Joint Analysis and Reliability Test of Epoxy-Based Nano Silver Paste Under Different Pressure-Less Sintering Processes

2022 ◽  
Author(s):  
Xinyue Wang ◽  
Zejun Zeng ◽  
Guoqi Q. Zhang ◽  
Jing Zhang ◽  
Pan Liu
Keyword(s):  
Substrate Surface ◽  
Influence Factors ◽  
Holding Time ◽  
Joint Analysis ◽  
Processing Temperature ◽  
Silver Paste ◽  
Bonding Properties ◽  
Chip Size ◽  
Stress Damage ◽  
Sintered Silver

Abstract Recent years, the sintered silver paste was introduced and further developed for power electronics packaging due to low processing temperature and high working temperature. The pressure-less sintering technology reduces the stress damage caused by the pressure to the chip, improves reliability, and is widely applied in manufacturing. Currently, most existed studies are focused on alcohol-based sintered silver pastes while resins have been demonstrated to improve the bonding properties of solder joints. Hence, the performance and sintering mechanisms with epoxy-based silver paste need to be further explored. In this work, a methodology for multi-factor investigation is settled on the epoxy-based silver paste to reveal the relationship between the strength and the different influence factors. We firstly analyzed the characteristics of commercialized epoxy-based silver paste samples, including silver content, silver particle size, organic paste composition, sample viscosity, and thermal conductivity. Samples were then prepared for shear tests and microstructure analysis under different pressure-less sintering temperatures, holding time, substrate surface, and chip size. Full factor analysis results were further discussed in detail for correlation. The influence factors were ranked from strong to weak as follows: sintering temperature, substrate surface, chip size, and holding time. Finally, a thermal cycling test was carried out for reliability analysis. Epoxy residues are one of the possible reasons which result in shear strength decreasing exponentially.

Characterizations of Removal Rate and Temperature in the Inductively Coupled Plasma Etching of Silicon Carbide

2016 ◽  
Vol 679 ◽  
pp. 85-90
Author(s):  
Na Li ◽  
Peng Zhang ◽  
Qiang Xin ◽  
Jiang Jin ◽  
Bo Wang
Keyword(s):  
Silicon Carbide ◽  
Inductively Coupled Plasma ◽  
Processing Time ◽  
Removal Rate ◽  
Influence Factors ◽  
High Hardness ◽  
Input Power ◽  
Processing Temperature ◽  
Space Applications ◽  
Inductively Coupled

Silicon carbide (SiC) is widely used in terrestrial and space applications because of its good mechanical, thermal and optical properties. Nevertheless, traditional grinding and polishing technologies cannot meet the machining requirements due to the high hardness and brittleness. In this paper, Inductively Coupled Plasma (ICP) is utilized to process the SiC optics. The effects of different processing recipes on the removal rate and temperature are investigated. The results show that the removal rate almost keeps stable with processing time and changes with the flow rate of plasma gas, reaction gas, the ratio of CF4/O2 and the power. The input power and processing time are the two main influence factors on the processing temperature.

A Study on the Carbon Nitriding Process of BF Slag Containing Titanium

2013 ◽  
Vol 631-632 ◽  
pp. 511-517
Author(s):  
Liang Li ◽  
Jun Wang ◽  
Xing Ping Fan
Keyword(s):  
Phase Composition ◽  
Influence Factors ◽  
Holding Time ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbon And Nitrogen ◽  
Slag Particle ◽  
Bf Slag ◽  
Ore Dressing ◽  
Titanium Magnetite

The experiment was done in which the BF slag containing titanium produced by Pangang with vanadium-titanium magnetite was dealt with carbon and nitrogen. The possibility of the carbon nitriding reactions were analyzed theoretically. It is found by thermodynamic calculation that the carbon nitriding of TiO2 is easier than that of other oxides and the temperature of carbon nitriding of perovskite can be reduced with the presence of Al2O3 and SiO2 in slag. The phase composition and microstructure of production from carbon nitriding were studied using X-ray diffraction and SEM. It is approved that the main phase composition of production from carbon nitriding under N2 was Ti(C,N). The influence factors, temperature, holding time and particle size were investigated. The results show, the phase compositions of the slag is mainly perovskite; the most suitable temperature and holding time of carbon nitriding is about 1450°C; the most appropriate holding time was about 2 hours and the most suitable size of the slag particle is about 180 meshes. With the optimization of the process, the size of Ti(C,N) can be increased which will benefit the recycle of Ti(C,N) in ore dressing.

scholarly journals Effect of Surface Shape and Content of Steel Fiber on Mechanical Properties of Concrete

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Lijuan Zhang ◽  
Jun Zhao ◽  
Cunyuan Fan ◽  
Zhi Wang
Keyword(s):  
Mechanical Properties ◽  
Steel Fiber ◽  
Influence Factors ◽  
Fiber Reinforced Concrete ◽  
Surface Shape ◽  
Test Results ◽  
Steel Fiber Reinforced Concrete ◽  
Bonding Properties ◽  
Concrete Matrix ◽  
Effect Of Surface

Steel fiber reinforced concrete (SFRC) has gained popularity in the last decades attributed to the improvement of brittleness and low tensile strength of concrete. This study investigates the effect of three shapes of steel fibers (straight, hooked end, and corrugated) with four contents (0.5%, 1%, 1.5%, and 2%) on the mechanical properties (compression, splitting tension, shear, and flexure) of concrete. Thirteen groups of concrete were prepared and investigated experimentally. Test results indicated that steel fiber had significant reinforcement on mechanical properties of concrete. When the steel fiber content increases from 0.5% to 2.0%, the compressive strengths increase about 4–24%, splitting tensile strengths increase about 33–122%, shear strengths increase about 31–79%, and flexural strengths increase about 25–111%. Corrugated steel fiber has the best reinforced effect on strength of SFRC, hooked end steel fiber takes the second place, and straight steel fiber is the least. Calculated formulas of compressive, splitting tensile, shear, and flexural strengths were established with consideration of the bonding properties between concrete and steel fiber. Influence factors of steel fiber αf and concrete matrix strength αc were put forward and determined by regression analysis of experimental data. Calculated results agree well with the experimental results.

Effects of Na-Ca System Glass Powder on Properties of Silver Paste

2013 ◽  
Vol 833 ◽  
pp. 295-300
Author(s):  
Mao Yan Fan ◽  
Guo You Gan ◽  
Jian Hong Yi ◽  
Ji Kang Yan ◽  
Jing Hong Du ◽  
...  
Keyword(s):  
Particle Size ◽  
Glass Powder ◽  
Silver Film ◽  
Sintering Temperature ◽  
Holding Time ◽  
Binder Phase ◽  
Powder Size ◽  
Silver Paste ◽  
Powder Content

The glass powder as a binder phase in the silver paste mainly plays the role of binding. The composition, content and particle size of the glass powder have significant effects on the properties of the silver paste. In this paper, the effects of the sintering temperature, holding time, glass powder content and glass powder size on the adhesion and square resistance of the silver film were studied. The research results showed that when the glass powder content was 6%(in mass) of the total silver paste, the sintering temperature was 680°C, the holding time was 7 minutes and the glass powder size was 2.47μm, the silver paste can get good properties. The adhesion strength and square resistance of the silver film were respectively 2.5 N/mm2 and 14 mΩ /.

Influence Factors and Prediction Model of Viscosity for Crumb Rubber Modified Asphalt

2013 ◽  
Vol 723 ◽  
pp. 376-380 ◽  
Author(s):  
Zhan Ding ◽  
Yang Zhi Zhu ◽  
Shuang Wu ◽  
Ding Li Lv
Keyword(s):  
Prediction Model ◽  
High Speed ◽  
Influence Factors ◽  
Quadratic Function ◽  
Crumb Rubber ◽  
High Viscosity ◽  
Processing Temperature ◽  
Modified Asphalt ◽  
Stirring Time ◽  
Function Relationship

To reuse waste rubber tires is a global issue. One method of reusing tires is to process them into crumb-sized particles and produce crumb rubber modified asphalt (CRMA), which is a an effective way of reducing the pollution and resource utilization. Rotary viscosities of CRMA prepared under different conditions were measured to analyze the effects of treating methods, treating temperature, crumb rubber size, treating time and rubber dosage on the viscosity of CRMA. And a prediction model of viscosity of CRMA was developed. Test results indicate that, using the high-speed stirring method, viscosity of CRMA (η) appears quadratic function relationship with processing temperature (T) and crumb rubber mesh (D), exponential relation with the dosage of crumb rubber (R), but has no significant rule with the stirring time. By regression analysis, prediction model of viscosity of CRMA has a high viscosity fitting accuracy, which can provide a reference for production process of CRMA.

scholarly journals Tris-{Hydridotris(1-pyrazolyl)borato}lanthanide Complexes: Synthesis, Spectroscopy, Crystal Structure and Bonding Properties

Inorganics ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 44
Author(s):  
Christos Apostolidis ◽  
Attila Kovács ◽  
Alfred Morgenstern ◽  
Jean Rebizant ◽  
Olaf Walter
Keyword(s):  
Density Functional ◽  
Structural Parameters ◽  
Joint Analysis ◽  
Energy Decomposition ◽  
X Ray Diffraction ◽  
Functional Theory ◽  
X Ray ◽  
Coordination Sites ◽  
Bonding Properties ◽  
Straightforward Interpretation

Complexes of trivalent lanthanides (Ln) with the hydridotris(1-pyrazolyl)borato (Tp) ligand Ln[η3-HB(N2C3H3)3]3 (LnTp3) were subjected to a joint experimental–theoretical analysis. X-ray diffraction experiments have been performed on CeTp3, NdTp3, SmTp3, GdTp3, and TbTp3 in the nine-fold coordination and on DyTp3, HoTp3, ErTp3, TmTp3, YbTp3, and LuTp3 in the eight-fold coordination form. Density functional theory (DFT) calculations were carried out for all 15 LnTp3 complexes. They extended the X-ray diffraction data available on the LnTp3 compounds and facilitated a straightforward interpretation of trends in the structural parameters. As a result of the joint analysis, significant steric strain in the equatorial coordination sites of the nine-coordinate structures was recognized. Trends in the bonding properties were elucidated by energy decomposition and quantum theory of atoms in molecules (QTAIM) analysis of the electron density distribution. These results revealed the major electrostatic character of the Ln…Tp bonding and fine variation of charge transfer effects across the Ln row.

Relationship of Post Treatment Temperature and Tensile Strength for Selective Laser Sintering

2012 ◽  
Vol 155-156 ◽  
pp. 872-876 ◽  
Author(s):  
Jun Su ◽  
Xiao Jing Li ◽  
Pei Xin Qu
Keyword(s):  
Tensile Strength ◽  
Selective Laser Sintering ◽  
Research Result ◽  
Influence Factors ◽  
Past Research ◽  
Laser Sintering ◽  
Treatment Temperature ◽  
Processing Temperature ◽  
Post Processing ◽  
Coated Sand

Though SLS technology have got well development, the strength of the sintering prototype parts still need a lot of research. The lower strength of prototype parts mightl seriously affect the quality. The past research result shows that intensity of coated sand specimens of SLS sintering method is lower and cannot be used for metal casting, the sintered parts must be post-processed. In this study, author used the coated sand casting as the material of selective laser sintering experiment, studied the processing temperature and time on the mechanical properties of post-processing, and the influence on gas-forming property and collapsibility of the pieces. And combined with casting experimental to analyze the accuracy influence factors of precoated sand sintering parts and other performance assessment. Through the above analysis, we concluded that the influence law the post-processing of temperature on tensile strength of coated sand specimens under three different insulation temperature conditions.

Optimization of Ultrathin ALD Tantalum Nitride Films for Zero-Thickness Liner Applications

2002 ◽  
Vol 716 ◽  
Author(s):  
Oscar van der Straten ◽  
Yu Zhu ◽  
Eric Eisenbraun ◽  
Alain Kaloyeros
Keyword(s):  
Film Growth ◽  
Substrate Surface ◽  
Performance Testing ◽  
Atomic Layer ◽  
Tantalum Nitride ◽  
Copper Metallization ◽  
Processing Temperature ◽  
Layer Deposition ◽  
Metal Organic ◽  
Substrate Independent

AbstractA metal-organic atomic layer deposition (ALD) tantalum nitride process has been demonstrated for zero-thickness liner applications in advanced copper metallization schemes. Utilizing a commercially available ALD reactor, this process employs a liquid tantalum source (tertbutylimido tris(diethylamido) tantalum—TBTDET) and ammonia as the reactants. Key functionality data addressing the self-limiting nature of ALD film growth with respect to key process parameters including processing temperature and the substrate surface exposures to TBTDET and ammonia have been obtained, leading to the establishment of an optimized ALD processing window. Highly conformal, continuous, and smooth growth over high aspect ratio structures is exhibited, and incubation periods appear to be relatively substrate independent. Preliminary thermal and electrical copper barrier performance testing of the deposited films indicates that they hold promise for use in emerging nanoscale interconnect applications.

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