Paper Title:
Reaction Processes and Thermodynamic Modeling for SiAlON Structural Ceramic Powders Synthesized from Nonmetallic Mine
  Abstract

SiAlON family matrix materials have been fabricated from nonmetallic mine. The process of Carbothermal Reduction and Nitridation (CRN) is selected on the basis of raw rocks containing various Si/Al ratios. Thermodynamic analysis of Si-Al-O-N system at different sintering temperatures indicates once the temperature is above 1673 K, a series of chemical reactions occur in sequence, SiO2, SiO, Si2N2O, SiO2+Al2O3, mullite, X-SiAlON, O′-SiAlON, β-SiAlON, SiAlON- polytypiods and Si3N4+AlN. Moreover, most of the reactions are exothermal and are promoted by further heating. The adding or in-situ formed SiC can reduce mullite and Al2O3 to produce O′- or β-SiAlON, and its reaction is surprisingly endothermic and is inhibited when further heated. Also, atmosphere is essential to affect the sintering process. Either raising N2 partial pressures or reducing CO partial pressures can accelerate CRN progress. Correspondingly, phase content and microstructure of the product converted from nonmetallic ore are in detail investigated via X-ray diffraction (XRD) and scanning electron microscopy (SEM).

  Info
Periodical
Key Engineering Materials (Volumes 368-372)
Edited by
Wei Pan and Jianghong Gong
Pages
1564-1567
DOI
10.4028/www.scientific.net/KEM.368-372.1564
Citation
L. H. Xu, X. M. Zhang, F. Lian, Y. P. Di, H. Wang, M. Liu, T. Z. Wang, W. C. Li, "Reaction Processes and Thermodynamic Modeling for SiAlON Structural Ceramic Powders Synthesized from Nonmetallic Mine", Key Engineering Materials, Vols. 368-372, pp. 1564-1567, 2008
Online since
February 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Zafer Tatli, Adem Demir, F. Caliskan
Abstract:SiAlON ceramics were successfully produced in the form of powders from high purity kaolin, a hydrated aluminium silicate, Al2Si2O5(OH)4 type...
169
Authors: Kenneth MacKenzie, G.Vaughan White, Ben Rumsey, Hayley Woolf
Abstract:An important aspect of previous sialon research in NZ has been the development of new synthesis methods, including refinements in...
153
Authors: Ding Peng, Hao Wang, Wei Min Wang, Yu Cheng Wang, Zheng Yi Fu
Abstract:In this paper, a carbothermal reduction and nitridation (CRN) synthesis for cubic aluminum oxynitride (γ-AlON) powders is reported. The CRN...
73
Authors: Jun Bin Wu, Xiang Xin Xue, Tao Jiang
Abstract:With boron-rich slag, silica fume, bauxite chalmette and carbon black as starting materials, -sialon powder was prepared by carbothermal...
1653
Authors: Kai Chen, Zhao Hui Huang, Ming Hao Fang, Yan Gai Liu, Xin Ouyang
Chapter 1: Novel Processing and Manufacturing
Abstract:Ti(C,N) powder was prepared via carbothermal reduction nitridation (CRN) using rutile and carbon black as the raw material. The phase...
32