Effect of reinforcement NbC phase on the mechanical properties of Al2O3-NbC nanocomposites obtained by spark plasma sintering

被引：15
作者：
Alecrim, L. R. R. [1 ]
Ferreira, J. A. [1 ]
Gutierrez-Gonzalez, C. F. [2 ]
Salvador, M. D. [3 ]
Borrell, A. [3 ]
Pallone, E. M. J. A. [1 ]
机构：
[1] Univ Sao Paulo, Fac Zootecn & Engn Alimentos, Av Duque Caxias Norte 225, BR-13635900 Pirassununga, SP, Brazil
[2] Univ Oviedo, Ctr Invest Nanomat & Nanotecnol Consejo Super Inv, Avenida Vega 4-6, El Entrego 33940, Spain
[3] Univ Politecn Valencia, ITM, Camino Vera S-N, Valencia 46022, Spain
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2017年 / 64卷
关键词：
Nanocomposite; Al2O3-NbC; Spark plasma sintering; Mechanical properties; Microstructure; BEHAVIOR; CARBIDE;
D O I：
10.1016/j.ijrmhm.2016.10.021
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The sintering behavior of Al2O3-NbC nanocomposites fabricated via conventional and spark plasma sintering (SPS) was investigated. The nanometric powders of NbC were prepared by reactive high-energy milling, deagglomerated, leached with acid, added to the Al2O3 matrix in the proportion of 5 vol% and dried under airflow. Then, the nanocomposite powders were densified at different temperatures, 1450-1600 degrees C. Effect of sintering temperature on the microstructure and mechanical properties such as hardness, toughness and bending strength were analyzed. The Al2O3-NbC nanocomposites obtained by SPS show full density and maximum hardness value >25 GPa and bending strength of 532 MPa at 1500 degrees C. Microstructure observations indicate that NbC nanopartides are dispersed homogeneously within Al2O3 matrix and limit their grain growth. Scanning electron microscopy examination of the fracture surfaces of dense samples obtained at 1600 degrees C by SPS revealed partial melting of the particle surfaces due to the discharge effect. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：255 / 260
页数：6
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