Phase transformations in Si-based alloy powder mixtures induced by microwave heating in a 2.45 GHz single-mode applicator

2010 ◽  
Vol 18 (11) ◽  
pp. 2030-2033 ◽  
Author(s):  
Song Li ◽  
Guoqiang Xie ◽  
Dmitri V. Louzguine-Luzgin ◽  
Ziping Cao ◽  
Noboru Yoshikawa ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Microwave Heating ◽  
Alloy Powder ◽  
Single Mode ◽  
Powder Mixtures

scholarly journals Melt-driven mechanochemical phase transformations in moderately exothermic powder mixtures

2016 ◽  
Vol 15 (12) ◽  
pp. 1280-1286 ◽  
Author(s):  
Samuel A. Humphry-Baker ◽  
Sebastiano Garroni ◽  
Francesco Delogu ◽  
Christopher A. Schuh
Keyword(s):  
Phase Transformations ◽  
Powder Mixtures

Effect of Boron and Carbon Addition on the Phase Transformations during High-Energy Ball Milling and Subsequent Sintering of Si3N4+B and Si3N4+C Powder Mixtures

2016 ◽  
Vol 869 ◽  
pp. 58-63
Author(s):  
Luiz Otávio Vicentin Maruya ◽  
Bruna Rage Baldone Lara ◽  
Belmira Benedita de Lima ◽  
Vanessa Motta Chad ◽  
Gilberto Carvalho Coelho ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Ball Milling ◽  
Weight Ratio ◽  
High Energy ◽  
Ceramic Composites ◽  
Nitrogen Atmosphere ◽  
Carbon Addition ◽  
Powder Mixtures ◽  
X Ray ◽  
Milled Powders

This study reports on effect of boron and carbon addition on the phase transformations during ball milling and subsequent sintering of Si3N4+B and Si3N4+C powder mixtures. Ball milling at room temperature was conducted using stainless steel vials (225 mL) and balls (19mm diameter), 300 rpm and a bal-to-powder weight ratio of 10:1. The as-milled powders were uniaxially compacted in order to obtain cylinder samples with 10 mm diameter, which were subsequently sintered under nitrogen atmosphere at 1500°C for 1h. Characterization of the as-milled powders and sintered samples was performed by X-ray diffraction, scanning electron microscopy, and energy dispersive spectrometry. Only peaks of Si3N4 were identified in X-ray diffractograms of as-milled Si3N4+B and Si3N4+C powders, suggesting that metastable structures were found during milling. After sintering at 1500°C for 1h, the Si3N4+BN and Si3N4+SiC ceramic composites were formed from the mechanically alloyed Si3N4+B and Si3N4+C powders.

Effect of Nitridation Magnetic Properties of Nanocrystalline Fe-Co Alloy Powders

2010 ◽  
Vol 654-656 ◽  
pp. 1106-1109
Author(s):  
Ya Qiong He ◽  
Chang Hui Mao ◽  
Jian Yang
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Alloy Powder ◽  
High Energy ◽  
X Ray Diffraction ◽  
Powder Mixtures ◽  
X Ray ◽  
Transmission Electron ◽  
Nitridation Temperature ◽  
Microstructure And Magnetic Properties

Nanocrystalline Fe-Co alloy powders, which were prepared by high-energy mechanical milling, were nitrided under the mixing gas of NH3/H2 in the temperature range from 380°C to 510°C. X-ray diffraction (XRD) was used to analyze the grain size and reaction during the processing. The magnetic properties of the nitrided powders were measured by Vibrating Sample Magnetometer (VSM). The results show that with the appearance of Fe4N phase after nitride treatment, and the grain-size of FeCo phase decreases with the increase of nitridation temperature between 380°C to 450°C.The saturation magnetization of nitrided alloy powder treated at 480°C is about 18% higher than that of the initial Fe-Co alloy powder, accompanied by the reduction of the coercivity. Transmission electron microscope (TEM) was used, attempting to further analyze the effect of Fe4N phase on microstructure and magnetic properties of the powder mixtures.

Effects of ultrasonic vibrations on the porosity and hardness of compacts in the pressing of hard-alloy powder mixtures

1975 ◽  
Vol 14 (9) ◽  
pp. 717-720
Author(s):  
L. G. Kostin ◽  
L. T. Buchek ◽  
V. M. Shkil' ◽  
N. N. Sumaneev ◽  
M. E. Grenader ◽  
...  
Keyword(s):  
Hard Alloy ◽  
Alloy Powder ◽  
Ultrasonic Vibrations ◽  
Powder Mixtures

Application of microwave heating to ceramic processing: Design and initial operation of a 2.45-GHz single-mode furnace

1996 ◽  
Vol 24 (3) ◽  
pp. 1041-1049 ◽  
Author(s):  
A.W. Fliflet ◽  
R.W. Bruce ◽  
A.K. Kinkead ◽  
R.P. Fischer ◽  
D. Lewis ◽  
...  
Keyword(s):  
Microwave Heating ◽  
Single Mode ◽  
Ceramic Processing ◽  
Initial Operation

Phase transformations in Fe–Ni system at mechanical alloying and consequent annealing of elemental powder mixtures

2001 ◽  
Vol 299 (3-4) ◽  
pp. 236-241 ◽  
Author(s):  
S.D Kaloshkin ◽  
V.V Tcherdyntsev ◽  
I.A Tomilin ◽  
Yu.V Baldokhin ◽  
E.V Shelekhov
Keyword(s):  
Mechanical Alloying ◽  
Phase Transformations ◽  
Elemental Powder ◽  
Powder Mixtures

Reaction Sintering of Ceramic Materials by Microwave Heating

1992 ◽  
Vol 269 ◽  
Author(s):  
Ph. Boch ◽  
N. Lequeux ◽  
P. Piluso
Keyword(s):  
Microwave Heating ◽  
Ceramic Materials ◽  
Reaction Sinter ◽  
Conventional Heating ◽  
Reaction Sintering ◽  
Aluminum Titanate ◽  
Powder Mixtures ◽  
Titanate Ceramics

ABSTRACTMicrowave heating was used to reaction sinter Al2O3 + SiO2 and Al2O3 + TiO2 powder mixtures to prepare mullite and aluminum titanate ceramics, respectively. In comparison with conventional heating, microwave heating leads to a decrease in the temperatures of treatment of 50 to 100°C.

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