• 제목/요약/키워드: low temperature firing

검색결과 184건 처리시간 0.028초

저온 소성용 유리-알루미나 복합체에서 유리 입자크기에 따른 소결거동 (Effects of Glass Particle Size on Sintering Behaviors of the Glass-Alumina Composites for Low Firing Temperature)

  • 박덕훈;김봉철;김정주;박이순
    • 한국세라믹학회지
    • /
    • 제37권6호
    • /
    • pp.545-551
    • /
    • 2000
  • Sintering behaviors of the glass-alumina composites for low firing temperature were investigated as a function of the particle size of glass frit. The system of glass frit was Pb-B-Si-Al-O. The median particle sizes of the glass frits were 2.72$\mu\textrm{m}$, 2.67$\mu\textrm{m}$ and 1.33$\mu\textrm{m}$, which were prepared with changing ball-milling times as 24 h, 48 h and 96 h. The glass-alumina composites showed maximum density at certain temperature, and further heating led to dedensification behaviors, so called over-firing. The sintering temperature, which showed maximum density, raised from 425$^{\circ}C$ to 475$^{\circ}C$ with increase of particle size of glass frit from 1.33$\mu\textrm{m}$ to 2.72$\mu\textrm{m}$. Especially, the over firing behaviors, which were occurred at high sintering temperatures, were greatly increased with decrease of particle size of glass frit.

  • PDF

저온 소결제 첨가에 의한 LiNb3O8-TiO2계 세라믹스의 마이크로파 유전 특성 (Microwave Dielectric Properties of the LiNb3O8-TiO2 Ceramic System with the Addition of Low Firing Agents)

  • 최명호;김남철
    • 한국전기전자재료학회논문지
    • /
    • 제21권6호
    • /
    • pp.517-523
    • /
    • 2008
  • The microwave dielectric properties of $LiNb_3O_8-TiO_2$ based ceramics with low firing agents, CuO, $Bi_2O_3$, $B_2O_3$, $SiO_2$, $TiO_2$, were investigated to improve the sintering condition for the LTCC system. According to the X-ray diffraction and SEM, the ceramics of $LiNb_3O_8-TiO_2$ with low firing agents showed no significant second phases within a range of experiments, and fine microstructures. By adding the low firing agents, the sintering temperature decreased from $1200^{\circ}C$ to $925^{\circ}C$. Based on the results of electrical measurements, the $LiNb_3O_8-TiO_2$ ceramics showed a promising microwave dielectric properties for LTCC applications, those are ${\varepsilon}_r$ (dielectric constant) = 44, Q f (quality factor) = 18000, and ${\tau}_f$ (the temperature coefficient of resonant frequency) = $-1.5\;ppm/^{\circ}C$.

저온소성 기판과 Cu와의 동시소성에 미치는 CuO의 첨가효과 (The Influence of CuO on Bonding Behaviors of Low-Firing-Substrate and Cu Conductor)

  • 박정현;이상진
    • 한국세라믹학회지
    • /
    • 제31권4호
    • /
    • pp.381-388
    • /
    • 1994
  • A new process which co-fires the low-firing-substrate and copper conductor was studied to achieve good bond strength and low sheet resistance of conductor. Cupric oxide is used as the precursor of conductive material in the new method and the firing atmosphere of the new process is changed sequently in air H2N2. The addition of cupric oxide and variations of firing atmosphere permited complete binder-burnout in comparison with the conventional method and contributed to the improvement of resistance and bonding behaviors. The potimum conditions of this experiment to obtain the satisfactory resistance and bond strength are as follows (binder-burnout temperature in air; 55$0^{\circ}C$, reducing temperature in H2; 40$0^{\circ}C$ for 30 min, ratio of copper and cupric oxide; 60:40~30:70 wt%). The bonding mechanism between the substrate and metal was explained by metal diffusion layer in the interface and the bond strength mainly depended on the stress caused by the difference of shrinkage and thermal expansion coefficient between the substrate and metal.

  • PDF

면광원용 저온 소성형 형광체 Paste 특성 연구 (A Study on the Characteristics of Low Temperature Firing Phosphor Paste for Flat Light Source)

  • 이동욱;남수용
    • 한국인쇄학회:학술대회논문집
    • /
    • 한국인쇄학회 2007년도 추계 학술논문 발표회
    • /
    • pp.75-81
    • /
    • 2007
  • As manufacturing the low temperature firing paste applicable flat light source for LCD BLU, this study examined the specific quality. For the phosphor pastes, the low temperature firing acryl resin is used as the binder resin. As the result of thermal decomposition characteristics, residual hydroxylcarbon rested under 0.1wt% on 400$^{\circ}C$. With the manufactured paste in this study, the flat light source device is manufactured through the screen printing and it brought the almost 100% of special quality radiation about the phosphor brightness.

  • PDF

저온 소성용 유리-알루미나 복합체에서 알루미나의 부피분율과 입자크기에 따른 소결 거동 (Effects of Volume Fraction & Particle Size of Alumina on Sintering Behaviors of the Glass-Alumina Composites for Low Firing Temperature)

  • 박덕훈;김봉철;김정주;박이순
    • 한국세라믹학회지
    • /
    • 제37권7호
    • /
    • pp.638-644
    • /
    • 2000
  • The sintering behaviors of the glass-alumina composites for low firing temperature were investigated as functiions of the volume fraction of alumina powder and the particle size with respect to porosity and pore shape. As the volume fraction of alumina powder was increased or the particle size of it was decreased, the sintering temperature of open pore-closing was raised. When the volume fractions of alumina which had 2.19$\mu\textrm{m}$ median diameter were increased with 20, 30, 40, and 50%, the sintering temperatures of open pore-closing were 425, 450, 475, and 500$^{\circ}C$. And when the median particle size of alumina was diminished from 2.19$\mu\textrm{m}$ to 0.38$\mu\textrm{m}$, the sintering temperature of open pore-closing was increased from 450$^{\circ}C$ to 475$^{\circ}C$. Especially, the sintering temperature, which showed maximum density, was corresponded with the stage of open pore-closing and after achieving maximum density over heating resulted in dedensification of specimen, so called, over-firing behavior.

  • PDF

PDP용 Ag 전도성 후막의 열적거동 (Thermal Behaviors of Ag Conductive Thick Film with Firing Temperature for Plasma Display Panel)

  • 황성진;이상욱;김형순
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
    • /
    • pp.278-278
    • /
    • 2007
  • Ag conductive thick film has been used in bus and address electrodes of PDP (Plasma display panel). In PDP fabrication, the firing temperature of electrode is normally $550{\sim}580^{\circ}C$. For the application of PDP industry, we investigated an Ag conductive thick film with firing temperature. Low melting glass frit was used in the conductive thick film. The thermal properties of Ag and frit were determined by a hot stage microscopy. Based on the our results, we suggest that the Ag conductive thick film should be considered of the firing temperature which is correlated to the shrinkage, conductivity, and shape of thick film.

  • PDF

Tape Casting에 의한 fluormica계 제조 및 특성 저온 소결 기판의 제조 및 특성 (Fabrication and Characteristics of Low Temperature Firing Substrate by Tape Casting in Fluormica System)

  • 박대현;최정헌;강원호;김병익
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 1999년도 춘계학술대회 논문집
    • /
    • pp.673-676
    • /
    • 1999
  • We fabricated green sheet by tape casting method with fluormica glass-ceramic powders for fabrication of low temperature co-firing substrate. After ball milling with organic additives, we investigated green strength and density of green sheets which were casted by doctor blade machine. Green sheets were sintered at 700 ~ 1,00$0^{\circ}C$ for 1 ~3hrs. Microstructure, linear shrinkage and dielectric constant of substrates were surveyed.

  • PDF

고효율 후면 전극형 태양전지를 위한 나노 Paste의 적용에 대한 연구 (The application of Nano-paste for high efficiency back contact Solar cell)

  • 남동헌;이규일;박용환
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 한국신재생에너지학회 2010년도 추계학술대회 초록집
    • /
    • pp.53.2-53.2
    • /
    • 2010
  • In this study, we focused on our specialized electrode process for Si back-contact crystalline solar cell. It is different from other well-known back-contact cell process for thermal aspect and specialized process. In general, aluminum makes ohmic contact to the Si wafer and acts as a back surface reflector. And, silver is used for low series resistance metal grid lines. Aluminum was sputtered onto back side of wafer. Next, silver is directly patterned on the wafer by screen printing. The sputtered aluminum was removed by wet etching process after rear silver electrode was formed. In this process, the silver paste must have good printability, electrical property and adhesion strength, before and after the aluminum etching process. Silver paste also needs low temperature firing characteristics to reduce the thermal budget. So it was seriously collected by the products of several company of regarding low temperature firing (below $250^{\circ}C$) and aluminum etching endurance. First of all, silver pastes for etching selectivity were selected to evaluate as low temperature firing condition, electrical properties and adhesive strength. Using the nano- and micron-sized silver paste, so called hybrid type, made low temperature firing. So we could minimize the thermal budget in metallization process. Also the adhesion property greatly depended on the composition of paste, especially added resin and inorganic additives. In this paper, we will show that the metallization process of back-contact solar cell was realized as optimized nano-paste characteristics.

  • PDF

조선시대 조적용 석회의 소성 성능과 모르타르의 물성에 대한 실험 연구 (An Experimental Study on the Firing Performance and Property of Lime Mortar for Building in Joseon Dynasty)

  • 이상옥;정광용
    • 건축역사연구
    • /
    • 제25권3호
    • /
    • pp.37-45
    • /
    • 2016
  • This study was to investigate the firing method of limestone in Joseon Dynasty, and analyze the physical chemical properties of lime mortars in Joseon Dynasty. This study was to manufacture and evaluate the firing experiment and mortar of Limestone by each sort in order to reproduce the traditional lime mortars in Joseon Dynasty, and investigate the behavior to improve physical properties according to the firing method of Limestone. This study has found out that there were screening criteria and standard of appropriate firing temperature about the Limestone in Joseon Dynasty. Accordingly, this study was to improve its strength through various additives and mixture. In particular, in case of Limestone, the black and blue Limestone were preferred, and most of domestic Limestones were low grade Limestone including the clay and took ivory white or blue with low whiteness. This study has shown that the low grade Limestone was mined by the surface mining compared with the high grade Limestone as underground mining method, and could be used because it was easy to mine relatively and there was possibility that Natural Hydraulic Lime(NHL) was used with the traditional lime mortars in Joseon Dynasty.

저온소결 세라믹기판용 Cordierite계 결정화유리의 합성 및 특성조사에 관한 연구;(II) $CeO_2$를 첨가한 Cordierite계 결정화유리의 특성 (Synthesis and Characterization of Cordierite Glass-Ceramics for Low Firing Temperature Substrate; (II) Properties of Cordierite Glass-Ceramics Containing CeO2)

  • 이근헌;김병호;임대순;정재현
    • 한국세라믹학회지
    • /
    • 제29권10호
    • /
    • pp.827-835
    • /
    • 1992
  • The effects of CeO2 on the properties of cordierite-based glass-ceramics and its applicability to low firing temperature substrate were examined. Glass-ceramics were prepared by sintering the glass powder compacts at 900~100$0^{\circ}C$ for 3 h. Density, bending strength, dielectric constant and thermal expansion coefficient of the glass-ceramics were measured as functions of CeO2 contents and sintering temperatures. By adding CeO2, dense glass-ceramics were obtained below 100$0^{\circ}C$. dielectric constant and bending strength were more dependent on the porosity of glass-ceramics containing 5 wt% CeO2, sintered at 100$0^{\circ}C$ for 3 h, were as follows; relative density is 95.3%, bending strength is 178$\pm$11 MPa, dielectric constant is 4.98$\pm$0.20 (at 1 MHz) and thermal expansion coefficient is 33.7$\times$10-7/$^{\circ}C$. Therefore, the glass-ceramics containing 5 wt% CeO2 appeared to be suitable for low firing temperature substrate of electronic devices.

  • PDF