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Statements

Subject Item
n2:RIV%2F61989100%3A27360%2F11%3A86080905%21RIV12-MSM-27360___
rdf:type
n11:Vysledek skos:Concept
dcterms:description
The paper deals with the study of properties of supplied high-energy NdFeB permanent magnets (type N35), equipped with Zn coating to improve their corrosion resistance. Metallographic analysis, the determination of grain size, phase identification using SEM with EDX micro-analyser, measurements of magnetic characteristics and corrosion tests were conducted. Basic matrix phase Nd2Fe14B was identified in the structure of the sample, as well as Nd-rich phase, and structure showed considerable porosity. Furthermore, an oxidic phase Nd(R)0x and Nd(R)xOyFez were found on the grain boundaries and at the point of intersection of three grains. Grain size distribution of the matrix was determined using the software Analysis and it ranged between 10 to 25 m. The measured magnetic characteristics did not entirely correspond to the values indicated by the manufacturer, in particular magnetic product (BH max, which was approx. by 20% lower. Corrosion tests in neutral salt mist performed on five pieces of samples from the magnet N35 were carried out according to the standard ČSN EN ISO 9227 (Method NSS - neutral salt spray test) with an exposure period of 240 hours. The first corrosion products of zinc (rust of coating) occurred in all samples already after 24 hours, which does not meet the requirement for 48 hour exposure without corrosion and the samples from the viewpoint of are unsatisfactory. In three samples first Fe products (corrosion of magnet body) appeared after 240 hours, while the required time of exposition without corrosion was 120 hours. Test results show that the quality of the imported magnets from China may be different. The paper deals with the study of properties of supplied high-energy NdFeB permanent magnets (type N35), equipped with Zn coating to improve their corrosion resistance. Metallographic analysis, the determination of grain size, phase identification using SEM with EDX micro-analyser, measurements of magnetic characteristics and corrosion tests were conducted. Basic matrix phase Nd2Fe14B was identified in the structure of the sample, as well as Nd-rich phase, and structure showed considerable porosity. Furthermore, an oxidic phase Nd(R)0x and Nd(R)xOyFez were found on the grain boundaries and at the point of intersection of three grains. Grain size distribution of the matrix was determined using the software Analysis and it ranged between 10 to 25 m. The measured magnetic characteristics did not entirely correspond to the values indicated by the manufacturer, in particular magnetic product (BH max, which was approx. by 20% lower. Corrosion tests in neutral salt mist performed on five pieces of samples from the magnet N35 were carried out according to the standard ČSN EN ISO 9227 (Method NSS - neutral salt spray test) with an exposure period of 240 hours. The first corrosion products of zinc (rust of coating) occurred in all samples already after 24 hours, which does not meet the requirement for 48 hour exposure without corrosion and the samples from the viewpoint of are unsatisfactory. In three samples first Fe products (corrosion of magnet body) appeared after 240 hours, while the required time of exposition without corrosion was 120 hours. Test results show that the quality of the imported magnets from China may be different.
dcterms:title
Study of properties of high-energy NdFeB permanent magnets Study of properties of high-energy NdFeB permanent magnets
skos:prefLabel
Study of properties of high-energy NdFeB permanent magnets Study of properties of high-energy NdFeB permanent magnets
skos:notation
RIV/61989100:27360/11:86080905!RIV12-MSM-27360___
n11:predkladatel
n12:orjk%3A27360
n4:aktivita
n8:P
n4:aktivity
P(ED0040/01/01)
n4:cisloPeriodika
3
n4:dodaniDat
n10:2012
n4:domaciTvurceVysledku
n13:8504261 n13:6608787
n4:druhVysledku
n5:J
n4:duvernostUdaju
n15:S
n4:entitaPredkladatele
n9:predkladatel
n4:idSjednocenehoVysledku
233103
n4:idVysledku
RIV/61989100:27360/11:86080905
n4:jazykVysledku
n19:eng
n4:klicovaSlova
corrosion properties; magnetic properties; structure; NdFeB magnets
n4:klicoveSlovo
n6:structure n6:NdFeB%20magnets n6:corrosion%20properties n6:magnetic%20properties
n4:kodStatuVydavatele
CZ - Česká republika
n4:kontrolniKodProRIV
[58E799BD4587]
n4:nazevZdroje
Hutnické listy
n4:obor
n16:JG
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
4
n4:projekt
n14:ED0040%2F01%2F01
n4:rokUplatneniVysledku
n10:2011
n4:svazekPeriodika
64
n4:tvurceVysledku
Skotnicová, Kateřina Kursa, Miroslav Matějková, Petra Kursová, Marie
s:issn
0018-8069
s:numberOfPages
7
n18:organizacniJednotka
27360