Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : kaolin

Mechanical Strength of Silicon Carbide Bonded with Iraqi Clays

Abdul Mutalb Al Sheikh; Shihab Ahmed Zaidan Al- Juboori; Kassim S. Kassim

Engineering and Technology Journal, 2011, Volume 29, Issue 4, Pages 665-676

Two types of Iraqi clays (Kaolin and Bentonite) were used in bonding process
with different weight percentage (5%, 10%, 15%, 20%, and 25%) and with
different particle size from clays and silicon carbide.
The specimens were formed by using low biaxial pressing and two types of
internal lubricants (sodium silicate and the carbon paste) to increase the
specimen's cohesion. These specimens were sintered at various temperatures of
(1100°C, 1200°C, 1300°C, and 1400°C).
Increasing of clay percentage leads to decreasing the porosity. But it leads to
increase mechanical properties (compressive strength, diametrical strength and
bending strength ). Also, the effect of particle size on all properties is studied
together with sintering temperature. All mechanical properties (when bonded SiC
with bentonite) are higher than kaolin bonded SiC.

Engineering Requirement Development of Barium Ferrite as Absorbent Radar Waves Material

Engineering and Technology Journal, 2010, Volume 28, Issue 8, Pages 335-346

This research is a treatment trying of the Barium ferrite properties which
obstacle the using its as an absorbent materials for Radar waves. These obstacles
are the high cost, bad mechanical properties and heavy weight, The solution is
prepareing a new composite material , its matrix is the kaolin and filled by Barium
ferrite. 5% and 15% of barium ferrite have enhanced the mechanical properties of
prepared a samples pressed at 69.4 Mρa and sintered at 1150 C˚ for two hours and
2ºC/min. and 3ºC/min as a heating and cooling rates respectively. The first
percentage has a (0.224) reflective index for 0.8 GHz and 2mm thickness and
(0.093) for 10.4 GHz and 2mm thickness.