文章以氮化铝(AlN)粉末为基体材料,以氧化钙(CaO)和氧化钇(Y2O3)为烧结助剂,掺杂酸洗处理后的多壁碳纳米管(CNTs)为增韧材料,采用机械球磨后热压烧结的方法制备氮化铝-碳纳米管(AlN-CNTs)复合材料。通过X射线衍射仪(X-ray diffraction,X...文章以氮化铝(AlN)粉末为基体材料,以氧化钙(CaO)和氧化钇(Y2O3)为烧结助剂,掺杂酸洗处理后的多壁碳纳米管(CNTs)为增韧材料,采用机械球磨后热压烧结的方法制备氮化铝-碳纳米管(AlN-CNTs)复合材料。通过X射线衍射仪(X-ray diffraction,XRD)和扫描电子显微镜(scanning electron microscope,SEM)对AlN-CNTs复合材料的成分结构及微观形貌进行表征,并测试其物理力学性能。研究表明:随着烧结温度的升高,AlN-CNTs复合材料的力学性能也随之提升;在1750℃的烧结温度下,随着碳纳米管质量分数的增加,AlN-CNTs复合材料的抗弯强度和断裂韧性先上升后下降,且当碳纳米管质量分数为1%时复合材料的力学性能最佳。碳纳米管在AlN-CNTs复合材料中的增韧机制主要是碳纳米管的拔出、碳纳米管的桥连和裂纹的偏转。展开更多
Nano-AlN and submicron-Al_(2)O_(3) particles were simultaneously utilized in a 6061 Al matrix composite to improve the high-temperature strength.According to the SEM and TEM characterization,nano-AlN and submicron-Al_...Nano-AlN and submicron-Al_(2)O_(3) particles were simultaneously utilized in a 6061 Al matrix composite to improve the high-temperature strength.According to the SEM and TEM characterization,nano-AlN and submicron-Al_(2)O_(3) particles are uniformly distributed in the Al matrix.Brinell hardness results indicate that different from the traditional 6061 Al matrix alloy,the aging kinetics of the composite is obviously accelerated by the reinforcement particles.The T6-treated composite exhibits excellent tensile properties at both room temperature and elevated temperature.Especially at 350℃,the T6-treated composite not only has a high yield strength of 121 MPa and ultimate tensile strength of 128 MPa,but also exhibits a large elongation of 11.6%.Different strengthening mechanisms of nano-AlN and submicron-Al_(2)O_(3) particles were also discussed in detail.展开更多
文摘文章以氮化铝(AlN)粉末为基体材料,以氧化钙(CaO)和氧化钇(Y2O3)为烧结助剂,掺杂酸洗处理后的多壁碳纳米管(CNTs)为增韧材料,采用机械球磨后热压烧结的方法制备氮化铝-碳纳米管(AlN-CNTs)复合材料。通过X射线衍射仪(X-ray diffraction,XRD)和扫描电子显微镜(scanning electron microscope,SEM)对AlN-CNTs复合材料的成分结构及微观形貌进行表征,并测试其物理力学性能。研究表明:随着烧结温度的升高,AlN-CNTs复合材料的力学性能也随之提升;在1750℃的烧结温度下,随着碳纳米管质量分数的增加,AlN-CNTs复合材料的抗弯强度和断裂韧性先上升后下降,且当碳纳米管质量分数为1%时复合材料的力学性能最佳。碳纳米管在AlN-CNTs复合材料中的增韧机制主要是碳纳米管的拔出、碳纳米管的桥连和裂纹的偏转。
基金supported by the Key Program of National Natural Science Foundation of China(No.51731007)the National Natural Science Foundation of China(No.52071179)the Fundamental Research Funds for the Central Universities(No.30920021160).
文摘Nano-AlN and submicron-Al_(2)O_(3) particles were simultaneously utilized in a 6061 Al matrix composite to improve the high-temperature strength.According to the SEM and TEM characterization,nano-AlN and submicron-Al_(2)O_(3) particles are uniformly distributed in the Al matrix.Brinell hardness results indicate that different from the traditional 6061 Al matrix alloy,the aging kinetics of the composite is obviously accelerated by the reinforcement particles.The T6-treated composite exhibits excellent tensile properties at both room temperature and elevated temperature.Especially at 350℃,the T6-treated composite not only has a high yield strength of 121 MPa and ultimate tensile strength of 128 MPa,but also exhibits a large elongation of 11.6%.Different strengthening mechanisms of nano-AlN and submicron-Al_(2)O_(3) particles were also discussed in detail.
