The reason why diamond compacts are so widely used in today's industrial society is mainly because diamond compacts have the superior properties of other materials. Let's analyze the superior properties of diamond compacts:

 

The diamond composite sheet has high hardness and wear resistance (abrasion ratio). The hardness of diamond composite sheet is as high as about 10,000 HV, which is the hardest material in the world's artificial substances, and the hardness is much higher than that of cemented carbide and engineering ceramics. Due to its high hardness and isotropy, it has better wear resistance. Generally, the wear resistance of the composite sheet is reflected by the wear ratio. In the mid-1980s and 1990s, the wear ratio of the composite sheet was 40,000 to 60,000 (80,000 to 120,000 in foreign countries); from the mid-1990s to the present, the composite sheet was The wear ratio is 80,000 to 300,000 (100,000 to 500,000 abroad).

 

The diamond compact is thermally stable. 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 to measure the quality of PDC, as well as its strength and wear ratio. Heat-resistant stability refers to the stability of the chemical properties of the polycrystalline layer (the degree of diamond inking), the change of macroscopic mechanical properties and the bonding of the interface of the composite layer after heating to a certain temperature in an atmospheric environment (in the presence of oxygen). effect of firmness. Changes in thermal stability after sintering at 750 °C, the wear ratio of some domestic manufacturers' products increased by 5% to 20%, and the impact toughness did not change much. The formula and process used are different, and the wear ratio and impact toughness of foreign diamond composite sheets do not change much before and after sintering.

 

The diamond composite sheet has impact toughness. As a cutting tool, diamond compacts 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, the friction between the drilling tool and the hole wall, the bending of the drill pipe string, the unevenness of the bottom of the hole, the residual rock powder, and the vibration of the drilling rig, etc. The diamond compact is subjected to a large impact force. The impact resistance of the diamond composite sheet reflects the toughness and bonding strength of the composite sheet, which is a comprehensive index and the key to determining its use effect. In the mid-1980s and 1990s, the impact toughness of the composite sheet was 100-200 J (200-300 J abroad), and from the mid-1990s to the present, the impact toughness was 200-400 J (more than 400 J abroad). ).

 

The above points are the superior properties of the diamond composite sheet, and it is also the reason why the diamond composite sheet is widely used in the current industrial society.