• Title/Summary/Keyword: Glass frits

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Low-Temperature Sintering and Dielectric Properties of BaTiO3-Based Ceramics for Embedded Capacitor of LTCC Module (LTCC 내장 캐패시터용 BaTiO3계 세라믹스의 저온소결 및 유전특성)

  • Park, Jeong-Hyun;Choi, Young-Jin;Ko, Won-Jun;Park, Jae-Hwan;Nahm, Sahn;Park, Jae-Gwan
    • Journal of the Korean Ceramic Society
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    • v.42 no.2 s.273
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    • pp.81-87
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    • 2005
  • The compositions for LTCC embedded capacitors based on $BaTiO_3$ ceramics with $5\~15\;wt\%$ of lithium-borosilicate glass frits were studied. After the glass frits, which is chemically stable and has acceptable ability of low-temperature sintering, were added to the host dielectric materials, the sintering behavior and dielectric properties were evaluated. As for $BaTiO_3$, relative density of >$95\%$, permittivity 990, and dielectric loss $3.1\%$ were obtained when sintered at $925^{\circ}C$ with 5 wt$\%$ of glass frits. As for $(Ba,Ca)(Ti,Zr)O_3$ ceramics, relative density of >$95\%$, open porosity <$0.5\%$, permittivity 700, and dielectric loss $2\%$ were obtained when sintered at $875^{\circ}C$ with 10 wt$\%$ of glass frits.

Characteristics of Electroosmotic Pump with Cylindrical Porous Glass Frits (원통형 다공성 유리막을 이용한 전기삼투 펌프의 연구)

  • Kwon, Kil-Sung;Kim, Dae-Joong
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.6
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    • pp.619-624
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    • 2012
  • In this study, we demonstrated the operation of an electroosmotic pump with cylindrical porous glass frits and evaluated its long-term operation. The performance of this electroosmotic pump was characterized in terms of maximum flow rate, current, and pressure using deionized water and 1 mM borate buffer. The maximum flow rate, current, and pressure linearly increase with voltage. The maximum flow rate is normalized by the pumping area and voltage for comparison of the performance between the electroosmotic pumps with cylindrical and planar frits. The normalized maximum flow rate of the cylindrical-type pump is higher than that of the planar-type pump because of their different geometries. The cylindrical-type electroosmotic pump has five times better performance than the planartype electroosmotic pump for a given pump package volume. It can operate stably for over 3 hours.

The Effects of Additives and Fabrication Methods on Durability in Acid of Glass Frit for Thick Film Paste (후막페이스트용 Glass Frit의 내산성에 미치는 제조방법 및 첨가제의 영향)

  • 장규철;노태형;구본급;임대영;김호기
    • Journal of the Microelectronics and Packaging Society
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    • v.7 no.2
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    • pp.29-36
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    • 2000
  • The effects of additives and fabrication methods of glass frits far thick film paste on durability in acid of glass frits fur thick film paste were studied. To investigate the effect of fabrication method, glass brit based on $PbO-SiO_2-B_2O_3$ was prepared by various mixing method and number of melting. The effects of addition of $ZrO_2$, $Al_2O_3$, and $TiO_2$in glass on the durability in acid solution were investigated.

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Effect of Binder Glass Crystallization on Electrical Properties in $RuO_2$-Thick Film Resistor

  • Sungmin Kwon;Kim, Cheol-Young
    • The Korean Journal of Ceramics
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    • v.2 no.1
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    • pp.33-38
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    • 1996
  • In thick film resistors, the characteristics of the frit and the reaction between glass frit and conductor material play an important role for their electrical properties. In this study, various glass frits in the system of $60RO{\cdot}20SiO_2$ $15B_2O_3{\cdot}5Al_2O_3$(RO=PbO, ZnO, CdO; mole%) were mixed with $RuO_2$ and coated on 96% alumina substrate. Only the glass frit containing PbO was reacted with $RuO_2$in$RuO_{2+}$-thick film resistor and produced the new crystalline phase of $Pb_2Ru_2O_{65}$. Their electrical resistivities strongly depend on the amount of $Pb_2Ru_2O_{65}$ crystalline phase obtained, which varied with firing temperature. The sheet resistivities of these resistors were varied from $10^3\; to\; 10^6\;{\Omega}/{\Box}$ depending on heat treatment, and the absolute value of TCR was decreased as the heat treatment temperature increaed. However, $RuO_2$ did not reacted with the glass frits containing ZnO nor CdO, and the resulting showed very high sheet resistivities.

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Dispersion Behavior of Transparent Dielectric Glass Frits in the Multi-Solvent and Ammonium-Type Dispersant System (다성분 용매와 암모늄계 분산제가 적용된 투명 유전체 프릿트 슬립의 분산거동)

  • Kim, Joo-Won;Chun, Young-Hwan;Hwang, Jong-Hee;Lee, Sang-Jin
    • Journal of the Korean Ceramic Society
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    • v.43 no.10 s.293
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    • pp.635-639
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    • 2006
  • Dispersion behavior of the slurries consisted of Pb or Bi-based glass frits, which are used for the fabrication of green sheet as PDP front panel transparent dielectric, was examined in non-aqueous solvent system. Measurements of sedimentation height and viscosity were conducted to determine proper dispersion condition in the various solvent and dispersant system. Azotropic compound and ethyl acetate were used as the solvent and ammonium-type dispersant was applied to the slurries. All slurries were dispersed well in azotropic solvent system involving 20$\sim$50 vol% ethyl acetate at 2$\sim$3 wt% dispersant content. Especially, dispersion behavior was notably improved in the addition of ethyl acetate in the Bi-based frit slurry.

Formation of Pores during Sintering of Lead Borosilicate Glass Frits (Lead Borosilicate Glass Frit의 소결시 기공의 형성 기구)

  • 황건호;김용석
    • Journal of Powder Materials
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    • v.9 no.1
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    • pp.38-42
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    • 2002
  • Effects of chemical compositions on the sintering behavior of the lead borosilicate glass developed for barrier ribs of plasma display panels were investigated in this study. Formation of pores during sintering of the glass was noted and their formation mechanism was investigated using XPS, TG/DTA, and XRD. The results indicated that pores are formed by the oxygen released from Pb-oxides during sintering.

Low-Temperature Sintering and Phase Change of BaTi4O9-Based Ceramics Middle-k LTCC Dielectric Compositions by Glass Addition (Glass 첨가에 의한 BaTi4O9계 중유전율 LTCC 유전체의 저온소결 및 상변화 거동)

  • Choi, Young-Jin;Park, Jae-Hwan;Nahm, Sahn;Park, Jae-Gwan
    • Journal of the Korean Ceramic Society
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    • v.41 no.12 s.271
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    • pp.915-920
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    • 2004
  • The main phase of $BaTi_{4}O_9$-based ceramics was transformed to $BaTi_{5}O_{11}$ caused by the sintering with borosilicate glass, which was analyzed by using XRD and TEM. We considered that the phase change from $BaTi_{4}O_9$-based ceramics to the Ti-rich $BaTi_{5}O_{11}$ phase resulted from borosilicate glass selective absorbing of Ba ions from the $BaTi_{4}O_9$. In these results, we found a dependence on the amounts of the glass frits and the annealing temperature, and the phase change is also dependent of the main phases of $Ba_{4}Ti_{13}O_{30},\;and\;Ba_{2}Ti_{9}O_{20}$, which are involved in the $BaO-TiO_2-based$ Ti-rich region. In the case of sintering of middle- and high- permittivity material with additional glass frits for middle- and high- dielectric coefficients LTCC composition, control of weight fraction of the glass frits accompanying low-temperature sintering property with appropriate phase change is required.

Effect of V2O5 Content and Pre-Sintering Atmosphere on Adhesive Property of Glass Frit for Laser Sealing of OLED (OLED 레이저 실링용 글라스 프릿에서 V2O5 함량 및 가소성 분위기가 접합 특성에 미치는 영향)

  • Jeong, HyeonJin;Lee, Mijai;Lee, Youngjin;Kim, Jin-Ho;Jeon, Dae-Woo;Hwang, Jonghee;Lee, Jungsoo;Yang, Yunsung;Youk, Sookyung;Park, Tae-Ho;Moon, Yun-Gon
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.8
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    • pp.489-493
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    • 2016
  • In this study, the effect of vanadium oxide ($V_2O_5$) content and pre-sintering atmosphere on sealing property of glass frit that consisted of $V_2O_5-BaO-ZnO-P_2O_5-TeO_2-CuO-Fe_2O_3-SeO_2$ was investigated by XPS (X-ray photoelectron spectroscopy). The content of V2O5 was changed to 15, 30, and 45 mol%, and the pre-sintering was carried out in air and $N_2$ condition, respectively. XPS analysis conducted before and after laser irradiation with identical sample. Before laser treatment, glass frits that were pre-sintered at air condition showed both $V^{4+}$ and $V^{5+}$, but the valence state was changed to $V^{5+}$ after laser irradiation when the glass frits contained 30 and 45 mol% $V_2O_5$; this change led to non-adhesive property. On the other hand, glass frits that were pre-sintered at $N_2$ condition exhibited only $V^{4+}$ and it showed fine adhesion irrespective of the $V_2O_5$ content. As a result, the existence of $V^{4+}$ seems to be a major factor for controlling the adhesive property of glass frit for laser sealing.

Effect of Lead Free Glass Frit Compositions on Properties of Ag System Conductor and RuO2 Based Resistor Pastes (Ag계 도체 및 RuO2계 저항체 페이스트의 특성에 미치는 무연계 글라스 프릿트 조성의 영향)

  • Koo, Bon-Keup
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.24 no.3
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    • pp.200-207
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    • 2011
  • Abstract: The effect of lead free glass frit compositions on the properties of thick film conductor and resistor pastes were investigated. Two types lead free frits, HBF-A(without $Bi_2O_3$) and HBF-B(with $Bi_2O_3$) were made from $SiO_2$, $B_2O_3$, $Al_2O_3$, CaO, MgO, $Na_2O$, $K_2O$, ZnO, MnO, $ZrO_2$, $Bi_2O_3$. And Ag based conductor pastes and $RuO_2$ based resistor paste were prepared by mixed with these frits and functional phase(Ag and $RuO_2$), and organic vehicle. The properties of thick film conductor and resistor sintered at $850^{\circ}C$ were studied after printing on $Al_2O_3$ substrate. The morphology of the sintered films surface were SEM and EDS were carried out to analysis the chemical composition on resistor surface and state of Ru atom in frit matrix.

High Efficient and Stable Dye-sensitized Solar Cells (DSSCs) with Low Melting Point Glass Frits

  • Kim, Jong-U;Kim, Dong-Seon;Kim, Hyeong-Sun
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2011.05a
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    • pp.42.2-42.2
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    • 2011
  • $TiO_2$ films were modified by adding a glass frit as a light scattering particle and applied to an anode electrode in dye-sensitized solar cells (DSSCs) to enhance the adhesion between $TiO_2$ and fluorine doped transparent oxide (FTO). Low melting point glass frits at contents of (3 to 7wt%) were added to the nano crystalline $TiO_2$ films. The light scattering properties, photovoltaic properties and microstructures of the photo electrodes were examined to determine the role of the low glass transition temperature ($T_g$) glass frit. Electrochemical impedance spectroscopy, Brunauer-Emmett-Teller method and scratch test were conducted to support the results. The DSSC with the $TiO_2$ film containing 3wt% low Tg glass frit showed optimal performance (5.1%, energy conversion efficiency) compared to the $TiO_2$-based one. The photocurrent density slightly decreased by adding 3wt% of the frit due to its large size and non conductivity. However, the decrease of current density followed by the decrease of electron transfer due to the large frit in $TiO_2$ electrode was compensated by the scattering effect, high surface area and reduced the electron transfer impedance at the electrolyte-dye-$TiO_2$ interface. The stability of the photo electrodes was improved by the frit, which chemically promoted the sintering of $TiO_2$ at relatively low temperature ($450^{\circ}C$).

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