Thermal Contact Resistance: aln_al_bare_1MPa to alumina_steel_grease_1MPa
Thermal contact resistance and conductance for material interfaces — bolted joints, pressed contacts, greased interfaces, thermal pads, and bare metal-to-metal contacts
| contact id | conductance W m2K (W/m2K) | contact pressure MPa (MPa) | contact resistance m2KW (m2K/W) | environment | interface material | material 1 | material 2 | notes | surface finish | temperature C (C) |
|---|---|---|---|---|---|---|---|---|---|---|
| aln_al_bare_1MPa | 2,000 | 1 | 0.0005 | air | none | aluminum_nitride_ceramic | aluminum | AlN (k~170 W/mK) on aluminum; higher conductance than Al2O3 due to higher k of AlN itself | ground | 25 |
| alumina_al_bare_0p5MPa | 500 | 0.5 | 0.002 | air | none | alumina_ceramic | aluminum | Alumina ceramic on aluminum; lighter clamping typical of power electronics insulator pads; very high resistance | ground | 25 |
| alumina_al_pad_0p5MPa | 2,000 | 0.5 | 0.0005 | air | silicone_thermal_pad | alumina_ceramic | aluminum | Alumina insulator + silicone pad on aluminum heatsink; standard transistor/IGBT mounting | as-machined | 25 |
| alumina_steel_bare_1MPa | 700 | 1 | 0.00143 | air | none | alumina_ceramic | carbon_steel | Al2O3 alumina (99%) on steel; ceramic-metal; low conductance due to ceramic hardness limiting real contact area | ground | 25 |
| alumina_steel_grease_1MPa | 4,000 | 1 | 0.00025 | air | thermal_grease | alumina_ceramic | carbon_steel | Al2O3 on steel with thermal grease; grease critical for ceramic-metal joints due to poor bare contact | ground | 25 |
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