Thermal conductivity and reliability reinforcement for sintered microscale Ag particle with AlN nanoparticles additive

To meet the increasing requirement of high-temperature die attach for power module on the excellent thermal conductivity and reliability, a novel Ag paste modified with AlN nanoparticles was designed. The thermal conductivity of the joint sintered by this modified Ag paste during long-term thermal aging was tested. It was found that with 1 wt% addition of AlN nanoparticles, the thermal conductivity of the joint was increased from 164.3 to 273.0 W/(K center dot m) due to the significant decrement of porosity. But the thermal conductivity of sintered joints was decreased slightly with the excessive addition of AlN nanoparticles. Meanwhile, the increasing porosity and pore size were observed in all joints during the following thermal aging and hence the thermal conductivity was decreased. But the pore growth in the joint sintered by Ag paste consisting of 1.0 wt% AlN nanoparticles was quite limited, which still had a high thermal conductivity of 249.4 W/(K center dot m) after 1008 h thermal aging, showing great thermal conductivity and reliability.

Automated summary

In order to meet the requirements for high-temperature die attach in terms of thermal conductivity and reliability, a novel Ag paste modified with AlN nanoparticles was developed. The thermal conductivity of the joint sintered by this modified Ag paste was tested after long-term thermal aging. It was found that the addition of 1 wt% AlN nanoparticles significantly reduced the porosity of the joint, resulting in an increase in thermal conductivity from 164.3 to 273.0 W/(K center dot m). However, excessive addition of AlN nanoparticles slightly decreased the thermal conductivity of the sintered joints. Furthermore, all joints experienced an increase in porosity and pore size during thermal aging, leading to a decrease in thermal conductivity. Nevertheless, the joint sintered with 1.0 wt% AlN nanoparticles still exhibited a high thermal conductivity of 249.4 W/(K center dot m) after 1008 hours of thermal aging, demonstrating excellent thermal conductivity and reliability.