脉冲电沉积Ni-W-P-SiC复合镀层的硬度研究

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A Research on the Hardness of Pulse Electrodeposited Ni-W-P-SiC Composite Coatings

1. Faculty of Materials Engineering Southwest University of Science and Technology, Mianyang 621002, China;
2. Faculty of Materials & Metallurgical Engineering Kunming University of Science and Technology, Kunming 650093, China

摘要: 研究了脉冲电沉积的Ni W P SiC复合镀层的硬度。研究表明,脉冲频率和占空比对镀层的硬度都有很大的影响。脉冲镀层的硬度基本上比直流镀层的硬度高100~200Hv。热处理温度小于600℃时,镀层的硬度随温度的升高而升高,在600℃达到峰值。在400℃热处理条件下,随着热处理时间的延长,镀层的硬度增加,当热处理时间达到3h时,镀层硬度最高。镀层中的SiC微粒随着温度的升高和时间的延长向基体金属的扩散越来越多。
- 电沉积 /
- 脉冲 /
- Ni-W-P-SiC复合镀层
Abstract: The hardness of pulse electrodeposited Ni-W-P-SiC composite coatings is studied. The results show that both variation in duty ratio and pulse frequency have great influence on the hardness of the deposite. The hardness of the coating deposited by pulse current is 100~200Hv higher than that of by direct current in different conditions. The hardness of the coating will increase with the rising of heating temperature reaching the peak at 600℃ and will decrease sharply as the temperature rises further. The hardness of the coating also increase as heat-treatment time extending and the optimum value is obtained after 3 hours of heating at 400℃. With the rising of heating temperature and the extending of heat-treatment time, more and more SiC particles diffuse from coating to substrate.
- Electrodeposition /
- Pulse /
- Ni-W-P-SiC composite coatings