We do not use industrial gases, so it is very low cost. The gas temperature can be selected between 450°C and 800°C.
【Device Overview】 This is a new thermal spraying device developed through joint research with Oshima National College of Maritime Technology and Oita National College of Technology, which resolves the issues of conventional HVAF (High Velocity Air Fuel) and lowers the gas temperature to a level comparable to traditional cold spray using inert gases. 【Features】 ○ The gas temperature can be selected between 450°C and 800°C. ○ The operating gas is combustion gas from kerosene and compressed air. Since nitrogen and helium are not used, significant reductions in operating costs are possible. ○ The operating pressure varies depending on the compressor and other equipment used. ○ It is capable of processing powders that are less than a few micrometers in size, which have poor fluidity and are prone to agglomeration. ○ The powder is fed axially. 【Operating Costs】 Approximately 1,500 yen per hour (when using a 37KW compressor).
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basic information
The length of the combustion chamber and the shape of the barrel can be changed. It is composed of a globe plug, first combustion chamber, second combustion chamber, third combustion chamber, powder mixing chamber, Laval nozzle, and barrel, rather than being integrated. The orientation of the powder mixing chamber can be freely changed in the horizontal direction. ● For more details, please contact us or download the catalog.
Price information
7.5 million yen (including control panels and adjustment equipment) (does not include pneumatic equipment that sends compressed air to devices such as compressors and air tanks)
Price range
P6
Delivery Time
※Production will be made to order after the operating environment has been determined.
Applications/Examples of results
Like regular cold spray, it can form a film without melting metal powders such as aluminum and copper. Films exceeding 1 cm in thickness can also be produced. It is possible to work with powders of several micrometers or less, which have poor fluidity and are prone to aggregation. In the fiscal year 2018, there were also achievements in contract processing from universities.
Detailed information
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HVAF for low-temperature thermal spraying
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Ignition switch Main combustion chamber kerosene flow meter and needle valve Swirl and fine air flow meter, needle valve, etc.
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Control panel Flow meters and flow controllers for combustion chambers 1 to 3 Kerosene flow meter for the pilot combustion section
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Appearance of the equipment before construction
catalog（1）
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Company information
SSS Co., Ltd. is a company specializing in contract processing of thermal spraying, primarily focusing on HVAF thermal spraying. HVAF uses combustion gases from kerosene and compressed air as the working gas. Because the combustion temperature is low, when spraying cermet (WC-based) materials primarily aimed at wear resistance, by using HVAF, by-products such as W2C, which typically occur with HVOF, do not form. If the temperature of HVAF can be lowered to the temperature range of cold spray or warm spray, it can reduce operating costs since it does not use industrial gases. However, liquid fuels have a narrower range for maintaining stable combustion compared to gaseous fuels, making it difficult with existing thermal spraying equipment. To address the above issues, we developed "Low-Temperature HVAF for Thermal Spraying" through joint research with Oshima National College of Maritime Technology. The working gas temperature can be adjusted between 450 and 800°C. Since we do not use industrial gases, we have a cost advantage. Additionally, there is a challenge in the stable supply of fine powders below several micrometers in dry spraying. To solve this problem, we are conducting joint research with Oita National College of Technology. Although practical application is still pending, a prototype has been completed, and it has reached a stage where it can be tested without issues in our in-house contract processing.
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