Abstract: This paper studied the heat resistance and high-temperature oxidation resistance of Ni-W gradient deposit with nanostructure. Experiments results indicated that the Ni-W gradient deposit still kept original structure after heat treatment at 400℃, and the hardness of the deposit was as high as Hv 1300,better than the hard Chromium deposit. XRD test shows that the structure of the Ni-W gradient deposit has changed from a displacement solid solution made up of solvent Ni and solute W to a polycrystal structure made up of Ni and W after heat treatment at 600℃. Also, the W content remained the gradient distribution in the deposit. Furthermore, the Ni-W gradient deposit had good high-temperature oxidation resistance, suitable for the high-temperature oxidation circumstances.

Key words:

电沉积, Ni-W非晶态合金, 梯度功能材料, 耐热性, 抗高温氧化性

摘要： 对Ni-W纳米结构梯度镀层进行热处理，结果表明：400 ℃热处理1 h后，镀层结构未发生改变，硬度高达Hv1300，优于硬Cr镀层；600 ℃热处理1 h后，镀层结构由原来的以Ni为溶剂、W为溶质的固溶体转变为存在单一相Ni和W的多晶结构.热处理并未改变Ni-W梯度镀层中W含量的梯度分布.Ni-W纳米结构梯度镀层具有优良的高温氧化性能，可用于高温氧化气氛中.

关键词:

电沉积, Ni-W非晶态合金, 梯度功能材料, 耐热性, 抗高温氧化性