丁坤英,于建海.含有闭孔的镍基合金涂层压缩过程中的力学性能[J].稀有金属材料与工程,2018,47(1):219~222.[Ding Kunying,Yu Jianhai.Mechanical properties of porous Ni-based Coating during compress process[J].Rare Metal Materials and Engineering,2018,47(1):219~222.]
含有闭孔的镍基合金涂层压缩过程中的力学性能
投稿时间:2015-11-03  修订日期:2016-04-27
中文关键词:  镍基合金  封闭孔洞  弹性模量  弹性变形范围  热膨胀系数
基金项目:国家自然基金资助项目(51501222),天津市应用基础与前沿技术研究计划资助项目(14JCQNJC06800),中央高校基本科研业务费中国民航大学专项资助项目(3122015L001)
中文摘要:
      利用等离子喷涂和重熔技术制备多孔型镍基自熔性合金涂层,采用扫描电镜、显微硬度计、材料试验机、热膨胀仪等设备对涂层的微观组织、热膨胀系数和压缩过程中的力学性能进行分析。结果表明,涂层中存在封闭孔洞,形态近似球形,直径在30-100 μm;孔隙率由0.53%上升至30.6%时,涂层材料的弹性模量下降69.5%,弹性变形范围上升68.7%;在40-220℃的范围内,多孔涂层的平均线膨胀系数随着孔隙率的增加而下降。球形闭孔的存在提升了原有材料的弹性变形范围,降低了热膨胀系数,使其可以实现低膨胀、高回弹的功能。
Mechanical properties of porous Ni-based Coating during compress process
英文关键词:Ni-based alloy  Closed pore  Elasticity moudulus  Elasticity deforming scope  Thermal expansion coefficient
英文摘要:
      A porous Ni-based coating was fabricated by plasma spraying and subsequent remelt method. The microstructure, thermal expansion coefficient and mechanical properties during compress process were analyzed by scanning electron microscope (SEM), micro-hardness tester, thermophysical properties instruments and so on. The results show that the closed and spherical pore with 30-100 μm diameter formed in the remelt coating. The elasticity moudulus of the porous coating descend 69.5% and elasticity deforming scope ascend 68.7% with the porocity ascend to 30.6% from 0.53%. The average linear thermal expansion coefficient increased with the decreasing of porosity in the temperature scope between 40 and 220 ℃. The improvment of elasticity deforming scope of Ni-based alloy due to the formation of closed pore resulted in the decline of thermal expansion coefficient, to achieve the purpose of low thermal expansion and high recoverability.
作者单位E-mail
丁坤英 中国民航大学 理学院 dingkunying@126.com 
于建海 中国民航大学 理学院  
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