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Application of titanium and titanium alloys in engine engines

Aero engine is the most important part of the whole aircraft, and it is the core to ensure the safe completion of the flight mission. Titanium alloy has been widely used in many parts of aero engine, the application of titanium alloy can further improve the thrust-weight ratio of aero engine and improve its economy. The application proportion of titanium alloy in aero engine is also an important indicator to measure the advanced degree of engine. The amount of titanium on foreign advanced engines is usually maintained at 20% ~ 35%. The turbojet 13 engine developed in 1978 and designed in early 1988 has a titanium content of 13%, and the Kunlun turbojet engine designed in 2002 is the first aero engine with fully independent intellectual property rights, and the titanium content has increased to 15%. Many parts such as blades, blades and casings in aero engines are made of titanium alloy The key components of titanium alloy that have been widely used and are under development include titanium alloy fan, titanium alloy monolithic blade disk, monolithic blade ring, continuous fiber reinforced titanium composite blade and titanium alloy casing. With the continuous improvement of the design and manufacturing level of the key components of titanium alloy, as well as the requirement of the thrust to weight ratio of aeroengines, the requirements of both the use of titanium alloy and its mechanical properties will become higher and higher. Under the background of the national "two-engine special project" to develop aero engines, the development of high temperature titanium alloy materials with high performance is the key to improve the performance of China's aero engines.



Application of titanium and titanium alloys in ships

In particular, it has excellent corrosion resistance in chloride atmospheres such as seawater and oceans. The application of titanium material on ships can reduce the maintenance cost and life cycle cost of ships, reduce the weight of the hull, increase the payload, improve the reliability and tactical of ships, and is an ideal material for the shipbuilding industry. The main applications of titanium and its alloys in the field of ships are: pressure shell, hull structure, pipeline, valve and so on Accessories, power drives, heat exchangers, coolers/condensers, sonar hoods, etc. Titanium alloy for ship industry began in the 1960s, the current United States, Russia, Japan, China Countries, the United Kingdom, France and Germany are widely used. Compared with foreign countries, our ship titanium alloy There is still a big gap in application: the application part is small, the amount is small, the titanium used in foreign countries reaches 13%, and China is only applied in some sporadic parts, the proportion is less than 1%. Varieties, specifications are not perfect, China's previous titanium production in professional chemical plants, limited by equipment capacity, the production of varieties, specifications are limited, "dragon" required titanium alloy can only be imported from Russia. Processing and manufacturing technology is also relatively backward. Related to titanium alloy material specifications are: castings, forgings, plates, bars, pipes, wire; The titanium alloy preparation processes involved are: casting process, forging process, welding process, cold forming process, hot forming process, heat treatment process, mechanical processing process, surface treatment process, dissimilar metal insulation treatment process. Compared with aviation materials, the product size and single weight of Marine materials are larger. China's previous titanium industry owners to serve the aviation industry, the use of professional chemical production, production equipment and capacity is limited, titanium products product size can not meet the needs of ships, many types of titanium manufacturers can not provide, such as wide and thick plates, large caliber seamless pipe, profiles, complex castings and so on. If the specialized production plant is fully equipped with the production equipment required for titanium materials for ships, it will greatly push up the cost of products, which is not conducive to the promotion and application of titanium and titanium alloys in the shipbuilding industry.



Advantages and applications of titanium anode plate

The advantages and applications of various titanium anode plates: ruthenium-titanium anode plate, ruthenium-iridium titanium anode plate, tantalum-iridium titanium anode plate, iridium-tin titanium anode plate. 1, ruthenium-titanium anode plate Product advantages: high current efficiency (chlorine or oxygen evolution environment), excellent corrosion resistance, long electrode life, electrode specifications and sizes can be designed according to user needs, electrode substrate can be reused many times, no pollution to the medium. Application fields: chlor-alkali industry, sodium hypochlorite industry, sewage treatment industry, fresh water disinfection 2, ruthenium-iridium titanium anode plate Advantages: The anode size is stable, the electrode spacing does not change during the electrolytic process, which can ensure that the electrolytic operation is carried out under the condition of stable tank voltage. Low working voltage, small power consumption, consumption can be reduced by about 20%. Titanium anodes have a long working life, and metal anodes are resistant to chlorine and alkali corrosion in the chlorine gas production industry by diaphragm method. It can overcome the problem of graphite anode and lead anode dissolution, avoid the pollution of electrolyte and cathode products, and improve the quality of products. Can improve the current density. For example, in the production of chlor-alkali by diaphragm method, the current density of graphite electrode is 8A/M2; The titanium anode can be multiplied to 17A/M2; In this way, in the case of the same electrolytic plant and electrolyzer, the output can be doubled. Strong corrosion resistance, can work in many corrosive, have special requirements of electrolytic media. The short-circuit problem after lead anode deformation can be avoided, thus improving current efficiency. Matrix titanium can be used repeatedly. Application fields: chlor-alkali industry, chlorine dioxide production, chlorate industry, hypochlorite industry, perchlorate production, hospital sewage treatment, persulfate production, food utensils disinfection, ionized water production 3. Titanium tantalum iridium anode plate Advantages: Metal is extracted by electrolysis in sulfuric acid solution, oxygen is precipitated on the anode, and selecting the appropriate anode material is a very important problem. Titanium electrode coated with tantalum series has low oxygen overpotential and is not corroded by electrolyte. Iridium oxide coatings show excellent electrolytic durability. The initial anode potential is 1.51V, and after 6000 hours, it is 1.64V, and the coating weight loss is 0mg/M2 The use of lead-based alloy electrodes in electrolytic production (containing Sb6% ~ 15%, or containing Ag1%), the lead anode will dissolve, consume the anode material, affect the life of the anode, and the lead dissolved in the solution will precipitate on the cathode to increase the lead impurities in the metal, reducing the quality of the product. Ruthenium coating will be seriously damaged under this condition, so it is not suitable for use. The initial anode potential was 1.48V, and 1000 hours later, it rose to 2.0V, and the anode had been passivated. Applications: electrolytic production of non-ferrous metals, disinfection of food utensils, electrolytic silver catalyst production, dyeing and finishing wastewater treatment of woolen mills, electrolysis manufacturing of copper foil, galvanized steel plate, chrome plating, electrolytic oxidation recovery of mercury, rhodium plating, palladium plating, gold plating, water electrolysis, salt melting electrolysis, battery production, cathode protection, ionized water production, printed circuit board, 4, iridium tin titanium anode plate Product advantages: high current efficiency (in chlorine or oxygen evolution environment), excellent corrosion resistance, long service life of the electrode, the size of the electrode can be designed according to user needs, the electrode substrate can be reused many times, no pollution to the medium. Application fields: chlor-alkali industry, aluminum foil, copper foil industry, industrial sewage treatment, ionized water production, organic electrochemical treatment and organic electrochemical synthesis, electrolytic purification treatment gas, seawater desalination, oxidant regeneration cycle.



Application of titanium alloy in space rocket

The development of high pulse thrust-weight ratio engines for advanced aerospace rocket technology products requires the use of titanium alloys with higher low temperature strength and plasticity. For this reason, the Metal Research Institute of the Russian "Composite Materials" joint-stock company is carrying out the process determination cycle of BT6c alloy for this project. This alloy is used to produce φ600mm die forgings with operating temperatures up to -200℃, plates for accumulators, bearing brackets and billets for pipe joints. At present, we are exploring ways to reduce the working temperature of the alloy to a 253'C, one of which is to obtain parts by particle metallurgy. This process can ensure that all parts of the billet have uniform fine crystal structure, and make the whole billet performance isotropic. Dense blank was prepared from BT6c alloy particles after hot isostatic pressing in α+β zone + one-stage roasting. The strength was 100MPa higher than that of BT5-1KT alloy, and the fatigue performance was higher. The most widely used titanium alloys in space rockets are two-phase alloys BT6c, BTl4, BT3-1, BT23, BTl6, BT9 (BT8), which are mainly used in heat treatment strengthening states. Annealing BT6c alloy can be used in accumulators, but the alloy is mostly used in the heat treatment strengthening state σb = 1050MPa - 1100MPa. Similar applications include BTl4 alloys σb = 1100MPa ~ 1150MPa. The annealed BTl4 alloy σb≥900MPa can be used as a tubular beam with a diameter of 80mm to 120mm, and is also used in the manufacture of fasteners operating at -196 ° C.