Compared with large single crystal diamond, as tool materials, polycrystalline diamond (PCD) and polycrystalline diamond composite blade (PDC) have following advantages:
1. The crystal grains are disorderly arranged, isotropic, and of no cleavage surface. Therefore, unlike large single crystal diamond, they exhibit different strength, hardness, wear resistance peoperty on diferent crystal planes. In addition, the presence of cleavage surface brings brittleness.
2. They are high-strength, especially the PCD material boasting high impact strength due to the support of the cemented carbide matrix. When the impact is high, only small grains will break, instead of big chunks damage occuring to single crystal diamond. PCD materials or PDC materials can be used not only for precision cutting and general semi-precision machining, but also for rough machining and interrupted machining (such as milling, etc.) with a relatively large cutting output, which greatly expands the application of diamond tool materials.
3. They cut large pieces of polycrystalline diamond, used as materials for composite, which meets the needs of large processing tools such as milling cutters.
4. It can be made into special shapes to suit different processing needs. Due to the large-scale PDC tool and the improvement of processing technology, such as electric spark and laser cutting technology, triangle, herringbone and other special-shaped tool blanks can be processed and formed. In order to meet the needs of special cutting tools, it can also be designed into wrapped, sandwich and coiled PDC tool blanks.
In short, with the development of PCD and polycrystalline diamond composite blade tool materials, their applications have rapidly expanded to many manufacturing industries, and are widely used in non-ferrous metals (aluminum, aluminum alloy, copper, copper alloy, magnesium alloy, zinc alloy, etc. ), hard alloy, ceramics, non-metallic materials (plastics, hard rubber, carbon rods, wood, cement products, etc.), composite materials (fiber reinforced plastics, metal matrix composite materials MMCs, etc.) cutting processing. Especially in wood and automobile processing industry, they have become a high-performance alternative to traditional cemented carbide.