Polycrystalline tungsten carbides

Cemented tungsten carbides also find use as a support for polycrystalline diamond (PCD) cutting tips, or as a matrix alloy with cobalt, nickel, copper, and iron, ia which diamond particles are embedded. These tools are employed ia a variety of iadustries including mineral exploration and development oil and gas exploration and production and concrete, asphalt, and dimension stone cutting. 

Figure 4-150 shows the major components and design of the PDC bit. The polycrystalline diamond compacts, shown in Figure 4-151. The polycrystalline diamond compacts (of which General Electric s) consist of a thin layer of synthetic diamonds on a tungsten carbide disk. These compacts are produced as an integral blank by a high-pressure, high-temperature process. The diamond layer consists of many tiny crystals grown together at random orientations for maximum strength and wear resistance.

Table 2.4 Activity of methanol decomposition on polycrystalline surfaces of metals, tungsten carbides, and metal-modified tungsten carbides...

Common tool materials for machining aluminum and magnesium alloys are cemented carbide and polycrystalline diamond (PCD). Because of the strong affinity between aluminum and titanium, only tungsten-based cemented carbide tools are used for alloys with relevant aluminum contents. 

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