Recently, China has accelerated the pace of development and production of equipment, has formed a complete development and production system, has more than 20 units engaged in thermal spraying equipment development and production, to produce various types of oxyacetylene flame spraying equipment, spray melting equipment; New arc spraying equipment; complete sets of plasma spraying equipment, spray welding equipment; all kinds of special machine tools; thermal spraying air purification equipment, pre-treatment and processing equipment. Stand-alone varieties have reached more than 100, these products development and production, to ensure the development of thermal spraying technology, more prominent are:
High-speed flame spraying device:
At present, the high-speed flame spraying device (hvof), (hvaf) and supersonic plasma spraying equipment introduced from abroad are characterized by high flying speed of the particles, high bonding strength with the substrate, low porosity, , Metallurgy, chemical and power industries play an important role. However, the imported equipment is expensive, and fuel (propane, propylene) is not easy to popularize, for the above situation, combined with China’s national conditions, Sichuan Great Wall Spray Technology Research Institute successfully developed oxygen acetylene flame as a high-speed spray gun. Due to the limit of acetylene pressure, although the particle flying speed of less than supersonic, but than conventional oxyacetylene flame powder spraying speed increased by 4 to 5 times, than atmospheric pressure plasma coating also increased by 1 to 2 times Spray metal and alloy powder materials are Al2O3-TiO2-CO-WC and polyethylene, nylon and other thermoplastic powder material. In addition, Xi’an Jiaotong University and other units have developed a successful high-speed flame (hvof) spraying device, and began to apply.
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