간행물
한국분말야금학회 학술대회논문집
- 발행기관 한국분말재료학회(구 한국분말야금학회)
- 자료유형 학술대회
- 간기 부정기
- 수록기간 1993 ~ 2006
- 주제분류 공학 > 금속공학 공학 분류의 다른 간행물
- 십진분류KDC 559DDC 629
권호리스트/논문검색
한국분말야금학회 2006년도 추계학술대회논문집 (2006년 9월) 358건
281.
2006.09
구독 인증기관·개인회원 무료
Type I clathrate was produced by arc melting and hot pressing and thermoelectric properties were investigated. Negative Seebeck coefficient at all temperatures measured, which means that the majority carriers are electrons. Electrical conductivity decreased by increasing temperature and thermal conductivity was 0.012 W/cmK at room temperature and dimensionless thermoelectric figure of merit (ZT) was 0.01 at 873K.
282.
2006.09
구독 인증기관·개인회원 무료
Attempts have been made to describe the influence of production process parameters on the microstructure and properties of W-Ag and Mo-Ag composites. The compositions of powder mixtures are W+30% Ag and Mo+30%Ag. Silver additions assists densification during sintering by a liquid phase sintering process. The main goal of this work is to compare properties and microstructure of as-sintered and as-infiltrated composites.
283.
2006.09
구독 인증기관·개인회원 무료
284.
2006.09
구독 인증기관·개인회원 무료
Kwon, Dae-Hwan, Nguyen, Thuy Dang, Dudina, Dina, Kum, Jong-Won, Choi, Pyuck-Pa, Kim, Ji-Soon, Kwon, Young-Soon
Cu- nanocomposite powders were synthesized by combining high-energy ball-milling of Cu-Ti-B mixtures and subsequent self-propagating high temperature synthesis (SHS). Cu-40wt.% powders were produced by SHS reaction and ball-milled. The milled SHS powder was mixed with Cu powders by ball milling to produce Cu-2.5wt.% composites. particles less than 250nm were formed in the copper matrix after SHS-reaction. The releative density, electrical conductivity and hardness of specimens sintered at were nearly 98%, 83%IACS and 71HRB, respectively. After heat treatment at 850 to for 2 hours under Ar atmosphere, hardness was descedned by 15%. Our Cu- composite showed good thermal stability at eleveated temperature.
285.
2006.09
구독 인증기관·개인회원 무료
Kwon, Dae-Hwan, Kum, Jong-Won, Nguyen, Thuy Dang, Dudinad, Dina, Choi, Pyuck-Pa, Kim, Ji-Soon, Kwon, Young-Soon
Dispersion-strengthened copper with was produced by ball-milling and spark plasma sintering (SPS).Ball-milling was performed at a rotation speed of 300rpm for 30 and 60min in Ar atmosphere by using a planetary ball mill (AGO-2). Spark-plasma sintering was carried out at for 5min under vacuum after mechanical alloying. The hardness of the specimens sintered using powder ball milled for 60min at 300rpm increased from 16.0 to 61.8 HRB than that of specimen using powder mixed with a turbular mixer, while the electrical conductivity varied from 93.40% to 83.34%IACS. In the case of milled powder, hardness increased as milling time increased, while the electrical conductivity decreased. On the other hand, hardness decreased with increasing sintering temperature, but the electrical conductiviey increased slightly
286.
2006.09
구독 인증기관·개인회원 무료
We developed the copper core ball electroplated with Sn-Ag-Cu of the eutectic composition which used mostly as Pb free solder ball with high reliability. In order to search for the practicality of this developed copper core ball, the evaluation was executed by measuring the initial joint strength of the sample mounted on the substrate and reflowed and by measuring the joint strength of the sample after the high temperature leaving test and the constant temperature and the humidity leaving test. This evaluation was compered with those of the usual other copper core balls electroplated with (Sn,Sn-Ag,Sn-Cu,Sn-Bi) and the Sn-Ag-Cu solder ball.
287.
2006.09
구독 인증기관·개인회원 무료
A novel sintering process is proposed for bonding of and layers. Common commercial glass was used and infilterated among filler particles. As the kind of commercial glass, the phenomenon of the infilteration is different. Although Sud-1140 glass forms a glass/filler composite, it is not completely infilterated into the filler particles at . However as the increase of sintering temperature the infilteration of glass was improved. In this study, GA-1 and GA-12 glasses were infilterated the more than Sud-1140 glass. However, they are reacted by layer. The results of the experiment show that constrained sintering and the co-firing of the different materials were possible for glass infilteration using Sud-1140 glass at .
288.
2006.09
구독 인증기관·개인회원 무료
The electrophoretic deposition process of Ni nano-particles was employed for self-repairing of heat exchanger tubes. For electrophoretic deposition of Ni nano-particles on pitted Ni alloy specimen, a constant electric field of 100 V was applied to the specimen for 180 s in Ni-dispersed solution. It was found that as electrophoretic deposition proceeded, the size of the pit remarkably decreased due to the agglomeration of Ni nano-particles at the pit. This strongly suggests that the electrophoretic mobility of the charged particles is larger for the pit with a higher current value rather than outer surfaces with a lower current value.
289.
2006.09
구독 인증기관·개인회원 무료
The synthesis of silver coated iron base alloy (Sendust : Fe-Si-Al) powder having the both effects of shielding and suppressing of electromagnetic wave was studied. Depending on thickness of silver coating layer, the electromagnetic properties of the dispersed particles complexed with organic binder were examined. It is proposed that the silver coated sendust flake powders with controlled electrical properties and thickness can be used as thin microwave absorbers in quasi-microwave frequency band.
290.
2006.09
구독 인증기관·개인회원 무료
291.
2006.09
구독 인증기관·개인회원 무료
We investigated on the additive effect of carbon nanotube in the sulfur electrode on the first discharge curve and cycling property of lithium/sulfur cell. The sulfur electrode with carbon nanotube had two discharge plateau potentials and the first discharge capacity about 1200 mAh/g sulfur. The addition carbon nanotube into the sulfur electrode did not affect the first discharge behavior, but improved the cycling property of lithium/sulfur cell. The optimum content of carbon nanotube was 6 wt% of sulfur electrode
292.
2006.09
구독 인증기관·개인회원 무료
The shrinkage variation of Low Temperature Cofired Ceramics(LTCC) limits the size of the substrates that impose limitations on embedded passive components. This paper focuses on the method of minimizing or controlling planar shrinkage and reducing distortion during firing. The laminated sheets of alumina and glass were sintered at varying temperature, and depending on the amount of the glass ceramics. When the sintered of multi-layer structure with , the glass infiltrated entirely into layer at the temperature of about or higher.
293.
2006.09
구독 인증기관·개인회원 무료
[ ] powders for lithium ion batteries were synthesized from two separate raw material pairs of LiOH/MnO and . The powders prepared at 780 and and their difference of electrochemical properties were investigated. Both powders calcined at 780 and were composed of a single-phase spinel structure but those treated at showed a lower intensity ratio of to , a slightly larger lattice parameter, and an increased discharge capacity by 10% under voltage range. The XPS study on the oxidation states of manganese repealed that powders made from LiOH/MnO had less ion and gave better battery performances than those from .
294.
2006.09
구독 인증기관·개인회원 무료
295.
2006.09
구독 인증기관·개인회원 무료
296.
2006.09
구독 인증기관·개인회원 무료
The p-type Te functional gradient material (FGM) was fabricated by hot-pressing the mechanically alloyed and the 0.5 at% powders. Also, the n-type FGM was processed by hot-pressing the mechanically alloyed and the 0.3 wt% Bi-doped PbTe powders. With larger than , the p-type FGM exhibited larger thermoelectric output power than those of the and the 0.5 at% alloys. For the n-type FGM, the thermoelectric output power superior to those of the and the 0.3 wt% Bi-doped PbTe was predicted at larger than .
297.
2006.09
구독 인증기관·개인회원 무료
Non-electrolytic Deposition of Silver on Tungsten Powders for Functionally Gradient Composite Powder
Particles of high strength material when coated with silver offer a means of obtaining desirable electrical properties and high strength. The coating process employed aqueous ammoniacal silver-nitrate electrolytes with a formaldehyde solution as the reductant. Modifying additives were also applied. The reduction and subsequent deposition of silver occurred selectively on the surface of the tungsten particles. The morphologies of the coated particles were assessed by SEM imaging. The silver was uniformed coated on tungsten powder and its thickness was estimated to be approximately 100nm on the basis of a mass account.
298.
2006.09
구독 인증기관·개인회원 무료
The electrochemical properties of novel metal powders were investigated for the electrode materias of polymer electrolyte memebrane electrolysis. Two types of Pt black and powder electrodes were hot-pressed on the polymer electrolyte membrane to form membrane electrode assembly. The galvanodynamic polarization methode was used to characterize the electrochemical properties of both electrodes. From the experimental results, we concluded that the powder electrode exhibits better electrochemical performance than Pt black as cathode material for the electrolysis.
299.
2006.09
구독 인증기관·개인회원 무료
Adsorption isotherms of hydrogen by step-by-step method are widely used. However, the relations between the equations of state and the accumulated errors produced by step-by-step method and the mechanical errors of pressure or temperature controller were not analyzed. Considering the influence of various errors on the equations of state, we could find out the factors and compare the performance of the equations of state.
300.
2006.09
구독 인증기관·개인회원 무료
