A New Processing Method of Zirconia Ceramics-Chemical Mechanical Processing

Zirconia ceramics is very difficult to machine because of its hardness, which is second only to diamond. The following Kezhong Ceramics Factory will introduce a new machining method of zirconia ceramics-chemical machining method.

In order to avoid the damage caused by hard abrasive to the machined surface of zirconia ceramics, relevant scholars have become interested in chemical mechanical machining. Its basic idea is to combine chemical action with mechanical action. The chemical reaction produces soft compounds or forms eutectic with low melting point, which can be quickly removed by mechanical action. Because the removal force is very small, the unreacted matrix will not be damaged.

Finishing ceramic shaft sleeve

The abrasive particles are in contact with the microscopic convex peaks of the workpiece. Under a certain pressure, the convex peaks of the workpiece pierce the abrasive particles, resulting in high temperature and high pressure, which activates the chemical reaction between them. With the relative movement between the abrasive particles and the workpiece, the products of the reaction are taken away by the abrasive particles. The key of this process is to choose suitable abrasive, that is, to ensure that chemical reaction can occur between abrasive particles and workpiece, resulting in soft compounds or eutectic with low melting point. By controlling the pressure and sliding speed, the control of the process can be conveniently realized.

The current process data show that the most suitable abrasive for finishing (polishing and grinding) zirconia ceramics is chromium trioxide, and the most suitable abrasive for processing aluminum trioxide is silicon dioxide. Si3 N4 and SiC react with Cr2 03 to produce CrN and CrSiz；; The function of alumina is to form alumina with low melting point · 2Si02 mullite crystal.

At present, there is no commercial special chemical mechanical processing technology and equipment, and most of them are processed by diamond tools and only changed abrasives. In order to activate the solid-state reaction, it is necessary to generate pressure between the abrasive particles and the convex peak of the workpiece, so the polishing process of suspended abrasive only changes the abrasive, and the processing efficiency is lower than that of diamond abrasive. The reason is that the chemical reaction is weak, so the process equipment needs to be reformed. Such as enhancing the magnetic field strength of magnetic abrasive polishing, and designing a special polishing tool head. Up to now, there is no suitable process device for chemical mechanical polishing of zirconia ceramic surfaces with arbitrary shapes, especially the polishing of inner cavity surfaces, which needs further research and development.

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