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Problematika določevanja velikosti delcev finih materialov
Sešelj, Andreja (Author), Stražišar, Janez (Author)

URLURL - Presentation file, Visit http://www.dlib.si/details/URN:NBN:SI:doc-QWAR8T5Q This link opens in a new window

Abstract
Za določevanje velikosti delcev poznamo veliko metod, ki se med seboj razlikujejo po principu določevanja in s tem tudi po dobljenih rezultatih. V zadnjem času je razvoj na tem področju zelo napredoval, tako da lahko danes hitro in rutinsko določujemo velikosti zelo finih delcev, tako z mokrim kot suhim načinom določevanja. Fini delci pa so za merjenje velikosti zelo težavni, saj se s finočo povečuje sposobnost aglomeriranja. Posebej so problematični fini magnetni delci, ker pri teh poleg navadnih privlačnih sil, deluje še magnetna privlačna sila zaradi magnetnih lastnosti, ki jih ti delci imajo in zato imajo še večjo težnjo do nastajanja aglomeratov. Z izbiro različnih materialov z različno specifično magnetno masno susceptibilnostjo ter s primerjavo analiz, narejenih na napravah, ki delujejo po različnih principih smo ugotovili, da lahko s pravilno izbiro pogojev merjenja ter pripravo vzorcev dobimo zelo dobre in ponovljive rezultate.

Language:Slovenian
Keywords:velikost delcev, aglomeracija, magnetizem, fini prahovi, dispergiranje, metode določevanja velikosti delcev
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:NTF - Faculty of Natural Sciences and Engineering
Year:1996
Publisher:Inštitut za kovinske materiale in tehnologije
Number of pages:str. 139-143
Numbering:Letn. 30, št. 1/2
UDC:549.08 : 537.622 : 553
ISSN on article:1318-0010
COBISS.SI-ID:1068636 Link is opened in a new window
Views:479
Downloads:105
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Record is a part of a journal

Title:Kovine zlitine tehnologije
Shortened title:Kovine zlit. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije, ACRONI, Inštitut Josef Stefan, IMPOL, Fakulteta za strojništvo, Slovensko društvo za tribologijo, METAL, TALUM
ISSN:1318-0010
COBISS.SI-ID:31742209 This link opens in a new window

Secondary language

Language:English
Title:Particle size measurement in fine granulation range
Abstract:
Many different methods for size measurement are known and since they differ in their physical principle, also different results are obtained. In recent past, there was a rapid development in new measurement techniques and at the present we can quickly and routine determine particle sizes in the very fine range by wet - as well as dry measurement technique. The smaller particle size, on the other side tends to increase the probability of agglomeration. The measurement of the particle sizes for magnetic materials is not very well understood and in this paper we would like to present our research results regarding the size determination of very fine magnetic materials. Because of their magnetic dipole moment these particles tend to agglomerate even more which in turn causes cartain difficulties during the measurements. Therefore it is important to know under what measurement conditions the actual particle size and not the size of the agglomerates is obtained. By choosing various materials with different specific magnetic susceptibility and by comparison ofthe analyses, carried out in various analyzers operating in different principles, we have found that by correct selection of measuring conditions and sample preparation, we are able to obtain very good results.

Keywords:particle size, agglomeration, magnetism, fini prahovifine powder, dispersion, methods for particle size determination

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