Application of aerospace titanium castings and Progress in research

Development needs of aero engine high performance led development leads the high temperature aerospace titanium castings, titanium alloy using the temperature gradually increased,from twentieth Century 50 to alloy as the representative, through to the alloy as the representative of the. At present, represents the international advanced high-temperature titanium alloy has USA, Britain, Russia and Chinese. Composition andperformance features of high temperature titanium alloy. Through research, the author thinks that the development direction of titanium alloy is mainly: (1) standardevaluation of fire retardant properties of aerospace titanium castings and method. Flame retardantperformance evaluation of titanium alloy right is one of the key techniques of flame retardant Titanium alloy sheet, including the simulation methods and detection technology of combustion ofaerospace titanium castings. At present, the flame retardant performanceevaluation method has no uniform standards, countries have adopted different methods to test. At present, the flame retardant performance evaluation method has no uniform standards, countries have adopted different methods to test. Flame retardant performance evaluation method of titanium alloy and therefore the formulation of a unified standard will effectively promote the national titanium alloyexchange. (2) increase the mechanical properties of titanium alloy plates. Compared with thetitanium alloy, titanium alloy is poor mechanical properties, low working temperature.Research on how to improve the mechanical properties of this alloy for deeper. (3)reduce the cost of titanium alloy. Titanium alloy containing large amount of noble metal elements of V, resulting in higher costs, limiting its application. The domesticscholars have studied to replace V with Mo part of low price.

The installation location, the role of the titanium check valve

The effect of the Titanium alloy valves in the pipeline is to prevent the backflow of fluid. Common use of more than a check valve in plumbing, exports more than installing the pump check valve, so that when the pump stops, the water pipeline will not turn the clock back; pump suction pipe head also has a check valve, so that it Sheung Shui can be maintained when the next start. Common spring-type check valve, lift and swing. Also used in the hydraulic check valve, the hydraulic system can maintain pressure. Titanium alloy sheet is usually installed in the export position of the pump. Titanium check valve, also known as check valves, determined according to the specific needs of the pipeline installation direction. If the installation location of the pipe is vertical, you can choose from spin type, pipeline. If the pipe is horizontal mounting position, you can choose the lift. Lift check valves open and close the fastest. Spin from the check valve of least resistance. Pipeline check valves are generally mounted on the clip-on approach in the majority, are not suitable for installation distance off place. titanium alloy sheets  widely used in various pump outlet pipe, extraction pipes, drains, and other media are not allowed back in the pipeline. Before the use of the titanium check valve is a pressure differential valve which automatically open and close the valve, it is the role of the medium flow in one direction only, and to prevent the reverse flow. According to their different structures, the check valve can be divided into lift (jump centripetal) and swing (roll plate) two. Lift check valve must be installed in horizontal pipelines, and make strict vertical axis of the valve in a horizontal plane, in order to ensure a flexible and reliable operation of the valve lift of. Swing check valve as long as the rotation pivot horizontally, can be installed in any horizontal, vertical or inclined pipeline.

Planning and application of titanium alloy valve

Industrial pure titanium titanium refers to non titanium alloys with different Fe, C, N, O and other impurities content. Industrial pure titanium can not be heat treatedstrengthening, molding excellent performance, easy welding and brazing. The practical application of industrial pure titanium widely, research found that a typicaldeformation of industrial pure titanium; typical casting pure titanium. Titanium alloywith titanium, alloy by adding Al, Sn, Cr, Mo and Mn elements. titanium alloy usually inannealing state phase classification, divided into alpha, beta and alpha + beta type titanium alloy. The main components of titanium alloy for alloy Ti with Al, Sn, Cr, alpha stable elements, the return of state organization for a solid solution. Titanium alloy can not be strengthened by heat treatment, its strength than the beta and alpha + betatype titanium alloy is low, but keep the high temperature strength and good in 500 ~ 600 ℃ when in use. The welding properties, casting properties, pressure processingperformance, stability and no cold brittle good with titanium alloy, disadvantage is thelow technology of plastic and the hydrogen embrittlement sensitivity. Titanium alloy sheet is widely used in practice, the typical alpha type deformation of titanium alloy. The maincomponents of beta type titanium alloy for alloy Ti with Cr, Mo, V and other elements,this kind of alloy after quenching process are beta crystallology organization, strength and impact toughness of high pressure processing performance, and good welding performance. But the performance of titanium alloy microstructure instability, melting process complex, less application. Stable beta titanium alloy. The microstructure ofalpha + beta type titanium alloy for α + β organization, is in the steady state with 5% ~ 25% beta and beta zone from rapid cooling forming alpha + beta titanium alloy phase alpha martensite, which can be strengthened by heat treatment quenching and aging treatmen.

Application and selection of titanium alloy valve

Titanium and titanium alloy of high strength, low density and other properties make it widely used in aerospace engineering. Such as various pipeline aircraft on the extensive use of titanium alloy valve, Titanium castingstype relates to the cut-off valve, check valve, needle valve, plug valve, ball valve and butterfly valve. Titanium valve as the key system components conveying fluid control titanium alloy pipe, widely used in chemical engineering. Valve valve with fasteners as important component, is also very important in valve design, manufacture. Implemented in a large PTA project mass production and application. Titanium valve is widely used in chemical industry, but must pay attention to its not suitable for any chemical medium. The hydrofluoric acid, hydrochloric acid, sulfuric acid and phosphoric acid and oxalic acid, formic acid, hot concentrated three chloroacetic acid, three trifluoroacetic acid and strong corrosive aluminum chloride, have severe corrosion effect of titanium plate and titanium alloy, titanium valve is not suitable for this kind of chemical medium, should pay attention to in use.