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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Characterization of Si3N4-Al interface after corrosion tests

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Author(s):
C. dos Santos [1] ; S. Ribeiro [2] ; K. Strecker [3] ; C. R. M. da Silva [4]
Total Authors: 4
Affiliation:
[1] FAENQUIL. Departamento de Engenharia de Materiais
[2] FAENQUIL. Departamento de Engenharia de Materiais
[3] FAENQUIL. Departamento de Engenharia de Materiais
[4] Centro Técnico Aeroespacial. AMR. Divisão de Materiais
Total Affiliations: 4
Document type: Journal article
Source: Cerâmica; v. 49, n. 312, p. 223-227, 2003-12-00.
Abstract

Silicon nitride is a covalent ceramic material of high corrosion resistance and mechanical stability at elevated temperatures. Due to these properties, its use in metallurgical processes, such as the casting of alloys, is increasing. Therefore, the characterization of the interface between Si3N4 and the casted metal is of great importance to investigate possible interactions, which might deteriorate the ceramic mould or contaminate the metal. In this work, the use of Si3N4 as crucible material for Al-casting has been studied, by investigating the corrosion attack of liquid Al at a temperature of 1150 ºC during 30 days in air. The interface was characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. It has been found that due to superficial oxidation two oxide layers form - SiO2 on Si3N4 and Al2O3 on Al - which effectively hinder further reactions under the conditions studied, confering high corrosion resistance to the Si3N4 crucible. (AU)