What are the fields of nano WC Cemented Carbides applied?
(4) medical application. The drill is a fine medical instrument, the incision must be sharp, but also has good abrasion resistance and toughness, application of ultrafine grain WC hard alloy with high strength, high toughness and wear resistance in this field widely. (5) other applications. Nanocrystalline WC hard alloy because of its fine grain, as the cutting tool can grind the cutting edge radius and high precision, sharp nose arc; because of its high strength can be used for making fine tool rake angle, feed rate and small amount of snacks knife, such as small diameter cutter, reamer etc. because of its high elasticity; modulus and friction wear properties, can be used for the production of high precision mould, punch etc.; also can be used for the production of high wear resistance, erosion resistance, such as high-pressure nozzle, valve, high-pressure gun, glass cutter, cutter and textile tape, tape cutter etc.. In addition, scientists are developing circular tools, rock drilling tools and nano WC-Co based reinforced composites. Therefore, the development of nano WC cemented carbide and the search for wider applications become the focus of development, and the key technology of preparation is the preparation of nano powder and the subsequent sintering process. Particle size is to improve the performance of WC-Co hard alloy (strength, hardness and wear resistance of the Jun effective way, therefore the development of nano cemented carbide is the development focus of the next phase of the study, it will greatly broaden the application field of WC-Co hard alloy, and thus lead to a variety of precision instruments, mold, tool and electronic communication technology rapid development.
(3) wood processing. As early as 50s, carbide tipped tools were used in the wood processing industry. Now, there sheet of all kinds of materials, the processing precision and the requirements of the appearance is greatly improved, the centrifugal force, when high speed cutting cutting force so that ordinary hard alloy is difficult to meet the requirements of the processing, and nanocrystalline WC cemented carbide has been useless.
(2) electronic industry. The development trend of electronic products is miniaturization, integration and precision. The integrated circuit board is made of epoxy resin, glass fiber or glass fiber reinforced plastic. This requires micro drill has high hardness and wear resistance; while the drill diameter is very small (generally 0.2 ~ 0.3mm, and 0.05mm), easy to break, also called bit has high strength and toughness, and need to correct drilling hole position accuracy, and the drill bit has high stiffness (elastic modulus). These conflicting requirements. The common hard alloy and fine grain carbide drills are difficult to meet these requirements, only the use of nano grain carbide grain size of less than 0.5 m. And as the dot printing needle, its diameter is only 0.2-0.35mm; multi frame processing integrated circuit lead by the progressive die, punch thickness less than 0.2mm, the error is only 0.002mm; in addition to the printed circuit board with wire cutting head disc cutter, and the precision of the small die, all require the use of Nanocrystalline WC cemented carbide in order to achieve its function to produce alloy.
Nano WC-Co hard alloy, because of its special wear resistance, high hardness, and fracture toughness and excellent compressive strength have been widely applied in various fields of modern technology, has been made of integrated circuit board micro drill, dot matrix printer print needle, hole processing tools, woodworking tools, precision mould, drill, hard processing materials tool etc.. The main applications are summarized as follows: (1) metal working. At first, the development of sub micron WC hard alloy is to solve the high temperature alloy hard to machining processing materials, modern nano WC hard alloy is superior in strength and toughness of sub micro alloy, and therefore more suitable for high temperature alloy, titanium alloy, stainless steel, spraying (welding) processing materials, quenching steel, chilled cast iron etc.. The nano WC cemented carbide breaks through the limit of the bending strength of ordinary cemented carbide, which is far lower than that of high speed steel. Its application has been extended to the field of high speed steel.
