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  HOME > Characteristics of Fine Ceramics > Physical - Rigidity 
Physical
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Rigidity

Fine Ceramics (also known as “advanced ceramics”) possess high rigidity, which is measured by inspecting the elasticity of a specimen after applying a load. Materials that display less elastic deformation under load possess higher levels of rigidity. The coefficient of extension with respect to a load is called Young's modulus.

Using Young's modulus to measure rigidity, alumina and silicon carbide display nearly double the values of stainless steel. Why is high rigidity advantageous? It allows ceramic components to be manufactured to much higher levels of precision with regard to size and shape. In some cases, large mechanical stresses are generated on a material while it is being ground to final specifications. The less deformation that occurs during this process, the more precisely the parts can be processed.


Applications: Mechanical and structural components.

Description
Rigidity

Rigidity, also known as "stiffness," is generally measured using Young's modulus. It can be defined as the "force necessary to bend a material to a given degree."

As shown in the graph below, Fine Ceramics are highly rigid materials, according to Young's modulus. This makes their machining accuracy high enough to enable them to be used for high-precision parts.

Young's Moduluses
Image : Graph of Young's moduluses Fine Ceramics / Silicon Carbide430GPa, Alumina370GPa, Silicon Nitride290GPa, Zirconia200GPa, Metals / Cemented Carbide620GPa, Stainless Steel200GPa (Measuring method / Ultrasonic pulse method specified in JIS R 1602-1995)

  For more information, please see Excerpt of Graph Values.
 
Why High Rigidity Yields High Machining Accuracy
No deformation during machining / Alumina / Before processing / During machining / After machining / Stainless Steel / Accuracy cannot be achieved when deflections occur
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Hardness Rigidity Toughness Specific Gravity
   
 
The term "Fine Ceramics" is interchangeable with "advanced ceramics," "technical ceramics" and "engineered ceramics." Use varies by region and industry.
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