Effect of powder reactivity on fabrication and properties of NiAl/Al2O3 composite coated on cast iron using spark plasma sintering

被引：22

作者：

Beyhaghi, Maryam ^{[1
]}

Kiani-Rashid, Ali-Reza ^{[1
]}

Kashefi, Mehrdad ^{[1
]}

Khaki, Jalil Vandati ^{[1
]}

Jonsson, Stefan ^{[2
]}

机构：

[1] Ferdowsi Univ Mashhad, Dept Met & Mat Engn, Mashhad 917751111, Iran

[2] Royal Inst Technol, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden

来源：

APPLIED SURFACE SCIENCE | 2015年 / 344卷

关键词：

Coatings; Composites; Mechanical activation; Spark plasma sintering; NiAl; Al2O3; OXIDATION RESISTANCE; TI SUBSTRATE; CARBON-STEEL; NI; COATINGS; LAYER; AL3TI;

D O I：

10.1016/j.apsusc.2015.01.186

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Powder mixtures of Ni, NiO and Al are ball milled for 1 and 10 h. X-ray diffractometry and differential thermal analysis show that while ball milling for 1 h produced mechanically activated powder; 10 h ball milling produced NiAl and Al2O3 phases. Dense NiAl/Al2O3 composite coatings are formed on gray cast iron substrate by spark plasma sintering (SPS) technique. The effect of powder reactivity on microstructure, hardness and scratch hardness of NiAl/Al2O3 coatings after SPS is discussed. Results show that in the coating sample made of mechanically activated powder in situ synthesis of NiAl/Al2O3 composite coating is fulfilled and a thicker well-formed diffusion bond layer at the interface between coating and substrate is observed. The diffusion of elements across the bond layers and phase evolution in the bond layers were investigated. No pores or cracks were observed at the interface between coating layer and substrate in any of samples. Higher Vickers hardness and scratch hardness values in coating made of 10 h ball milled powder than in coating fabricated from 1 h ball milled powder are attributed to better dispersion of Al2O3 reinforcement particles in NiAl matrix and nano-crystalline structure of NiAl matrix. Scratched surface of coatings did not reveal any cracking or spallation at coating-substrate interface indicating their good adherence at test conditions. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：1 / 8

页数：8

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