低压冷喷涂增材制造铜基块体性能研究

Properties of Copper-Based Bulks materials Produced by Low Pressure Cold Spray Additives

摘要:

采用低压冷喷涂增材制造技术制备铜基块体材料,测试块体材料导热性能及力学性能,利用场发射扫描电镜对块体材料截面、拉伸断面进行观察与分析。结果表明,Al2O3体积比为10%的铜基粉末制备的铜基块体材料的导热性能较好,随着Al2O3含量的增加,铜基块体材料导热性能下降。冷喷涂铜基块体材料经退火处理后,导热性能及力学性能有所提升。随着退火温度的上升,热扩散率及抗拉强度呈现先上升后下降的趋势,在退火温度为500℃时,热处理态铜基块体材料热扩散率为加工态铜块体材料的80.43%,抗拉强度为125.3MPa。

Abstract:

The copper-based bulk materials were prepared by low-pressure cold spray additive manufacturing technology. The thermal conductivity and mechanical properties of the bulk materials were tested. The cross-section and tensile sections of the bulk materials were observed and analyzed by means of SEM. The results show that the thermal conductivity of copper-based bulk materials prepared from copper-based powders with a volume ratio of 10% Al₂O₃ is better. With the increase of Al₂O₃ content, the thermal conductivity decreases. After annealing, the cold-sprayed copper-based bulk material has improved thermal conductivity and mechanical properties. The thermal diffusivity and tensile strength show a trend of increasing first and then decreasing with the increase of annealing temperature. When the annealing temperature is 500℃, the thermal diffusivity of the heat-treated copper-based bulk material is 80.43% of the processed copper bulk material,the tensile strength is 125.3 MPa.