Combustion Synthesis of Niobium Aluminide Matrix Composites

1994 ◽  
Vol 350 ◽  
Author(s):  
C. R. Kachelmyer ◽  
A. Varma
Keyword(s):  
Melting Point ◽  
Combustion Synthesis ◽  
Thermal Explosion ◽  
Matrix Composites ◽  
Product Density ◽  
B Additions ◽  
Reaction Completion ◽  
Niobium Aluminide

AbstractCombustion synthesis of NbAl3-matrix composites with Al2O3 and B additions was studied using the thermal explosion mode. The addition of B to the reaction mixture resulted in the formation of NbB2, small amounts of NbB and unreacted Al. The Al2O3 addition did not affect the NbAl3-matrix reaction completion but the final product density increased with increasing Al2O3 loading. In both NbAl3-matrix composites, the reaction was initiated above the melting point of Al.

Microstructure Evolution during Combustion Synthesis of Ni/Ni-Aluminide Laminated Composites

2012 ◽  
Vol 724 ◽  
pp. 319-322
Author(s):  
Ya Jie Guo ◽  
Zhong Qi Shi ◽  
Hong Wei Li ◽  
Gui Wu Liu ◽  
Guan Jun Qiao
Keyword(s):  
Heat Treatment ◽  
Melting Point ◽  
Combustion Synthesis ◽  
Thermal Explosion ◽  
Microstructure Evolution ◽  
Laminated Composites ◽  
Intermetallic Phases ◽  
Post Heat Treatment ◽  
Plasma Activated Sintering ◽  
Intermetallic Layers

Combustion reaction in laminated Ni and Al foils was ignited by plasma activated sintering (PAS) to synthesize metal-intermetallic laminated composites (MILCs). The microstructure evolution in the reaction and the post-heat treatment was investigated. The results showed that thermal explosion (TE) reaction were happened between Ni and Al foils at the melting point of Al. The reaction was incomplete due to the heat loss through the thick foils. The produced phases, Ni2Al3 and NiAl3, were converted to a compositionally gradient series of intermetallic phases in the nal microstructures of the intermetallic layers after the post heat treatment.

Mechanistic and processing studies in combustion synthesis of niobium aluminides

1995 ◽  
Vol 10 (9) ◽  
pp. 2260-2270 ◽  
Author(s):  
C.R. Kachelmyer ◽  
A.S. Rogachev ◽  
A. Varma
Keyword(s):  
Melting Point ◽  
Combustion Synthesis ◽  
Heating Rate ◽  
Ignition Temperature ◽  
Product Formation ◽  
Green Density ◽  
Combustion Mode ◽  
Heating Rates ◽  
Niobium Aluminide ◽  
Niobium Aluminides

Combustion synthesis of NbAl3 and Nb2Al was studied using the volume combustion mode. The effects of heating rate and green density were examined for NbAl3 synthesis. The effect of green density was also investigated for Nb2Al. Greater reaction completion was achieved at higher heating rates and green densities. In both NbAl3 and Nb2Al samples, the reaction was initiated above the melting point of Al. Quenching (Nb+3Al) samples pressed at relatively high and low densities below the ignition temperature, and results of a particle-foil experiment, identified the spreading characteristic of molten Al over Nb, providing mechanistic details about niobium aluminide product formation.

Combustion synthesis of Ni3Al and Ni3Al-matrix composites

1992 ◽  
Vol 23 (1) ◽  
pp. 69-76 ◽  
Author(s):  
J. P. Lebrat ◽  
A. Varma ◽  
A. E. Miller
Keyword(s):  
Combustion Synthesis ◽  
Matrix Composites

Preparation of FeTiC composites by the thermal-explosion mode of combustion synthesis

1997 ◽  
Vol 23 (2) ◽  
pp. 185-189 ◽  
Author(s):  
A. Saidi ◽  
A. Chrysanthou ◽  
J.V. Wood ◽  
J.L.F. Kellie
Keyword(s):  
Combustion Synthesis ◽  
Thermal Explosion

Combustion synthesis method for synthesis of aluminum nitride powder using aluminum containers

2001 ◽  
Vol 16 (12) ◽  
pp. 3518-3525 ◽  
Author(s):  
Chun-Nan Lin ◽  
Shyan-Lung Chung
Keyword(s):  
Melting Point ◽  
Aluminum Nitride ◽  
Combustion Synthesis ◽  
Process Parameters ◽  
Synthesis Method ◽  
Product Yield ◽  
Combustion Reaction ◽  
Nitride Powder ◽  
Al Powder ◽  
Aluminum Container

A combustion synthesis method was developed for synthesis of AlN powder. Al powder and small amounts of NH4Cl were thoroughly mixed and placed in low-melting-point containers made of a thin, perforated aluminum sheet. The combustion reaction was ignited by heating the top surface of the powder stack, and the aluminum container was converted completely to AlN during the combustion reaction. High product yields were obtained under N2 pressures of 0.2–0.5 MPa. The product was composed of a dense outer portion and a loose inner portion. Effects of several process parameters on the product yield were investigated and discussed.

Combustion synthesis of niobium aluminide and its mechanical properties

1992 ◽  
Vol 11 (8) ◽  
pp. 475-476 ◽  
Author(s):  
A. K. Bhattacharya ◽  
C. T. Ho ◽  
J. A. Sekhar
Keyword(s):  
Mechanical Properties ◽  
Combustion Synthesis ◽  
Niobium Aluminide

Influence of Compaction Pressure on Density, Bending Strength, and Microstructures of Al2O3-SiC-ZrO2 Ceramic Matrix Composites with Nb2O5 Additives

2018 ◽  
Vol 923 ◽  
pp. 61-65
Author(s):  
Dewi Lestari Natalia ◽  
Risly Wijanarko ◽  
Irene Angela ◽  
Bondan Tiara Sofyan
Keyword(s):  
Bending Strength ◽  
Compaction Pressure ◽  
Density Measurement ◽  
Ceramic Matrix Composites ◽  
High Hardness ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Sintering Process ◽  
Product Density ◽  
Microstructure Observation

Ceramic matrix composites (CMCs) are known to have high hardness, temperature and corrosion resistance, while being comparatively lightweight. One of many external factors that influence the mechanical properties of CMC is the compaction pressure given during fabrication process. Generally, greater amount of applied compaction pressure will result in improved final product density and bending strength. In this research, a type of CMCs was fabricated using Al2O3, SiC, and ZrO2 powder mixed with Nb2O5 additive of 81Al2O3-10SiC-5ZrO2-4Nb2O5 wt. % composition. Fabrication was done through mixing, compacting, and sintering process. Compaction was performed at 257, 308, and 359 MPa and finished with sintering process at 1400 °C for 4 h. Final samples were characterized by density measurement, 3-point bending strength testing, XRD for phase investigation, and microstructure observation using SEM-EDS. Results showing that samples with 308 MPa compaction pressure possessed the highest density and bending strength of 3.29 gr/cm3 and 14.91 MPa, respectively. These numbers however, declined on samples with higher compaction pressure of 359 MPa due to the formation of porosities caused by entrapped gas that failed to exit the sample of which compaction pressure was considered to be overwhelmingly high.

Microwave combustion synthesis of in situ Al 2 O 3 and Al 3 Zr reinforced aluminum matrix composites

2015 ◽  
Vol 68 ◽  
pp. 283-288 ◽  
Author(s):  
Heguo Zhu ◽  
Bo Hua ◽  
Tao Cui ◽  
Jiewen Huang ◽  
Jianliang Li ◽  
...  
Keyword(s):  
Combustion Synthesis ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Microwave Combustion

Formation mechanism of MoSi2in presence of copper by combustion synthesis: study in thermal explosion mode

2008 ◽  
Vol 51 (3) ◽  
pp. 263-267 ◽  
Author(s):  
F. A. Javid ◽  
M. H. Abbasi ◽  
A. Saidi ◽  
M. Shamanian ◽  
M. S. Khoshkhoo
Keyword(s):  
Combustion Synthesis ◽  
Thermal Explosion ◽  
Formation Mechanism
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