Journal ArticleDOI
Influence of Milled Powder Particle Size Distribution on the Microstructure and Electrical Properties of Sintered Mn‐Zn Ferrites
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The grain growth and densification rates of Mn-Zn ferrites during sintering are closely linked to the characteristics of the calcined and milled powders used as mentioned in this paper.Abstract:
The grain growth and densification rates of Mn-Zn ferrites during sintering are closely linked to the characteristics of the calcined and milled powders used. Long milling times enlarge powder particle size distributions and tend to promote discontinuous grain growth during sintering. For fixed sintering conditions, an optimum milling time, which corresponds to minimal eddy current and hysteresis losses, exists. The electrical properties of overmilled powders deteriorate greatly because duplex structure occurs. Theoretical analysis of the probability of discontinuous grain growth occurring during sintering in relation to powder particle size distribution agrees with the experimental results.read more
Citations
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Journal ArticleDOI
Microstructure and normal grain growth in metals and ceramics. Part I. Theory
S. K. Kurtz,F. M. A. Carpay +1 more
TL;DR: In this paper, a detailed statistical theory of normal grain growth has been constructed by extending the theory of Feltham and combining it with the work of Rhines and Craig, and complete solutions are found for the grain growth kinetics of each class, as well as the transfer rates between classes.
Journal ArticleDOI
Effect of Interface Structure on the Microstructural Evolution of Ceramics
TL;DR: In this paper, the authors proposed that the interface atomic structure has a critical effect on the microstructure evolution during sintering of ceramic materials and that the densification process is closely related to the interfaces atomic structure.
Journal ArticleDOI
Ostwald ripening kinetics of angular grains dispersed in a liquid phase by two-dimensional nucleation and abnormal grain growth
TL;DR: In this paper, the coarsening kinetics of angular grains were formulated based on 2-dimensional (2-D) nucleation and solved numerically, which confirmed the general experimental observation that the abnormal grain growth in liquid phase sintering takes place exclusively in the system with angular grains.
Book ChapterDOI
4.1 Sintering of Ceramics
TL;DR: In this article, the basic principles of sintering and how they are applied practically to the production of ceramics with controlled microstructures are discussed, and the key factors are the particle size of the powder and the particle packing in the green body.
Journal ArticleDOI
Effect of SiO2 and TiO2 addition on the exaggerated grain growth of BaTiO3
TL;DR: In this article, the exaggerated grain growth during sintering of BaTiO 3 was studied with two different liquid-forming additive oxides, TiO 2 and SiO 2.
References
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Journal ArticleDOI
Magnetism, microstructure, and crystal chemistry of spinel ferrites
TL;DR: In this article, a comprehensive review of the application of magnetic oxides in the electronics industry is presented, with reference to the theoretical background of such materials existing up to the end of 1967, and the relation of magnetic anisotropy energy and the permeability is discussed in terms of applications to transformers, inductors, etc.
Journal ArticleDOI
Auf welcher Kugel haben 5, 6, 7, 8 oder 9 Punkte mit Mindestabstand Eins Platz ?
TL;DR: DigiZeitschriften e.V. as mentioned in this paper gewährt ein nicht exklusives, nicht übertragbares, persönliches and beschränktes Recht auf Nutzung dieses Dokuments.
Journal ArticleDOI
Modifications to the Zener formula for limitation of grain size
N. A. Haroun,D. W. Budworth +1 more
TL;DR: In this paper, an experimental investigation of the ratio of grain boundary curvature to grain size is reported, from which it is deduced that the terminal grain size determined by inclusions should be about an order of magnitude less than that predicted by the Zener formula in its usual form.
Journal ArticleDOI
Influence des pores et des inclusions sur la croissance des cristaux de ferrite
TL;DR: In this article, the diametre limite of spinel ferrite crystals was determined as a function of their porosity, and the locking of boundaries in the presence of inclusions was discussed.
Journal ArticleDOI
UAl2-AI INSTEAD OF UAl3-AI IN FUEL-ELEMENT PLATES FOR ADVANCED TEST-REACTORS
TL;DR: In this article, a survey of the existing literature on UAl2-Al dispersions is surveyed and a comparison with similar data for UAl3-al dispersions was attempted.