Isostatic Molding of Silicon Nitride Ceramic Molding
Silicon nitride ceramics is an inorganic material ceramic, which is one of the key indispensable materials in industrial technology and can be said to represent one of the main directions in the development of modern material science.
The properties of silicon nitride ceramics are mainly high temperature resistance, strong corrosion resistance, wear resistance and special electrical properties, which are incomparable to metals or other materials, and it is because of these properties that they are now widely used in mechanical engineering, aerospace and military, electronics, communications, automotive, energy, chemical and biological fields.
At the same time, silicon nitride ceramics also has high toughness, high flexural strength and high wear resistance, good thermal insulation, coefficient of thermal expansion close to steel and other performance advantages, so the use of silicon nitride ceramics also include structural ceramics field, mainly silicon nitride grinding media ball, silicon nitride ceramic bearings, high temperature stable wear-resistant workpiece, high temperature furnace crucible, high efficiency heating sheet and cutting tools, wear-resistant tools, cases and straps and other room temperature Wear-resistant parts, insulating materials, etc.
Isostatic molding of silicon nitride ceramic molding process
Isostatic molding of silicon nitride ceramics: Isostatic molding of silicon nitride ceramics is to place the specimen to be pressed in a high-pressure vessel, using the incompressible nature of the liquid medium and the nature of uniform transfer of pressure from all directions to uniformly pressurize the specimen, when the liquid medium through the pressure pump into the pressure vessel, according to the principles of fluid mechanics, the size of the pressure is constant and uniformly transferred to all directions. At this time, the powder in the high pressure vessel is uniformly pressurized in all directions and is of the same size. The method of forming dense blanks of barren powder by the above method is called isostatic pressure method.
The process of isostatic forming of silicon nitride ceramics:
1. The initial molding pressure is small, and the powder particles migrate and re-stack.
2. In the middle stage, the pressure is increased, and the powder flows and breaks up locally.
3. At the later stage when the pressure is maximum, the volume of powder is compressed and the pores are discharged, and the densification stage is reached.
Characteristics of isostatic molding of silicon nitride ceramics: The friction between the powder and the mold is high, and the pressure loss occurs along the pressing direction, making the density of each part of the blank uneven. In contrast, the pressure transmitted by the liquid medium is equal in all directions in isostatic molding. The deformation produced by the elastic mold under the pressure of the liquid medium is transferred to the powder in the mold, and the friction between the powder and the mold wall is low, resulting in a uniform force on the blank and a uniform density distribution.
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