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Deformation of silicon carbide sheet
Deformation rate range
The deformation rate of silicon carbide sheet is generally between 0.01% and 5%, but this range is not absolute, because it is affected by many factors such as material density, molding process and shape size.
Influence factor
1. Material selection and ratio Raw material quality: The selection of high-purity and low-impurity silicon carbide powder as the substrate to ensure the stability and consistency of raw materials. Ratio optimization: According to the requirements of the specific application scenario, the ratio of silicon carbide powder and other additives (such as burning agents, binders, etc.) is adjusted to obtain the best physical and chemical properties, thereby reducing the risk of deformation.
2. Material density: the higher the density of silicon carbide plate, the greater its stiffness, so the deformation rate is relatively small. On the contrary, the silicon carbide plate with lower density has smaller stiffness and relatively larger deformation rate.
3. Molding and sintering process:
forming method
Select the appropriate molding method, such as dry pressing, extrusion, grouting or isostatic pressing, etc., to ensure that the internal stress distribution of the sheet is uniform during the molding process. Strictly control the pressure, temperature, time and other parameters in the molding process to avoid internal defects and deformation caused by improper molding.
Sintering of silicon carbide sheets
In the direct sintering process, the silicon carbide powder and auxiliary materials are mixed and compacted, and then the sheet is made by sintering and other steps. This process has a certain effect on the deformation rate of the sheet metal. The reaction sintering process is to form pure silicon carbide through high temperature reaction and then sintering, its deformation rate may also be different due to different process parameters.
4. Shape and size:
The shape and size of the sheet is also an important factor affecting its deformation rate. Generally speaking, the thinner the plate, the greater its deformation rate; The thicker the plate, the smaller the deformation rate. In addition, shape and size factors such as length-width ratio and thickness ratio also affect the deformation rate.
The deformation of silicon carbide sheet may be caused by a variety of reasons, including but not limited to the following:
1. Material quality problems: such as the purity of silicon carbide raw materials, impurity content, etc., may affect the deformation performance of the plate.
2. Improper process control: In the process of molding, sintering and other processes, if the temperature, pressure and other parameters are improperly controlled, it may also lead to sheet deformation.
3. Conditions of use: During the use of silicon carbide sheet, if affected by extreme conditions such as high temperature and high pressure, deformation may also occur.
Measure:
1. Optimize material selection: Select silicon carbide raw materials with high density and stable quality to improve the stiffness and deformation properties of the plate.
2. Improve the molding process: By optimizing the molding process parameters, such as increasing the compaction density, controlling the sintering temperature, etc., to reduce the deformation rate of the sheet.
3. Reasonable design of shape and size: According to the needs of the use of reasonable design of the shape and size of the plate, avoid too thin or too long plate design to reduce the risk of deformation. ,
4. Strengthen the use of management: pay attention to the control of temperature, pressure and other conditions during use to avoid extreme conditions causing damage to the plate.
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