The Structure and Characteristics of Diamond Drill Bits

Diamond Core Bits cutting tooth materials are divided into two categories: natural diamond and synthetic diamond. Diamond is a crystal of carbon. The crystal structure is a regular tetrahedron. The carbon atoms are connected by covalent bonds. The structure is very stable. Typical shapes include cubes, octahedrons and dodecahedrons.

Diamond Core Bits

Diamond Tools are the hardest, most compressive, and wear resistant materials currently known to mankind. Therefore, it is the most ideal material for the cutting edge of a drill.

However, diamond as a material for the cutting edge of a drill bit also has major weaknesses. First, its brittleness is relatively large, and it will crack when encountering impact load. Second, its thermal stability is poor. Diamond burns to carbon dioxide and carbon monoxide at high temperatures. In the air, between 455 and 860°C, the diamond will undergo graphitization and combustion; it will not burn in inert or reducing gases. It will oxidize, but at about 1430°C, the diamond crystal will burst suddenly and become graphite. Therefore, in the design, manufacture and use of diamond drill bits, it is necessary to prevent the diamond material from being subjected to high impact loads and to ensure timely cooling of the diamond cutting teeth.

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