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Several Machining Technology of Silicon Nitride Ceramics


The hardness of silicon nitride ceramics is higher than that of silicon carbide. Although it is very difficult to process, there are still many machining methods. Below we will share with you three methods for machining silicon nitride ceramics.

1. Machining of silicon nitride ceramics

As far as the machining process of silicon nitride is concerned, it is mainly divided into cutting and grinding. The characteristic of machining is that the machining shape is accurate, but the precision of the machine tool is high. It is necessary to use a diamond tool to remove the material with a small amount of cutting. The removal mechanism is mainly the plastic deformation of the workpiece. Grinding is the most important machining method of silicon nitride ceramics. Its machining mechanism is to remove silicon nitride materials through plastic deformation or brittle fracture during grinding to form a new surface. The characteristic of mechanical machining is that long-term machining can obtain high dimensional accuracy, but the treatment of grinding debris and the selection of grinding wheel particle size have a greater impact on the machining quality.

2. Ultrasonic machining of silicon nitride ceramics

Ultrasonic machining is mainly used to process round holes, shaped holes, cavities, and micro holes. The ultrasonic vibration tool is used, and the diamond abrasive suspension is filled between the tool and the workpiece. The ultrasonic vibration at the end of the tool causes the impact damage of the machined surface to form powder and remove the silicon nitride ceramic. Ultrasonic machining of hard and brittle materials is one of the most commonly used methods. This method has the following disadvantages: (1) It is troublesome to replace the machining tool; (2) The quality of the tool is affected by factors such as the change of tool quality and force transmission; (3) The tool wears seriously and the machining efficiency is low.

3. Electrical machining of silicon nitride ceramics

EDM is mostly used for perforation forming and wire cutting, and has the advantages of less workpiece loss, less thermal impact on the surface of the workpiece, no pollution to the environment, and less fire. The principle is that the tool electrode and the workpiece are placed in an insulating working fluid, and the surface material of the workpiece is melted and vaporized to be removed by the etching action of high-energy plasma suspended in the dielectric. The processability of a material depends on the thermal properties of the material, independent of its mechanical properties. The conductivity of silicon nitride ceramics is weak, and it is generally not suitable for EDM. However, with the development of basic theory research, new technology development, new high-speed, high-precision EDM machine tool development at home and abroad in recent years, high-voltage EDM can also be used to process silicon nitride ceramic materials. The principle is that an insulating ceramic material workpiece is placed between the sharp electrode and the flat electrode, and a high voltage is used to make the medium break down, and a glow discharge erosion occurs. This method has a rougher surface and a shallower machining depth, which requires mechanical machining.

The above introduces three machining methods of silicon nitride ceramics. If you need to find a silicon nitride ceramic machining manufacturer, please contact Pintejin Ceramics. Our service hotline is: +86 769 82886112.

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