The composition and composition of cemented carbide have a significant impact on its properties. Here are some of the main influencing factors:
1. Hard phase and bonding phase components: The hard phase of cemented carbide is usually composed of refractory carbides such as tungsten carbide and titanium carbide, while the bonding phase is usually composed of metal cobalt, nickel, etc. When the content of the hard phase is high and the grains are fine, the alloy has high hardness and good wear resistance, but poor impact resistance. If there is a lack of carbon in the alloy, a decarburization phase will occur, causing the alloy to become brittle. When the content of titanium carbide or tantalum carbide is high, the red hardness of the alloy increases and the crater wear resistance is enhanced, but the impact resistance is reduced.
2. The composition and structure of the bonding phase: The composition and structure of the bonding phase also have an important impact on the performance of cemented carbide. In the production of cemented carbide, cobalt is a good bonding metal. Compared with nickel and iron, cobalt has better wettability with the hard phase. The properties of the bonded cemented carbide are usually better than those of nickel and Fe. height of. Nickel has low magnetism and good corrosion resistance, making WC-Ni, as a non-magnetic alloy or corrosion-resistant alloy, superior to WC-Co alloy in performance.
3. Impurities and contamination: Impurities and contaminants in cemented carbide may affect its performance. For example, although the hardness of iron-bonded cemented carbide is not low, its strength is far different from that of cobalt-bonded alloys. The reason is that iron and carbides form brittle ternary compounds, which increases the brittleness of the alloy.
In summary, in order to optimize the performance of cemented carbide, its ingredients and composition need to be carefully selected and adjusted, while various parameters in the material preparation and manufacturing processes must be strictly controlled.
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