents are constantly being developed, comprising a superalloy, a new composition MCrAIY, amorphous alloy and a unique quasi-crystalline components, and titanium carbide / molybdenum carbide and titanium - tungsten / molybdenum component and the like, they are
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Can provide superior wear resistance, as well as high coverage and low cost.
Can provide superior wear resistance, as well as high coverage and low cost.
Can provide superior wear resistance, as well as high coverage and low cost.
can provide superior wear resistance, and high coverage and low cost.
can provide superior wear resistance, and high coverage and low cost.
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3 development direction
3 development direction
3 development direction
3 development direction
3 development direction
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3.1 HVIF system
3.1 HVIF system
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3.1 HVIF system
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Although there are many types of supersonic flame spraying systems available on the market, they all have a common problem that is the barrel clogging. In order to solve this problem and completely eliminate the oxides in the thermal spray coating, J.B. Browning first proposed a new thermal spray process idea in 1992-Supersonic Impact Melting Spray (HVIF). The theoretical basis of the HVIF concept is that the violent expansion of the spraying fuel stream from the high-pressure combustion chamber to the atmospheric environment will cause the temperature of the spraying fuel stream to drop significantly, which may make the temperature of the supersonic fuel stream entered by the sprayed particles It is lower than the melting point of the particles, so as to ensure that the sprayed particles will not melt but only be softened before hitting the surface of the substrate, so that the barrel will not be blocked. When the sprayed particles hit the surface of the substrate at a very high speed, the heat generated by the impact will melt the particles and form a coating. The outstanding feature of this thermal spraying process method is to minimize the possibility of chemical reactions such as oxidation of spray particles during the spraying process, and it also solves the problem of blockage of the supersonic flame spraying gun barrel. Browning's preliminary experiments show that the density of HVIF coating reaches almost 100%, and the bonding strength between the coating and the substrate is also very high, so HVIF is one of the future development trends of supersonic flame spraying.
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3.2 HVAF system
3.2 HVAF system
3.2 HVAF system
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HVAF is a supersonic flame spraying technology that uses compressed air instead of oxygen for combustion. It has the advantages of low cost and good coating quality.
HVAF is a supersonic flame spraying technology that uses compressed air instead of oxygen for combustion. It has the advantages of low cost and good coating quality.
HVAF is a supersonic flame spraying technology that uses compressed air instead of oxygen for combustion. It has the advantages of low cost and good coating quality.
HVAF using a HVOF technique of compressed air instead of oxygen for combustion with low cost, good coating quality advantages.
HVAF using a HVOF technique of compressed air instead of oxygen for combustion with low cost, good coating quality advantages.
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HVOF spraying uses oxygen to assist combustion, which is easy to cause material oxidation, and the cost is also high.For example, JP~5000, according to the typical process parameters adopted by TAFA company, the required oxygen flow is 0.9438m3/min, and each bottle of oxygen can be maintained for 5-6 minutes.
HVOF spraying uses oxygen to assist combustion, which is easy to cause material oxidation, and the cost is also high.For example, JP~5000, according to the typical process parameters adopted by TAFA company, the required oxygen flow is 0.9438m3/min, and each bottle of oxygen can be maintained for 5-6 minutes.
HVOF spraying uses oxygen to assist combustion, which is easy to cause material oxidation, and the cost is also high.For example, JP~5000, according to the typical process parameters adopted by TAFA company, the required oxygen flow is 0.9438m3/min, and each bottle of oxygen can be maintained for 5-6 minutes.
HVOF spraying using oxygen combustion, easy to cause oxidation of the material cost is also high, such as JP ~ 5000, according to the typical process parameters TAFA Company employed, the flow rate of oxygen required 0.9438m3 / min, the oxygen can be maintained bottle 5 ~ 6 min
HVOF spraying using oxygen combustion, easy to cause oxidation of the material cost is also high, such as JP ~ 5000, according to the typical process parameters TAFA Company employed, the flow rate of oxygen required 0.9438m3 / min, the oxygen can be maintained bottle 5 ~ 6 min
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; HVAF uses compressed air, which saves the cost of oxygen.
; HVAF uses compressed air, which saves the cost of oxygen.
; HVAF uses compressed air, which saves the cost of oxygen.
; HVAF compressed air, oxygen cost savings.
; HVAF compressed air, oxygen cost savings.
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From the point of view of coating performance, since HVOF flame temperature is generally 3000℃, particle velocity is 350-650m/s, while HVAF flame temperature is only 2000℃, particle velocity can reach 1000-1200m/s, so it can inhibit material oxidation.
From the point of view of coating performance, since HVOF flame temperature is generally 3000℃, particle velocity is 350-650m/s, while HVAF flame temperature is only 2000℃, particle velocity can reach 1000-1200m/s, so it can inhibit material oxidation.
From the point of view of coating performance, since HVOF flame temperature is generally 3000℃, particle velocity is 350-650m/s, while HVAF flame temperature is only 2000℃, particle velocity can reach 1000-1200m/s, so it can inhibit material oxidation.
From the coating performance point of view, since the HVOF combustion flame temperature is generally 3000 deg.] C, a particle velocity of 350-650m / s, and the combustion flame temperature is only 2000 HVAF deg.] C, particle speed up 1000- 1200m / s, oxidation of the material can be suppressed
From the coating performance point of view, since the HVOF combustion flame temperature is generally 3000 deg.] C, a particle velocity of 350-650m / s, and the combustion flame temperature is only 2000 HVAF deg.] C, particle speed up 1000- 1200m / s, oxidation of the material can be suppressed
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It decomposes with WC, the residual stress is low, and the bonding strength is better. Therefore, HVAF is also one of the important development directions of supersonic flame spraying technology.
It decomposes with WC, the residual stress is low, and the bonding strength is better. Therefore, HVAF is also one of the important development directions of supersonic flame spraying technology.
It decomposes with WC, the residual stress is low, and the bonding strength is better. Therefore, HVAF is also one of the important development directions of supersonic flame spraying technology.
and WC phase decomposition, low residual stress, better bond strength, and therefore, one is currently an important development direction HVAF HVOF technique.
and WC phase decomposition, low residual stress, better bond strength, and therefore, one is currently an important development direction HVAF HVOF technique.
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In recent years, various countries have competed to study the air supersonic flame spray system (HAVF). The United States, Britain, Japan and other developed countries have successfully developed the HVAF system. my country's HVAF system has also been successfully developed, but the application is still relatively small
3.3 SHS and HVOF combined system The temperature of supersonic flame spraying is lower than that of plasma spraying, so it is not suitable for spraying high melting point metal and ceramic materials. If the self-propagating High-temperature Syn-thesis (SHS) technology is combined with the supersonic flame spraying technology, the high exothermic reaction system material is used as the spraying material, and the spraying material emits a lot of heat when it is synthesized. It is superimposed with flame heat to increase the temperature of the droplet, which can melt, spheroidize and refine the high melting point ceramic hard phase, improve the bond between the metal and the ceramic, thereby improving the bond between the coating and the substrate and the coating layer At the same time, the supersonic speed can shorten the oxidation time of the droplet in the air, and achieve a high-quality coating with a nearly non-porous, low-oxygen structure. Therefore, the combination of self-propagating high-temperature synthesis technology and supersonic flame spraying technology is also one of the future development trends of supersonic flame spraying. Perhaps the final thermal spraying technology is a combined system that combines the high thermal energy advantages of plasma spraying and the non-porous and oxide-free characteristics of supersonic spraying-with unlimited control plus complete operation. If such a system is developed, Thermal spraying will be more widely used in the field of anti-wear and corrosion.
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