Introduction to the whole process of sintering and processing of zirconia ceramics
Release time:2021-12-22 09:12:26    Author:

  Before sintering of zirconia ceramics: It is very important to control the temperature at this stage. If the temperature continues to rise, the embryo body of zirconia ceramics will shrink accordingly. There is basically no change in density and strength. If it is observed in a microscopic manner, the size of the grains will actually change, and the embryo of zirconia ceramics is the most prone to cracking at this stage. of.

  Zirconia ceramic insulating parts are more prone to cracking because the moisture and binder in the embryo body are discharged, so temperature control is particularly important. During the sintering of zirconia ceramics: During the whole process of sintering, the temperature will change slightly, and the embryo body of zirconia ceramics will continue to shrink. The change in density will be relatively large. If you observe the grains under the microscopic level, the change will not be particularly obvious. There will be no bonding between the particles, and the pores will become more and more. smaller.

  Because the zirconia ceramic magnetic head has a large change in the volume of the zirconia ceramic body, the phenomenon of cracking and deformation always exists. After sintering of zirconia ceramics: In the final sintering process, the temperature change is the largest, and the change between the density and the green body is also obvious. Whether it is microscopic or direct observation, the grains will change greatly, the pores will become smaller and smaller, and more single pores will be directly formed, so there will be more pores directly attached to the grains.

  The molding process of zirconia ceramics

  1、The ultra-high temperature technology for the preparation of zirconia ceramic powder can not only develop zirconia ceramics at low cost, but also develop new types of glass at low cost, such as optical fibers, magnetic glass, hybrid integrated circuit boards, zero-expansion glass-ceramics, high-strength glass , artificial bone, toothpicks, etc. The ultra-high temperature technology of zirconia ceramics has the following advantages: it can produce substances that cannot be produced by conventional methods; substances with extremely high purity can be obtained, which can greatly improve productivity and simplify operating procedures.

  2、Molding of zirconia ceramics The molding methods of zirconia ceramics are roughly divided into dry molding and wet molding. Dry molding includes steel molding, isostatic pressing, ultra-high pressure molding, powder electromagnetic molding, etc.; wet molding can be roughly divided into For plastic molding and gel casting. Zirconia ceramic colloid molding is a wet molding of a highly dispersed ceramic slurry, which can effectively control agglomeration and reduce defects compared to dry molding.

  3、Sintering of zirconia ceramics Due to its special performance requirements, zirconia ceramics require different firing and sintering technologies from traditional ceramics. Breakthrough progress has been made in the research on special furnace equipment.

  4、Precision machining of zirconia ceramics Zirconia ceramics are brittle materials with high hardness and high brittleness. Their physical and mechanical properties (especially toughness and strength) are quite different from those of metal materials, and their processing properties are poor and difficult to process. Therefore, studying the processing mechanism of zirconia ceramic materials and choosing the best processing method are the main problems to be solved.

  Methods and characteristics of zirconia ceramic processing

  Zirconia ceramic processing method

  Ceramics all have dimensional and surface accuracy requirements, but due to the large sintering shrinkage rate, the accuracy of the size of the ceramic body after sintering cannot be guaranteed, so it needs to be re-processed after sintering. The subsequent processing of zirconia ceramic products has become a special ceramic manufacturing technology indispensable important link.

  The machining of zirconia ceramic epoxied zirconia ceramics is carried out by the accumulation of microscopic deformation or removal of materials at the machining point. The relationship between the defects is different, and the processing principle is also different. There are many methods for processing zirconia ceramics according to different product performance requirements and different processes. The processing of zirconia ceramics is generally based on mechanical processing.

  Features of zirconia ceramic processing

  1、Ceramics are considered hard and brittle materials: high hardness and high strength are one of the advantages of ceramic materials, but they also become a major problem in the subsequent processing of ceramic materials.

  2、Ceramic materials have low electrical conductivity and high chemical stability. Therefore, these characteristics of ceramic materials must be considered during subsequent processing. Generally, electrical machining or chemical etching ceramic finishing cannot be used. According to the different processing energy methods, it can be summarized as mechanical processing, chemical processing, photochemical processing, electrochemical processing and other processing methods. Among them, the processing methods of mechanical methods are further divided into abrasive processing and tool processing. Among them, abrasive processing is further divided into grinding, superfinishing, grinding, ultrasonic processing and other methods. According to different performance requirements, the processing methods of zirconia ceramics are different.