(湖南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410082)
摘 要: 采用一種新的楔壓工藝—梯溫楔壓，對噴射沉積態(tài)SiCP/7090鋁基復(fù)合材料進(jìn)行致密化加工，并測定壓制后坯料的密度和硬度。結(jié)果表明，坯料在模具中加熱90 min后正面與側(cè)面分別呈現(xiàn)出180 ℃和250 ℃的溫度梯度，坯料在高向變形為25%時，致密化效果較好，密度與硬度均呈現(xiàn)出沿高向逐漸減小的趨勢，相對密度最高達(dá)到98%，與恒溫楔壓時坯料的相對密度最高為95%相比，梯溫楔壓工藝有效提高了坯料的相對密度，硬度最高值達(dá)到HB92。在315T液壓機(jī)上實現(xiàn)了高向為200 mm的多孔材料的致密化加工。
關(guān)鍵字: SiCp/7090鋁基復(fù)合材料；梯溫楔壓；多層噴射沉積；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
