Properties of Diamond Compacts Having Different Grain Sizes with MgCO_3 Sintering Agent
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Two sorts of diamond-MgCO<SUB>3</SUB> compacts with grain sizes of 6∼12μm (mean grain size: 7. 5μm) and 20∼40μm (mean grain size: 23μm) were prepared and examined. The effects of diamond grain size on the amount of MgCO<SUB>3</SUB> and Knoop hardness were not remarkable. The coarser grained diamond compact with MgCO<SUB>3</SUB> sintering agent exhibited little better wear resistance than the finer grained one and showed tiny flaking on a rake face and small recession of a cutting edge in a cutting test of granite. When compared with a conventional diamond-Co system, the effects of a sort of a sintering agent on the properties of compacts were much more remarkable than those of diamond grain size. Namely, the diamond-MgCO<SUB>3</SUB> compacts showed much smaller amount of a sintering agent, higher hardness and better cutting performance for granite, irrespective of grain size.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 969-971, 1998
The Japan Society of High Pressure Science and Technology