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Performance analysis of diamond compact
Time：2018-04-27
The reason why diamond composite sheets are so widely used in industrial society today is mainly because diamond composite sheets have unparalleled superior properties of other materials. Today, we analyze the superior performance of diamond composites for everyone:
First, the diamond composite sheet has a high hardness and wear resistance (wear ratio). The hardness of the diamond compact is as high as 10 000 HV. It is the hardest material in the world, and it is much harder than cemented carbide and engineering ceramics. Due to its extremely high hardness and isotropic properties, it has excellent wear resistance. The abrasion resistance of the composite sheet is generally reflected by the wear ratio. In the mid-1980s and 1990s, the composite sheet wear ratio was 4 to 60,000 (80 to 120,000 in foreign countries); in the mid-1990s to the present, the composite sheet The wear ratio is 8 to 300,000 (10 to 500,000 in foreign countries). The
Second, the diamond compact has thermal stability. The thermal stability of the diamond composite sheet determines its range of use. The thermal stability of the composite sheet is heat resistance, which is one of the important performance indicators for measuring the quality of the PDC as well as the strength and wear ratio. Heat-resistant stability refers to the heating to a certain temperature in the atmospheric environment (with the presence of oxygen), the stability of the chemical properties of the polycrystalline layer after cooling (the degree of diamond inking), the change in macroscopic mechanical properties, and the combination of interfaces to the composite layer. The effect of firmness. After the change of thermal stability was sintered at 750°C, the products of some domestic manufacturers showed a 5% to 20% increase in wear ratio, and the impact toughness did not change much. The wear ratio of some manufacturers decreased, and the impact resistance decreased. This was related to various units. The use of different formulations and processes related to foreign diamond composite wear ratio and impact toughness before and after sintering changes little. The
There are also diamond composites that have impact toughness. As a cutting tool, diamond composite sheets are widely used in oil and gas drilling operations. During the drilling process, due to the combined effect of axial force and horizontal cutting force, friction between the drilling tool and the hole wall, bending of the drill pipe column, uneven hole bottom and residual rock powder, drilling machine vibration and other factors, the drill bit Diamond compacts are subjected to great impact. The impact resistance of diamond composite sheet reflects the toughness and bond strength of the composite sheet. It is a comprehensive index, and it is also the key to determine the effectiveness of the composite sheet. In the mid-1980s and the mid-1990s, the impact toughness of the composite sheet was 100 to 200 J (200 to 300 J in foreign countries). From the mid-1990s to the present, the impact toughness was 200 to 400 J (more than 400 J in foreign countries. ).
The above points are the superior performance of diamond composite sheets and why diamond composite sheets are widely used in industrial society.
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