As we all know, cemented carbide is an alloy material made of hard compounds of refractory metals such as tungsten carbide (WC) powder and bonding metals such as cobalt (Co) powder through powder metallurgy process/injection molding technology/3D printing process, It has the characteristics of high hardness, good toughness, wear resistance, heat resistance and corrosion resistance, and is widely used in cutting tools, metal molds, aerospace parts and other fields. However, the physical and chemical properties of cemented carbide are not static and are mainly affected by the content of WC powder, WC grain and Co content.
Generally, as the content of WC powder increases, the hardness of the cemented carbide increases, the wear resistance becomes better, but the toughness becomes worse; as the WC grain decreases, the hardness of the alloy increases, and vice versa; The higher the cobalt content, the better the toughness of the alloy and the lower the hardness, otherwise the worse the toughness and the higher the hardness.
Studies have shown that when the Co content is 6% and the average grain size of WC is 0.8μm, the density of cemented carbide is 14.85-14.95g/cm3, the bending strength is greater than or equal to 3000MPa, and the hardness is 92.6HRA (±0.5), suitable for Used in the manufacture and processing of non-metallic and non-ferrous metal tools.
When the Co content is 6% and the average grain size of WC is 0.4μm, the density of cemented carbide is 14.5-14.7g/cm3, the bending strength is greater than or equal to 3500MPa, and the hardness is 94HRA (±0.5), which is suitable for powder metallurgy Processing and can be made into PCB (printed circuit board).
When the Co content is 8% and the average grain size of WC is 0.5μm, the density of cemented carbide is 14.4-14.6g/cm3, the bending strength is greater than or equal to 3600MPa, and the hardness is 93.3HRA (±0.5), which is suitable for hard ends Milling and fine milling, processing fiber, wood, plastic, brass, aluminum alloy, etc., can make PCB micro-drills and engraving knives.
When the Co content is 10% and the average grain size of WC is 0.8μm, the density of cemented carbide is 14.35-14.5g/cm3, the bending strength is greater than or equal to 4000MPa, and the hardness is 91.7HRA (±0.5), suitable for processing cast iron, The first choice for aluminum alloy and various non-metallic materials; it is suitable for processing materials with a hardness lower than HRC55, and has good versatility.
When the Co content is 10% and the average grain size of WC is 1.0μm, the density of cemented carbide is 14.4-14.55g/cm3, the bending strength is greater than or equal to 3800MPa, and the hardness is 91.2HRA (±0.5), which can be used for ordinary end milling , Rough milling, suitable for HRC30-45 material processing.
When the Co content is 12% and the average grain size of WC is 0.4μm, the density of cemented carbide is 13.95-14.25g/cm3, the bending strength is greater than or equal to 4000MPa, and the hardness is 92.5HRA (±0.5), suitable for processing gray cast iron , titanium alloy, heat-resistant materials, stainless steel, hardened steel, glass fiber reinforced plastics and composite materials, suitable for high-speed processing.
When the Co content is 9% and the average grain size of WC is 0.2μm, the density of cemented carbide is 14.2-14.4g/cm3, the bending strength is greater than or equal to 4000MPa, and the hardness is 93.7HRA (±0.5), which is suitable for processing high Strength, high wear resistance material.
When the Co content is 7% and the average grain size of WC is 0.5μm, the density of the cemented carbide is 14.4-14.7g/cm3, the bending strength is greater than or equal to 3600MPa, and the hardness is 93.3HRA (±0.5), which is suitable for the rigidity of the machine tool. Good finishing, can be made into reamer, deep hole drill and PCB (printed circuit board).
When the Co content is 5% and the average grain size of WC is 0.4μm, the density of cemented carbide is 14.5-14.8g/cm3, the bending strength is greater than or equal to 3500MPa, and the hardness is 94HRA (±0.5), which has excellent wear resistance Sex, can be made into PCB. Get more details for carbide blanks here.
When the Co content is 10% and the average grain size of WC is 0.5μm, the density of cemented carbide is 14.15-14.3g/cm3, the bending strength is greater than or equal to 4000MPa, the hardness is 93.0HRA (±0.5), and the machinable hardness is in Materials between 45-65HRC can be used for milling high-temperature resistant steel, hardened steel, gray cast iron, heat-resistant alloy, titanium alloy, etc., suitable for high-speed processing.
When the Co content is 10% and the average grain size of WC is 0.6μm, the density of cemented carbide is 14.4-14.55g/cm3, the bending strength is greater than or equal to 3800MPa, and the hardness is 92.1HRA (±0.5), which is suitable for the rigidity of machine tools Better, processing stainless steel, aluminum alloy, gray cast iron, titanium alloy and glass steel.
