Effects of sulfur and tin contents on hardness of copper-tin alloy under reduced atmosphere in sintering process

Sintered materials are commonly used in industrial equipment, including bearing components. These materials include bimetals consisting of steel backed sintered bronze lined bushings. In particular, 90Cu-10Sn (mass%) bronze is widely used in bearing components. Lead bronze, in which the lead serves...

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Autores principales:	Tomohiro SATO, Yoshimasa HIRAI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2016
Materias:	cu alloy cu-sn system sintering atmosphere powder metallurgy sulfides hardness Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/df9b972e10fa46118bb2f888cae51043
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spelling	oai:doaj.org-article:df9b972e10fa46118bb2f888cae510432021-11-26T06:35:12ZEffects of sulfur and tin contents on hardness of copper-tin alloy under reduced atmosphere in sintering process2187-974510.1299/mej.15-00704https://doaj.org/article/df9b972e10fa46118bb2f888cae510432016-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/3/1/3_15-00704/_pdf/-char/enhttps://doaj.org/toc/2187-9745Sintered materials are commonly used in industrial equipment, including bearing components. These materials include bimetals consisting of steel backed sintered bronze lined bushings. In particular, 90Cu-10Sn (mass%) bronze is widely used in bearing components. Lead bronze, in which the lead serves as a solid lubricant, is being replaced with other materials, among which are sulfide-dispersed bronzes. In sulfide-dispersed bronze, sulfides instead of lead play the role of solid lubricant. However, the sulfides in the bronze may be subject to chemical reduction during sintering, especially when this is carried out under a reducing atmosphere containing hydrogen gas. In this study, we investigate the effect of the sulfides on the bronze, with a focus on the hardness of the bronze matrix and the reaction between sulfides and hydrogen gas. Water-atomized powders were prepared for comparison of the sintering behavior. The sintering temperature in the tests was 1123 K. From the phase diagram of the Cu-Sn system, the liquid phase starts to form into bronze containing 20 mass% Sn at approximately 1123 K; thus, some conditions undergo liquid-phase sintering. Sulfides are observed to disappear from sintered bronze surfaces under a reducing atmosphere. However, the sulfides that are not in a solid solution do not affect the hardness of the bronze matrix, which does, however, depend on the tin content.Tomohiro SATOYoshimasa HIRAIThe Japan Society of Mechanical Engineersarticlecu alloycu-sn systemsintering atmospherepowder metallurgysulfideshardnessMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 3, Iss 1, Pp 15-00704-15-00704 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	cu alloy cu-sn system sintering atmosphere powder metallurgy sulfides hardness Mechanical engineering and machinery TJ1-1570
spellingShingle	cu alloy cu-sn system sintering atmosphere powder metallurgy sulfides hardness Mechanical engineering and machinery TJ1-1570 Tomohiro SATO Yoshimasa HIRAI Effects of sulfur and tin contents on hardness of copper-tin alloy under reduced atmosphere in sintering process
description	Sintered materials are commonly used in industrial equipment, including bearing components. These materials include bimetals consisting of steel backed sintered bronze lined bushings. In particular, 90Cu-10Sn (mass%) bronze is widely used in bearing components. Lead bronze, in which the lead serves as a solid lubricant, is being replaced with other materials, among which are sulfide-dispersed bronzes. In sulfide-dispersed bronze, sulfides instead of lead play the role of solid lubricant. However, the sulfides in the bronze may be subject to chemical reduction during sintering, especially when this is carried out under a reducing atmosphere containing hydrogen gas. In this study, we investigate the effect of the sulfides on the bronze, with a focus on the hardness of the bronze matrix and the reaction between sulfides and hydrogen gas. Water-atomized powders were prepared for comparison of the sintering behavior. The sintering temperature in the tests was 1123 K. From the phase diagram of the Cu-Sn system, the liquid phase starts to form into bronze containing 20 mass% Sn at approximately 1123 K; thus, some conditions undergo liquid-phase sintering. Sulfides are observed to disappear from sintered bronze surfaces under a reducing atmosphere. However, the sulfides that are not in a solid solution do not affect the hardness of the bronze matrix, which does, however, depend on the tin content.
format	article
author	Tomohiro SATO Yoshimasa HIRAI
author_facet	Tomohiro SATO Yoshimasa HIRAI
author_sort	Tomohiro SATO
title	Effects of sulfur and tin contents on hardness of copper-tin alloy under reduced atmosphere in sintering process
title_short	Effects of sulfur and tin contents on hardness of copper-tin alloy under reduced atmosphere in sintering process
title_full	Effects of sulfur and tin contents on hardness of copper-tin alloy under reduced atmosphere in sintering process
title_fullStr	Effects of sulfur and tin contents on hardness of copper-tin alloy under reduced atmosphere in sintering process
title_full_unstemmed	Effects of sulfur and tin contents on hardness of copper-tin alloy under reduced atmosphere in sintering process
title_sort	effects of sulfur and tin contents on hardness of copper-tin alloy under reduced atmosphere in sintering process
publisher	The Japan Society of Mechanical Engineers
publishDate	2016
url	https://doaj.org/article/df9b972e10fa46118bb2f888cae51043
work_keys_str_mv	AT tomohirosato effectsofsulfurandtincontentsonhardnessofcoppertinalloyunderreducedatmosphereinsinteringprocess AT yoshimasahirai effectsofsulfurandtincontentsonhardnessofcoppertinalloyunderreducedatmosphereinsinteringprocess
_version_	1718409812910276608

Effects of sulfur and tin contents on hardness of copper-tin alloy under reduced atmosphere in sintering process

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