scholarly journals Preparation of rare earth - transition metal (RE: Y, Tm: Co) intermetallic compounds by calciothermic reduction diffusion process

2014 ◽  
Vol 20 (1) ◽  
pp. 35-40 ◽  
Author(s):  
M. Ilayaraja ◽  
L. John Berchmans ◽  
Sankara Raman Sankaranarayanan
Keyword(s):  
Rare Earth ◽  
Intermetallic Compounds ◽  
Raw Materials ◽  
Argon Atmosphere ◽  
Metallic Cobalt ◽  
Optical Components ◽  
Unreacted Core ◽  
Unreacted Core Model ◽  
Calciothermic Reduction ◽  
Metallic Calcium

Rare earth cobalt alloys have many special magnetic properties and can be used to prepare magnetic and magneto-optical components. The yttrium – cobalt intermetallic compounds are prepared by calciothermic reduction – diffusion (CRD) process at temperature of 1000ºC, under argon atmosphere. Yttrium oxide, metallic cobalt powder, metallic calcium are used as raw materials in this process. Calcium acts as the reductant, which is used to prepare the YCo5 magnetic material. XRD, SEM, EDAX and some thermodynamic valuation have been carried out on the products. The chemical reactions controlled by unreacted core model theory were studied.

scholarly journals Calciothermic powders of rare metals and intermetallic compounds

2020 ◽  
pp. 31-50
Author(s):  
A. V. Kasimtsev ◽  
S. N. Yudin ◽  
Yu. V. Levinsky
Keyword(s):  
Composite Materials ◽  
Intermetallic Compounds ◽  
Raw Materials ◽  
Synthesis Method ◽  
Reduction Process ◽  
Calcium Carbide ◽  
Calcium Hydride ◽  
Rare Metals ◽  
Technical Literature ◽  
Calciothermic Reduction

This paper presents a profound review of scientific and technical literature on the issues of calciothermic production of powders of rare metals, intermetallic compounds, composite materials and refractory oxygen-free compounds (carbides, nitrides). Calciothermic reduction is a metallothermic synthesis method for those substances where calcium or its derivatives, such as calcium hydride or calcium carbide, are used as a reducing agent. Thermodynamics aspects of a reduction process are covered in the paper broadly, with particular emphasis on assessing the reduction depth of original oxide raw materials, as TiO2. The mechanism and kinetics of calciothermic synthesis of single-component and multi-component alloys are described. Presented are both technological means of obtaining materials and hardware resources of many varieties of calciothermic method. The key features of the work are generalization and systematization of properties (chemical, physical, technological) of materials synthesized by calciothermic method. The data are accumulated in the appropriate tables and divided by substance classes (powders of metals and alloys, powders of intermetallic compounds, powders of carbides, powders of nitrides, and powders of composite materials). Methods of calciothermic powder making in case of the singlecomponent and complex multi-component systems are briefly described. This work will be interesting to the students of metallurgical profile and specialists whose scientific interests are in the field of material synthesis by methods of powder metallurgy.

Oxidation and reduction characteristics of oxygen carrier particles and reaction kinetics by unreacted core model

2001 ◽  
Vol 18 (6) ◽  
pp. 831-837 ◽  
Author(s):  
Ho-Jung Ryu ◽  
Dal-Hee Bae ◽  
Keun-Hee Han ◽  
Seung-Yong Lee ◽  
Gyoung-Tae Jin ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Oxygen Carrier ◽  
Core Model ◽  
Unreacted Core ◽  
Unreacted Core Model ◽  
Reduction Characteristics

Nitrogen storage properties based on nitrogenation and hydrogenation of rare earth–iron intermetallic compounds R2Fe17 (R=Y, Ce, Sm)

1999 ◽  
Vol 288 (1-2) ◽  
pp. 141-146 ◽  
Author(s):  
Masahiro Itoh ◽  
Ken-ichi Machida ◽  
Hiroharu Nakajima ◽  
Kazuhiro Hirose ◽  
Gin-ya Adachi
Keyword(s):  
Rare Earth ◽  
Intermetallic Compounds ◽  
Nitrogen Storage ◽  
Iron Intermetallic ◽  
Storage Properties

La9Sb16Br3 and Ce9Sb16Cl3: Stars and Stripes in Rare Earth Halide and Intermetallic Compounds.

ChemInform ◽  
2005 ◽  
Vol 36 (32) ◽  
Author(s):  
Chong Zheng ◽  
Hansjuergen Mattausch ◽  
Arndt Simon
Keyword(s):  
Rare Earth ◽  
Intermetallic Compounds

ChemInform Abstract: Crystal-Field Interactions and Magnetism in Rare-Earth Transition-Metal Intermetallic Compounds

ChemInform ◽  
2010 ◽  
Vol 33 (52) ◽  
pp. no-no
Author(s):  
R. J. Radwanski ◽  
R. Michalski ◽  
Z. Ropka ◽  
A. Blaut
Keyword(s):  
Rare Earth ◽  
Transition Metal ◽  
Intermetallic Compounds ◽  
Crystal Field

Kinetic Study on the Coagula Formation Reactions Using an Extended Unreacted Core Model

2007 ◽  
Vol 40 (6) ◽  
pp. 473-479 ◽  
Author(s):  
Tomoyuki Yoshimi ◽  
Naoki Furukawa ◽  
Kouichi Miura
Keyword(s):  
Kinetic Study ◽  
Core Model ◽  
Unreacted Core ◽  
Unreacted Core Model
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