Extreme Hard Materials

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Extreme Hard Materials

Monday, June 23rd, 2008 by www Subscribe To My Feed

Extreme hard materials are the result of recent research and development. The last century witnessed tremendous progress in many fields of science and technology including material science. The recent developments in science and technology resulted in the use of very hard materials in mechanical, automobile, precision metal stamping and aviation industries. This in turn resulted in the invention of new ultra hard cutting materials to make cutting tool to machine these parts. Beside carbide cutting material several other ultra hard materials like ceramic, polycrystalline diamond (PCD), mono-crystalline diamond (MCD-natural diamond), diamond coatings on cutting tools, synthetic mono-crystalline diamonds as well as polycrystalline cubic boron nitrite are developed.

Super Hard Materials
Proper use and applications of cutting tools made out of these ultra hard materials will result in noticable timing saving, increases cutting tool life, high cutting speeds, improved accuracy, high quality surface finish and can reduce the cost.
Polycrystalline Diamond (PCD)
Polycrystalline diamonds or PCD plates are produced by high temperature and high pressure method where the diamond coating is directly combined with a carbide support. Polycrystalline diamond is produced by sintering of high quality diamond powder with metallic binder. Depending upon the application polycrystalline diamond materials are available in various grain sizes. For instance the diamonds with rough grain sizes are used for manufacturing cutting tools with very good wear resistance due to its ability to retain cutting edge for a very long period. If you are looking for very high surface finish on manufactured item, and then super micro grain sizes are highly preferred.
Medium grain sizes are used for normal all purpose cutting tools since it is a balance between high wear resistance of rough grain size and superior finish of ultra micro grains. This makes the medium grain sized polycrystalline diamond as a very good choice for manufacturing high quality metal cutting tools.
Natural Diamonds
Mono crystalline diamond (MKD) is natural diamond out of pure carbon. These natural diamonds enable the manufacturing of geometric defined flutes with absolutely notch free flutes. Natural diamond (MKD) is one of the ultra hard materials which are appropriate for attaining superior surface finishes for mirror bright surfaces, machining of non-ferrous materials, micro machining and machining of titanium without burr.
Synthetic Mono-crystalline Diamond
More researches resulted in developing synthetic mono crystalline diamonds which are available in triangles and rectangle shapes with an edge length of approximately 8millmteres. The natural diamonds often contains nitrogen and it could have varying hardness and heat conductivity. On the other hand the synthetic mono-crystalline diamonds have uniform structure with same thermal conductivity and less internal stress.
Today synthetic mono-crystalline diamonds are being manufactured in various shapes and sizes which offers great application possibilities of this ultra hard material in future. Researches have found very good improvements in synthetic mono-crystalline tool life, improved surface finish and fixed wear and tear behavior compared to other ultra hard materials like PCD and natural diamond. Read more about ultra hard materials.

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