Lightweight-Low Expansion Al-Si Alloys
Light Weight-Low Expansion-High Thermal Conductivity Packaging Material(AlSi alloy) For Military,Aerospace,and Space Fields.
Baienwei company manufactures a range of Al-Si alloys:
● AlSi25 (AlSi25Cu4Mg) alloy;
● AlSi42 alloy, Al-42%Si alloy;
● AlSi50 alloy, Si-50%Al alloy;
● AlSi60 alloy, Si-40%Al alloy;
● AlSi70 alloy, Si-30%Al alloy;
● AlSi80 alloy, Si-20%Al alloy.
These advanced alloys(Al-Si alloys) have the unique combination properties,such as:
● Adjustable CTE, controllable CTE, in the range of 17-7ppm/℃
● Lightweight,such as 10% lightweight than pure aluminum; 25% the weight of Cu-Mo;55% the weight of Titanium;
● Good thermal conductivity,such as AlSi alloys = 120/175 W/m-K,BEW Al 6061(T6) =210;
● Ease of platable and machinable;
● Environmentally friendly.
Commonly Used Packaging Materials Performance Comparison:
| Grades | Content wt% | CTE 25℃ ppm/℃ | Thermal Conductivity 25℃W/mK | Density g/cm³ | Tensile Strength MPa | Yield Strength MPa | Poisson’s Ratio | Elongation % | Elastic Modulus GPa |
| AlSi27 | Al-27%Si | 17 | 175 | 2.64 | 170 | 130 | 0.29 | 3.8 | 91 |
| AlSi35, F | Al-35%Si | 15.1 | 152 | 2.54 | 165 | 95 | -- | 2.5 | 85 |
| AlSi42 | Al-42%Si | 13.5 | 160 | 2.55 | 200 | 187 | 0.29 | 1 | 105 |
| AlSi50 | Si-50%Al | 11.5 | 140 | 2.5 | 220 | 210 | 0.28 | <1 | 108 |
| AlSi60 | Si-40%Al | 9 | 125 | 2.46 | 181 | 181 | 0.27 | <1 | 121 |
| AlSi70 | Si-30%Al | 7.5 | 120 | 2.43 | 138 | 138 | 0.25 | <1 | 131 |
| AlSi80 | Si-20%Al | 6 | 110 | 2.40 | 125 | 125 | -- | -- | 132 |