东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2008, Vol. 29 ›› Issue (11): 1581-1584.DOI: -

• 论著 • 上一篇    下一篇

铜板上激光熔覆制备Co-Ni-Cu梯度涂层

董江;刘芳;陈岁元;刘常升;   

  1. 东北大学材料各向异性与织构教育部重点实验室;大连交通大学材料学院;
  • 收稿日期:2013-06-22 修回日期:2013-06-22 出版日期:2008-11-15 发布日期:2013-06-22
  • 通讯作者: Dong, J.
  • 作者简介:-
  • 基金资助:
    国家自然科学基金与上海宝钢集团公司联合资助项目(50574020)

Preparation of Co-Ni-Cu gradient coatings by CO2 laser cladding on copperplate

Dong, Jiang (1); Liu, Fang (2); Chen, Sui-Yuan (1); Liu, Chang-Sheng (1)   

  1. (1) Key Laboratory for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110004, China; (2) School of Materials, Dalian Jiaotong University, Dalian 116028, China
  • Received:2013-06-22 Revised:2013-06-22 Online:2008-11-15 Published:2013-06-22
  • Contact: Dong, J.
  • About author:-
  • Supported by:
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摘要： 用10 kW CO2激光器,通过优化激光快速熔覆工艺参数,先在铜合金上制备镍基韧性过渡层,再在其表层采用同步送粉工艺,在上述镍基涂层表面制备了结合良好且组织细小致密、无缺陷的钴基合金涂层,成功制备了Co-Ni-Cu梯度涂层.铜基体-镍基过渡层-钴基工作层的成分、组织和热物理性能呈现梯度分布,使熔覆过程中的热应力被缓解,完全避免了裂纹的产生.M7C3和M23C6型碳化物及钴基固溶体的形成使钴基工作层显微硬度高达655 HV,是铜合金硬度(90 HV)的7.3倍,而且从铜合金基体至镍基过渡层再到钴基工作层,显微硬度也呈梯度平缓增大,因此涂层具有无裂纹、内韧外硬的特性.

关键词: 铜, 激光熔覆, 功能梯度涂层, 镍基合金, 钴基合金

Abstract: A 10 kW CO2 laser was used to prepare the Ni-Cu toughness transition coatings on copper substrate with the fast laser cladding process parameters optimized. Then, a Co-base coating was deposited on the transition coating surface by powder fed for laser cladding to form a Co-Ni-Cu functional gradient coating (FGC) whose microstructure is fine, dense and defect-free. The vertical graded distribution of the composition, structure and thermal properties of the coating composed of 3 layers, i.e., the copper substrate, Ni-base transition layer and Co-base working layer, enables the thermal stress during laser cladding to be relaxed, thus avoiding completely the formation of cracks. The reason is that the formation of M7C3/M23C6 type carbides and Co-base solid solution can provide a maximum microhardness value for Co-base working layer up to 655 HV, about 7.3 times higher than copper substrate (90 HV only). Furthermore, the vertical microhardness distribution of the coating reveals the slow increase in gradient from substrate to top layer. It thus verified that the Co-Ni-Cu coating is crack free and hard on surface with tough at core.

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