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As a typical representative of refractory metal carbides, spherical tungsten carbide powder is suitable for 3D printing and can produce higher quality cemented carbide products.
3D printing, also known as additive manufacturing, is the latest rapid prototyping device using technologies such as light curing and paper lamination. The biggest difference from ordinary printers is that the printing material can be liquid or solid powder. With the development of science and technology and the needs of popularization and application, the use of rapid direct prototyping to manufacture metal functional parts has become the main development direction of rapid prototyping.
Compared with traditional production methods, additive manufacturing technology has the characteristics of shorter production cycle, higher product precision, and individualization. In addition to being suitable for the manufacture of rapid prototyping small batch non-standard parts and heterogeneous material assemblies, metal 3D printing is also suitable for forming traditionally difficult parts, such as carbide tools, molds, structural parts, geological mining tools, etc.
Cemented carbide is an alloy material produced by powder metallurgy with tungsten carbide as the hard phase and cobalt, nickel, iron, copper and other metal elements as the bonding phase. It has high melting point, high strength, high hardness, good Red hardness, wear resistance, high temperature resistance and other characteristics, so it is widely used in extreme environments such as high temperature, high pressure, and high impact. However, alloys have very poor machinability due to their high hardness and high melting point.
The researchers used 3D printing technology to manufacture cemented carbide, which can effectively solve the problems of fracture, expansion and deformation of products made by traditional production methods. However, additive manufacturing technology has high requirements on the comprehensive performance of raw materials, and spherical tungsten carbide powder must be used, because it has the advantages of smooth surface, uniform particle size distribution, and high fluidity, which is the premise of smooth powder feeding and uniform powder distribution for 3D printers.
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The coronavirus (COVID-19) pandemic not only had a significant impact on public health, it also severely affected one of the linchpins of the global economy – the tourism industry. As many countries introduced curfews and travel restrictions to contain the spread of the virus, travel across the world significantly declined from early 2020 onwards. The financial repercussions of the coronavirus have already begun to manifest themselves within the tourism industry. In 2020, global revenue from the travel and tourism industry was estimated to drop from a forecasted 711.94 billion U.S. dollars to 568.6 billion U.S. dollars, representing a decrease of over 20 percent. The region predicted to see the highest decline in revenue was Europe, decreasing from 211.97 billion U.S. dollars in 2019 to roughly 124 billion U.S. dollars in 2020.
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