Studies on electroless nickel boride coating on boron carbide particles

被引：6

作者：

Deepa, J. P. ^{[1
]}

Rajan, T. P. D. ^{[1
]}

Pavithran, C. ^{[1
]}

Pai, B. C. ^{[1
]}

机构：

[1] CSIR, Natl Inst Interdisciplinary Sci & Technol, Mat Sci & Technol Div, Trivandrum 695019, Kerala, India

来源：

SURFACE ENGINEERING | 2014年 / 30卷 / 10期

关键词：

Nickel boride; Electroless coating; Boron carbide; Amorphous coating; Phase transformation; Sodium borohydride; MECHANICAL-PROPERTIES; COMPOSITES; PARAMETERS; MORPHOLOGY; COPPER;

D O I：

10.1179/1743294414Y.0000000279

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Ni-B alloy deposits were successfully formed over alkali surface treated boron carbide by electroless technique and the effects of processing parameters such as reduction bath pH, temperature and post-heat treatment were investigated. Microstructural studies show remarkable changes in structural morphology from mesh-like structure to platelet type Ni-B coating. The main Ni-B phases observed were NiB, Ni2B, Ni3B and Ni4B3. An effective Ni-B alloy coating with better surface characteristics was formed at pH 8 under 75 degrees C reaction bath temperature in the presence of bath stabiliser. The post-heat treatment of Ni-B coated particles under varying bath reaction temperatures at 400 degrees C showed remarkable Ni-B phase transformation from metastable NiB and Ni2B to stable crystalline Ni3B phase. The NiB coated particle shows lower particle-matrix interfacial reaction, better wettability and enhanced dispersion in aluminium composites compared to uncoated particles.

引用

页码：702 / 708

页数：7

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