High speed flame spraying equipment is generally composed of spray gun, powder feeder, control system, spray gun cooling system and gas supply system. At present, most of the high-speed flame spraying equipment in use in China are imported, and the most commonly used models are: DJ-2700 of Metco company and JP-5000 of Praxair company.
JP-5000 was successfully developed by the original Hobart TAFA company, and then the company was incorporated into Praxair company. These two kinds of equipment are most widely used in foreign countries, representing the development level of high-speed flame spraying technology in the world.
(1) Praxair JP-5000. The equipment uses kerosene as fuel, which is characterized by high combustion chamber pressure (> 10bar), high power and high flame exit velocity (2100m / s); The powder is injected radially from the low pressure area of the burner to make the powder heated evenly and fully. Compared with other processes, the powder size suitable for spraying is coarser, which is helpful to reduce the cost. So far, the performance of WC Co coating sprayed by JP-5000 is slightly better than that of other HVOF methods, but the consumption of oxygen and kerosene is amazing.
（2）Metco DJ-2700. The equipment is produced by Metco company, using propane or propylene as fuel gas, and propane is mostly used as fuel gas in China. The equipment can be divided into two types: automatic control type and automatic control type. The manual type is only composed of spray gun, powder feeder and flow controller. It has good mobility and can be used in field spraying production. Compared with JP-5000, DJ-2700 has the advantages of simple configuration, convenient operation and low oxygen gas consumption.
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