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Titanium Aluminide
Titanium aluminide (chemical formula TiAl), commonly gamma titanium, is an intermetallic chemical compound. It is lightweight and resistant to oxidation and heat, but has low ductility. The density of γ-TiAl is about 4.0 g/cm3. It finds use in several applications including aircraft, jet engines, sporting equipment and automobiles. The development of TiAl based alloys began circa 1970. The alloys have been used in these applications only since about 2000. Titanium aluminide has three major intermetallic compounds: gamma titanium aluminide (gamma TiAl, γ-TiAl), alpha 2-Ti3Al and TiAl3. Among the three, gamma TiAl has received the most interest and applications. Applications of gamma-TiAl Gamma TiAl has excellent mechanical properties and oxidation and corrosion resistance at elevated temperatures (over 600°C), which makes it a possible replacement for traditional Ni based superalloy components in aircraft turbine engines. TiAl-based alloys have potential to increase the thru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intermetallics
An intermetallic (also called intermetallic compound, intermetallic alloy, ordered intermetallic alloy, long-range-ordered alloy) is a type of metallic alloy that forms an ordered solid-state compound between two or more metallic elements. Intermetallics are generally hard and brittle, with good high-temperature mechanical properties. They can be classified as stoichiometric or nonstoichiometic. The term "intermetallic compounds" applied to solid phases has long been in use. However, Hume-Rothery argued that it misleads, suggesting a fixed stoichiometry and a clear decomposition into species. Definitions Research definition In 1967 defined intermetallic compounds as ''solid phases containing two or more metallic elements, with optionally one or more non-metallic elements, whose crystal structure differs from that of the other constituents''. This definition includes: * Electron (or Hume-Rothery) compounds * Size packing phases. e.g. Laves phases, Frank–Kasper phases and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boeing 747-8
The Boeing 747-8 is the final series of the large, long-range wide-body airliners in the Boeing 747 family from Boeing Commercial Airplanes. It is the largest model variant of the 747 and Boeing's largest aircraft overall. Following the introduction of the 747-400, Boeing explored larger 747 versions as potential competitors to the proposed double-deck Airbus A3XX, later developed as the Airbus A380. The stretched aircraft, initially called the ''747 Advanced'' was officially launched as the 747-8 on November 14, 2005, with the designation reflecting its technological ties to the 787 Dreamliner. At the time, Boeing forecasted a market of 300 aircraft. The 747-8's maiden flight was made by the freighter version, the 747-8F, on February 8, 2010, followed by the passenger version, the 747-8I Intercontinental, on March 20, 2011. The freighter version was delivered in October 2011, and the passenger variant entered commercial service in June 2012. The aircraft's fuselage was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wired (magazine)
''Wired'' is a bi-monthly American magazine that focuses on how emerging technologies affect culture, the economy, and politics. It is published in both print and Online magazine, online editions by Condé Nast. The magazine has been in publication since its launch in January 1993. Its editorial office is based in San Francisco, California, with its business headquarters located in New York City. ''Wired'' quickly became recognized as the voice of the emerging digital economy and culture and a pace setter in print design and web design. From 1998 until 2006, the magazine and its website, ''Wired.com'', experienced separate ownership before being fully consolidated under Condé Nast in 2006. It has won multiple National Magazine Awards and has been credited with shaping discourse around the digital revolution. The magazine also coined the term Crowdsourcing, ''crowdsourcing'', as well as its annual tradition of handing out Vaporware Awards. ''Wired'' has launched several in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Complication (horology)
In horology, a complication is any feature of a timepiece beyond the display of hours, minutes and seconds. A timepiece indicating only hours, minutes and seconds is known as a simple movement. Common complications include date or day-of-the-week indicators, alarms, chronographs (stopwatches), and automatic winding mechanisms. Complications may be found in any clock, but they are most notable in mechanical watches where the small size makes them difficult to design and assemble. A typical date-display chronograph may have up to 250 parts, while a particularly complex watch may have a thousand or more parts. Watches with several complications are referred to as ''grandes complications.'' Types Timing * Chronograph, with a second hand that can be stopped and started to function as a stopwatch. ** Double chronograph or ''rattrapante'', multiple second hands for split-second, lap timing or timing multiple events ** Flyback chronograph, allowing rapid reset of the chronogr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Omega Seamaster
The Omega Seamaster is a line of automatic winding mechanical diving watches from Omega with a history that can be traced back to the original water-resistant dress-style watch released in 1948. The Seamaster collection is perhaps best known today for the Seamaster Diver Professional 300m model that has been worn in the James Bond movie franchise since 1995. Originally conceived as a dressy, water-resistant timepiece, the Omega Seamaster has evolved to a robust sports watch line, typically with a stainless steel case, robust water resistance, and an official chronometer-certified movement within. The Diver Professional 300m is most famous for its "train-track" five link steel bracelet, its helium release valve at the 10:00 position, the wave pattern dial on certain model generations, and the skeletonized handset. The current model range is split into separate lines of Seamaster models: the Aqua Terra line serves as the everyday sports watch model, the Diver Professional 300m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Additive Manufacturing
3D printing, or additive manufacturing, is the construction of a three-dimensional object from a CAD model or a digital 3D model. It can be done in a variety of processes in which material is deposited, joined or solidified under computer control, with the material being added together (such as plastics, liquids or powder grains being fused), typically layer by layer. In the 1980s, 3D printing techniques were considered suitable only for the production of functional or aesthetic prototypes, and a more appropriate term for it at the time was rapid prototyping. , the precision, repeatability, and material range of 3D printing have increased to the point that some 3D printing processes are considered viable as an industrial-production technology; in this context, the term ''additive manufacturing'' can be used synonymously with ''3D printing''. One of the key advantages of 3D printing is the ability to produce very complex shapes or geometries that would be otherwise infeasibl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Avio
Avio S.p.A. is an Italian company operating in the aerospace sector with its head office in Colleferro near Rome, Italy. Founded in 1908, it is present in Italy and abroad with different commercial offices and 10 production sites. Avio operates in: *solid-propellant motors for space and tactical propulsion *electronic/electrical control and automation systems Avio is Prime Contractor for the new European launcher Vega and sub-contractor for the Ariane program, both financed by the European Space Agency (ESA). The company is active in the field of technological research. It carries out projects in collaboration with 14 Italian and 10 foreign universities and research centres, which are aimed at the continuous improvement of product and process technologies. It also undertakes the research of solutions in order to reduce the environmental impact of aircraft engines, in conformity with the objectives of consumption and emissions reduction dictated, within the European area, by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Precision Castparts Corp
Precision Castparts Corp. is an American industrial goods and metal fabrication company that manufactures investment castings, forged components, and airfoil castings for use in the aerospace, industrial gas turbine, and defense industries. In 2009 it ranked 362nd on the Fortune 500 list, and 11th in the aerospace and defense industry.Precision Castparts. Fortune 500: 2009. CNNMoney.com. Retrieved on April 20, 2009. In 2015 it ranked 322nd overall and 9th in the aerospace and defense industry. In 2014 it ranked 133rd on the S&P 500 based on market capitalization. In January 2016, the company became a wholly owned of |
Materials At High Temperatures
A material is a substance or mixture of substances that constitutes an object. Materials can be pure or impure, living or non-living matter. Materials can be classified on the basis of their physical and chemical properties, or on their geological origin or biological function. Materials science is the study of materials, their properties and their applications. Raw materials can be processed in different ways to influence their properties, by purification, shaping or the introduction of other materials. New materials can be produced from raw materials by synthesis. In industry, materials are inputs to manufacturing processes to produce products or more complex materials, and the nature and quantity of materials used may form part of the calculation for the cost of a product or delivery under contract, such as where contract costs are calculated on a " time and materials" basis. Historical elements Materials chart the history of humanity. The system of the three prehistoric a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boeing 787
The Boeing 787 Dreamliner is an American wide-body airliner developed and manufactured by Boeing Commercial Airplanes. After dropping its unconventional Sonic Cruiser project, Boeing announced the conventional 7E7 on January 29, 2003, which focused largely on efficiency. The program was launched on April 26, 2004, with an order for 50 aircraft from All Nippon Airways (ANA), targeting a 2008 introduction. On July 8, 2007, a prototype 787 without major operating systems was rolled out; subsequently the aircraft experienced multiple delays, until its maiden flight on December 15, 2009. Type certification was received in August 2011, and the first 787-8 was delivered in September 2011 and entered commercial service on October 26, 2011, with ANA. At launch, Boeing targeted the 787 with 20% less fuel burn compared to aircraft like the Boeing 767. It could carry 200 to 300 passengers on point-to-point routes up to , a shift from hub-and-spoke travel. The twinjet is powere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemical Compound
A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds. A molecule consisting of atoms of only one element is therefore not a compound. A compound can be transformed into a different substance by a chemical reaction, which may involve interactions with other substances. In this process, bonds between atoms may be broken or new bonds formed or both. There are four major types of compounds, distinguished by how the constituent atoms are bonded together. Molecular compounds are held together by covalent bonds; ionic compounds are held together by ionic bonds; intermetallic compounds are held together by metallic bonds; coordination complexes are held together by coordinate covalent bonds. Non-stoichiometric compounds form a disputed marginal case. A chemical formula specifies the number of atoms of each element in a compound molecule, usin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
