• Title/Summary/Keyword: Glass frits

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Effect of Additives on Transmittance of Tick Film Prints in PDP

  • Jun, Jae-Sam;Cha, Myung-Ryoung;Kim, Yu-Jin;Kim, Hyung-Sun
    • 한국정보디스플레이학회:학술대회논문집
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    • 2004.08a
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    • pp.544-547
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    • 2004
  • Glass frits for dielectric layers are mostly used for screen printing process. Several additives have already been known to be well matched with lead-oxide glasses system. The use of lead oxide, however, creates environmental problems, so many recent studies on lead-free glasses compositions have been carried out. A study of the suitability between additives and lead-free glass system is needed. In this study, we have used a screen-printing method to make thick films of lead-oxide glass and lead-free glass using different additives, and analyzed and compared the transmittance of the thick films.

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Simple Fabrication of Green Emission and Water-Resistant CsPbBr3 Encapsulation Using Commercial Glass Frits (상업용 유리프릿의 소결 공정을 이용한 내수성을 갖는 CsPbBr3/Glass 세라믹 복합체의 제작)

  • Mun, Na-eun;Kim, Sunghoon
    • Korean Journal of Materials Research
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    • v.31 no.1
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    • pp.54-59
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    • 2021
  • In this work, narrow-band green-emitting CsPbBr3 particles are embedded in commercialized glass composites by a facile dry process. By optimizing the method through sintering in glass frit (GF) composites including CsBr and PbBr2, used as precursors, the encapsulation of CsPbBr3 particles made them waterproof with green fluorescence. To improve the fluorescent properties by reducing aggregation of CsPbBr3, fumed silica (FS) is additionally used to help particles avoid bulking up in the glass matrix. The CsPbBr3 perovskite/glass composites are characterized using scanning electron microscopy (SEM) images and energy-dispersive X-ray spectroscopy (EDS) maps, which support the existence of CsPbBr3 particles in the glass matrix. The photoluminescence (PL) properties demonstrate that the emission spectrum peak, full width at half maximum (FWHM), and photoluminescence quantum yield (PLQY) values are 519 nm, 17 nm, and 17.7 %. We also confirm the water-resistant properties. To enhance water/moisture stability, the composite sample is put directly into water, with its PLQY monitored periodically under UV light.

Fabrication of Conductive Pastes for Induction Cookware with the Variation of the Contents of Silver Powder and Glass Frit (인덕션 조리용기용 도전성 Paste의 Silver 및 Glass Frit 함량 변화에 따른 미세구조 및 전기적 특성 고찰)

  • Gu, Hyun Ho;Kim, Bong Ho;Yoon, Young Joon
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.11
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    • pp.690-695
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    • 2016
  • Induction cooktop has a great attention due to its safety, quick heating and cleanness compared to gas oven. However, the materials for induction cookware is limited to steel or stainless-steel which has the magnetic property. Recently, it has been tried to apply various porcelain to induction cookware after printing the silver layer on the bottom of cookware plates and co-firing at high temperature. Glass frits are added in the silver paste to improve an adhesion force between porcelain materials containers and transferred silver layer. The hybrid silver pastes for induction cookware requires the proper electrical resistance and the thermal conductivity with base plates. After sintering process at $800^{\circ}C$, a part of melted glass migrated to the porcelain and the rest of the glass frit was exposed to the surface. It was confirmed that most of the glass frit formed an adhesion layer between the porcelain and transferred silver layer that enhances the adhesion force.

Characterization of $BaO-B_2O_3-SiO_2$ glass for the application to PDP;Effect of BaO/$B_2O_3$ ratio

  • Lim, Eun-Sub;Kim, Byung-Sook;Lee, Joon-Hyung;Kim, Jeong-Joo
    • 한국정보디스플레이학회:학술대회논문집
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    • 2004.08a
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    • pp.1099-1102
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    • 2004
  • For the development of Pb-free low temperature sintering glass frits, $BaO-B_2O_3-SiO_2$ system was examined. The content of BaO and $B_2O_3$ was changed when the content of $SiO_2$ was fixed to 10 mol%. When the content of BaO was more than 60 mol% devitrification was observed. In the sintering temperature range between 520${\sim}$620 $^{\circ}C$, the optimum sintering temperature decreased as the content of BaO increased. When BaO ${\geq}$45 mol%, the glasses were crystallized after sintering. Candidate compositions are suggested in $BaO-B_2O_3-SiO_2$ system, which can replace the PbO containing glass system.

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The structure and properties of $50SnO_2-(50-x)P_2O_5-xB_2O_3$ for component materials of PDP

  • An, Yong-Tae;Choi, Byung-Hyun;Ji, Mi-Jung;Ko, Young-Soo;Kim, Hyung-Sun
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.359-361
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    • 2008
  • Glasses in the $SnO_2-(50-x)P_2O_5-xB_2O_3$ system were examined as potential replacement for the PbO glass frits with low firing temperature for component materials of a plasma display panel. The glasses were evaluated for their structural and the thermal expansion coefficient, glass transition and glass softening temperatures and Vickers hardness as a function of the $B_2O_3$ content.

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Crystallization of Passivation Glass for Electronic Devices (전자장치용 Passivation 유리의 결정화에 관한 연구)

  • 손명모;박희찬;이헌수
    • Journal of the Korean Ceramic Society
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    • v.30 no.2
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    • pp.107-114
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    • 1993
  • Zinc-Borosilicate(ZnO 65.0wt%, B2O3 21.5wt%, SiO2 9.0wt%, PbO or tiO2 4wt%) passivation glasses were studied using differential thermal analysis(DTA), scanning electron microscopy(SEM) observations, X-ray diffraction (XRD) patterns and measurement of thermal expansion coefficients. Passivation glasses containing 4wt% TiO2 and 4wt% PbO had crystallization temperature of 680~73$0^{\circ}C$ and major crystalline phases were identified by X-ray diffraction as $\alpha$-ZnO.B2O3 and $\alpha$-5ZnO.2B2O3. As increasing firing temperature, the size of crystalline phases increased by observation of SEM. The thermal expansion coefficient of crystallized glass frits was smaller than that of unfired glass.

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Effect of B2O3 Addition on Thermal, Structure, and Sealing Properties V2O5-P2O5-ZnO Glass (B2O3첨가에 따른 V2O5-P2O5-ZnO계 유리의 물성 및 구조와 봉착특성)

  • Sung, Aram;Kim, Yurian;Kim, Hyungsun
    • Korean Journal of Materials Research
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    • v.26 no.10
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    • pp.549-555
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    • 2016
  • We have investigated a glass-forming region of $V_2O_5-P_2O_5-ZnO$ glass and the effects of the addition of modifier oxides ($B_2O_3$) to the glass systems as a sealing material to improve the adhesion between the glass frits and a soda lime substrate. Thermal properties and coefficient of thermal expansion were measured using a differential scanning calorimetry, a dilatometer and a hot stage microscopy. Structural changes and interfacial reactions between the glass substrate and the glass frit after sintering (at $400^{\circ}C$ for 1 h) were measured by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscope. The results showed that the adhesion strength increases as the content of $B_2O_3$ at 5 mol% increases because of changes in the structural properties. It seems that the glass structures change with $B_2O_3$, and the $Si^{4+}$ ions from the substrate are diffused to the sealing glass. From these results, we could understand the mechanism of strengthening of the adhesion of soda lime silica substrate by ion-diffusion from the substrate to the glass.

Investigation on Lead-Borosilicate Glass Based Dielectrics for LTCC (Lead-Borosilicate Glass계 LTCC용 유전체에 대한 고찰)

  • Yoon, Sang-Ok;Oh, Chang-Yong;Kim, Kwan-Soo;Jo, Tae-Hyun;Shim, Sang-Heung;Park, Jong-Guk
    • Journal of the Korean Ceramic Society
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    • v.43 no.6 s.289
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    • pp.338-343
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    • 2006
  • The effects of lead-borosilicate glass frits on the sintering behavior and microwave dielectric properties of ceramic-glass composites were investigated as functions of glass composition of glass addition ($10{\sim}50vol%$), softening point (Ts) of the glass, and sintering temperature of the composites ($500{\sim}900^{\circ}C$ for 2 h). The addition of 50 vol% glass ensured successful sintering below $900^{\circ}C$. Sintering characteristics of the composites were well described in terms of Ts. PbO addition in to the glass enhanced the reaction with $Al_{2}O_3$ to form liquid phase and $PbAl_{2}Si_{2}O_8$, which was responsible to lower Ts. Dielectric constant(${\epsilon}_r$), $Q{\times}f_0$ and temperature coefficient of resonant frequency (${\tau}_f$) of the composite with 50 vol% glass contents ($B_{2}O_{3}:PbO:SiO_{2}:CaO:Al_{2}O_3$ = 5:40:45:5:5) demonstrated 8.5, 6,000 GHz, $-70\;ppm/^{\circ}C$, respectively, which is applicable to substrate requiring a low dielectric constant. When the same glass composition was applied sinter $MgTiO_3\;and\;TiO_2,\;at\;900^{\circ}C$ (50 vol% glass in total), the properties were 23.8, 4,000 GHz, $-65ppm/^{\circ}C$ and 31.1, 2,500 GHz, $+80ppm/^{\circ}C$ respectively, which is applicable to filter requiring an intermidiate dielectric constant.

Low-temperature Sintering and Dielectric Properties of $CaZrO_3-CaTiO_3$ Ceramics for Middle- Permittivity LTCC Substrate (중유전율 LTCC 기판용 $CaZrO_3-CaTiO_3$계 세라믹스의 저온소결 및 유전특성)

  • Park Jeong-Hyun;Choi Young-Jin;Ko Won-Jun;Park Jae-Hwan;Park Jae-Gwan
    • Journal of the Microelectronics and Packaging Society
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    • v.11 no.3 s.32
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    • pp.17-22
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    • 2004
  • The microwave dielectric properties of $CaZrO_3$ ceramics with addition of $CaTiO_3$ were studied. The effect of glass addition on the low-temperature sintering and microwave dielectric properties of $CaZrO_3-CaTiO_3$ ceramics were also evaluated to develop the materials for functional substrates of low-temperature co-fired ceramics. When $10-20 wt\%$ of lithium borosilicate glass was added, the sintering temperature of the $CaZrO_3-CaTiO_3$ ceramics decreased from $1450^{\circ}C$ to below $900^{\circ}C$. As the $T_f$ of glass frits and $CaZrO_3$ are slightly negative and that of $CaTiO_3$ is significantly positive, zero $T_f$ could be realized by mixing an appropriate amount of $CaTiO_3$ with $CaZrO_3$. The $CaZrO_3-CaTiO_3$ ceramics sintered at $875^{\circ}C$ with $15wt\%$ glass frits showed the relative density of $98\%$, permittivity of 23, quality factor of 2500 GHz, and temperature coefficient of resonant frequency of $ -3 ppm/^{\circ}C$.

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Degradation and Failure Analysis of Lead-free Silver Electrodes with Thermal Cycling (무연계 Ag 외부전극재의 열충격에 따른 열화특성과 고장해석)

  • Kim, Jung-Woo;Yoon, Dong-Chul;Lee, Hee-Soo;Jeon, Min-Seok;Song, Jun-Kwang
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.5
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    • pp.434-439
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    • 2008
  • Silver pastes as the outer electrodes have been prepared using Pb-free glass frits with different content of $Bi_2O_3$ and the effects of glass composition on the degradation behaviors of the Ag electrodes were investigated using the change of adhesion between Ag electrode and alumina substrate with thermal cycle stress. Low adhesion and high surface resistance were observed in Ag electrode using glass frit with a $Bi_2O_3$ content of 60 wt%, owing to the open microstructure formed at the firing temperature of $600^{\circ}C$. When the $Bi_2O_3$ was increased to 80 wt% in the glass frit, the Ag electrodes had a dense microstructure with high adhesion and a low surface resistance. Delamination of the Ag electrodes was a major failure mode under thermal cycle stress and this was attributed to residual stress due to the thermal expansion mismatch between the Ag electrode and the alumina substrate.