Journal ArticleDOI
High coercivity, isotropic plasma sprayed samarium‐cobalt magnets
K. Kumar,D. Das,E. Wettstein +2 more
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TLDR
A 675 kOe value for the room temperature coercivity of an isotropic, heat treated, 1.5 samarium-cobalt plasma sprayed deposit is reported in this article.Abstract:
A value of 675 kOe has been measured for the room temperature coercivity of an isotropic, heat treated, 1‐5 samarium‐cobalt plasma sprayed deposit This value is believed to be the largest published, so far, for a permanent magnet Sprayed magnets are generally found to be better than 93 percent dense with coercivities of 35 to 60 kOe Deposits comprised of fine microstructures yield broad, unresolved x‐ray diffraction peaks Low temperature crystallization of these deposits yields diffraction patterns representative of the high temperature equilibrium structure The emergence of peaks, ascribed to SmCo5, from a low temperature 700 °C heat treatment implies both formation and stability of the SmCo5 phase at this temperature These results dispute the existence of the generally accepted eutectoid decomposition reaction for SmCo5 at 750–800 °C If such a reaction were present the products of crystallization should have included Sm2Co7 and not SmCo5 High temperature investigations on sprayed magnets indicate that temperatures of 1100 °C result in low values of coercivity, possibly due to grain growthread more
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Journal ArticleDOI
RETM5 and RE2TM17 permanent magnets development
TL;DR: In this article, a review of the development of RETM5 and RE2TM17 permanent magnet alloys is presented, including phase diagrams, crystal structures, magnetocrystalline anisotropy, coercivity mechanisms, fabrication technologies, processing-microstructure-property interrelationships, and thermal effects related to them.
Journal ArticleDOI
Thermal Spray Applications in Electronics and Sensors: Past, Present, and Future
TL;DR: In this paper, a review of thermal spray applications in terms of materials functionality from a device perspective, along with ongoing/future concepts addressing the aforementioned deficiencies is presented. The analysis points to intriguing future possibilities for thermal spray technology in the world of thick-film sensors.
Journal ArticleDOI
Mechanically alloyed Sm‐Co materials
TL;DR: In this article, the authors used a high-temperature heat treatment above 800°C followed by a rapid cooling to room temperature for the first time to prepare hard magnetic SmCo5 powder at low temperatures.
Journal ArticleDOI
Structure and magnetic properties of mechanically alloyed SmxCo1-x
TL;DR: In this paper, phase structure and magnetic properties of mechanically alloyed and heat-treated Sm x Co 1−x with x = 0.13 to 0.24 have been carried out.
References
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Journal ArticleDOI
Twenty million energy product samarium-cobalt magnet
TL;DR: In this article, a rare-earth-cobalt magnet with close to the attainable limit of magnetic properties has been developed for PPM stacks of traveling wave tubes, which is based on RCo 5, where R is samarium.
Journal ArticleDOI
Coercive force and stability of SmCo5 and GdCo5
TL;DR: In this paper, at low temperatures the compounds GdCo5 and SmCo5 decompose into the corresponding phases R2Co7 and r2Co17, and the transformation is connected with the dependence of the coercive force of powder compacts on sintering temperature.
Journal ArticleDOI
Phase stability of Co 5 Sm
D. Martin,J. Smeggil +1 more
TL;DR: In this article, diffusion couples formed between cobalt and samarium provide useful structures for studying the Co 5 Sm eutectoid decomposition, and the possible effects of the decomposition on properties of permanent magnets are discussed.
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Relation between coercive force and microstructure of sintered SmCo5 permanent magnets
F. J. A. den Broeder,H. Zijlstra +1 more