Magnesium oxide coated with water resistant "WR Series" |
Magnesium carbonate Synthetic Magnesite "MAGTHERMO" |
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SL-WR | P-WR | PSF-WR | MS-PS | MS-L | MS-S | |
Avarage particle size(μm) | 9.8 | 3.2 | 1 | 21 | 8 | 1.2 |
Specific surface area(m2/g) | 5 | 8.8 | 6.6 | 0.1 | 0.5 | 5.5 |
MgO(%) | 97 | 96.3 | 97.5 | 47.6 | 47.4 | 47.4 |
Advantages | High thermal conductivity, good water resistivity with surface coating |
High thermal conductivity and water / acid resistant, softer than aluminium oxide. |
Generally plastics have good properties for electrical application like lightness and insulation but thermal conductivity is not very high of 0.1~0.3W/m・K.
Recently electrical components become smaller, thinner and higher-integrated.
To reduce heat buildup, various fillers such as Almina(Aluminium oxide), Silica(Silicon oxide) and Boron nitride are used as thermal conductivity fillers.
And Magnesium compounds are getting popular for this application in terms of high thermal conductivity, softness and cost.
Chemical formula | Feature | Performance comparison | |||||||
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Specific gravity | Thermal conductivity (W/m・K) |
Mors hardness | Thermal conductivity | Hardness | Water resistant | Acid resistant | cost | ||
Magnesium oxide | MgO | 3.6 | 45-60 | 6 | ○ | △ | × | × | ○ |
Magnesium carbonate | MgCO3 | 3 | 15 | 3.5 | ○ | ○ | ◎ | ○ | ○ |
Magnesium hydroxide | Mg(OH)2 | 2.4 | 8 | 2.5 | △ | ◎ | ◎ | × | ○ |
Silicon oxide (Fused Silica) | SiO2 | 2.6 | 2 | 6 | × | △ | ◎ | ◎ | ○ |
Aluminium oxide | Al2O3 | 3.9 | 20-35 | 9 | ○ | × | ◎ | ◎ | △ |
Hexagonal Boron nitride | BN | 2.3 | 30-50 | 2 | ○ | ◎ | ○ | ○ | × |
Silcon nitride | Si3N4 | 3.4 | 20-90 | 8 | ○ | × | ◎ | ○ | × |
Aluminium nitride | AlN | 3.2 | 150-250 | 7 | ◎ | △ | × | × | × |