Introduction of Machining Methods for Micro-structure of Zirconia Ceramics

Zirconia ceramics is a kind of high temperature resistant ceramics, and its excellent mechanical properties make it widely used. Similarly, the processing method of zirconia ceramics has also become a research hotspot. The following Kezhong Ceramics Factory will introduce the machining method of zirconia ceramics' microstructure.

Adding three-dimensional structure to ceramic green blank by micro-machining can improve machining efficiency and reduce cost, which is a promising machining method.

Control of dimensional accuracy in machining edge of micro-structure on zirconia ceramic green blank. Zirconia ceramic green body is shaped by pressure and has a certain strength. The bending strength of green body under different pressing pressures is measured by three-point bending experiment, and the relationship between bending strength and pressing pressure is obtained. With the increase of pressing pressure, the strength of green body also increases, and basically changes linearly.

Zirconia ceramic special-shaped block

Judging the machining quality of zirconia ceramics by comparing micro-junctions, the results show that the greater the strength of zirconia ceramics, the better the machining quality of zirconia ceramics. The green body of zirconia ceramics will have a certain volume shrinkage after sintering, and the shrinkage rate of the green body pressed under pressure will change. Under the same pressure, the shrinkage of zirconia ceramic blank in X direction and Y direction is the same, and there is no obvious difference in xY direction shrinkage at different heights. With the increase of pressure, the shrinkage in X, Y and Z direction decreases gradually, and the shrinkage in Z direction is more sensitive to pressure.

In order to obtain a fine structure with correct size, zirconia ceramics focus on the control of Z-R size. The axial deformation of the machining system is obtained, and the variation law of axial machining force and the stiffness of the system under certain machining parameters are obtained, and the axial deformation of the system is determined.

The relative volume loss rate of the tool in the initial wear stage and normal wear stage, and the empirical formula for calculating the axial loss of the tool is deduced. Finally, the system shaft self-deformation, tool wear and shrinkage are compensated, and the miniature cavity is machined on the green blank. The results show that the machining and firing dimensions are basically the same as the target dimensions, and the maximum absolute deviation in Z direction after green blank working is 1. 4 mm, and after densification and sintering, the maximum absolute deviation in Z direction is 3.8mm, which indicates that the compensation method adopted can effectively control the Z direction dimensions.

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