摘要
该文采用微弧脉冲离子表面改性技术与高能等离子喷涂工艺制备了具有阻燃特性的TiZrNiCuBe非晶结构改性层和具有隔热特性的YSZ隔热一体化复合功能涂层.研究了该复合功能涂层的阻燃特性、隔热能力、结合强度等关键性能,重点研究了该复合功能涂层对钛合金基体的室温和高温拉伸性能、高温拉伸持久性能、高温拉伸蠕变性能及高周疲劳性能等力学性能的影响.结果表明:采用微弧脉冲离子表面改性技术与高能等离子喷涂工艺制备的TiZrNiCuBe阻燃和YSZ隔热复合功能涂层,与钛合金基体的结合强度较高,达到37.6 MPa;在750℃仍然具有显著的阻燃效果,而未涂敷阻燃隔热复合功能涂层的钛合金在350℃就发生“钛火”燃烧现象;600℃时的隔热温度达到70℃,能满足无人机尾喷管使用要求.TA32钛合金沉积阻燃改性层后,与TA32钛合金相比,室温抗拉强度下降2.7%,550℃高温抗拉强度提高0.9%,550℃/350 MPa高温拉伸持久寿命下降8.5%,550℃/300 MPa高温拉伸蠕变伸长量提高2.5%,高周疲劳寿命下降25%;TA32钛合金沉积阻燃改性层再喷涂隔热涂层制备的阻燃隔热复合功能涂层后,与TA32钛合金相比,室温抗拉强度下降12.9%,550℃高温抗拉强度下降12.7%,550℃/350 MPa高温拉伸持久寿命下降39.7%,550℃/300 MPa高温拉伸蠕变伸长量提高32%,高周疲劳寿命下降24%.因此,采用微弧脉冲离子表面改性技术与高能等离子喷涂工艺制备的TiZrNiCuB阻燃和YSZ隔热复合功能涂层,对于TA32钛合金基体的室温和550℃的抗拉强度影响不大,但对高温拉伸持久、高温拉伸蠕变和高周疲劳性有较大的不利影响,特别是降低了钛合金基体的疲劳性能.
This paper studies the mechanical properties of Ti-alloy substrate coated with combustion-resistant and thermal barrier functional layer,such as the tensile properties at room temperature and 550℃,the stress rupture,the creep,and the high-cycle fatigue.The results indicate that the duplex functional layer with combustion-resistant and thermal barrier has a high bond strength with Ti-alloy substrate up to 37.6 MPa,and heat insulation temperature up to 70℃at 600℃,while did not born below 750℃contrasted with 350℃at which temperature Ti-alloy will born.The results also show that TA32 substrate coated with combustion-resistant layer compare with TA32 sample,the tensile properties at room temperature and 550℃drop to below 3%,the stress rupture life at 550℃/350 MPa fall down 8.5%,the creep elongation at 550℃/300 MPa increase 2.5%,and the high-cycle fatigue cycle times at 500 MPa reduce 25%.The results also show that TA32 coated with the duplex functional layer with combustion-resistant and thermal barrier compare with TA32 sample,the tensile properties at room temperature and 550℃drop to below 13%,the stress rupture life at 550℃/350 MPa fall down 39.7%,the creep elongation at 550℃/300 MPa increase 32%,and the high-cycle fatigue cycle times at 500 MPa reduce 24%.
作者
汪瑞军
马小斌
鲍曼雨
WANG Rui-jun;MA Xiao-bin;BAO Man-yu(BeijingJinlunkuntian Special Machine Co.Ltd.,Beijing 100083;Chinese Academy of Agricultural Mechanization Sciences,Beijing 100083 China)
出处
《湘潭大学学报（自然科学版）》
CAS
2019年第6期27-34,共8页
Journal of Xiangtan University(Natural Science Edition)
关键词
钛合金
阻燃改性层
隔热涂层
力学性能
titanium alloys
combustion-resistant coating
thermal barrier coating
mechanical properties
