Nb2O5含量对原位碳热还原法制备的Ti(C,N)基金属陶瓷显微组织和力学性能的影响
Effects of Nb2O5 Content on Microstructures and Mechanical Properties of Ti(C,N)-Based Cermets Fabricated by In-Situ Carbothermal Reduction Method
王旺旺 1杨政凯 1梁海峰 1姜智艺 1郑勇1
作者信息
- 1. 南京航空航天大学材料科学与技术学院,江苏南京 210016
- 折叠
摘要
以原位碳热还原法制备了Ti(C,N)基金属陶瓷,研究了Nb2O5添加量对金属陶瓷显微组织和力学性能的影响规律.结果显示:当添加Nb2O5的质量分数由0增加至2.80%时,金属陶瓷硬质相晶粒明显细化,显微组织中"白芯-灰环"晶粒数量增多;室温抗弯强度、硬度、临界热震温差和高温抗弯强度有所增加,但断裂韧性略微降低.随着Nb2O5的添加量继续增加,金属陶瓷显微组织中出现孔洞,室温抗弯强度、硬度、临界热震温差、高温抗弯强度和断裂韧性均不断下降.当Nb2O5的添加量为2.80%时,金属陶瓷表现出最佳的综合力学性能,其室温抗弯强度、硬度、断裂韧性、临界热震温差和高温抗弯强度分别为:2 439 MPa、90.6HRA、12.8 MPa·m1/2、360℃、1 519 MPa.
Abstract
The in-situ carbothermal reduction method was used to fabricate Ti(C,N)-based cermets,and the effects of Nb2O5 on microstructures and mechanical properties of Ti(C,N)-based cermets were studied.The results indicate that when the content of Nb2O5 increases from 0%to 2.80%,the hard phase grains of the cermets are significantly refined,and the number of"white core/gray rim"grains increases.Moreover,room-temperature transverse rupture strength(TRS),hardness,critical thermal shock temperature difference,and high-temperature TRS increase,while the fracture toughness decreases.As Nb2O5 content rises,there are holes in the microstructure of the cermets,and room-temperature TRS,hardness,critical thermal shock temperature difference,high-temperature TRS,and fracture toughness gradually decrease.The cermets with Nb2O5 content of 2.80%exhibit the best comprehensive mechanical properties,with a room-temperature TRS of 2 439 MPa,a hardness of 90.6HRA,a fracture toughness of 12.8 MPa·m1/2,a critical thermal shock temperature difference of 360℃,and a high-temperature TRS of 1 519 MPa,respectively.
关键词
Ti(C,N)基金属陶瓷/Nb2O5/原位碳热还原/显微组织/力学性能Key words
Ti(C,N)-based cermets/Nb2O5/in-situ carbothermal reduction/microstructures/mechanical properties引用本文复制引用
基金项目
国家自然科学基金(51674148)
国家重点实验室基金(JCKY61420052023)
出版年
2024
NETL
NSTL
万方数据