(湖南大学 材料科学与工程学院，长沙 410082)
摘 要: 采用一种新的楔压工艺—梯温楔压，对喷射沉积态SiCP/7090铝基复合材料进行致密化加工，并测定压制后坯料的密度和硬度。结果表明，坯料在模具中加热90 min后正面与侧面分别呈现出180 ℃和250 ℃的温度梯度，坯料在高向变形为25%时，致密化效果较好，密度与硬度均呈现出沿高向逐渐减小的趋势，相对密度最高达到98%，与恒温楔压时坯料的相对密度最高为95%相比，梯温楔压工艺有效提高了坯料的相对密度，硬度最高值达到HB92。在315T液压机上实现了高向为200 mm的多孔材料的致密化加工。
关键字: SiCp/7090铝基复合材料；梯温楔压；多层喷射沉积；致密化
（College of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:A novel technique called temperature gradient cyclic pressing was developed to improve the formability of spray deposited aluminum alloy preforms. Spray deposited SiCp/7090 Al-base composite was densified by temperature gradient cyclic pressing, and the density, hardness and microstructure of the composite were studied. The results show that the temperature gradient on the front face of billet is 180 ℃, while 250 ℃ on the side face of the billet is got when heated in the die for 90 min. When the billet reduces by 25% in height, the effect of densification for the billet is better, the maximum relative density is 98%. However, the maximum relative density is 95% when the same billet is pressed with constant temperature gradient cyclic pressing. The maximum hardness is HB92. It is easier for temperature gradient cyclic pressing to densify the porous materials with the height of 200 mm through the 315T hydraulic press.
Key words: SiCp/7090 Al-base composite; temperature cyclic pressing; multi-layer spray deposition; densification
