Oxidation Behavior of BN/(Al-Mg) Metal Matrix Composites

2005 ◽  
Vol 475-479 ◽  
pp. 975-978
Author(s):  
W.S. Woo ◽  
Woo Gwang Jung ◽  
Dong Bok Lee
Keyword(s):  
Metal Matrix Composites ◽  
Oxidation Resistance ◽  
Metal Matrix ◽  
Oxidation Behavior ◽  
Oxidation Mechanism ◽  
Pressureless Infiltration ◽  
Matrix Composites ◽  
Preferential Oxidation ◽  
Reinforcing Particles ◽  
Infiltration Technique

Metal matrix composites (MMCs) that consisted of Al-Mg matrix reinforced with initially added BN particles were fabricated using the pressureless infiltration technique, and their oxidation behavior was investigated at 500 and 550oC in air. Initially added BN particles were partly consumed to make AlN, as another reinforcing particles. Another reaction product was MgAlB2 dispersoids. Despite of the presence of these reinforcing particles, the oxidation resistance was not good owing to the formation of MgO-rich scale due to the preferential oxidation of Mg in the MMCs. Detailed microstructures and oxidation mechanism of the prepared MMCs are proposed.

Microstructure and Oxidation of Al/BN Composites Fabricated by the Pressureless Infiltration Method

2006 ◽  
Vol 522-523 ◽  
pp. 657-664 ◽  
Author(s):  
Dong Bok Lee
Keyword(s):  
Metal Matrix Composites ◽  
Oxidation Resistance ◽  
Metal Matrix ◽  
Pressureless Infiltration ◽  
Matrix Composites ◽  
Infiltration Method ◽  
Al Matrix

Metal matrix composites (MMCs) consisting of an Al matrix reinforced with initially added BN particles and newly formed AlN dispersoids were fabricated using the pressureless infiltration method. This method led to the incorporation of Mg and nitrogen into the Al matrix. In the retained BN dispersoids, the depletion of nitrogen and enrichment of Al and Mg occurred. The more Mg available, the more AlN formed in the MMCs. The oxidation resistance of the prepared MMCs at 773 and 823 K in air was not satisfactory, owing to the formation of MgO-rich scale. Mg, which was used as an infiltration enhancer precursor, oxidized preferentially, and thereby decreased the oxidation resistance of the prepared MMCs.

Microstructure and Creep Behavior of BN/Al (-Mg) Metal Matrix Composite

2005 ◽  
Vol 297-300 ◽  
pp. 1102-1107
Author(s):  
Dong Bok Lee ◽  
Seung Wan Woo ◽  
Si Yon Bae ◽  
Byeong Soo Lim
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Creep Behavior ◽  
Creep Resistance ◽  
Metal Matrix ◽  
The Other ◽  
Pressureless Infiltration ◽  
Matrix Composites ◽  
Reinforcing Particles ◽  
Infiltration Technique

Metal matrix composites (MMC) that consisted of Al (-Mg) matrix reinforced with initially added BN particles were fabricated using the pressureless infiltration technique. Initially added BN particles were partly consumed to make AlN, as new reinforcing particles. The other reaction product was MgAlB2 dispersoids. The creep behavior was investigated between 225- 275oC in air. Despite of the presence of the reinforcing particles, the creep resistance was found to be unsatisfactory due to the weak Al (-Mg) matrix.

Ni-Doping Alumina Foams for Fabricating MMCs by Pressureless Infiltration Using Fe Alloy

2010 ◽  
Vol 37-38 ◽  
pp. 712-717 ◽  
Author(s):  
Shao Feng Yang ◽  
Wei Ping Chen ◽  
Meng Yan Han ◽  
De Zhi Zhu
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Three Dimensional ◽  
Vacuum Furnace ◽  
Pressureless Infiltration ◽  
Matrix Composites ◽  
Ni Doping ◽  
Structural Homogeneity ◽  
Impregnation Technique ◽  
Infiltration Technique

The preparation of Ni-doping alumina foams as precursors for MMCs (Metal Matrix Composites) fabrication was studied. Alumina foams were successfully adulterated with Ni using organic foam impregnation technique. Uniform Ni particles were distributed in alumina struts after they were sintered in a vacuum furnace. At the crucial infiltration step, an inducer such as elemental Ni melted so that interpenetrating channels were created in the ceramics. In contact with Fe melt, the metal matrix could spontaneously infiltrate in alumina foams struts. The influence of infiltration was subsequently investigated by SEM and EDS. Preliminary results showed that the interface between Ni-doping alumina foams and Fe metal matrix reached a full structural homogeneity and the use of Ni-doping alumina foams enhanced the capability of infiltration when processing continuous three-dimensional interconnected ceramics/metal networks MMCs by pressureless infiltration technique.

The fabrication of metal matrix composites by a pressureless infiltration technique

1991 ◽  
Vol 26 (2) ◽  
pp. 447-454 ◽  
Author(s):  
M. K. Aghajanian ◽  
M. A. Rocazella ◽  
J. T. Burke ◽  
S. D. Keck
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Pressureless Infiltration ◽  
Matrix Composites ◽  
Infiltration Technique

Activated pressureless infiltration of metal-matrix composites with graded activator content

2009 ◽  
Vol 40 (10) ◽  
pp. 1566-1572 ◽  
Author(s):  
M. Bahraini ◽  
T. Minghetti ◽  
M. Zoellig ◽  
J. Schubert ◽  
K. Berroth ◽  
...  
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Pressureless Infiltration ◽  
Matrix Composites

scholarly journals Microstructural Characterization of TiC-Reinforced Metal Matrix Composites Fabricated by Laser Cladding Using FeCrCoNiAlTiC High Entropy Alloy Powder

2021 ◽  
Vol 11 (14) ◽  
pp. 6580
Author(s):  
Sangwoo Nam ◽  
Hyung Won Lee ◽  
In-Ho Jung ◽  
Young-Min Kim
Keyword(s):  
Metal Matrix Composites ◽  
Laser Cladding ◽  
Heat Input ◽  
Metal Matrix ◽  
Alloy Powder ◽  
Coating Layer ◽  
High Entropy Alloy ◽  
Matrix Composites ◽  
High Entropy ◽  
Reinforcing Particles

TiC-reinforced metal matrix composites were fabricated by laser cladding and FeCrCoNiAlTiC high entropy alloy powder. The heat of the laser formed a TiC phase, which was consistent with the thermodynamic calculation, and produced a coating layer without interfacial defects. TiC reinforcing particles exhibited various morphologies, such as spherical, blocky, and dendritic particles, depending on the heat input and coating depth. A dendritic morphology is observed in the lower part of the coating layer near the AISI 304 substrate, where heat is rapidly transferred. Low heat input leads to an inhomogeneous microstructure and coating depth due to the poor fluidity of molten pool. On the other hand, high heat input dissolved reinforcing particles by dilution with the substrate. The coating layer under the effective heat input of 50 J/mm2 had relatively homogeneous blocky particles of several micrometers in size. The micro-hardness value of the coating layer is over 900 HV, and the nano-hardness of the reinforcing particles and the matrix were 17 GPa and 10 GPa, respectively.

Sign in / Sign up

Export Citation Format

Share Document