The Experts below are selected from a list of 957 Experts worldwide ranked by ideXlab platform
Chellvarajoo Srivalli - One of the best experts on this subject based on the ideXlab platform.
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Nano Particle Reinforced Lead Free Sn–3.0ag–0.5cu Solder Paste For Reflow Soldering Process
2016Co-Authors: Chellvarajoo SrivalliAbstract:At present, researchers begin to reinforce Nanoparticles into Pb free solders to develop high efficiency nanocomposite solders. The effects on Nanoparticle Reinforcement into SAC 305 after reflow to enhance the solder joint quality are focus of this research. Consequently, this investigation developed into parametric case studies on different type of ceramic Nanoparticles (i.e., multielement oxide: Fe2NiO4, ITO; single element oxide: NiO, Fe2O3) and carbon-nanostructure (CN) particles (i.e., Diamond) as a manipulated variable (i.e., parameters) which are used to mechanically reinforce into SAC 305 solder alloys, respectively. The effects of these parameters on melting behavior, microstructures analysis (i.e., IMC thickness, Nanoparticles motion during reflow), spreading rate, wetting angle and solder hardness after reflow have been analyzed. The correlations between the reinforced Nanoparticles with the respective factors have been studied. From this research, it was identified that CN (i.e., Diamond) reinforced solder paste showed unique differences in the behavior and reached highest hardness with very little amount (i.e., 0.5wt.%) of Reinforcement among the type of Nanoparticles tested. As a result, diamond Nanoparticles were used to extend the parametric studies with the mechanical tests (i.e., shear test and pull test). The effects of both shear and pull strengths towards different amount of diamond Nanoparticles (0.01wt.%, 0.05wt.% and 0.1wt.%) with respective reflow profile were studied. The addition of 0.01wt.% diamond Nanoparticles in SAC 305 solder enhanced the PCBA shear and pull force by 7.4 % and 26.4 %, respectively. Hence, the current study generates a new expectation on CN based Nanoparticles to be reinforced in Pb free solder alloys to enhance package quality. The CN based Nanoparticles required in little amount to homogeneously mixed in SAC 305 solder alloys and contribute improvement in solder joint quality. Moreover, it indirectly reduced the production cost and allocates valuable directions for the engineers and researchers in upcoming microelectronics industry
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Nano Particle Reinforced Lead-Free Sn–3.0Ag–0.5Cu Solder Paste for Reflow Soldering Process
2016Co-Authors: Chellvarajoo SrivalliAbstract:Kini penyelidik mula menguatkan pateri tanpa plumbum dengan zarah nano bagi menghasilkan pateri komposit nano berkualiti tinggi. Kajian ke atas campuran pateri yang diperkuat nano dikehendaki oleh jurutera dan penyelidik bagi menyelesaikan masalah pateri terkini dan boleh meningkatkan kualiti sambungan pateri dan merupakan focus bagi penyelidikan ini. Justeru, penyelidikan ini menjalankan kajian kes ke atas perbezaan jenis zarah nano seramik (i.e., oksida pelbagai: Fe2NiO4, ITO; oksida unsur tunggal: NiO, Fe2O3) dan zarah karbon struktur nano (CN) (i.e. berlian) sebagai pemboleh-ubah yang dimanipulasikan, digunakan bagi menguatkan aloi pateri SAC 305 secara mekanik. Kesan parameter ini keatas kelakuan lebur, analisis struktur mikro (i.e., ketebalan IMC, pergerakan zarah nano semasa proses pateri aliran semula), kadar serakkan, sudut basah dan kekerasan pateri selepas proses pematerian aliran semula dianalisis. Korelasi diantara pateri yang diperkuat zarah nano dengan beberapa faktor telah dikaji. Ia telah dikenal-pasti bagi campuran pateri diperkuat CN (i.e., berlian) menunjukkan perbezaan ketara dalam kelakuan dan mencapai kekerasan tertinggi, dengan penambahan yang sedikit (i.e., 0.5wt.%) diperkuatkan berbanding dengan jenis zarah nano yang lain. Dengan keputusan ini, zarah nano berlian telah digunakan bagi kajian parameter lanjutan ke atas faktor kualiti (i.e., daya ricih dan tarikan). Kesan daya ricih dan tarikan bagi jumlah perbezaan zarah nano berlian yang digunakan (0.01wt.%, 0.05wt.% dan 0.1wt.%) dengan susuk aliran semula telah dikaji. Pengukuhan 0.01wt% zarah nano berlian bagi pateri SAC 305 meningkatkan daya ricih PCBA dan tarikan masing-masing sebanyak 7.4% dan 26.4%. Oleh itu, kajian ini menunjukkan keberhasilan baru keatas CN berdasarkan zarah nano yang diperkuatkan dalam pateri tuang tanpa plumbum bagi meningkatkan kualiti pakej. Zarah nano berdasarkan CN memerlukan hanya sedikit bagi dicampur secara serata dalam pateri tuang SAC 305 dan memberikan peningkatan ketara bagi kualiti sambungan pateri. Tambahan pula, secara tak langsung mengurangkan kos pengeluran dan memberikan arah berguna bagi jurutera dan penyelidik dalam industri mikroelektronik di masa yang akan datang. ________________________________________________________________________________________________________________________ At present, researchers begin to reinforce Nanoparticles into Pb free solders to develop high efficiency nanocomposite solders. The effects on Nanoparticle Reinforcement into SAC 305 after reflow to enhance the solder joint quality are focus of this research. Consequently, this investigation developed into parametric case studies on different type of ceramic Nanoparticles (i.e., multielement oxide: Fe2NiO4, ITO; single element oxide: NiO, Fe2O3) and carbon-nanostructure (CN) particles (i.e., Diamond) as a manipulated variable (i.e., parameters) which are used to mechanically reinforce into SAC 305 solder alloys, respectively. The effects of these parameters on melting behavior, microstructures analysis (i.e., IMC thickness, Nanoparticles motion during reflow), spreading rate, wetting angle and solder hardness after reflow have been analyzed. The correlations between the reinforced Nanoparticles with the respective factors have been studied. From this research, it was identified that CN (i.e., Diamond) reinforced solder paste showed unique differences in the behavior and reached highest hardness with very little amount (i.e., 0.5wt.%) of Reinforcement among the type of Nanoparticles tested. As a result, diamond Nanoparticles were used to extend the parametric studies with the mechanical tests (i.e., shear test and pull test). The effects of both shear and pull strengths towards different amount of diamond Nanoparticles (0.01wt.%, 0.05wt.% and 0.1wt.%) with respective reflow profile were studied. The addition of 0.01wt.% diamond Nanoparticles in SAC 305 solder enhanced the PCBA shear and pull force by 7.4 % and 26.4 %, respectively. Hence, the current study generates a new expectation on CN based Nanoparticles to be reinforced in Pb free solder alloys to enhance package quality. The CN based Nanoparticles required in little amount to homogeneously mixed in SAC 305 solder alloys and contribute improvement in solder joint quality. Moreover, it indirectly reduced the production cost and allocates valuable directions for the engineers and researchers in upcoming microelectronics industry
Y.c. Chan - One of the best experts on this subject based on the ideXlab platform.
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Improving the mechanical performance of Sn57.6Bi0.4Ag solder joints on Au/Ni/Cu pads during aging and electromigration through the addition of tungsten (W) Nanoparticle Reinforcement
Materials Science and Engineering A, 2016Co-Authors: Yi Li, Kaiming Luo, Adeline B.y. Lim, Fengshun Wu, Zhong Chen, Y.c. ChanAbstract:Sn57.6Bi0.4Ag solder has been reinforced successfully through the addition of tungsten (W) Nanoparticles at a concentration of 0.5 wt%. With the addition of W Nanoparticles, the solder matrix lamellar interphase spacing was reduced by 31.0%. Due to the dispersion of W Nanoparticles and the consequently refined microstructure, the mechanical properties of the solder alloy were enhanced, as indicated by a 6.2% improvement in the microhardness. During the reflow of solder on Au/Ni/Cu pads, the entire Au layer dissolved into the molten solder rapidly and a large number of (Au,Ni)(Sn,Bi)4particles were formed. The fracture path of the as-reflowed joint was within the solder region, showing ductile characteristic, and the shear strength was reinforced by 8.2%, due to the enhanced mechanical properties of the solder. During the subsequent aging process, the Au migrated back towards the interface and a thick layer of interfacial (Au,Ni)(Sn,Bi)4IMC was formed, leading to the shift of the fracture path to the interfacial IMC region, the transformation to brittle fracture and the deterioration of the strength of the joint, due to Au embrittlement. By adding W Nanoparticles, the migration of Au was mitigated and the thickness of the (Au,Ni)(Sn,Bi)4layer was reduced significantly, which reduced the Au embrittlement-induced deterioration of the strength of the joint. During electromigration, the segregation of the Bi-rich and Sn-rich phases and the accumulation of the (Au,Ni)(Sn,Bi)4layer at cathode interface were mitigated by the addition of W Nanoparticles, which improved the electromigration resistance.
Njuguna James - One of the best experts on this subject based on the ideXlab platform.
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The effect of nanosilica (SiO2) and nanoalumina (Al2O3) reinforced polyester nanocomposites on aerosol Nanoparticle emissions into the environment during automated drilling.
'Informa UK Limited', 2017Co-Authors: Starost Kristof, Frijns Evelien, Jo ,van Laer, Faisal Nadimul, Egizabal Ainhoa, Elizetxea Cristina, Nelissen Inge, Blázquez María, Njuguna JamesAbstract:The aim of this study is to investigate the effect nanosilica and nanoalumina has on Nanoparticle release from industrial nanocomposites due to drilling for hazard reduction whilst simultaneously obtaining the necessary mechanical performance. This study is therefore specifically designed such that all background noise is eliminated in the measurements range of 0.01 particles/cm3 and ±10% at 106 particles/cm3. The impact nano-sized SiO2 and Al2O3 reinforced polyester has on Nanoparticle aerosols generated due to drilling is investigated. Real-time measurement was conducted within a specially designed controlled test chamber using a condensation particle counter (CPC) and a scanning mobility particle sizer spectrometer (SMPS). The results show that the polyester nanocomposite samples displayed statistically significant differences and an increase in Nanoparticle number concentration by up to 228% compared to virgin polyester. It is shown that the nanofillers adhered to the polyester matrix showing a higher concentration of larger particles released (between 20–100nm). The increase in Nanoparticle Reinforcement weight concentration and resulting Nanoparticle release vary considerably between the nanosilica and nanoalumina samples due to the nanofillers presence. This study indicates a future opportunity to safer by design strategy that reduces number of particles released concentration and sizes without compromising desired mechanical properties for engineered polymers and composites
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The effect of nanosilica (SiO2) and nanoalumina (Al2O3) reinforced polyester nanocomposites on aerosol Nanoparticle emissions into the environment during automated drilling
'Informa UK Limited', 2017Co-Authors: Starost Kristof, Frijns Evelien, Jo ,van Laer, Faisal Nadimul, Egizabal Ainhoa, Elizetxea Cristina, Nelissen Inge, Blázquez María, Njuguna JamesAbstract:The aim of this study is to investigate the effect nanosilica and nanoalumina has on Nanoparticle release from industrial nanocomposites due to drilling for hazard reduction whilst simultaneously obtaining the necessary mechanical performance. This study is therefore specifically designed such that all background noise is eliminated in the measurements range of 0.01 particles/cm3 and ±10% at 106 particles/cm3. The impact nano-sized SiO2 and Al2O3 reinforced polyester has on Nanoparticle aerosols generated due to drilling is investigated. Real-time measurement was conducted within a specially designed controlled test chamber using a condensation particle counter (CPC) and a scanning mobility particle sizer spectrometer (SMPS). The results show that the polyester nanocomposite samples displayed statistically significant differences and an increase in Nanoparticle number concentration by up to 228% compared to virgin polyester. It is shown that the nanofillers adhered to the polyester matrix showing a higher concentration of larger particles released (between 20 – 100 nm). The increase in Nanoparticle Reinforcement weight concentration and resulting Nanoparticle release vary considerably between the nanosilica and nanoalumina samples due to the nanofillers presence. This study indicates a future opportunity to safer by design strategy that reduces number of particles released concentration and sizes without compromising desired mechanical properties for engineered polymers and composites.European Commission Life+ project named “Simulation of the release of nanomaterials from consumer products for environmental exposure assessment” (SIRENA, Pr. No. LIFE 11 ENV/ES/596). QualityNano Project through Transnational Access (TA Application VITO-TAF-382 and VITO-TAF-500) under the European Commission, Grant Agreement No: INFRA-2010-26216
Yi Li - One of the best experts on this subject based on the ideXlab platform.
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Improving the mechanical performance of Sn57.6Bi0.4Ag solder joints on Au/Ni/Cu pads during aging and electromigration through the addition of tungsten (W) Nanoparticle Reinforcement
Materials Science and Engineering A, 2016Co-Authors: Yi Li, Kaiming Luo, Adeline B.y. Lim, Fengshun Wu, Zhong Chen, Y.c. ChanAbstract:Sn57.6Bi0.4Ag solder has been reinforced successfully through the addition of tungsten (W) Nanoparticles at a concentration of 0.5 wt%. With the addition of W Nanoparticles, the solder matrix lamellar interphase spacing was reduced by 31.0%. Due to the dispersion of W Nanoparticles and the consequently refined microstructure, the mechanical properties of the solder alloy were enhanced, as indicated by a 6.2% improvement in the microhardness. During the reflow of solder on Au/Ni/Cu pads, the entire Au layer dissolved into the molten solder rapidly and a large number of (Au,Ni)(Sn,Bi)4particles were formed. The fracture path of the as-reflowed joint was within the solder region, showing ductile characteristic, and the shear strength was reinforced by 8.2%, due to the enhanced mechanical properties of the solder. During the subsequent aging process, the Au migrated back towards the interface and a thick layer of interfacial (Au,Ni)(Sn,Bi)4IMC was formed, leading to the shift of the fracture path to the interfacial IMC region, the transformation to brittle fracture and the deterioration of the strength of the joint, due to Au embrittlement. By adding W Nanoparticles, the migration of Au was mitigated and the thickness of the (Au,Ni)(Sn,Bi)4layer was reduced significantly, which reduced the Au embrittlement-induced deterioration of the strength of the joint. During electromigration, the segregation of the Bi-rich and Sn-rich phases and the accumulation of the (Au,Ni)(Sn,Bi)4layer at cathode interface were mitigated by the addition of W Nanoparticles, which improved the electromigration resistance.
Starost Kristof - One of the best experts on this subject based on the ideXlab platform.
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The effect of nanosilica (SiO2) and nanoalumina (Al2O3) reinforced polyester nanocomposites on aerosol Nanoparticle emissions into the environment during automated drilling.
'Informa UK Limited', 2017Co-Authors: Starost Kristof, Frijns Evelien, Jo ,van Laer, Faisal Nadimul, Egizabal Ainhoa, Elizetxea Cristina, Nelissen Inge, Blázquez María, Njuguna JamesAbstract:The aim of this study is to investigate the effect nanosilica and nanoalumina has on Nanoparticle release from industrial nanocomposites due to drilling for hazard reduction whilst simultaneously obtaining the necessary mechanical performance. This study is therefore specifically designed such that all background noise is eliminated in the measurements range of 0.01 particles/cm3 and ±10% at 106 particles/cm3. The impact nano-sized SiO2 and Al2O3 reinforced polyester has on Nanoparticle aerosols generated due to drilling is investigated. Real-time measurement was conducted within a specially designed controlled test chamber using a condensation particle counter (CPC) and a scanning mobility particle sizer spectrometer (SMPS). The results show that the polyester nanocomposite samples displayed statistically significant differences and an increase in Nanoparticle number concentration by up to 228% compared to virgin polyester. It is shown that the nanofillers adhered to the polyester matrix showing a higher concentration of larger particles released (between 20–100nm). The increase in Nanoparticle Reinforcement weight concentration and resulting Nanoparticle release vary considerably between the nanosilica and nanoalumina samples due to the nanofillers presence. This study indicates a future opportunity to safer by design strategy that reduces number of particles released concentration and sizes without compromising desired mechanical properties for engineered polymers and composites
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The effect of nanosilica (SiO2) and nanoalumina (Al2O3) reinforced polyester nanocomposites on aerosol Nanoparticle emissions into the environment during automated drilling
'Informa UK Limited', 2017Co-Authors: Starost Kristof, Frijns Evelien, Jo ,van Laer, Faisal Nadimul, Egizabal Ainhoa, Elizetxea Cristina, Nelissen Inge, Blázquez María, Njuguna JamesAbstract:The aim of this study is to investigate the effect nanosilica and nanoalumina has on Nanoparticle release from industrial nanocomposites due to drilling for hazard reduction whilst simultaneously obtaining the necessary mechanical performance. This study is therefore specifically designed such that all background noise is eliminated in the measurements range of 0.01 particles/cm3 and ±10% at 106 particles/cm3. The impact nano-sized SiO2 and Al2O3 reinforced polyester has on Nanoparticle aerosols generated due to drilling is investigated. Real-time measurement was conducted within a specially designed controlled test chamber using a condensation particle counter (CPC) and a scanning mobility particle sizer spectrometer (SMPS). The results show that the polyester nanocomposite samples displayed statistically significant differences and an increase in Nanoparticle number concentration by up to 228% compared to virgin polyester. It is shown that the nanofillers adhered to the polyester matrix showing a higher concentration of larger particles released (between 20 – 100 nm). The increase in Nanoparticle Reinforcement weight concentration and resulting Nanoparticle release vary considerably between the nanosilica and nanoalumina samples due to the nanofillers presence. This study indicates a future opportunity to safer by design strategy that reduces number of particles released concentration and sizes without compromising desired mechanical properties for engineered polymers and composites.European Commission Life+ project named “Simulation of the release of nanomaterials from consumer products for environmental exposure assessment” (SIRENA, Pr. No. LIFE 11 ENV/ES/596). QualityNano Project through Transnational Access (TA Application VITO-TAF-382 and VITO-TAF-500) under the European Commission, Grant Agreement No: INFRA-2010-26216
