Self-Propagating High-Temperature Synthesis of Aluminum Nitride and its Characterization

2004 ◽  
Vol 449-452 ◽  
pp. 213-216 ◽  
Author(s):  
Jae Ryeong Lee ◽  
Ikkyu Lee ◽  
Dong Jin Kim ◽  
Yang Kyu Ahn ◽  
Hun Saeng Chung
Keyword(s):  
High Temperature ◽  
Aluminum Nitride ◽  
Sample Size ◽  
Packing Density ◽  
Bulk Sample ◽  
Nitrogen Pressure ◽  
Front Velocity ◽  
Dilution Factor ◽  
Temperature Synthesis ◽  
High Temperature Synthesis

Aluminum nitride was synthesized by self-propagating high-temperature synthesis (SHS) with flaky aluminum powder in various conditions such as particle size, nitrogen pressure (PN 2), dilution factor f( Dil</sub), packing density, and bulk sample size. AlN content in the SHS product increases with an increase of fDil, and it eventually reaches about 95 % at fDil=0.6. Generally, reaction front velocity is significantly affected by PN2 and packing density, but not by fDil. The degree of AlN conversion reduces more or less with an increase of bulk sample size, but that could be improved by using the SHS pre-prepared product as a diluent.

Sintering behavior of aluminum nitride powder prepared by self-propagating high-temperature synthesis method

Rare Metals ◽  
2015 ◽  
Vol 37 (12) ◽  
pp. 1091-1095 ◽  
Author(s):  
Liang Qiao ◽  
Shu-Wen Chen ◽  
Li-Qiang Jiang ◽  
Kazuo Shinozaki ◽  
Sheng-Lei Che
Keyword(s):  
High Temperature ◽  
Aluminum Nitride ◽  
Synthesis Method ◽  
Sintering Behavior ◽  
Nitride Powder ◽  
Temperature Synthesis ◽  
High Temperature Synthesis

Mechanical Activation as a New Method for SHS

2006 ◽  
Vol 45 ◽  
pp. 979-988 ◽  
Author(s):  
Frédéric Bernard ◽  
Sébastien Paris ◽  
Eric Gaffet
Keyword(s):  
High Temperature ◽  
Mechanical Activation ◽  
Combustion Front ◽  
Front Velocity ◽  
Thermal Heating ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
End Products ◽  
Elemental Powder Mixture ◽  
Short Time

The use of mechanical activation (the elemental powder mixture is milled for a short time at given frequency and impact energy) as a precursor to self-propagating high-temperature synthesis (SHS) results in the formation of nanostructured porous materials. The mechanical activation step was found necessary (i) to modify the thermal parameters of the combustion front (i.e. combustion front velocity, thermal heating rate…) in the cases of Mo-Si, Fe-Al, Ni-Si (ii) to initiate a combustion front in the case of systems having a low exothermicity. Nevertheless, the control of the mechanically activated mixture characteristics and, the understanding of the mechanical activation role on the SHS parameters are essential to produce end-products with expected microstructure.

Self-Propagating High-Temperature Synthesis for Aluminum Oxynitride (AlON)

2006 ◽  
Vol 510-511 ◽  
pp. 662-665 ◽  
Author(s):  
Jae Ryeong Lee ◽  
Ikkyu Lee ◽  
Hun Saeng Chung ◽  
Jong Gwan Ahn ◽  
Dong Jin Kim ◽  
...  
Keyword(s):  
High Temperature ◽  
Nitrogen Pressure ◽  
Combustion Reaction ◽  
Aluminum Oxynitride ◽  
Temperature Synthesis ◽  
Peak Intensity ◽  
High Temperature Synthesis

As the result of combustion reaction in Al-Al2O3-N2 system, AlON phase can be synthesized in the range of initial nitrogen pressure, from 1 to 5 MPa. On the occasion of rm = 0.3, the unreacted Al was detected in the case of 1 MPa of PN2. Its intensity decreases with an increase of nitrogen pressure. Ultimately, no peak of Al was observed in the product at nitrogen pressure of 5 MPa. In addition, the peak intensity of AlON in the products increases proportionally with the nitrogen pressure, while the intensities of AlN and Al2O3 decrease slightly with an increase of nitrogen pressure. The formation of AlON may be induced by successive two reactions. The former is the formation of AlN, and the latter is the reaction between AlN and Al2O3 in the after-burning period sustaining high temperature.

A self-propagating high-temperature synthesis method for synthesis of AlN powder

1999 ◽  
Vol 14 (5) ◽  
pp. 1928-1933 ◽  
Author(s):  
Shyan-Lung Chung ◽  
Wen-Liang Yu ◽  
Chun-Nan Lin
Keyword(s):  
High Temperature ◽  
Fine Particles ◽  
Synthesis Method ◽  
Product Yield ◽  
Nitrogen Pressure ◽  
Reaction Chamber ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Experimental Parameters ◽  
Low Nitrogen

A new self-propagating high-temperature synthesis (SHS) process has been developed for synthesis of AlN powder under low nitrogen pressures. Al and NH4X (X = F, Cl, Br, or I) powders were mixed and pressed into a compact, which was placed in a reaction chamber filled with nitrogen. The combustion synthesis reaction was ignited by heating directly the compact, and high product yields (∼90%) were obtained under nitrogen pressures of around 0.5 MPa. The product yield was affected by the reactant composition, the nitrogen pressure, and the compact-forming pressure. The powder as synthesized consists mainly of fibers, coarse granules, and agglomerated fine particles, which become mostly smaller than 10 μm after grinding. A reaction process was also proposed that explains the effects of the experimental parameters on the product yield.

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