以Bi_2O_3-B_2O_3-ZnO为基质玻璃的原料组分,制备工艺采用传统的熔融冷却法,溶制温度950℃制备出基质玻璃。再通过低温共烧结法在基质玻璃中成功掺入Lu_(2.94-x)Y_XAl_5O_(12):0.06Ce(X=0~0.8)绿色荧光粉制备出绿色荧光玻璃。利用stc-4...以Bi_2O_3-B_2O_3-ZnO为基质玻璃的原料组分,制备工艺采用传统的熔融冷却法,溶制温度950℃制备出基质玻璃。再通过低温共烧结法在基质玻璃中成功掺入Lu_(2.94-x)Y_XAl_5O_(12):0.06Ce(X=0~0.8)绿色荧光粉制备出绿色荧光玻璃。利用stc-4000快速光谱仪和PMS-80可见光谱分析系统研究了不同电流下的LED器件光效、色温、色坐标的变化情况。结果表明,随着驱动电流从10 m A逐渐升高到30 m A,LED器件的测试光效大约下降16%,相关色温变化较小,色坐标未发生漂移。由于缺少红光成分,实验在绿色荧光玻璃上通过旋转涂覆一层红色荧光薄膜制备出高显色指数的暖白光LED,进一步推动绿色荧光玻璃在白光LED中的应用。展开更多
The influences of BaCu（B2O5） （BCB） addition on sintering, microstructure and microwave dielectric properties of Li2MgTi308 ceramics were investigated using X-ray diffractometry, scanning electron microscopy and mi...The influences of BaCu（B2O5） （BCB） addition on sintering, microstructure and microwave dielectric properties of Li2MgTi308 ceramics were investigated using X-ray diffractometry, scanning electron microscopy and microwave dielectric measurements. The experimental results show that a small amount of BaCu（B2O5） addition can effectively reduce the sintering temperature to 900℃, and induce only a limited degradation of the microwave dielectric properties. Typically, the best microwave dielectric properties of er24.5, Q×f =24 622 GHz, rf=4.2×10-6℃ -1 are obtained for 1.0% BCB-doped Li2MgTi3O8 ceramics sintered at 900℃ for 3 h. The BCB-doped Li2MgTi3O8 ceramics can be compatible with Ag electrode, which may be a strong candidate for low temperature co-fired ceramics applications.展开更多
The dispersion, stabilization and rheological properties of the slurry with various relative molecular masses of PVB were studied. The sintering properties, microstructure and dielectric properties of borosilicate gla...The dispersion, stabilization and rheological properties of the slurry with various relative molecular masses of PVB were studied. The sintering properties, microstructure and dielectric properties of borosilicate glass/Al203 composites were also investigated. The intensities of the typical vibrating bands decrease with the decrease of the relative molecular mass of PVB, which demonstrates that the content of butyral groups in PVB binders decreases correspondingly, leading to a rapid decrease in the viscosity of the mixed slurry. The solid content of samples increases with the decrease of the relative molecular mass of PVB, and this further leads to the increase of tape thickness, bulk density and dried-shrinkage coefficient of tapes. The bulk density, relative density, three-point strength and dielectric constant of sintered samples increase with the increase of the solid content, and the shrinkage and dielectric loss decrease. By contrast, samples for PVB-5s exhibit better properties of a bulk density of 3.10 g/cm3, a relative density of 98.1%, a three-point strength of 208 MPa, aεt value of 8.01, a tanδ value of 7.6× 10^-4 at 10 MHz and a well matching with Ag electrodes.展开更多
Low-temperature sintering and properties of LTCC （low temperature co-fired ceramics） materials based on CaO-BaO-Al2O3-B2O3-SiO2 glass and various fillers such as Al2O3, silica glass, christobalite, AlN, ZrO2, MgO-Si...Low-temperature sintering and properties of LTCC （low temperature co-fired ceramics） materials based on CaO-BaO-Al2O3-B2O3-SiO2 glass and various fillers such as Al2O3, silica glass, christobalite, AlN, ZrO2, MgO-SiO2, TiO2 were investigated. The results show that densification, crystallization, microstructures and dielectric properties of the composites are found to strongly depend on the type of filler. The densification process of glass/ceramic composites with various fillers is mainly from 600 ℃ to 925 ℃, and the initial compacting temperature of samples is 600 ℃. The initial rapid densification of samples starts at its glass softening temperature. LTCC compositions containing Al2O3, silica glass, AlN and MgO-SiO2 fillers start to have the crystallization peaks at 890, 903, 869 and 844 ℃, respectively. The crystallization peaks are believed as correlated to the crystallization of CaAl2SiO8, β-SiO2, Ca2Al2SiO7 and β-SiO2. The composite ceramic with Al2O3, silica glass and TiO2 ceramic have a better dense structure and better smooth fracture surface. Sample for Al2O3 has the lowest dielectric loss tanδ value of 0.00091, whereas the sample for MgO.SiO, has the highest dielectric loss tanδ value of 0.02576. The sample for TiO2 has the highest dielectric constant value of 14.46, whereas the sample for AIN has the lowest dielectric constant value of 4.61.展开更多
文摘以Bi_2O_3-B_2O_3-ZnO为基质玻璃的原料组分,制备工艺采用传统的熔融冷却法,溶制温度950℃制备出基质玻璃。再通过低温共烧结法在基质玻璃中成功掺入Lu_(2.94-x)Y_XAl_5O_(12):0.06Ce(X=0~0.8)绿色荧光粉制备出绿色荧光玻璃。利用stc-4000快速光谱仪和PMS-80可见光谱分析系统研究了不同电流下的LED器件光效、色温、色坐标的变化情况。结果表明,随着驱动电流从10 m A逐渐升高到30 m A,LED器件的测试光效大约下降16%,相关色温变化较小,色坐标未发生漂移。由于缺少红光成分,实验在绿色荧光玻璃上通过旋转涂覆一层红色荧光薄膜制备出高显色指数的暖白光LED,进一步推动绿色荧光玻璃在白光LED中的应用。
基金Project(2010GXNSFA013029) supported by the Natural Science Foundation of Guangxi Province,ChinaProject(101059529) supported by National Undergraduate Innovation Program of the Ministry of Education of China
文摘The influences of BaCu（B2O5） （BCB） addition on sintering, microstructure and microwave dielectric properties of Li2MgTi308 ceramics were investigated using X-ray diffractometry, scanning electron microscopy and microwave dielectric measurements. The experimental results show that a small amount of BaCu（B2O5） addition can effectively reduce the sintering temperature to 900℃, and induce only a limited degradation of the microwave dielectric properties. Typically, the best microwave dielectric properties of er24.5, Q×f =24 622 GHz, rf=4.2×10-6℃ -1 are obtained for 1.0% BCB-doped Li2MgTi3O8 ceramics sintered at 900℃ for 3 h. The BCB-doped Li2MgTi3O8 ceramics can be compatible with Ag electrode, which may be a strong candidate for low temperature co-fired ceramics applications.
基金Project(2007AA03Z455) supported by the National High Technology Research and Development Program of ChinaProjects(BE2009168)supported by Science&Technology Pillar Program of Jiangsu Province, China+2 种基金Project supported by the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions, ChinaProject(CXZZ12_0415) supported by the Innovation Foundation for Graduate Students of Jiangsu Province, ChinaProject(IRT1146) supported for Changjiang Scholars and Innovative Research Teamin University (PCSIRT) of China
文摘The dispersion, stabilization and rheological properties of the slurry with various relative molecular masses of PVB were studied. The sintering properties, microstructure and dielectric properties of borosilicate glass/Al203 composites were also investigated. The intensities of the typical vibrating bands decrease with the decrease of the relative molecular mass of PVB, which demonstrates that the content of butyral groups in PVB binders decreases correspondingly, leading to a rapid decrease in the viscosity of the mixed slurry. The solid content of samples increases with the decrease of the relative molecular mass of PVB, and this further leads to the increase of tape thickness, bulk density and dried-shrinkage coefficient of tapes. The bulk density, relative density, three-point strength and dielectric constant of sintered samples increase with the increase of the solid content, and the shrinkage and dielectric loss decrease. By contrast, samples for PVB-5s exhibit better properties of a bulk density of 3.10 g/cm3, a relative density of 98.1%, a three-point strength of 208 MPa, aεt value of 8.01, a tanδ value of 7.6× 10^-4 at 10 MHz and a well matching with Ag electrodes.
基金Project supported by the Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions ChinaProject(CXZZ12_0415) supported by Innovation Foundation for Graduate Students of Jiangsu Province ChinaProject(IRT1146) supported by Changjiang Scholars and Innovative Research Team in University(PCSIRT),China
文摘Low-temperature sintering and properties of LTCC （low temperature co-fired ceramics） materials based on CaO-BaO-Al2O3-B2O3-SiO2 glass and various fillers such as Al2O3, silica glass, christobalite, AlN, ZrO2, MgO-SiO2, TiO2 were investigated. The results show that densification, crystallization, microstructures and dielectric properties of the composites are found to strongly depend on the type of filler. The densification process of glass/ceramic composites with various fillers is mainly from 600 ℃ to 925 ℃, and the initial compacting temperature of samples is 600 ℃. The initial rapid densification of samples starts at its glass softening temperature. LTCC compositions containing Al2O3, silica glass, AlN and MgO-SiO2 fillers start to have the crystallization peaks at 890, 903, 869 and 844 ℃, respectively. The crystallization peaks are believed as correlated to the crystallization of CaAl2SiO8, β-SiO2, Ca2Al2SiO7 and β-SiO2. The composite ceramic with Al2O3, silica glass and TiO2 ceramic have a better dense structure and better smooth fracture surface. Sample for Al2O3 has the lowest dielectric loss tanδ value of 0.00091, whereas the sample for MgO.SiO, has the highest dielectric loss tanδ value of 0.02576. The sample for TiO2 has the highest dielectric constant value of 14.46, whereas the sample for AIN has the lowest dielectric constant value of 4.61.
