Kahtan Sadiq Muhammed, Dr.http://dspace.unimap.edu.my:80/xmlui/handle/123456789/342312024-03-28T16:58:17Z2024-03-28T16:58:17ZEffect of aging temperature on the intermetallic compound (IMC) formation of Sn-0.7Cu/Si3N4 composite solderMohd Arif Anuar, Mohd SallehNoraniza, SaudNajib Saedi, Ibrahimhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/348732016-12-01T01:36:32Z2013-01-01T00:00:00ZEffect of aging temperature on the intermetallic compound (IMC) formation of Sn-0.7Cu/Si3N4 composite solder
Mohd Arif Anuar, Mohd Salleh; Noraniza, Saud; Najib Saedi, Ibrahim
Nowadays, excessive growth intermetallic formation becomes the major issue in electronic packaging industry. The investigation on the effect of aging temperature to the intermetallic compound (IMCs) growth formation for Sn-0.7Cu/1.0-Si3N4 was studied. Isothermal aging process was carried out for 24 hours, with 5 difference aging temperature from 50°C up to 150°C. It is found that the Cu-Sn IMCs which appear after reflowed process, has grew rapidly when aging temperature was increased up to 125°C and started to reduced after 150°C aging temperature.
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2013-01-01T00:00:00ZRadiation shielding characteristics of concretes incorporates different waste materialsAli Basheer, AzeezKahtan Sadiq, Muhammed, Dr.Mohd Mustafa Al Bakri, AbdullahHana, Ihsan Hasanhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/345082014-05-19T08:28:23Z2014-01-01T00:00:00ZRadiation shielding characteristics of concretes incorporates different waste materials
Ali Basheer, Azeez; Kahtan Sadiq, Muhammed, Dr.; Mohd Mustafa Al Bakri, Abdullah; Hana, Ihsan Hasan
Samples of concrete incorporate different waste materials such as iron filings, iron balls of used ball bearings and slags from steel industry were assessed for their anti-radiation attenuation coefficient properties. The attenuation measurements were performed using gamma spectrometer of NaI (Tl) detector. The utilized radiation sources comprised Cs¹³⁷ and Co⁶⁰ radioactive elements with photon energies of o.662 MeV for Cs¹³⁷ and two1.17 and 1.33 MeV energy levels for the Co⁶⁰. Likewise the mean free paths for the tested samples were obtained. The maximum linear attenuation coefficient values of 0.92±1.12×10¯³ for CS¹³⁷ and 1.12±1.57×10¯³ for CO⁶⁰ attained, in this study were for concrete incorporate iron filling wastes of 30 wt. %. The iron balls and the steel slags gave much inferior values. The concrete incorporates iron filings provided the best shielding effect. The microstructure, concretefillings composite density, the homogeneity and particulate distribution were examined and evaluated using different metallographic, microscopic and measurement facilities.
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2014-01-01T00:00:00ZThe need to intensify research efforts in the alternative to lead shotBaba GowonKahtan S., Mohammed, Dr.Shamsul Baharin, Jamaludin, Prof. Dr.Alida, Abdullahhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/342522014-05-05T06:49:23Z2014-01-01T00:00:00ZThe need to intensify research efforts in the alternative to lead shot
Baba Gowon; Kahtan S., Mohammed, Dr.; Shamsul Baharin, Jamaludin, Prof. Dr.; Alida, Abdullah
The problem of lead poisoning resulting from the use of lead shot in hunting waterbirds and shooting sports has led to the partial ban, voluntary restriction and complete ban of lead shot in some countries. The ban resulted in the alternatives like copper shot, tungsten-tin shot, bismuth-tin, steel shot, etc. These alternatives are still expensive and other possible alternatives have not been explored up to date. There is therefore need to ban lead shot world-wide and step up research into the alternatives (green shot).
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2014-01-01T00:00:00ZSelf-compacting high density tungsten-bronze compositesKahtan S, Muhammed, Dr.Azmi, Rahmat, Prof.Azizan, Aziz, Assoc. Prof. Dr.http://dspace.unimap.edu.my:80/xmlui/handle/123456789/331582014-03-27T04:21:28Z2013-07-01T00:00:00ZSelf-compacting high density tungsten-bronze composites
Kahtan S, Muhammed, Dr.; Azmi, Rahmat, Prof.; Azizan, Aziz, Assoc. Prof. Dr.
Green compacts of W–bronze were encapsulated in shells of bronze powder, placed in a ceramic mold and sintered in alumina tube furnace at 1150 °C. Throughout the sintering cooling stage the differential coefficient of thermal expansion ΔCTE of W–bronze was employed to induce an external compressive densification action. The process included simultaneous sintering, hot isostatic pressing (HIP) and infiltration act to enhance densification. By this technique, pilot sintered compacts of different W50–80 wt.%–pre-mix bronze of 97–99% theoretical density were produced. This process resulted in compacts of higher hardness, higher sintered density and better structure homogeneity as opposed to similar compacts densified by the conventional sintering process. The results showed a gain in hardness by 10–20% and in density by 5–15%. The impact of different cooling rates of 3, 4, 8 and 30 °C min−1 on sintered density, microstructure and densification mechanisms was examined and evaluated. Low cooling rates of 3 and 4 °C min−1 gave the best results.
Link to publisher's homepage at http://www.elsevier.com
2013-07-01T00:00:00Z