Characteristic reaction products in the AZ91/SiC composite fabricated by pressureless infiltration technique

2009 ◽  
Vol 15 (1) ◽  
pp. 33-36 ◽  
Author(s):  
K. B. Lee ◽  
J. H. Choi ◽  
H. Kwon
Keyword(s):  
Pressureless Infiltration ◽  
Reaction Products ◽  
Infiltration Technique

Fabrication of BN/Al(-Mg) Metal Matrix Composite (MMC) by Pressureless Infiltration Technique

2004 ◽  
Vol 449-452 ◽  
pp. 301-304
Author(s):  
Woo Gwang Jung ◽  
Hoon Kwon
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Al Alloy ◽  
Pressureless Infiltration ◽  
Reaction Products ◽  
Thermodynamic Investigation ◽  
The Matrix ◽  
Infiltration Technique ◽  
Plate Type

BN/Al(-Mg) metal matrix composite (MMC) was fabricated by the pressureless infiltration technique. The phase characterizations of the composites were analyzed using the SEM, TEM, EDS and EPMA on reaction products after the electrochemical dissolution of the matrix. It is confirmed that aluminum nitride (AlN) was formed by the reaction of Mg3N2and Al alloy melt. Plate type AlN and polyhedral type Mg(-Al) boride were formed by the reaction between Mg2N2, BN and molten Al in the composite. The reaction mechanism in the fabrication of BN/Al(-Mg)MMC was derived from the phase analysis results and the thermodynamic investigation.

Microstructure and Hardness Performance of a SiCp/Al Composite by Pressureless Infiltration Technique

2007 ◽  
Vol 353-358 ◽  
pp. 1318-1321
Author(s):  
Qiang Zhang ◽  
Jie Cai Han ◽  
Ye Zhu ◽  
Gao Hui Wu
Keyword(s):  
Thermal Exposure ◽  
Xrd Analysis ◽  
Interfacial Reactions ◽  
Pressureless Infiltration ◽  
Reaction Products ◽  
Infiltration Process ◽  
Al Composite ◽  
Spontaneous Infiltration ◽  
Infiltration Technique ◽  
Exposure Process

In the present work, a SiCp/Al composite was fabricated by pressureless infiltration of aluminum alloy into loose-packed SiC particles preform, and its microstructure and hardness performance were investigated. The results showed that the composite was fully infiltrated and the particles were distributed uniformly in the composite. Interfacial reactions were found in the as-cast composite and the reaction product was identified as MgAl2O4 by TEM observation and XRD analysis. The interfacial reactions enhanced the wettability and promote the spontaneous infiltration process. The thermal exposure process increased the Brinell hardness of the composite. After the thermal exposure process, the block-like interfacial reaction products were distributed discretely, but the amount of the reaction products was increased.

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.

Sign in / Sign up

Export Citation Format

Share Document