Int. J. of Nanomanufacturing   »   2013 Vol.9, No.3/4

 

 

Title: Influences of nanometre Y2O3 and Yb2O3 additives on structure and properties of α/β-Sialon ceramics prepared by spark plasma sintering

 

Authors: Yucheng Zhao; Wenna Zhang; Qinggang Chen; Mingzhi Wang; Wencan Song; Lei Wang

 

Addresses:
Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004, China
Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004, China
Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004, China
Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004, China
College of Electrical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
Qinhuangdao Institute of Technology, Qinhuangdao, Hebei 066100, China

 

Abstract: Using micrometre α-Si3N4, micrometre AlN, and nanometre Al2O3 powders as starting materials, with nanometre Y2O3, Yb2O3 or Y2O3 + Yb2O3 as sintering additives, multiphase Sialon ceramics were prepared by spark plasma sintering. Influences of different sintering additives on the structure and properties of α/β-Sialon ceramics were discussed in this paper. Sintered specimens were characterised by X-ray diffraction and scanning electron microscopy. Hardness and fracture toughness were determined by Vickers indentation method. The flexural strength was tested by three-point bending method and density was measured by use of Archimedes's principle. The results showed that Yb2O3 additive had more effect on the precipitation of α-Sialon phase than Y2O3, and the flexural strength and fracture toughness of the specimen with Yb2O3 additive were 583.04 MPa and 4.84 MPa.m1/2, respectively.

 

Keywords: alpha-Sialon; beta-Sialon; sintering additives; spark plasma sintering; SPS; yttrium oxide; yttria; nanotechnology; Y2O3; ceramics; hardness; fracture toughness; flexural strength.

 

DOI: 10.1504/IJNM.2013.056065

 

Int. J. of Nanomanufacturing, 2013 Vol.9, No.3/4, pp.387 - 394

 

Submission date: 02 Dec 2012
Date of acceptance: 20 Feb 2013
Available online: 29 Aug 2013

 

 

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