Affiliation:
1. School of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2. School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, China
Abstract
Spark plasma sintering is a process of rapid, low-temperature, and high-density sintering. Moreover, traditional sintering methods can solve the problems of large grain sizes and low densities. The sintering temperature plays a crucial role in influencing the physical properties of high-silicon–aluminum (Si-Al) composites. This work investigated the impact of temperature on the microstructure, interface, and physical properties of high-Si-Al composites by spark plasma sintering. The results demonstrate that when the powder was processed by ball milling at a sintering temperature of 565 °C, the material exhibited the densest microstructure with minimal pore formation. The average size of the silicon phase is the smallest. The material’s thermal conductivity is 134.6 W/m·K, the thermal expansion coefficient is 8.55 × 10−6 K−1, the Brinell hardness is 219 HBW, the density is 2.415 g/cm3, and the density reaches 97.75%. An appropriate sintering temperature facilitates particle rearrangement and dissolution–precipitation processes, enhancing the material structure and performance.
Funder
National Natural Science Foundation of China
Key-Area Research and Development Program of Guangdong Province
Guangdong Provincial Key Laboratory of Advanced Forming of Light Metal Materials
Guangdong Basic and Applied Basic Research Foundation