Sintering equipment in diamond tool manufacturing

Diamond tools have become an indispensable part of modern manufacturing processes, and the manufacturing of diamond tools requires the use of sintering equipment. The sintering process used to manufacture diamond tools is a vital step that determines the quality of the final product. There are several sintering methods available including conventional box-type furnaces, resistance-heated sintering furnaces, pressure induction sintering furnaces, and pressure shielded sintering furnaces. In this paper, we will provide an overview of each sintering method and discuss their advantages and disadvantages.

Conventional Box-Type Furnaces

The box-type furnace is the oldest and most commonly used sintering method for diamond tool manufacturing. It is characterized by simple structure, large capacity, and low price. The box-type furnace uses resistance heating elements to heat the furnace chamber, and the temperature inside the furnace can reach up to 1600°C. During sintering, the diamond powder and metal powders are placed in an alumina crucible inside the furnace, and the powders are sintered at high temperatures for several hours.

One of the disadvantages of using the box-type furnace is that the temperature inside is not uniform, which leads to uneven sintering and low product quality. Additionally, the purity of the diamond material cannot be guaranteed in the box-type furnace, which can lead to low-quality products.

Resistance-Heated Sintering Furnaces

Resistance-heated sintering furnaces, also known as straight resistance sintering furnaces, use resistance heating elements to heat the sintering furnace. The furnace consists of a graphite induction ring that tightly wraps around the crucible with the powders, and the furnace is heated by the resistance of the graphite ring. The temperature in the resistance-heated sintering furnace can reach up to 2500°C.

One of the biggest advantages of using resistance-heated sintering furnaces is that the temperature in the furnace is uniform, which leads to high-quality products. Additionally, resistance-heated sintering furnaces can use highly pure diamond powders, which reduces impurities in the final product.

Pressure Induction Sintering Furnaces

Pressure induction sintering furnaces are a new method of sintering diamonds, and they use a combination of pressure and induction heating. The furnace consists of an induction coil that generates a strong magnetic field, which heats the metal materials and the diamond crystals. The sintering process can be conducted under high pressure, which leads to a highly dense material.

One of the main advantages of using pressure induction sintering furnaces is that the sintering process is fast and can be completed in a matter of minutes. Additionally, the uniformity of the temperature and pressure inside the furnace ensures high-quality products.

Pressure Shielded Sintering Furnaces

Pressure-shielded sintering furnaces are similar to pressure induction sintering furnaces but have added advantages. The furnace consists of an induction coil, an insulated chamber, and a pressure chamber. The diamond powders and metal powders are placed in the insulated chamber, and the pressure chamber is connected to an external pressure source. The combination of pressure and induction heating leads to highly dense and high-quality products.

One of the advantages of using pressure-shielded sintering furnaces is that the pressure can be optimized to control the density of the final product. Additionally, the vacuum inside the insulated chamber ensures the purity of the diamond material, leading to high-quality products.

Conclusion

In conclusion, sintering is a vital step in the manufacturing of diamond tools, and choosing the right sintering method can determine the quality of the final product. There are several sintering methods available, including conventional box-type furnaces, resistance-heated sintering furnaces, pressure induction sintering furnaces, and pressure shielded sintering furnaces. Each of these methods has its advantages and disadvantages, and choosing the right method depends on several factors such as the required sintering temperature, the size and shape of the product, and the required level of purity.