In recent years, with the rapid development of China's economy, the blossoming of various industries, valves as an essential general mechanical equipment, the market demand for products is increasing, China's valve industry has also been rapid development.
Valves are usually composed of valve body, valve cover, valve flap, valve stem, hot piece, packing and drive parts, valve body, valve cover materials selected for the main body materials, valve flap (gate), ball, valve seat, valve stem and sealing seat and other selected materials known as the internal materials, in addition to fasteners materials; valves are commonly selected materials such as grey cast iron, ductile iron, alloy steel and copper alloy, etc., selective diversification. But with the further needs of production, researchers found in some harsh working environment and complex special conditions, the conventional valve materials can not meet the production and scientific research needs. At this time, titanium and cast titanium alloy because of the superior performance has attracted people's attention, titanium valves have been a certain development.
Seawater piping system is located in a very harsh working environment, the performance of marine valves directly affect the safety of the piping system and even the overall performance. As early as the 1960s, Russia began the research of ship titanium alloy, and then developed a marine β titanium alloy, used in the subsequent military ship piping system, which involves titanium alloy valves such as globe valves, check valves and ball valves, etc., the use of a wide range of types, the number is huge; at the same time, the civil ship piping system has also begun to use titanium valves. Compared with the previous use of copper alloy, steel, etc., after the launching test also shows that the use of cast titanium alloy, its own structural strength and corrosion resistance and many other aspects of the high reliability, service life has been greatly extended from the original 2~5 years can be extended to more than 2 times, has attracted widespread attention.
Aerospace Titanium Valves
In aerospace, cast titanium alloys also have a good performance, thanks to their good heat resistance and strength. It was also during this period in the 1960s that titanium castings were first trialled by American Airlines. After a period of research, from 1972 cast titanium alloys began to be formally used in aircraft (Boeing 757, 767 and 777, etc.), not only used more static structure of titanium castings, but also began to be used in key positions, increasing safety and reliability, while due to titanium alloys relative to other alloys, density is small, the weight of the same strength of steel is only 60% or so, so it is widely used to promote the development of aircraft to high strength, so that it can be used in the same way. Widely used can promote the aircraft to the direction of high strength, lightweight and steady progress.
At present, aerospace valves are mainly used in many control systems such as pneumatic, hydraulic, fuel and lubrication, which are more suitable for corrosion-resistant and high ambient temperature environments, and they are one of the crucial departmental parts for space vehicles and engines. Traditional valves often need to be replaced in stages, or even unable to meet the demand, so the share of titanium valves due to its superior performance is also rising.
Titanium valves for the chemical industry
chemical valves are generally used in high temperature, high pressure, corrosion resistance and differential pressure and other generally harsh environments, so the appropriate choice of materials for the valve chemical industry applications appear to be critical, the early selection of materials are mostly carbon steel, stainless steel, etc., and the use of a period of time will be the phenomenon of corrosion will occur, need to be replaced and maintained. With the continuous development of casting titanium alloy technology and its superior performance gradually be found, titanium valves also appeared in people's eyes.
Casting titanium alloy in the valve market applications are not limited to the above industries, other aspects of the development of a good development, such as the Japanese development of a new casting titanium alloy Ti-33.5Al-1Nb-0.5Cr-0.5Si, has a low density, high creep strength and good abrasion resistance, and many other advantages, which will be used in the automotive engine after the exhaust valves, you can improve the safety performance of the engine The use of titanium alloy in the rear exhaust valve of automobile engine can improve the safety performance of the engine and prolong its service life.
Cast titanium alloys in other industries
Compared with the cast titanium alloys in the valve industry, the cast titanium alloys of other applications are more extensive. Titanium and titanium alloys have good corrosion resistance, so for petrochemical and other corrosive requirements of the industry is important. Medical field, because titanium is the world's recognised safe and non-toxic, no heavy metal precipitation of the safety of the metal, so a lot of medical aids, human prostheses and so on are cast titanium alloys as a material, especially in the dental medical, almost all the tried and tested dental medical castings are made of industrial pure titanium and Ti-6Al-4V alloy, with good biocompatibility, mechanical properties and corrosion resistance. The castings have good biocompatibility, mechanical properties and corrosion resistance.
On the other hand, due to the advantages of titanium and titanium alloys such as low density and good performance, they are widely used in golf clubs, heads, tennis rackets, badminton rackets and fishing tackle, and many other sports equipment, with which the products made of light weight, quality assurance, and are very popular among the public.
From the end of the 20th century, casting titanium alloy in the petrochemical industry, aerospace, biomedical, automotive industry and sports and leisure and other fields has been from the initial initial exploration to the current promotion of the development of the best efforts, and gradually formed industrialisation and scale.
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