Degradation of bending strength occurred by corrosion of sintered silicon nitride in aqueous acidic solutions

Three silicon-nitride (Si3N4) ceramic specimens (differing in terms of sintering additive and bending strength) were corroded and tested in 3-mol/L-HCl aqueous solutions at 80°C for 1500 h. The corrosion resistance of each specimen was evaluated by measuring weight loss and bending strength of the s...

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Autor principal:	Masatsugu ARAI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2018
Materias:	hcl aqueous solution weight loss bending strength corroded layer discolored layer diameter of semi-circular surface cracks fracture toughness (kic) Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/a6196647d6d849d5ac5139c9a2bbc84d
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spelling	oai:doaj.org-article:a6196647d6d849d5ac5139c9a2bbc84d2021-11-26T07:16:02ZDegradation of bending strength occurred by corrosion of sintered silicon nitride in aqueous acidic solutions2187-974510.1299/mej.17-00384https://doaj.org/article/a6196647d6d849d5ac5139c9a2bbc84d2018-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/5/2/5_17-00384/_pdf/-char/enhttps://doaj.org/toc/2187-9745Three silicon-nitride (Si3N4) ceramic specimens (differing in terms of sintering additive and bending strength) were corroded and tested in 3-mol/L-HCl aqueous solutions at 80°C for 1500 h. The corrosion resistance of each specimen was evaluated by measuring weight loss and bending strength of the specimens before and after the immersion tests. The corroded and fractured surfaces of the specimens were observed by SEM. When the specimens were soaked in the aqueous HCl solutions, weight loss and bending strength decreased with immersion time. Moreover, after immersion, the color of a layer in the fractured section (called “discolored layer” hereafter) changed, and the layer became thicker with immersion time. The discolored layer included a corroded layer at the point of contact with the corrosion solution (where grain boundaries were eluted). The correlation between corroded-layer thickness and weight loss and that between bending strength and weight loss were both found to be linear. However, the gradients of those correlations for each test specimen were found to differ, so it is difficult to summarize these correlations with one linear mathematical expression. Measured bending strength and bending strength predicted using fracture toughness (KIC) of the Si3N4-ceramic specimens and crack length were found to be closely related. In this prediction, the corroded-layer thickness of the specimens immersed in HCl solutions was considered to be equivalent to the diameter of semi-circular surface cracks.Masatsugu ARAIThe Japan Society of Mechanical Engineersarticlehcl aqueous solutionweight lossbending strengthcorroded layerdiscolored layerdiameter of semi-circular surface cracksfracture toughness (kic)Mechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 5, Iss 2, Pp 17-00384-17-00384 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	hcl aqueous solution weight loss bending strength corroded layer discolored layer diameter of semi-circular surface cracks fracture toughness (kic) Mechanical engineering and machinery TJ1-1570
spellingShingle	hcl aqueous solution weight loss bending strength corroded layer discolored layer diameter of semi-circular surface cracks fracture toughness (kic) Mechanical engineering and machinery TJ1-1570 Masatsugu ARAI Degradation of bending strength occurred by corrosion of sintered silicon nitride in aqueous acidic solutions
description	Three silicon-nitride (Si3N4) ceramic specimens (differing in terms of sintering additive and bending strength) were corroded and tested in 3-mol/L-HCl aqueous solutions at 80°C for 1500 h. The corrosion resistance of each specimen was evaluated by measuring weight loss and bending strength of the specimens before and after the immersion tests. The corroded and fractured surfaces of the specimens were observed by SEM. When the specimens were soaked in the aqueous HCl solutions, weight loss and bending strength decreased with immersion time. Moreover, after immersion, the color of a layer in the fractured section (called “discolored layer” hereafter) changed, and the layer became thicker with immersion time. The discolored layer included a corroded layer at the point of contact with the corrosion solution (where grain boundaries were eluted). The correlation between corroded-layer thickness and weight loss and that between bending strength and weight loss were both found to be linear. However, the gradients of those correlations for each test specimen were found to differ, so it is difficult to summarize these correlations with one linear mathematical expression. Measured bending strength and bending strength predicted using fracture toughness (KIC) of the Si3N4-ceramic specimens and crack length were found to be closely related. In this prediction, the corroded-layer thickness of the specimens immersed in HCl solutions was considered to be equivalent to the diameter of semi-circular surface cracks.
format	article
author	Masatsugu ARAI
author_facet	Masatsugu ARAI
author_sort	Masatsugu ARAI
title	Degradation of bending strength occurred by corrosion of sintered silicon nitride in aqueous acidic solutions
title_short	Degradation of bending strength occurred by corrosion of sintered silicon nitride in aqueous acidic solutions
title_full	Degradation of bending strength occurred by corrosion of sintered silicon nitride in aqueous acidic solutions
title_fullStr	Degradation of bending strength occurred by corrosion of sintered silicon nitride in aqueous acidic solutions
title_full_unstemmed	Degradation of bending strength occurred by corrosion of sintered silicon nitride in aqueous acidic solutions
title_sort	degradation of bending strength occurred by corrosion of sintered silicon nitride in aqueous acidic solutions
publisher	The Japan Society of Mechanical Engineers
publishDate	2018
url	https://doaj.org/article/a6196647d6d849d5ac5139c9a2bbc84d
work_keys_str_mv	AT masatsuguarai degradationofbendingstrengthoccurredbycorrosionofsinteredsiliconnitrideinaqueousacidicsolutions
_version_	1718409675337105408

Degradation of bending strength occurred by corrosion of sintered silicon nitride in aqueous acidic solutions

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