摘要
利用 X射线衍射方法研究了不同 Na H2 PO2 的质量浓度以及热处理温度条件下化学镀三元 Ni-Fe-P和四元 Ni-Fe-P-B镀层的结构 .在温度为 2 0 0～ 70 0℃范围内加热镀层产生结构变化 .当热处理温度等于或低于 4 0 0℃时 ,镀层的显微硬度随温度增加 ,这与从 Ni-Fe-P镀层非晶基底中析出( Fe,Ni)固溶体 ,Ni3P相以及从 Ni-Fe-P-B镀层 ( Fe,Ni)固溶体基底中析出Fe2 B等相有关 .热处理温度大于或等于 50 0℃时 ,Ni3P,Fe3P,Fe2 B等相析出 ,同时随温度增加颗粒逐渐粗化 ,引起镀层软化 .在 Ni-Fe-P镀层中加入KBH4,经 3 0 0℃热处理引起镀层显微硬度增加 .低于 3 0 0℃热处理对镀层硬度影响不明显 .该现象可由 B与
The Structure of ternary Ni Fe P and quaternary Ni Fe P B electroless alloy deposits at various sodium hypophosphite concentration and heat treatment temperature are studied by an X ray diffraction analyzer.Heating these deposits from 200 to 700 ℃ produces structural changes.Microhardness of these deposits increased with increasing temperature when heat treatment temperature is 400 ℃ or below,and is shown to be related to the precipitation of (Fe,Ni) from amaorphous matrix of Ni Fe P films and the precipitation of Fe 2B etc phases from (Fe,Ni) solid solution matrix of Ni Fe P B films.When heat treatemt temperature was 500 ℃ or above,Ni 3P,Fe 3P,Fe 2B etc phase precipitated,at the same time the grains were coarsened with increasing temperature,which softened deposits.Adding trace KBH 4 can cause an increment in microbardness after larger than 300 ℃ heat treatment.It's effect not obvious on the hardness lower than 300 ℃ treatment is not obrious.This observation is believed to be correlated with the crystallization phases of B and Ni Fe solid solution matrix.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2001年第6期41-47,共7页
Journal of Hunan University:Natural Sciences
基金
湖南省科委基金资助项目 ( 98P5 6 0 4 4)
