Spark plasma sintering of magnesia-doped alumina with high hardness and fracture toughness

被引：77

作者：

Chakravarty, Dibyendu ^{[1
]}

Bysakh, Sandip ^{[2
]}

Muraleedharan, Kuttanellore ^{[2
]}

Rao, Tata Narasinga ^{[1
]}

Sundaresan, Ranganathan ^{[1
]}

机构：

[1] Int Adv Res Ctr Power Met & New Mat, Hyderabad 500005, Andhra Pradesh, India

[2] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2008年 / 91卷 / 01期

关键词：

D O I：

10.1111/j.1551-2916.2007.02094.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effect of grain size of magnesia and its content as well as spark plasma sintering conditions on the density, grain size, strength, hardness, and toughness of alumina was investigated. Spark plasma sintering conditions were optimized at 1150 degrees C/5 min/175 degrees C/min. Addition of 100 nm magnesia gave higher density levels (99.5%), while better strength (600 MPa), hardness (25 GPa), and fracture toughness (4.5 MPa.m(1/2)) were obtained with 15 nm magnesia. The good strength and hardness is attributed to the submicrometer grain size of the matrix, and the improved toughness to the presence of Mg-rich nanoparticles and nanopores at grain boundaries.

引用

页码：203 / 208

页数：6

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