Advantages and Development of Thermal Spraying Technology
Overview Thermal spraying is a repair and pre-protection technology, with the development and improvement of modern technology, industrial production equipment and mechanical components of the performance requirements are getting higher and higher. The whole casting or forging more expensive metals, such as titanium, nickel, cobalt, tungsten, zirconium, and so on, and the casting, forging and welding methods have some difficulties, so in the ordinary material of the work surface, spray a layer of special coating Layer, to achieve: anti-corrosion, wear, wear, anti-high temperature, anti-oxidation, insulation, insulation, conductive, anti-microwave radiation and a series of various functions, to achieve energy conservation, energy conservation purposes.
The definition of thermal spraying refers to the use of oxygen - acetylene flame, arc, plasma arc, explosion waves to provide different heat source of the spraying device, resulting in high temperature and high pressure flame or supersonic flame flow, will be made of coating materials such as various metals, ceramics , Metal-ceramic composite materials, solid-state spray materials of various plastic powders, instantaneous heating to plastic or molten state, high-speed spraying to the surface of the pre-treated (clean rough) surface coating surface processing methods. We put a special work surface called "coating", the manufacturing method of coating called "thermal spray", it is a variety of heat source for spraying and spray welding in general.
Historical hot coating technology was first discovered in 1910 by Dr. Pu, was named: "metal spray"
In 1943 the United States METCO company published the first "metal sputtering" manual
In 1959 the United States METCO company seventh published renamed "flame spray" manual
September 7-14, 1973 held in London, the seventh session of the International Conference on thermal spraying, renamed "metal spray"
September 1979 - October 1 in the United States,Florida, a well-known retreat to Miami City held the eighth session of the international thermal spraying conference, on the use of "thermal spraying", the term, this is the "hot spray" noun origin.
China's thermal spraying technology is from the fifties began, when Wu Jianchun and Zhang Guobao in Shanghai set up the first domestic specialized spraying plant, the development of oxygen acetylene flame spray and spray device, and carry out metal spraying business. China's thermal spraying technology started earlier, 50 years on the development of the wire arc spraying; 60 years, some military departments began to study plasma spraying, plasma arc flame temperature is high, similar to the spraying particles flying fast, coating bonding strength High (40 ~ 80MPa), porosity less than 5%, widely used in China's military sector; 70 years appeared in the variety and model more complete spraying equipment and materials, but in general progress is slow, but only in recent years Get a faster development. In particular, the former State Economic Commission will be thermal spraying as a national key promotional projects, the development of faster and achieved significant economic benefits. October 21-21, 1981 by the State Economic Commission, the State Science and Technology Commission in Beijing held the first national thermal spraying conference, announced by the State Economic Commission under the leadership of the establishment of the "National Thermal Spray Collaborative Group", anchored in Beijing Mining and Metallurgy Research Institutions, and cooperation groups on the contact with the State Economic and Trade Commission, the next contact with the provinces and municipalities, autonomous regions Economic and Trade Commission of the Ministry of Science and Technology Bureau, as well as large and medium-sized enterprises, universities, research institutes and other cross-regional, cross-sectoral, Spraying technology network system, the existing group member units more than 400. In 1991,the Wuhan Institute of Materials Protection of the State Ministry of Mechanical and Electrical Engineering applied to the Ministry of Civil Affairs for the establishment of the "China Surface Engineering Association Thermal Spraying Professional Committee", is the country engaged in surface engineering enterprises and related units of the voluntary organization of the industry, is now affiliated to Beijing Agricultural College, Has more than 400 members of the development group and more than 150 overseas members.