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  HOME > Characteristics of Fine Ceramics > Thermal - Thermal Expansion 
Thermal
Heat Resistance Thermal Expansion Thermal Conductivity
Low Thermal Expansion
When materials are heated, their size and volume increase in small increments, in a phenomenon known as thermal expansion. Expansion values vary depending on the material being heated. The coefficient ratio of thermal expansion indicates how much a material expands per 1oC (2.2oF) rise in temperature. Fine Ceramics (also known as “advanced ceramics”) have low coefficients of thermal expansion — less than half those of stainless steels.

Applications: Parts for high-precision measuring equipment.

Description
Coefficient of Thermal Expansion
The ratio that a material expands in accordance with changes in temperature is called the coefficient of thermal expansion. Because Fine Ceramics possess low coefficients of thermal expansion, their distortion values, with respect to changes in temperature, are low. The coefficients of thermal expansion depend on the bond strength between the atoms that make up the materials. Covalent materials such as diamond, silicon carbide and silicon nitride have strong bonds between atoms, resulting in low coeficients of thermal expansion. In contrast, materials such as stainless steel possess weaker bonds between atoms, resulting in much higher coefficients of thermal expansion in comparison with Fine Ceramics.

Coefficients of Thermal Expansion
Image : Graph of Coefficients of Thermal Expansion  Fine Ceramics / Zirconia10.5×10-6/°C, Alumina7.2×10-6/°C, Silicon Carbide4.4×10-6/°C, Silicon Nitride2.6×10-6/°C,  Metals / Stainless Steel18.0×10-6/°C, Cemented Carbide5.5×10-6/°C  Compared to general metals, Fine Ceramics have low coefficients of thermal expansion and display small dimensional changes with changes in temperature.  (Measuring method / JIS R 1618-1994)
  For more information, please see Excerpt of Graph Values.
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Heat Resistance Thermal Expansion Thermal Conductivity
   
 
The term "Fine Ceramics" is interchangeable with "advanced ceramics," "technical ceramics" and "engineered ceramics." Use varies by region and industry.
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