非晶涂层中的残余应力及其对涂层性能的影响

项目名称： 非晶涂层中的残余应力及其对涂层性能的影响

项目编号： No.51271081

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 柳林

作者单位： 华中科技大学

项目金额： 80万元

中文摘要： 块体非晶合金是近年来发展起来的新型亚稳材料，但其本征室温脆性严重制约了它们的应用范围。非晶涂层可以克服块体非晶合金这一弊端，其优异的防腐耐磨性能在表面工程领域具有广阔的应用前景。但残余应力是引起非晶涂层服役失效的主要原因，而针对非晶涂层中的残余应力及其对涂层性能的影响的研究仍十分欠缺。 本项目将以Fe基非晶涂层为对象，系统研究超音速热喷涂（HVOF）工艺对残余应力，以及残余应力对涂层性能及失效行为的影响。主要内容包括：1）非晶涂层中残余应力的测量及其影响因素；2）残余应力对非晶涂层性能的影响；3）在残余应力与外加载荷共同作用下非晶涂层的失效机制；4）后处理对非晶涂层残余应力及涂层结构和性能的影响。通过以上研究，揭示非晶涂层中残余应力的形成机理，阐明残余应力对涂层性能的影响规律，这对实现通过残余应力的调控提高非晶涂层的服役性能，促进其在工业各领域的应用具有重要的科学意义和实际意义。

中文关键词： 非晶涂层；残余应力；结合强度；冲击韧性；热喷涂3D打印

英文摘要： Bulk metallic glasses (BMGs) are a novel type of metastable alloys developed in recent years. However, the applications of BMGs as structural materials have been severally blocked by the intrinsic brittleness of this type of alloys. Amorphous coatings based on BMG systems prepared by thermal spraying are recognized to be a promising route to overcome this drawback, and may extend the applications in surface engineering. Like other thermal sprayed coatings, the residual stress existed in the amorphous coatings is one the most important factor causing the failure of the coatings. In the present project, Fe-based amorphous coating will be prepared by high velocity oxy fuel (HVOF) technique, and the residual stress and its effect on structure and properties of the amorphous coatings will be extensively studied with various techniques. The detailed research content include: 1) measurement and affecting factors of residual stress in amorphous coatings ; 2) The effect of residual stress on properties of amorphous coatings; 3) The failure mechanism of amorphous coatings under residual stress coupled with extenal loading; 4) The change in residual stress, structure and properties of amorphous coatings with subsequent annealing treatment. The present project can enhance the understanding of the mechanism of residual stres

英文关键词： Amorphous coating；residual stress；bonding strength；impact toughness；thermal spray 3D printing