高纯致密钼制取
High-purity dense molybdenum production
Molybdenum has been used as a strengthening agent in steel, cast iron, and superalloys for many years. Its use has been essential to the production of engines and other automobile parts, railway lines and gears, shipbuilding, chemical processes, turbine blades and electrical contacts. In addition, the emergence of specialized refractory alloys containing molybdenum has enabled it to be used in many other applications, from automotive and aviation applications to electrical and thermal applications, from furnace linings to ultra-high temperature vacuum furnaces.
High-purity dense molybdenum can be produced using various methods, including reduction with hydrogen, carbon vapor deposition, high-temperature thermal decomposition, chemical vapor deposition, and physical vapor deposition. Each method can produce molybdenum with different characteristics, such as different purity levels, grain sizes, and surface conditions. Depending on the particular characteristics desired, different production processes may be suitable.
Reduction with hydrogen is one of the oldest processes used in producing high-purity dense molybdenum. This process involves passing hydrogen gas over molybdenum oxide, resulting in the reduction of the oxide to metal. This process has the advantage of offering a higher level of purity, with very few impurities present, while it tends to offer limited control over grain size.
Carbon vapor deposition is a newer method of producing high-purity dense molybdenum, which involves the vaporization of carbon and deposition onto molybdenum substrates, resulting in the formation of molybdenum. Decomposition of molybdenum oxide, whereby an electric arc exposes the substrate to high temperatures and oxygen, is another method of producing molybdenum. Chemical vapor deposition is similar, except that it utilizes a chemical reaction between volatile compounds to deposit molybdenum on the substrate.
Physical vapor deposition is a third method of producing high-purity dense molybdenum. This process exposes the substrate to a reactive gas stream and high temperatures, resulting in the formation of molybdenum on the substrate. In addition to offering high levels of purity, physical vapor deposition also provides greater control over grain size and surface conditions.
High-purity dense molybdenum production is a complex task, and requires the manufacturer to consider a variety of factors. Key considerations include process choice, purity level, grain size, and surface condition, all of which will influence the final product. Ultimately, the process chosen by the manufacturer will be based on the characteristics desired for the end product.
