Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : SiC


Effect of Heat Treatment on Corrosion Behavior of Al-4Ti/MgO-SiC Composite

Rana A. Anaee; Wafaa Mahdi Salih; Ban Farhan Dawood

Engineering and Technology Journal, 2016, Volume 34, Issue 14, Pages 2720-2726

This work focuses on the effect of annealing, normalizing and tempering on corrosion behavior of Al-4Ti/1 wt% MgO-2 wt% SiC composite fabricated by stir casting method. The XRD analysis and optical examination indicate that the heat treatments lead to breaking up the main phase (Al3Ti) in Al-4Ti alloy and form many oxides that cover the composite surface.
Linear and cyclic polarizations have been investigated in seawater at room temperature by Potentiostat. The corrosion data showed that the corrosion potential became more negative for heat treated composites compared with untreated once. Corrosion current density decreased after heat treatments. The normalized composite has lowest corrosion rate due to expose the specimen to atmosphere for quenching which leads to form SiO2 in addition to MgO and Al2O3. The breakdown of passive layer in composite decreased by heat treatments which assessed by cyclic polarization test.

Studying the Dry Sliding Wear for Composite Material of Base (Al-4%Cu) Reinforcement by Silicon Carbide Particles

Ahmad Ali Akbar Akbar; Hijran Zinalabiden; Waleed T. Rashid

Engineering and Technology Journal, 2014, Volume 32, Issue 6, Pages 186-195

This work is concerned with a study of dry sliding wear of Aluminum bace alloy of (Al-4%Cu) reinforcement by silicon carbide particles with different percentage (3, 6,9,12 wt %SiC). Composite materials prepared by stir casting method using vortex technique. The base alloy and composite materials samples were tested to investigate wear behavior, using Pin -on-Disc technique, by examining some variables of wear such as applied load, sliding speed, and sliding time. The results showed that wear rate increases with applied load and sliding time, while increasing the sliding speed and the percentage of SiC decreases the wear rate, as well as the alloy containing (12wt% SiC) showed better wear resistance compared with other alloys .

Studying the Effect of Chemical Solution on Corrosion Behavior of SiC and Al2O3 Reinforced Aluminum Composite Materials

Nervana A. Abd Alameer

Engineering and Technology Journal, 2011, Volume 29, Issue 15, Pages 3194-3203

Corrosion behavior of aluminum matrix composites (MMCs) with (10, 20 &30) weight fraction of each alumina and silicon carbide was investigated in 10% (NaCl, NaOH &HCl) solutions at different temperatures (40, 60, 80 &100) °C also at room temperature. The results showed the corrosion rate was increased with increasing in
weight fraction of alumina and silica as reinforcement due to discontinues protective film in addition to increasing in temperatures at 10 % HCl solution, it reached (8.252 mpy) by reinforced with SiC. Alumina was exhibited corrosion resistant better than
SiC due to it is insulator; galvanic corrosion occurs when incorporation of semiconductor SiC only. Specimens were exposed to NaOH solution, aluminum reinforced with Al2O3 and SiC appears poor corrosion resistance. Finally, the results of effect NaCl were investigated, appeared an increase in corrosion rate with increasing in time.

The Mechanical Properties of Aluminum Matrix Composites

Engineering and Technology Journal, 2009, Volume 27, Issue 15, Pages 517-523

This work is production of aluminum matrix composite by powder metallurgy method .The samples have done when aluminum powder was used as a matrix in purity of (9.99%) and silicon carbide(α-SiC) as reinforcement material, the particle sizes were used which (125μm) at weight percentage (7.5% - 10% - 15%) from silicon carbide for each particle size. The purpose is to improve the hardness and wear properties of matrix .It was found that the hardness is increased with increment of the amount of added particles, due to the hardness of silicon carbid particles. From the wear test, it is found that the wear resistance increase with increasing the weight percentage of SiC particles, but the wear rate increase when the applied load increase for all the particles size and additional percentage. Also, it is found that when the sliding velocity increases, the wear rate also increases, but the best results were found in samples reinforced with (SiC) particles

Effect of Dual Reinforcement on Wear Resistance by Aluminum Compacts Reinforce by SiC, Al2O3

Mohammed Moanes Ezzaldean Ali; Hanan A. R. Akkar; A. K. M. AL-Shaikhli; Ali K. Shayyish; Muhsin J. Jweeg; Wisam Auday Hussain; Mohammed T. Hussein; Mohammad A. Al-Neami; Farah S. Al-Jabary; Jafar M. Hassan; Ali H. Tarrad; Mohammed N. Abdullah; Ahmed T. Mahdi; Eyad K. Sayhood; Husain M. Husain; Nidaa F. Hassan; Rehab F. Hassan; Akbas E. Ali; Assim H Yousif; Kassim K Abbas; Aqeel M Jary; Shakir A. Salih; Ali T. Jasim; Ammar A. Ali; Hosham Salim; JafarM. Daif; Ali H. Al Aboodi; Ammar S. Dawood; Sarmad A. Abbas; Salah Mahdi Saleh; Roshen T. Ahmed; Aseel B. Al-Zubaidi; Mohammed Y. Hassan; Majid A. Oleiwi; Shaimaa Mahmood Mahdy; Husain M. Husain; Mohammed J. Hamood; Shaima; a Tariq Sakin

Engineering and Technology Journal, 2009, Volume 27, Issue 13, Pages 423-429

The producing composite materials of dual reinforcement in which the matrix material is aluminum reinforced with two types of ceramic particles : which are Alumina (50μm

Keywords

composite materials; wear test ; Al2O3; SiC: Al

In-nSiC schottky photodiode ; Fabrication and Study

Khalid Z. Yahiya; Ammar H. Jraiz; Abdulla Khudiar Abass

Engineering and Technology Journal, 2008, Volume 26, Issue 9, Pages 1110-1115

In the present work , schottky photodiode have been mode on n-type SiC
by depositing of thin layer of In . electrical characteristics included I-V
(dark and illumination ) have been investigated . Ideality factor is 1.6 and
barrier height is 0.53 eV was calculated from I-V and Isc-Voc
characteristics, Ideality factor is 1.7 and barrier height found to be 0.64 eV,
and from optoelectronic characteristics have found sensitivity results show
that peak response of photodiode was 550nm .