摘要
为使阻燃涂层早日在我国航空发动机上得到应用,在提高涂层阻燃性能的同时,研究涂层对基体力学性能的影响十分必要。文中采用微弧离子表面改性技术在TC11钛合金基体上制备阻燃涂层,研究阻燃涂层对钛合金拉伸性能、压缩性能、蠕变性能及裂纹扩展速率的影响。结果表明,采用微弧离子表面改性技术在TC11基体上制备的阻燃涂层主要由TiC2、W2C及Ti组成,涂层结构致密,与基体结合良好。涂层试样规定非比例延伸强度、抗拉强度以及断面收缩率有轻微降低,降低幅值约为基体抗拉强度5%左右;断后延长率基本无变化,弹性模量随测试温度提高逐步下降,试样抗压强度增大,400℃高温蠕变性能变好,常温裂纹扩展速率降低。综合分析表明,在钛合金基体上制备阻燃涂层后,试样整体力学性能变化幅值小于5%,符合航空发动机部件强度设计要求。
To make an early application of fireresistant coatings in aeroengine, study the effect of coating on substrate mechanics performance is very necessary. In this paper, fireresistant coatings were deposited on TC11 titanium alloys through microarc ion surface modification technology, the effects of the coating on tensile, compression, creep deformation and crack propagation properties have been investigated for the titanium alloy. It is found that the deposited fireresistant coating structure is dense, well bonded to the substrate, and the coating is composed mainly of TiC2, W2C and Ti. The specimens specity that disproportionate elongation strength, tensile strength and reduction of crosssection area are reduced about 5%, the fracture elongation hold the same level with the titanium alloy, Young＇s modulus gradually decreased with increasing test temperatures. Simultaneously, the compression strength increased, the creep deformation at 400℃ and the crack propagation properties at ambient temperature decreased. Namely, after depositing the fireresistant coating on the TC11 titanium alloy, the specimens mechanical properties variation amplitude is less than 5%, in accordance with the requirements of the design strength for aeroengine components.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2014年第1期51-55,共5页
China Surface Engineering
关键词
微弧离子
表面改性
阻燃涂层
TC11钛合金
力学性能
micro- arc ion
surface modification
fire- resistant coating
TC11 titanium alloy
mechanical property
