The kinetics of oxidation of Nd-Fe-B powders
The kinetics of oxidation of 2.5 mu m Nd-Fe-B powder are studied at temperatures 20, 80, 100 and 115 degrees C. The powdered alloy compromises 62.5 wt.% Fe, 35 wt.% Nd and 1.3 wt.% B. The percentage of weight gain is measured and compared with X-ray spectra recorded after various periods of oxidatio...
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| Veröffentlicht in: | IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) 1993-11, Vol.29 (6), p.2782-2784 |
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| container_title | IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) |
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| creator | Turek, K. Liszkowski, P. Figiel, H. |
| description | The kinetics of oxidation of 2.5 mu m Nd-Fe-B powder are studied at temperatures 20, 80, 100 and 115 degrees C. The powdered alloy compromises 62.5 wt.% Fe, 35 wt.% Nd and 1.3 wt.% B. The percentage of weight gain is measured and compared with X-ray spectra recorded after various periods of oxidation. Two stages of oxidation, with powder-like and exponential weight gain reaching a plateau, are distinguished at all temperatures. The effect of changes in phase composition on ferromagnetic properties due to oxidation are examined by a magnetic balance. On the basis of reported measurements, it is concluded that two processes contribute to oxidation of Nd-Fe-B in air, i.e., relatively quick, total oxidation of intergranular Nd and oxidation of Nd/sub 2/Fe/sub 14/B ( Phi ) which stops at 12% level. The recognition of three products of the oxidation at X-ray spectra, Nd/sub 2/O/sub 3/, NdFeO/sub 3/ and Fe/sub 3/O/sub 4/, makes it possible to deduce a final phase composition.< > |
| doi_str_mv | 10.1109/20.281027 |
| format | Article |
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The powdered alloy compromises 62.5 wt.% Fe, 35 wt.% Nd and 1.3 wt.% B. The percentage of weight gain is measured and compared with X-ray spectra recorded after various periods of oxidation. Two stages of oxidation, with powder-like and exponential weight gain reaching a plateau, are distinguished at all temperatures. The effect of changes in phase composition on ferromagnetic properties due to oxidation are examined by a magnetic balance. On the basis of reported measurements, it is concluded that two processes contribute to oxidation of Nd-Fe-B in air, i.e., relatively quick, total oxidation of intergranular Nd and oxidation of Nd/sub 2/Fe/sub 14/B ( Phi ) which stops at 12% level. The recognition of three products of the oxidation at X-ray spectra, Nd/sub 2/O/sub 3/, NdFeO/sub 3/ and Fe/sub 3/O/sub 4/, makes it possible to deduce a final phase composition.< ></description><identifier>ISSN: 0018-9464</identifier><identifier>EISSN: 1941-0069</identifier><identifier>DOI: 10.1109/20.281027</identifier><identifier>CODEN: IEMGAQ</identifier><language>eng</language><publisher>New York, NY: IEEE</publisher><subject>360104 - Metals & Alloys- Physical Properties ; 360105 - Metals & Alloys- Corrosion & Erosion ; Aging ; ALLOYS ; Applied sciences ; BORON ALLOYS ; CHALCOGENIDES ; CHEMICAL REACTIONS ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; Corrosion ; CORROSION PRODUCTS ; DATA ; Exact sciences and technology ; EXPERIMENTAL DATA ; Fe and its alloys ; Grain size ; INFORMATION ; IRON ALLOYS ; IRON COMPOUNDS ; IRON OXIDES ; Kinetic theory ; MAGNETIC PROPERTIES ; Magnetic properties and materials ; Magnetization ; MATERIALS SCIENCE ; Metals. Metallurgy ; Neodymium ; NEODYMIUM ALLOYS ; NEODYMIUM COMPOUNDS ; NEODYMIUM OXIDES ; NUMERICAL DATA ; OXIDATION ; OXIDES ; OXYGEN COMPOUNDS ; PHYSICAL PROPERTIES ; Physics ; Powders ; RARE EARTH ALLOYS ; RARE EARTH COMPOUNDS ; Studies of specific magnetic materials ; Temperature ; TRANSITION ELEMENT COMPOUNDS</subject><ispartof>IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States), 1993-11, Vol.29 (6), p.2782-2784</ispartof><rights>1994 INIST-CNRS</rights><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c364t-a93cb51e538d7477bb540336d970894edb7b7e765f6abbc1353e81fc81aa1e053</citedby><cites>FETCH-LOGICAL-c364t-a93cb51e538d7477bb540336d970894edb7b7e765f6abbc1353e81fc81aa1e053</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/281027$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>230,309,310,314,776,780,785,786,792,881,23910,23911,25119,27903,27904,54737</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/281027$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=4195600$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/7183350$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Turek, K.</creatorcontrib><creatorcontrib>Liszkowski, P.</creatorcontrib><creatorcontrib>Figiel, H.</creatorcontrib><title>The kinetics of oxidation of Nd-Fe-B powders</title><title>IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)</title><addtitle>TMAG</addtitle><description>The kinetics of oxidation of 2.5 mu m Nd-Fe-B powder are studied at temperatures 20, 80, 100 and 115 degrees C. The powdered alloy compromises 62.5 wt.% Fe, 35 wt.% Nd and 1.3 wt.% B. The percentage of weight gain is measured and compared with X-ray spectra recorded after various periods of oxidation. Two stages of oxidation, with powder-like and exponential weight gain reaching a plateau, are distinguished at all temperatures. The effect of changes in phase composition on ferromagnetic properties due to oxidation are examined by a magnetic balance. On the basis of reported measurements, it is concluded that two processes contribute to oxidation of Nd-Fe-B in air, i.e., relatively quick, total oxidation of intergranular Nd and oxidation of Nd/sub 2/Fe/sub 14/B ( Phi ) which stops at 12% level. The recognition of three products of the oxidation at X-ray spectra, Nd/sub 2/O/sub 3/, NdFeO/sub 3/ and Fe/sub 3/O/sub 4/, makes it possible to deduce a final phase composition.< ></description><subject>360104 - Metals & Alloys- Physical Properties</subject><subject>360105 - Metals & Alloys- Corrosion & Erosion</subject><subject>Aging</subject><subject>ALLOYS</subject><subject>Applied sciences</subject><subject>BORON ALLOYS</subject><subject>CHALCOGENIDES</subject><subject>CHEMICAL REACTIONS</subject><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Corrosion</subject><subject>CORROSION PRODUCTS</subject><subject>DATA</subject><subject>Exact sciences and technology</subject><subject>EXPERIMENTAL DATA</subject><subject>Fe and its alloys</subject><subject>Grain size</subject><subject>INFORMATION</subject><subject>IRON ALLOYS</subject><subject>IRON COMPOUNDS</subject><subject>IRON OXIDES</subject><subject>Kinetic theory</subject><subject>MAGNETIC PROPERTIES</subject><subject>Magnetic properties and materials</subject><subject>Magnetization</subject><subject>MATERIALS SCIENCE</subject><subject>Metals. Metallurgy</subject><subject>Neodymium</subject><subject>NEODYMIUM ALLOYS</subject><subject>NEODYMIUM COMPOUNDS</subject><subject>NEODYMIUM OXIDES</subject><subject>NUMERICAL DATA</subject><subject>OXIDATION</subject><subject>OXIDES</subject><subject>OXYGEN COMPOUNDS</subject><subject>PHYSICAL PROPERTIES</subject><subject>Physics</subject><subject>Powders</subject><subject>RARE EARTH ALLOYS</subject><subject>RARE EARTH COMPOUNDS</subject><subject>Studies of specific magnetic materials</subject><subject>Temperature</subject><subject>TRANSITION ELEMENT COMPOUNDS</subject><issn>0018-9464</issn><issn>1941-0069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1993</creationdate><recordtype>article</recordtype><recordid>eNqNkE1Lw0AQhhdRsFYPXj0FEUEwdSf7maMWq0LRSz0vm82ErqbZmk1R_70pKT17Gl7mmYfhJeQc6ASA5ncZnWQaaKYOyAhyDimlMj8kI0pBpzmX_JicxPjRRy6AjsjtYonJp2-w8y4moUrCjy9t50OzDa9lOsP0IVmH7xLbeEqOKltHPNvNMXmfPS6mz-n87ellej9PHZO8S23OXCEABdOl4koVheCUMVnmiuqcY1moQqGSopK2KBwwwVBD5TRYC0gFG5PLwRti5010vkO3dKFp0HVGgWZM0B66HqB1G742GDuz8tFhXdsGwyaaTGvJtM7-AUoBGVM9eDOArg0xtliZdetXtv01QM22XZNRM7Tbs1c7qY3O1lVrG-fj_oBDLiTdPnkxYB4R99ud4w-iin3F</recordid><startdate>19931101</startdate><enddate>19931101</enddate><creator>Turek, K.</creator><creator>Liszkowski, P.</creator><creator>Figiel, H.</creator><general>IEEE</general><general>Institute of Electrical and Electronics Engineers</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>8FD</scope><scope>L7M</scope><scope>8BQ</scope><scope>JG9</scope><scope>OTOTI</scope></search><sort><creationdate>19931101</creationdate><title>The kinetics of oxidation of Nd-Fe-B powders</title><author>Turek, K. ; Liszkowski, P. ; Figiel, H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c364t-a93cb51e538d7477bb540336d970894edb7b7e765f6abbc1353e81fc81aa1e053</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1993</creationdate><topic>360104 - Metals & Alloys- Physical Properties</topic><topic>360105 - Metals & Alloys- Corrosion & Erosion</topic><topic>Aging</topic><topic>ALLOYS</topic><topic>Applied sciences</topic><topic>BORON ALLOYS</topic><topic>CHALCOGENIDES</topic><topic>CHEMICAL REACTIONS</topic><topic>Condensed matter: electronic structure, electrical, magnetic, and optical properties</topic><topic>Corrosion</topic><topic>CORROSION PRODUCTS</topic><topic>DATA</topic><topic>Exact sciences and technology</topic><topic>EXPERIMENTAL DATA</topic><topic>Fe and its alloys</topic><topic>Grain size</topic><topic>INFORMATION</topic><topic>IRON ALLOYS</topic><topic>IRON COMPOUNDS</topic><topic>IRON OXIDES</topic><topic>Kinetic theory</topic><topic>MAGNETIC PROPERTIES</topic><topic>Magnetic properties and materials</topic><topic>Magnetization</topic><topic>MATERIALS SCIENCE</topic><topic>Metals. Metallurgy</topic><topic>Neodymium</topic><topic>NEODYMIUM ALLOYS</topic><topic>NEODYMIUM COMPOUNDS</topic><topic>NEODYMIUM OXIDES</topic><topic>NUMERICAL DATA</topic><topic>OXIDATION</topic><topic>OXIDES</topic><topic>OXYGEN COMPOUNDS</topic><topic>PHYSICAL PROPERTIES</topic><topic>Physics</topic><topic>Powders</topic><topic>RARE EARTH ALLOYS</topic><topic>RARE EARTH COMPOUNDS</topic><topic>Studies of specific magnetic materials</topic><topic>Temperature</topic><topic>TRANSITION ELEMENT COMPOUNDS</topic><toplevel>online_resources</toplevel><creatorcontrib>Turek, K.</creatorcontrib><creatorcontrib>Liszkowski, P.</creatorcontrib><creatorcontrib>Figiel, H.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>METADEX</collection><collection>Materials Research Database</collection><collection>OSTI.GOV</collection><jtitle>IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Turek, K.</au><au>Liszkowski, P.</au><au>Figiel, H.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The kinetics of oxidation of Nd-Fe-B powders</atitle><jtitle>IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)</jtitle><stitle>TMAG</stitle><date>1993-11-01</date><risdate>1993</risdate><volume>29</volume><issue>6</issue><spage>2782</spage><epage>2784</epage><pages>2782-2784</pages><issn>0018-9464</issn><eissn>1941-0069</eissn><coden>IEMGAQ</coden><abstract>The kinetics of oxidation of 2.5 mu m Nd-Fe-B powder are studied at temperatures 20, 80, 100 and 115 degrees C. The powdered alloy compromises 62.5 wt.% Fe, 35 wt.% Nd and 1.3 wt.% B. The percentage of weight gain is measured and compared with X-ray spectra recorded after various periods of oxidation. Two stages of oxidation, with powder-like and exponential weight gain reaching a plateau, are distinguished at all temperatures. The effect of changes in phase composition on ferromagnetic properties due to oxidation are examined by a magnetic balance. On the basis of reported measurements, it is concluded that two processes contribute to oxidation of Nd-Fe-B in air, i.e., relatively quick, total oxidation of intergranular Nd and oxidation of Nd/sub 2/Fe/sub 14/B ( Phi ) which stops at 12% level. The recognition of three products of the oxidation at X-ray spectra, Nd/sub 2/O/sub 3/, NdFeO/sub 3/ and Fe/sub 3/O/sub 4/, makes it possible to deduce a final phase composition.< ></abstract><cop>New York, NY</cop><pub>IEEE</pub><doi>10.1109/20.281027</doi><tpages>3</tpages></addata></record> |
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| issn | 0018-9464 1941-0069 |
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| subjects | 360104 - Metals & Alloys- Physical Properties 360105 - Metals & Alloys- Corrosion & Erosion Aging ALLOYS Applied sciences BORON ALLOYS CHALCOGENIDES CHEMICAL REACTIONS Condensed matter: electronic structure, electrical, magnetic, and optical properties Corrosion CORROSION PRODUCTS DATA Exact sciences and technology EXPERIMENTAL DATA Fe and its alloys Grain size INFORMATION IRON ALLOYS IRON COMPOUNDS IRON OXIDES Kinetic theory MAGNETIC PROPERTIES Magnetic properties and materials Magnetization MATERIALS SCIENCE Metals. Metallurgy Neodymium NEODYMIUM ALLOYS NEODYMIUM COMPOUNDS NEODYMIUM OXIDES NUMERICAL DATA OXIDATION OXIDES OXYGEN COMPOUNDS PHYSICAL PROPERTIES Physics Powders RARE EARTH ALLOYS RARE EARTH COMPOUNDS Studies of specific magnetic materials Temperature TRANSITION ELEMENT COMPOUNDS |
| title | The kinetics of oxidation of Nd-Fe-B powders |
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