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Advantages and disadvantages of high - speed gas spraying technology and its use

Author: langfeng Time: 2017-09-12

Advantages and disadvantages of high - speed gas spraying technology and its use

The most prominent advantage of high-speed gas spraying is the ability to spray high-quality tungsten carbide coatings. Coating is dense, high bonding strength, low oxide content. It is used in aviation and space technology, pumps and compressor shafts, valves, sealing surfaces, papermaking rollers, and petrochemical industries where wear and corrosion resistance is required. HVOF has higher bonding strength, lower oxide content, better abrasion resistance and higher deposition rate than plasma coating. The coating can be thicker due to lower internal stress in the coating. And HVOF spraying the need to control the parameters of only half of the plasma spray, so the spray is simple, good quality coating repeatability.Due to the low temperature of HVOF, it is generally not suitable for the spraying of ceramic materials. However, some spray guns (such as Top Gun, HV-2000) have a high heating capacity, can be very dense ceramic coating.
The use of HVOF coating instead of hard chrome plating has been a great success. This eliminates the need for very difficult plating waste treatment problems, but also solve the thick coating (0.5mm above) plating difficulties.
HVOF coating quality improvement to the application of thermal spray coating has also been a new leap. Sprayed Inconel coatings have successfully solved some of the stress corrosion problems. The use of HVOF coatings to replace the corrosion-resistant surfacing layer also has progressing optimally.
The drawback of HVOF is the high cost of use and high noise, which requires very high thermal power in order to heat the particles at very high particle speeds, requiring very high fuel and oxygen consumption. A considerable proportion of heat to be lost in the cooling water. For example, JP-5000 at work, the cooling water away 80kW, accounting for 30% of total combustion heat. Very high thermal power also causes the workpiece substrate to be strongly heated. This requires a strong cooling of the substrate. Or with a very high gun and the relative speed of the work.
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