Tungsten Carbide Button Three Development Trends

Due to the higher hardness, strength and excellent wear and corrosion resistance, tungsten carbide button has been widely used in rock drilling, oil-field drilling and tunnel drilling. However, with the conditions has become more complex, tungsten carbide button own properties were difficult to meet the requirements now. So the relevant researchers have studies deeply, such as gradient structure, non-uniform structure and add trace elements.

1. Gradient structure: Gradient tungsten carbide is also called multi-phase and multi-structure alloy, which has high toughness and high wear resistance. Its principle is that uses low-carbon alloy and obtainedη-phase alloy by vacuum sintering, treated in a carburizing atmosphere thereby changing the distribution of the binder phase, so that different parts of the distribution of different alloy binder phase content improved. The experiment shows that compared with common tungsten carbide drills, tungsten carbide button bits with gradient structure has longer service (40%-60%) and the wear resistance improved 40%-90%.

2. Non-uniform structure: Non-uniform structure carbide can be main divided into two types, one is mixture with fine grains and coarse grains of WC, the other is high-Cobalt and low-cobalt alloy were separately granulated and then mixed with each other inhomogeneous structure of the alloy obtained. This kind of carbide button has good toughness and excellent wear resistance, but it still in the research and development stage.

3. Add trance elements: According to different conditions, such as some special requirements for the hardness, the wear and corrosion resistance, we can add some trace elements correspondly. There are two adding methods: one is added directly in solid form, take TaC and TiC as example, add Ta, Ti, W, C directly; the other is add TaC and TiC in elemental form. Adding small amount of TiC and TaC is beneficial for improving the binder phase composition and microstructure of the grain boundary, so as to effectively improve the wear resistance, impact toughness and resistance thermoplastic change capability. The effect of two ways is basically the same.

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