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A Grease Test of LW-9389 TIM Thermal Resistance and Conductivity Measurement Apparatus
STEP 1.Have 3 thickness conditions by using specialized fixtures.
Record following parameters by PC-based data acquisition software
Calculate thermal resistance (R, ℃/W) and thermal impedance (I, ℃cm²/W) of each condition.
| Th | Tc | P | Q | R | I | t |
| ℃ | ℃ | psi | W | ℃/W | ℃*cm²/W | cm |
| 80.00 | 72.90 | 40.05 | 58.20 | 0.122 | 0.787 | 0.01 |
| 80.00 | 70.00 | 40.05 | 53.76 | 0.186 | 1.200 | 0.02 |
| 80.00 | 68.03 | 40.05 | 50.70 | 0.236 | 1.523 | 0.03 |
Measuring and calculated parameters
Th: Hot surface temperature;
Tc: Cold surface temperature;
P: Press load;
Q: Heat flux;
R: Thermal resistance;
I: Thermal impedance;
t: Thickness
STEP 2.
Plot the correlation of thermal impedance and specimen thickness.
Thermal conductivity (K) of the specimen: 2.72 W/m℃ can be got
by the slope after simply unit conversion.
The intercept is the contact impedance caused from the contact condition
between the specimen and meter bar surfaces.
Back to LW-9389 specification