Reaction Sintering of Mg2Si Intermetallic Compound by Microwave Irradiation

2012 ◽  
Vol 512-515 ◽  
pp. 1683-1686
Author(s):  
Chang Kun Du ◽  
Shu Cai Zhou
Keyword(s):  
Solid State ◽  
Intermetallic Compound ◽  
Microwave Field ◽  
Phase Reaction ◽  
Reaction Sintering ◽  
Green Density ◽  
Power Setting ◽  
Lower Heating Rate ◽  
Lower Heating ◽  
Heating Profile

In order to reduce the oxidizing and volatilizing caused by Mg element in the traditional methods for synthesizing Mg2Si compounds, solid state phase reaction at low temperature was introduced by microwave field. XRD was used to characterize the powders. At the same time, the influences of parameters during the synthesis processing were discussed. The results suggest that the heating profile is also dependent on the initial green density and higher green density provides lower heating rate while power setting are fixed and the oxidation of Mg can be rest rained by changing microwave heating programs. It was found that high purity Mg2Si intermetallic compound can be obtained with excessive content of 8at% Mg from the stoichiometric Mg2Si, 853K and 30min

A Fast Synthesis and Sintering of Mg2Si1−xSnx (0≤x≤1.0) Solid Solutions by Microwave Irradiation

2011 ◽  
Vol 197-198 ◽  
pp. 417-420 ◽  
Author(s):  
Shu Cai Zhou ◽  
Chen Guang Bai ◽  
Chun Lin Fu
Keyword(s):  
Microwave Irradiation ◽  
Solid Solutions ◽  
Microwave Assisted Synthesis ◽  
Green Density ◽  
X Ray Diffraction ◽  
Power Setting ◽  
Xrd Patterns ◽  
Heating Behavior ◽  
Fast Synthesis ◽  
Lower Heating

In order to reduce the oxidizing and volatilizing caused by Mg element in the traditional methods for synthesizing Mg2Sil-xSnxsolid solutions, Mg2Sil-xSnxsolid solutions have been prepared by Microwave-assisted Synthesis techniques. The heating behavior of Mg, Si and Sn fixed powder was investigated under microwave irradiation. X-ray diffraction (XRD) was used to characterize the powders. The results suggest that the temperature-rising rate is also dependent on the initial green density and higher green density provides lower heating rate while power setting are fixed. XRD patterns show that Mg2Sil-xSnxsolid solutions have been well formed under microwave irradiation.

Microwave Reaction Sintering of Tungsten Carbide Cobalt Hardmetals

1996 ◽  
Vol 430 ◽  
Author(s):  
T. Gerdes ◽  
M. Willert-Porada ◽  
K. Rödiger ◽  
K. Dreyer
Keyword(s):  
Mechanical Properties ◽  
Tungsten Carbide ◽  
Microwave Field ◽  
Phase Reaction ◽  
Reaction Sintering ◽  
Densification Behavior ◽  
Fine Grained ◽  
Microwave Reaction ◽  
Liquid Phase Reaction ◽  
Processing Cycle

AbstractMicrowave reaction sintering of tungsten- carbon-, cobalt mixtures is described as a method that combines the liquid phase reaction sintering of tungsten carbide cobalt hardmetals with the enhanced densification behavior of hardmetals in the microwave field. Starting with green parts composed of W-, Co- powder, soot as carbon source and with varying amount of additives a dense and extremely fine grained hardmetal can be obtained in one pressureless microwave reaction sintering step.By this method hardmetals with improved mechanical properties can be obtained in a drastically simplified processing cycle, without time consuming steps such as carburizing and milling.

Effect of Heating Rate on Sintered Microstructure of W-Cu Nanocomposite Powder Produced Using W-CuO Mixture

2004 ◽  
Vol 449-452 ◽  
pp. 1125-1128
Author(s):  
Dae Gun Kim ◽  
Gil Su Kim ◽  
Jin Chun Kim ◽  
Sung Tag Oh ◽  
Young Do Kim
Keyword(s):  
Heating Rate ◽  
Nanocomposite Powder ◽  
Lower Heating Rate ◽  
Nanocomposite Powders ◽  
Heating Up ◽  
Lower Heating

The sintered microstructure homogeneity of W-15wt%Cu nanocomposite powders prepared from W-CuO mixture was investigated. The increment of heating rate considerably affected the homogeneity of sintered microstructure. In case of the higher heating rate, the microstructure was more homogeneous than that of the lower heating rate by reason of Cu- exudation during heating-up process.

Kinetics and Mechanism of the Microwave Synthesis of Barium Titanate

1996 ◽  
Vol 430 ◽  
Author(s):  
Hanlin Zhang ◽  
Shixi Ouyang ◽  
Hanxing Liu ◽  
Yongwei Li
Keyword(s):  
Activation Energy ◽  
Solid State ◽  
Microwave Field ◽  
Formation Rate ◽  
Xrd Analysis ◽  
Conventional Heating ◽  
Heating Process ◽  
Formation Kinetics ◽  
Kinetics Of ◽  
Synthesis Of Barium Titanate

AbstractThe formation kinetics of BaTiO3from the solid-state BaCO3and TiO2powder in a microwave field was investigated. The quantitative XRD analysis and the model considered the volume change between reactant and product were used in this experiment. Results show that the formation rate of BaTiO3in a microwave field is much faster than upon conventional heating. The activation energy of the solid state reaction for BaTiO3was measured as 58 kJ/mol. This indicates the enhancement of diffusion by the microwave heating process.

Fine-Particle Lithium Iron Phosho-Olivine Synthesized by a Novel Modified Solid-State Reaction

2007 ◽  
Vol 336-338 ◽  
pp. 524-525
Author(s):  
Rong Yang ◽  
Xiao Ping Song ◽  
Xiu Fen Pang ◽  
Ming Shu Zhao ◽  
Fei Wang
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Room Temperature ◽  
Specific Capacity ◽  
Solid State Reaction Method ◽  
Phase Reaction ◽  
Two Phase ◽  
Reaction Proceeds ◽  
Initial Charge ◽  
Xrd Patterns

In this paper, homogeneous and well-crystallized LiFePO4 was synthesized by a novel modified solid-state reaction method following by heat treatment at relatively low temperature of 500°C in Ar. No impurities are detected in the XRD patterns. The initial charge specific capacity and discharge specific capacity reach 157.2mAhg-1 and 152.6mAhg-1 respectively at 20°C. Voltage plateaus at around 3.45V were observed in all the curves, indicating that the charge and discharge reaction proceeds as a two-phase reaction. The initial charge specific capacity is 157.2mAhg-1 at 0.1C rate, i.e. 92% of the theoretical capacity, and specific capacity decreases slightly after 100 circles at room temperature.

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