Silicon Nitride Ceramic Isostatic Pressing
Silicon nitride is an inorganic substance and an important structural ceramic material. It has high hardness, lubricity, and wear resistance. It is an atomic crystal; it is resistant to oxidation at high temperatures. Moreover, it can also resist the shock of cold and heat. It can be heated to above 1000 ℃ in the air, cooled rapidly and then heated rapidly, without breaking. It is precisely because of the excellent properties of silicon nitride ceramics that people often use it to manufacture mechanical components such as bearings, gas turbine blades, mechanical seal rings, and permanent molds. If the heat-receiving surface of engine components is made of silicon nitride ceramics that are resistant to high temperature and difficult to transfer heat, it can not only improve the quality of diesel engines, save fuel, but also improve thermal efficiency. Such diesel engines have been developed in China, the United States, Japan and other countries.
Silicon nitride ceramic isostatic pressing: Silicon nitride ceramic isostatic pressing is to place the sample to be pressed in a high-pressure container, and use the incompressible nature of the liquid medium and the property of uniform pressure transfer to uniformly press the sample from all directions. Pressurization, when the liquid medium is injected into the pressure vessel through the pressure pump, according to the principle of fluid mechanics, its pressure is constant and uniformly transmitted to all directions. At this time, the powder in the high-pressure container is subjected to uniform and consistent pressure in all directions. The method of forming a dense body from the barren powder by the above method is called the isostatic pressing method.
The process of isostatic pressing of silicon nitride ceramics:
1. When the initial molding pressure is small, the powder particles migrate and re-accumulate.
2. In the mid-term, the pressure is increased, and the powder is partially flowed and crushed.
3. When the pressure is the largest in the later stage, the volume of the powder is compressed and the pores are discharged to reach the densification stage.
The characteristics of isostatic pressing of silicon nitride ceramics: the friction between the powder and the mold is large, and the pressure will produce a pressure loss along the pressing direction, making the density of each part of the green body uneven. The pressure transmitted by the liquid medium during isostatic pressing is equal in all directions. The deformation of the elastic mold under the pressure of the liquid medium is transmitted to the powder in the mold. The friction between the powder and the mold wall is small, the green body is uniformly stressed, and the density distribution is uniform, and the product performance is greatly improved.
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