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Write a short note on TCE

Mumbai University > Electronics Engineering > Sem 8 > MEMS Technology

Marks: 5M

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• TCE [Thermal co-efficient of expansion] : The co-efficient of thermal expansion is defined as the fractional increase in the length per unit rise in temperature.

• Usually, TCE is specified over a temperature range because it varies depending on the temperature.

• The equation below describes a linear thermal expansion

$\frac{ \triangle L}{L} = \alpha_L \triangle T$

where, $\triangle L$ = change in length

L = original length

$\alpha_L$ = Linear co-efficient of thermal expansion

$\triangle T$ = change in temperature.

Issues related to TCE :

1. The TCE is often not the same in all axes. In MEMS structure the values are different X and Z plane.

2. TCE , it is rarely linear and should be quoted either at a specific temperature or an average over a given temperature range.

3. The variation in TCE with temperature is only a fairly smooth function if the material is undergoing no phase transitions.

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0views
• TCE [Thermal co-efficient of expansion] : The co-efficient of thermal expansion is defined as the fractional increase in the length per unit rise in temperature.

• Usually, TCE is specified over a temperature range because it varies depending on the temperature.

• The equation below describes a linear thermal expansion

$\frac{ \triangle L}{L} = \alpha_L \triangle T$

where, $\triangle L$ = change in length

L = original length

$\alpha_L$ = Linear co-efficient of thermal expansion

$\triangle T$ = change in temperature.

Issues related to TCE :

1. The TCE is often not the same in all axes. In MEMS structure the values are different X and Z plane.

2. TCE , it is rarely linear and should be quoted either at a specific temperature or an average over a given temperature range.

3. The variation in TCE with temperature is only a fairly smooth function if the material is undergoing no phase transitions.