Development of TbCu7-type Sm-Fe-N anisotropic magnet powder and its sintered magnets
Anisotropic TbCu7-type Sm-Fe-N magnet powder and its sintered magnets were developed using TbCu7-type Sm-Fe alloy powder synthesized by a modified low-temperature reduction diffusion process. Using Sm metal powder instead of SmCl3 and Ca and using the eutectic salt LiCl-CaCl2 to lower the synthesis...
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| Veröffentlicht in: | Journal of alloys and compounds 2022-12, Vol.929, p.167280, Article 167280 |
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| creator | Sato, Suguru Nishikawa, Kenichi Node, Eri Okada, Shusuke |
| description | Anisotropic TbCu7-type Sm-Fe-N magnet powder and its sintered magnets were developed using TbCu7-type Sm-Fe alloy powder synthesized by a modified low-temperature reduction diffusion process. Using Sm metal powder instead of SmCl3 and Ca and using the eutectic salt LiCl-CaCl2 to lower the synthesis temperature, an almost single-phase TbCu7-type Sm-Fe powder was obtained. By nitriding the powder with an NH3-H2 mixture gas, a TbCu7-type Sm-Fe-N anisotropic magnet powder was demonstrated for the first time. Furthermore, by sintering the anisotropic powder with a high-pressure current sintering process, a TbCu7-type Sm-Fe-N anisotropic sintered magnet with a relative density of 86.8% was produced. The magnetization ratio σr/σ90 kOe was decreased by the formation of the α-Fe phase as a result of the decomposition of the TbCu7-type Sm-Fe-N phase in the sintering process, whereas the coercivity was slightly increased. This result indicates that the TbCu7-type Sm-Fe-N magnet is less affected by the existence of α-Fe compared with a Sm2Fe17N3 magnet.
•High-purity metastable TbCu7-type Sm-Fe alloy powder was obtained by a modified low-temperature reduction diffusion process.•By nitriding the obtained powder, TbCu7-type Sm-Fe-N anisotropic magnet powder was demonstrated for the first time.•TbCu7-type Sm-Fe-N anisotropic sintered magnet with a relative density of 86.8% was produced by current sintering. |
| doi_str_mv | 10.1016/j.jallcom.2022.167280 |
| format | Article |
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•High-purity metastable TbCu7-type Sm-Fe alloy powder was obtained by a modified low-temperature reduction diffusion process.•By nitriding the obtained powder, TbCu7-type Sm-Fe-N anisotropic magnet powder was demonstrated for the first time.•TbCu7-type Sm-Fe-N anisotropic sintered magnet with a relative density of 86.8% was produced by current sintering.</description><identifier>ISSN: 0925-8388</identifier><identifier>EISSN: 1873-4669</identifier><identifier>DOI: 10.1016/j.jallcom.2022.167280</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Alloy powders ; Alpha iron ; Ammonia ; Ca reduction diffusion ; Calcium chloride ; Coercivity ; Ferrous alloys ; High-pressure current sintering ; Low temperature ; Magnets ; Meta-stable phase ; Metal powders ; Permanent magnet ; Samarium ; Samarium base alloys ; Sintering ; Sintering (powder metallurgy) ; Sm-Fe-N ; Specific gravity</subject><ispartof>Journal of alloys and compounds, 2022-12, Vol.929, p.167280, Article 167280</ispartof><rights>2022 Elsevier B.V.</rights><rights>Copyright Elsevier BV Dec 25, 2022</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c267t-6a3a06d68e314e71530d733f82220c1125e84270b148684626555fd622cdb3d03</citedby><cites>FETCH-LOGICAL-c267t-6a3a06d68e314e71530d733f82220c1125e84270b148684626555fd622cdb3d03</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.jallcom.2022.167280$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3548,27923,27924,45994</link.rule.ids></links><search><creatorcontrib>Sato, Suguru</creatorcontrib><creatorcontrib>Nishikawa, Kenichi</creatorcontrib><creatorcontrib>Node, Eri</creatorcontrib><creatorcontrib>Okada, Shusuke</creatorcontrib><title>Development of TbCu7-type Sm-Fe-N anisotropic magnet powder and its sintered magnets</title><title>Journal of alloys and compounds</title><description>Anisotropic TbCu7-type Sm-Fe-N magnet powder and its sintered magnets were developed using TbCu7-type Sm-Fe alloy powder synthesized by a modified low-temperature reduction diffusion process. Using Sm metal powder instead of SmCl3 and Ca and using the eutectic salt LiCl-CaCl2 to lower the synthesis temperature, an almost single-phase TbCu7-type Sm-Fe powder was obtained. By nitriding the powder with an NH3-H2 mixture gas, a TbCu7-type Sm-Fe-N anisotropic magnet powder was demonstrated for the first time. Furthermore, by sintering the anisotropic powder with a high-pressure current sintering process, a TbCu7-type Sm-Fe-N anisotropic sintered magnet with a relative density of 86.8% was produced. The magnetization ratio σr/σ90 kOe was decreased by the formation of the α-Fe phase as a result of the decomposition of the TbCu7-type Sm-Fe-N phase in the sintering process, whereas the coercivity was slightly increased. This result indicates that the TbCu7-type Sm-Fe-N magnet is less affected by the existence of α-Fe compared with a Sm2Fe17N3 magnet.
•High-purity metastable TbCu7-type Sm-Fe alloy powder was obtained by a modified low-temperature reduction diffusion process.•By nitriding the obtained powder, TbCu7-type Sm-Fe-N anisotropic magnet powder was demonstrated for the first time.•TbCu7-type Sm-Fe-N anisotropic sintered magnet with a relative density of 86.8% was produced by current sintering.</description><subject>Alloy powders</subject><subject>Alpha iron</subject><subject>Ammonia</subject><subject>Ca reduction diffusion</subject><subject>Calcium chloride</subject><subject>Coercivity</subject><subject>Ferrous alloys</subject><subject>High-pressure current sintering</subject><subject>Low temperature</subject><subject>Magnets</subject><subject>Meta-stable phase</subject><subject>Metal powders</subject><subject>Permanent magnet</subject><subject>Samarium</subject><subject>Samarium base alloys</subject><subject>Sintering</subject><subject>Sintering (powder metallurgy)</subject><subject>Sm-Fe-N</subject><subject>Specific gravity</subject><issn>0925-8388</issn><issn>1873-4669</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNqFkE1LwzAYx4MoOKcfQQh4bs1Lm2QnkelUGHpwnkOXPJWUtqlJNtm3t6O7e3oO_zeeH0K3lOSUUHHf5E3VtsZ3OSOM5VRIpsgZmlEleVYIsThHM7JgZaa4UpfoKsaGEEIXnM7Q5gn20Pqhgz5hX-PNdrmTWToMgD-7bAXZO656F30KfnAGd9V3DwkP_tdCGBWLXYo4uj5BAHuS4zW6qKs2ws3pztHX6nmzfM3WHy9vy8d1ZpiQKRMVr4iwQgGnBUhacmIl57VijBFDKStBFUySLS2UUIVgoizL2grGjN1yS_gc3U29Q_A_O4hJN34X-nFSMylGFoIQPrrKyWWCjzFArYfguiocNCX6CFA3-gRQHwHqCeCYe5hyML6wdxB0NA56A9YFMElb7_5p-AP3-XnY</recordid><startdate>20221225</startdate><enddate>20221225</enddate><creator>Sato, Suguru</creator><creator>Nishikawa, Kenichi</creator><creator>Node, Eri</creator><creator>Okada, Shusuke</creator><general>Elsevier B.V</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20221225</creationdate><title>Development of TbCu7-type Sm-Fe-N anisotropic magnet powder and its sintered magnets</title><author>Sato, Suguru ; Nishikawa, Kenichi ; Node, Eri ; Okada, Shusuke</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c267t-6a3a06d68e314e71530d733f82220c1125e84270b148684626555fd622cdb3d03</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Alloy powders</topic><topic>Alpha iron</topic><topic>Ammonia</topic><topic>Ca reduction diffusion</topic><topic>Calcium chloride</topic><topic>Coercivity</topic><topic>Ferrous alloys</topic><topic>High-pressure current sintering</topic><topic>Low temperature</topic><topic>Magnets</topic><topic>Meta-stable phase</topic><topic>Metal powders</topic><topic>Permanent magnet</topic><topic>Samarium</topic><topic>Samarium base alloys</topic><topic>Sintering</topic><topic>Sintering (powder metallurgy)</topic><topic>Sm-Fe-N</topic><topic>Specific gravity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sato, Suguru</creatorcontrib><creatorcontrib>Nishikawa, Kenichi</creatorcontrib><creatorcontrib>Node, Eri</creatorcontrib><creatorcontrib>Okada, Shusuke</creatorcontrib><collection>CrossRef</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Journal of alloys and compounds</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sato, Suguru</au><au>Nishikawa, Kenichi</au><au>Node, Eri</au><au>Okada, Shusuke</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Development of TbCu7-type Sm-Fe-N anisotropic magnet powder and its sintered magnets</atitle><jtitle>Journal of alloys and compounds</jtitle><date>2022-12-25</date><risdate>2022</risdate><volume>929</volume><spage>167280</spage><pages>167280-</pages><artnum>167280</artnum><issn>0925-8388</issn><eissn>1873-4669</eissn><abstract>Anisotropic TbCu7-type Sm-Fe-N magnet powder and its sintered magnets were developed using TbCu7-type Sm-Fe alloy powder synthesized by a modified low-temperature reduction diffusion process. Using Sm metal powder instead of SmCl3 and Ca and using the eutectic salt LiCl-CaCl2 to lower the synthesis temperature, an almost single-phase TbCu7-type Sm-Fe powder was obtained. By nitriding the powder with an NH3-H2 mixture gas, a TbCu7-type Sm-Fe-N anisotropic magnet powder was demonstrated for the first time. Furthermore, by sintering the anisotropic powder with a high-pressure current sintering process, a TbCu7-type Sm-Fe-N anisotropic sintered magnet with a relative density of 86.8% was produced. The magnetization ratio σr/σ90 kOe was decreased by the formation of the α-Fe phase as a result of the decomposition of the TbCu7-type Sm-Fe-N phase in the sintering process, whereas the coercivity was slightly increased. This result indicates that the TbCu7-type Sm-Fe-N magnet is less affected by the existence of α-Fe compared with a Sm2Fe17N3 magnet.
•High-purity metastable TbCu7-type Sm-Fe alloy powder was obtained by a modified low-temperature reduction diffusion process.•By nitriding the obtained powder, TbCu7-type Sm-Fe-N anisotropic magnet powder was demonstrated for the first time.•TbCu7-type Sm-Fe-N anisotropic sintered magnet with a relative density of 86.8% was produced by current sintering.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jallcom.2022.167280</doi></addata></record> |
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| subjects | Alloy powders Alpha iron Ammonia Ca reduction diffusion Calcium chloride Coercivity Ferrous alloys High-pressure current sintering Low temperature Magnets Meta-stable phase Metal powders Permanent magnet Samarium Samarium base alloys Sintering Sintering (powder metallurgy) Sm-Fe-N Specific gravity |
| title | Development of TbCu7-type Sm-Fe-N anisotropic magnet powder and its sintered magnets |
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