5. Coefficient of linear thermal expansion of various materials
The coefficient of linear thermal expansion shows the ratio of the expansion of the length of the object due to an increase in temperature by 1K(Kelvin). A prior confirmation of the coefficient of thermal expansion is important because there is possibility of causing a reliability problem when materials having large difference of the coefficient of thermal expansion are used in a device with intense thermal change.
| Coefficient of linear thermal expansion | |||
|---|---|---|---|
| Material |  |
MaterialEnglish | |
|
Silicic anhydride |
0.5 |
Aluminum |
25 |
|
Diamond |
1.1 |
Magnesium |
25.4 |
|
Tungsten |
4.3 |
Zinc |
26.3 |
|
SIC |
6.6 |
Tin |
26.9 |
|
Chromium |
6.8 |
Cadmium |
28.8 |
|
Platinum |
9 |
Lead |
29.1 |
|
MgO |
9.7 |
NaCl |
40.5 |
|
Iron |
12.1 |
Ice(0℃) |
50.7 |
|
Cobalt |
12.4 |
Sulphur |
64 |
|
Nickel |
12.8 |
Sodium |
75 |
|
Gold |
14.3 |
Potassium |
83 |
|
Copper |
16.8 |
Paraffin |
110 |
|
Silicon |
24 |
Rubber |
110 |
Coefficient of volume thermal expansion which is the ratio of changes of volume becomes 3 times of coefficient of linear thermal expansion.