scholarly journals Solid State Reaction in Mechanically Alloyed Magnesium with Addition of Low-Melting-Metal Oxides.

2001 ◽  
Vol 48 (5) ◽  
pp. 397-403 ◽  
Author(s):  
Akihiro Yamazaki ◽  
Junichi Kaneko ◽  
Makoto Sugamata
Keyword(s):  
Solid State ◽  
Metal Oxides ◽  
Solid State Reaction ◽  
Mechanically Alloyed

Rapid Synthesis of Zinc Oxide and Lead Oxide Nanorods by One-Step Solid-State Reaction Methods at Ambient Conditions

2005 ◽  
Vol 475-479 ◽  
pp. 3579-3582 ◽  
Author(s):  
Yali Cao ◽  
Lang Liu ◽  
Dienzeng Jia ◽  
Ding Quan Xiao
Keyword(s):  
Zinc Oxide ◽  
Solid State ◽  
Metal Oxides ◽  
Solid State Reaction ◽  
Lead Oxide ◽  
Ambient Conditions ◽  
Rapid Synthesis ◽  
Oxide Nanorods ◽  
Metallic Salts ◽  
One Step

A simple and facilitate method was reported to synthesize zinc oxide and lead oxide nanorods. Two metal oxides nanorods were directly obtained from grinding solid metallic salts and sodium hydroxide in agate mortar with the assistance of a suitable surfactant in only one step, which is different from the results of hydroxides in solution. The as-prepared products were characterized by XRD, TEM and SEM. An explanation describing possible mechanism for the rod-formation is given.

Phase Transformation and Synthesis of Ni Substituted CoSb3 Skutterudite Synthesis during Solid State Reaction

2005 ◽  
Vol 475-479 ◽  
pp. 857-860 ◽  
Author(s):  
Jun You Yang ◽  
Yuehua Chen ◽  
Jiangying Peng ◽  
Wen Zhu ◽  
Xin Li Song
Keyword(s):  
Phase Transformation ◽  
Solid State ◽  
Mechanical Alloying ◽  
Solid State Reaction ◽  
Ball Mill ◽  
Single Phase ◽  
Lattice Parameter ◽  
Maximum Solubility ◽  
Mechanically Alloyed ◽  
Skutterudite Compound

Starting from elemental Co (99.9%), Ni (99.9%) and Sb (99.99%) powders, Co4-xNixSb12 powder mixture with different Ni concentration were subjected to mechanical alloying by using a planetary ball mill. Phase transformation during mechanical alloying process of Co-Ni-Sb system was studied in this paper. Ni substituted skutterudite could be synthesized by solid state reaction. With assistance of hot pressing for two hours, the as mechanically alloyed low Ni concentration powders could be completely transformed into skutterudite compound. The lattice parameter of Ni substituted skutterudite compound complies well with Vegard law when x is not more than 0.2. When Ni concentration is larger than the maximum solubility, NiSb2 compound forms and single phase skutterudite compound can not be obtained.

Progress of solid-state reaction and glass formation in mechanically alloyed Zr65Al7.5Cu17.5Ni10

2000 ◽  
Vol 48 (14) ◽  
pp. 3657-3670 ◽  
Author(s):  
M Seidel ◽  
J Eckert ◽  
I Bächer ◽  
M Reibold ◽  
L Schultz
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Glass Formation ◽  
Mechanically Alloyed

Synthesis and Characterization of Nanosized NiAl Particles

1998 ◽  
Vol 520 ◽  
Author(s):  
T. Chen ◽  
J.M. Hampikian
Keyword(s):  
Solid State ◽  
Mechanical Alloying ◽  
Long Range ◽  
Solid State Reaction ◽  
Shear Bands ◽  
Range Order ◽  
Long Range Order ◽  
Mechanically Alloyed ◽  
Edge Dislocations

ABSTRACTNanophase NiAl powders were synthesized by solid state reaction via ball milling of elemental Ni and Al powders under an argon atmosphere for 0-8 h, 16 h, 24 h, and 48 h. Structural characterization of the nanophase NiAI was performed by x-ray diffraction and transmission electron microscopy. The oxidation behavior of the powders was studied by thermogravimetric analysis. It was found that the Ni + Al = NiAl solid state reaction took place between 4 and 5 hours of mechanical alloying. After 5 h or more of mechanical alloying, the phase of the ball milled particles was the B2 structure, with average grain sizes which decreased with increasing mechanical alloying times. The relationship between the long-range-order parameters and mechanical alloying time was studied. After 5 h, 6 h, 8 h, 16 h, 24 h, and 48 h mechanical alloying, the long-range-order parameter was determined to be approximately 0.82, 0.75, 0.75, 0.75, 0.71, and 0.63, respectively. Iron contamination was observed, resulting from wear of the steel vial and balls. In the mechanically alloyed NiAl nanoparticles, edge dislocations, shear bands, subgrains, distorted regions, and a large number of grain boundaries were observed.

Glass Formation By Mechanical Alloying

1986 ◽  
Vol 80 ◽  
Author(s):  
L. Schultz ◽  
E. Hellstern
Keyword(s):  
Solid State ◽  
Mechanical Alloying ◽  
Solid State Reaction ◽  
Structural Similarity ◽  
Enthalpy Of Mixing ◽  
High Energy ◽  
High Coercivity ◽  
Superconducting Transition ◽  
Mechanically Alloyed ◽  
Glass Forming

AbstractAmorphous metallic powders can be formed by mechanical alloying in a high-energy ball mill. Starting from the elemental, crystalline powders, ball milling first produces powder particles with a characteristically layered microstructure. Further milling leads to an ultrafine composite in which amorphization by solid state reaction takes place. The glass-forming range has been determined in detail for Fe-Zr and Ni-Zr. In Fe-Zr it differs completely from rapidly quenched amorphous samples. A systematic study of alloys of 3d transition metals with Zr and Ti shows that the glass-forming ability depends critically on a large negative free enthalpy of mixing. The results lead to the conclusion that amorphization by mechanical alloying is based on a solid state reaction and occurs under a metastable thermodynamic equilibrium neglecting the existence of intermetallic phases. Measurements of the superconducting transition temperature and Möβbauer studies show the structural similarity of mechanically alloyed and rapidly quenched amorphous samples. Finally mechanical alloying of FeZrB and NdFeB is described. Whereas FeZrB becomes amorphous after an additional annealing, a microcrystalline powder with very high coercivity is formed for NdFeB.

Solid State Reactions in Mechanically Alloyed Al-Li and Al-Li-Mg Alloys with Various Metal Oxides

1998 ◽  
Vol 269-272 ◽  
pp. 157-162 ◽  
Author(s):  
Makoto Sugamata ◽  
Junichi Kaneko ◽  
Hiroyuki Higuchi
Keyword(s):  
Solid State ◽  
Metal Oxides ◽  
Mg Alloys ◽  
Solid State Reactions ◽  
Mechanically Alloyed

Preparation of ZnO•SrO and its Catalysis to PET Depolymerization under Microwave Irradiation

2012 ◽  
Vol 557-559 ◽  
pp. 135-138 ◽  
Author(s):  
Meng Na Zuo ◽  
Wei Lu Zhang ◽  
Qing Hua Feng ◽  
Chun Hua Han ◽  
Dong Zhang
Keyword(s):  
Solid State ◽  
Microwave Irradiation ◽  
Metal Oxides ◽  
Solid State Reaction ◽  
Catalytic Effect ◽  
Gel Permeation Chromatography ◽  
Chain Scission ◽  
Gel Permeation ◽  
Hydrolytic Depolymerization

ZnO•SrO composite metal oxides were prepared via solid-state reaction and characterized by XRD. The catalysis of ZnO•SrO to PET depolymerization under microwave irradiation was studied, and the undepolymerized PET was analysed by Gel permeation chromatography(GPC). It is found that the catalytic effect of ZnO•SrO was optimum when the ratio of catalyst was 0.5%, and the rate of hydrolytic depolymerization of PET reached 93.13%. The degree of chain scission of PET depolymerization catalyzed by ZnO•SrO is deep to some extent under microwave irradiation.

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