(华侨大学 材料科学与工程学院 福建省高校功能材料重点实验室，泉州362021)
摘 要:
关键字: Ni-Co-Fe-P合金；化学沉积；热处理；磁性能
（The Key Laboratory for Functional Materials of Fujian Higher Education, College of Materials Science and Engineering,Huaqiao University, Quanzhou 362021, China）
Abstract:Electroless Ni-Co-Fe-P alloys were deposited from a soft alkaline bath, containing boric acid as a buffer agent and sodium citrate as a complexing agent. The effect of the bath pH value on the coating structure was investigated by energy-dispersive X-ray spectral analysis (EDS), scanning electron microscope (SEM) and X-ray diffractrometry (XRD). As a result, with the increase of the bath pH value, the iron and cobalt contents of the deposit increase basically, while the nickel and phosphorus contents decrease. The deposit surface has compact particles，and the particle size increases with the bath pH value. The structure of the deposit is amorphous. The deposit is converted into Fe-Co (Pm3m) phase at 266.9 ℃, and transformed into Ni8P3 (R3C) meta stable phase and Co3Fe7 (Pm3m) phase at 389.6 ℃, and then crystallized into Ni3P (I-4) and Ni (Fm3m) stable phases at 500 ℃. The saturation magnetization and coercivity of the film increase with increasing the heat treatment temperature.
Key words: Ni-Co-Fe-P alloy; electroless deposition; heat treatment; magnetic performance
