Nano-Sized SiC Particulates Dispersed SiAlON Ceramics

In order to improve wear resistance of carbon steel, laser cladding experiments were carried out using a 3kW continuous wave CO2 laser. The diameter of the laser beam was 3-5mm, the scanning velocity was 3-10mm/s, and the laser output power was 1.0-1.3kW. The experimental results showed that MoSi2/SiCP composites coating could be in-situ synthesized from mixture powders of molybdenum, silicon and SiC by laser cladding. A good metallurgical bond between the coating and the substrate could be achieved. The microstructures of the coating were mainly composed of MoSi2, SiC and FeSiMo phases. The average microhardness of the coating was about HV0.21300, about 6.0 times larger than that of steel substrate.

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A Novel Route for Development of Bulk Al/SiC Metal Matrix Nanocomposites

Journal of Nanotechnology ◽

10.1155/2011/413512 ◽

2011 ◽

Vol 2011 ◽

pp. 1-5 ◽

Cited By ~ 3

Author(s):

Payodhar Padhi ◽

Sachikanta Kar

Keyword(s):

Metal Matrix ◽

Spray Deposition ◽

Aluminum Matrix ◽

Weight Percent ◽

Nano Particles ◽

Solidification Processing ◽

Ultrasonic Probe ◽

Metal Matrix Nanocomposites ◽

Sic Particulates ◽

Matrix Nanocomposites

Addition of nano particles, even in quantities as small as 2 weight percent can enhance the hardness or yield strength by a factor as high as 2. There are several methods for the production of metal matrix nanocomposites including mechanical alloying, vertex process, and spray deposition and so forth. However, the above processes are expensive. Solidification processing is a relatively cheaper route. During solidification processing, nano particulates tend to agglomerate as a result of van der Waals forces and thus proper dispersion of the nano particulate in metal matrix is a challenge. In the present study a noncontact method, where the ultrasonic probe is not in direct contact with the liquid metal, was attempted to disperse nanosized SiC particulates in aluminum matrix. In this method, the mold was subjected to ultrasonic vibration. Hardness measurements and microstructural studies using HRTEM were carried out on samples taken from different locations of the nanocomposite ingot cast by this method.

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Silicon Carbide Effect as Reinforcement on Aluminium Metal Matrix Composite

Journal of the chemical society of pakistan ◽

10.52568/000776/jcsp/41.04.2019 ◽

2019 ◽

Vol 41 (4) ◽

pp. 650-650

Author(s):

Ali Dad Chandio Ali Dad Chandio ◽

Muhammad Basit Ansari Muhammad Basit Ansari ◽

Shahid Hussain Shahid Hussain ◽

Muhammad Ali Siddiqui Muhammad Ali Siddiqui

Keyword(s):

Silicon Carbide ◽

Stress Transfer ◽

Stir Casting ◽

Powder Metallurgy Method ◽

Casting Method ◽

Morphological Evaluation ◽

Sic Particulates ◽

Dislocation Strengthening ◽

Sic Composites ◽

Aluminium Metal

In the present study aluminium silicon carbide (Al/SiC) composites were prepared by powder metallurgical method. The mechanical and morphological evaluation were studied upon the variation of reinforcements percentages i.e.10, 15 and 20 wt.% of SiC powder were used as the reinforcements in aluminium matrix. The comparison of powder metallurgy method with stir casting method of Al/ (SiC) composites preparation was performed and the particle reinforcements were visualized through Scanning Electron Microscopy (SEM). The results demonstrated increased hardness with increasing wt. % of SiC particles. This was attributed to efficient stress transfer and dislocation strengthening. In addition, the densification behaviour of the composites was also studied and SiC particulates were found to exhibit profound effect on composites density.

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