As a modern industrial tooth, the quality control of cemented carbide is the main production issue. Any production process must be rigorous and pragmatic. The composition and structure of cemented carbide directly affect the performance relationship.
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The performance of cemented carbide is affected by the composition and structure of the hard phase and the bonding phase. Generally speaking, when the hard phase content is higher and the crystal grains are finer, the alloy has high hardness, good wear resistance, and poor impact resistance. When the alloy lacks carbon, the η phase (decarburization phase) appears, and the alloy performance becomes brittle. When the content of titanium carbide or tantalum carbide is higher, the red hardness of the alloy is improved, the anti-crescent wear ability is enhanced, and the cutting performance of cemented carbide inserts better.
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The composition and structure of the bonding phase also have an important impact on the properties of cemented carbide. In the production of cemented carbide, Co is a good bonding metal. Compared with Ni and Fe, Co has better wettability with the cemented carbide, and the performance of the cemented carbide is usually higher than that of Ni and Fe. Because Ni has low magnetic properties and good corrosion resistance, WC-Ni, as a non-magnetic alloy or corrosion-resistant alloy, is superior in performance to WC-Co alloy.
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Carbon and iron form stable Fe3C, which hinders the bonding and sintering of cemented carbide. In addition, iron is easy to form brittle ternary compounds with carbides, which increases the brittleness of the alloy. Although the hardness of iron-bonded cemented carbide is not low, the strength is far from that of cobalt-bonded alloys.
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In order to strengthen the bonding phase and improve the performance of cemented carbide, new bonding phases with different compositions and structures have been developed. W and C are used to alloy Co to produce a cobalt alloy with eutectic composition. The theoretical eutectic temperature is 1280 ℃ and the melting point is low, which is conducive to the densification of the sintered billet at low temperature.
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Improved the red hardness and creep resistance of cemented carbide by adjusting the composition of the bonding phase, and achieved good results. If Co-Ni-Cr-Mo-Al high temperature alloy is used to replace the traditional Co bonding phase, the cemented carbide insert blade has a longer service life and better cutting deformation resistance than the Co bonding phase.
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