物理化学学报 >> 2002, Vol. 18 >> Issue (11): 1029-1032.doi: 10.3866/PKU.WHXB20021114

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Ni-W纳米结构梯度镀层的制备、表征及热应变特性

王宏智;姚素薇;邢冬梅;张卫国   

  1. 天津大学化工学院应用化学系,天津　300072;天津大学机械工程学院,天津　300072
  • 收稿日期:2002-01-16 修回日期:2002-04-17 发布日期:2002-11-15
  • 通讯作者: 王宏智 E-mail:whzl06@263.net

Preparation, Characterization and the Study of the Thermal Strain of Ni-W Gradient Deposits with Nanostructure

Wang Hong-Zhi;Yao Su-Wei;Xing Dong-Mei;Zhang Wei-Guo   

  1. School of Chemical Engineering and Technology; 1School of Mechanical Engineering, Tianjin University　300072
  • Received:2002-01-16 Revised:2002-04-17 Published:2002-11-15
  • Contact: Wang Hong-Zhi E-mail:whzl06@263.net

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摘要： 采用电沉积方法并调节镀液温度、电流密度等工艺参数制备Ni-W纳米结构梯度镀层.SEM能谱测试及X射线衍射测试表明,沿镀层生长方向,钨含量逐渐增加,晶粒尺寸由10.9 nm递减到1.5 nm,晶格畸变度逐渐增大,镀层由纳米晶逐步过渡到非晶结构.结构呈连续梯度分布.热应变特性研究表明,沿镀层厚度方向,热应变变化平缓,有效地缓解了界面处材料热失配,从而缓和了材料的热应力.

关键词: 电沉积, Ni-W合金, 纳米梯度

Abstract: The Ni-W gradient deposit with nanostructure was prepared by controlling the bath temperature and current density. The plating bath contained sodium tungsten, nickel sulfate and citrate, and the preparation was undertaken at various current densities. X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDX) indicate that crystallite size of the deposit decreases from 10.9nm to 1.5nm and lattice strain increases with the increase of W content in the direction of deposition. The structure of the deposit changes from crystalline to amorphous gradually with associated increase in lattice strain. These show that the deposit is gradient with nanostructure. Furthermore, the strain distribution in the Ni-W gradient deposit studied by the digital-image correlation method can eliminate the mismatch of expansion coefficients at the interface, thus relaxing the thermal stresses of the materials.

Key words: Electrochemical deposition, Ni-W alloy, Nano-gradient