共查询到20条相似文献,搜索用时 15 毫秒
1.
Zhuo Wang Hai Juan Li Liang Liang Zhang Yong Ping Pu 《Journal of Materials Science: Materials in Electronics》2013,24(9):3418-3422
SrO–B2O3–SiO2 (SBS) glass powders were prepared and employed as sintering aids to reduce the sintering temperature of Ba(Fe0.5Nb0.5)O3 (BFN) ceramics. The effects of glass content on the dielectric properties and breakdown strength of BFN ceramics have been investigated. The volume density characterization results of (1 ? x) BFN ? x SBS ceramics indicate that the sintering temperature of BFN ceramics decreased by 200–350 °C with SBS glass addition (when x = 0, 0.01, 0.03 and 0.05). The XRD patterns show BFN ceramics indicate cubic crystal structure and without the formation of a secondary phase. The dielectric constant and dielectric loss decreased gradually with increasing glass content, and the dielectric loss decreased by one order of magnitude with SBS glass addition (when x = 0.05). The breakdown strength of (1 ? x) BFN ? x SBS ceramics increase with increasing glass content, in which is about 33.90 kV/cm with SBS glass addition (when x = 0.05). These improvements in the dielectric characteristics of BFN ceramics have great scientific significance for their applications. 相似文献
2.
Kai Chen Yongping Pu Ning Xu Xu Luo 《Journal of Materials Science: Materials in Electronics》2012,23(8):1599-1603
SrO–B2O3–SiO2 glass powders were prepared and employed as sintering aids to reduce the sintering temperature of Ba0.4Sr0.6TiO3 ceramics. The effects of glass content and sintering temperature on the densification, dielectric properties and energy storage properties of Ba0.4Sr0.6TiO3 ceramics have been investigated. The relative density characterization results indicate that densification of Ba0.4Sr0.6TiO3 ceramics with glass content becomes apparently from sintering temperature of 1,060 °C. XRD results show all Ba0.4Sr0.6TiO3 ceramics exhibit a perovskite structure without the formation of a secondary phase. The dielectric constant and dielectric loss decreased gradually with increasing glass content. The relationship between dielectric constant and breakdown strength was discussed using the thermochemical model. A discharged energy density of 0.44 J/cm3 with an energy efficiency of 67.4% was achieved for Ba0.4Sr0.6TiO3 ceramic with 2.0 wt% glass addition sintered at 1,180 °C. 相似文献
3.
Yonggang Zhang Shunhua Wu Baolin Zhang Xiaogang Wu 《Journal of Materials Science: Materials in Electronics》2014,25(7):3085-3089
The effect of Li2O3–B2O3–SiO2 (LBS) liquid-phase additives on the sintering, microstructures, and dielectric properties of MgO–TiO2–ZnO–CaO (MTZC) ceramics was investigated. It was found that the sintering temperature could be lowered easily, and the dielectric properties of MTZC ceramics could be greatly improved by adding a small amount of LBS solution additives. With the addition of 10 wt% LBS, the ceramics sintered at 900 °C showed favorable dielectric properties with εr = 21.7, Qf = 5.0 × 104 GHz, and TCF = ?21.6 ppm/ °C. The distructive physical analysis showed an excellent co-firing interfacial behavior between the MTZC ceramic and the Ag electrode. It indicated that MTZC ceramics with LBS solution additives have a number of potential applications on passive integrated devices based on the low-temperature co-fired ceramics technology. 相似文献
4.
Wenqin Zhang Jinwen Wang Shuangxi Xue Shaohui Liu Bo Shen Jiwei Zhai 《Journal of Materials Science: Materials in Electronics》2014,25(9):4145-4149
The barium strontium titanate (BaxSr1–xTiO3) glass–ceramics doped with different content of La were prepared via controlled crystallization. Phase compositions, microstructure and dielectric behaviors were investigated systematically. The results revealed that La2O3 additives had little influence on the dielectric constant but significantly changed the microstructure of the glass–ceramics, which led to improved breakdown strength (BDS). The optimized energy-storage density of 3.18 J/cm3 was achieved in the glass–ceramics with 1.0 wt% La2O3 content which is 2.56 times higher than pure BST glass–ceramics, suggesting glass–ceramics of this composition could be an attractive candidate for energy-storage applications. 相似文献
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Nobuyuki Isaka Kensuke Ohkawa Hajime Kiyono Hidenobu Itoh Junichi Takahashi 《Journal of Materials Science: Materials in Electronics》2008,19(12):1233-1239
Crystallization behavior was studied for glass powders in which some portions of AlF3 in the net composition of 60(Ba0.7Sr0.3)TiO3–25SiO2–15AlF3 were replaced with Ga2O3 or Bi2O3. The replacement with Ga2O3 resulted in a progressive increase in crystallization temperature, which effectively assisted the viscous sintering of glass
powders to produce densified BST glass–ceramics at relatively lower temperatures. For the Bi2O3-replaced glass powders, an increasing amount of Bi2O3 replacement lowered the crystallization temperature and yielded less densified glass–ceramics containing a considerable amount
of glassy phase. The temperature dependence of permittivity was estimated for the Ga2O3- and Bi2O3-replaced glass–ceramics as a function of sintering conditions and the amount of replacement, respectively. 相似文献
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A. Sayyadi-Shahraki E. Taheri-Nassaj S. A. Hassanzadeh-Tabrizi H. Barzegar-Bafrooei 《Journal of Materials Science: Materials in Electronics》2014,25(1):355-360
The effects of Li2O–ZnO–B2O3 (LZB) glass additive on the sintering behavior, phase composition, microstructure and microwave dielectric properties of Li2Zn3Ti4O12 ceramics were investigated. The addition of a small amount of LZB glass can reduce the sintering temperature of Li2Zn3Ti4O12 ceramics from 1,075 to 900 °C without much degradation of the microwave dielectric properties. Only a single-phase Li2Zn3Ti4O12 is formed in Li2Zn3Ti4O12 ceramic with LZB addition. Typically, the 1.5 wt% LZB glass-added Li2Zn3Ti4O12 ceramic sintered at 900 °C for 2 h can reach a high relative density of 97.5 % and exhibits good microwave dielectric properties, i.e., relative dielectric constant (ε r ) = 19.1, quality factor (Q) = 7083.5 at 9 GHz, and temperature coefficient of resonant frequency (τ f ) = ? 48.9 ppm/°C. In addition, the ceramic could be co-fired well with an Ag electrode, which is made it as a promising dielectric ceramic for low temperature co-fired ceramics technology application. 相似文献
9.
Haikui Zhu Hongqing Zhou Min Liu Pengfei Wei Guijun Xu Ge Ning 《Journal of Materials Science: Materials in Electronics》2009,20(11):1135-1139
CaO–B2O3–SiO2 (CBS) glass powders are prepared by traditional glass melting method, whose properties and microstructures are characterized
by Differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). It is found that the
pure CBS glass ceramics possess excellent dielectric properties (ε
r = 6.5, tan δ = 5 × 10−3 at 10 GHz), but a higher sintering temperature (>900 °C) and a narrow sintering temperature range (about 10 °C). The addition
of a low-melting-point CaO–B2O3–SiO2 glass (LG) could greatly decrease the sintering temperature of CBS glass to 820 °C and significantly enlarge the sintering
temperature range to 40 °C. The CBS glass ceramic with 30 wt% LG glass addition sintered at 840 °C exhibits better dielectric
properties: ε
r ≈ 6, tan δ < 2 × 10−3 at 10 GHz, and the major phases of the sample are CaSiO3, CaB2O4 and SiO2. 相似文献
10.
Xiaobin Liu Huanfu Zhou Xiuli Chen Liang Fang 《Journal of Materials Science: Materials in Electronics》2012,23(2):640-644
The effects of ZnO–B2O3–SiO2 glass (ZBS) additions on the sintering behavior and microwave dielectric properties of Ba2Ti3Nb4O18 ceramic have been investigated. Due to the liquid phase effects resulting from the additives, the addition of ZBS glass can
reduce the sintering temperature of Ba2Ti3Nb4O18 ceramic from 1,250 to 925 °C and induce no obvious degradation of the microwave dielectric properties. Typically, when 3wt%
ZBS is added, a dense ceramic can be sintered at 925 °C with a εr of 33.2, a high of Q × f of 13,600 GHz and a low τ
f
of −5.9 ppm/°C. Moreover, ZBS glass-added Ba2Ti3Nb4O18 ceramic has a chemical compatibility with silver electrode, which suggests that the ceramic could be applied to LTCC devices
application. 相似文献
11.
Haikui Zhu Wei Shen Yu Jin Hongqing Zhou Xiaodong Shen Weijuan quan 《Journal of Materials Science: Materials in Electronics》2013,24(9):3546-3550
The effects of CaO–B2O3–SiO2 (CBS) glass addition on the sintering temperature and dielectric properties of Mg4Nb2O9 ceramics have been investigated using X-ray diffraction, Scanning electron microscopy and Differential thermal analysis. The CBS glass can change to liquid phase at about 750 °C and a small amount of CBS glass addition to Mg4Nb2O9 ceramics can greatly decrease the sintering temperature to about 1,125 °C. It is revealed that the reduced sintering temperature is attributed to the formation of liquid phase. The major phases of the sample are Mg4Nb2O9 and MgNb2O6. The relationship between τ f values and the content of glass additions have the reverse change trends. The Mg4Nb2O9 ceramics with 2wt% glass addition sintered 1,125 °C exhibit good microwave dielectric properties: dielectric constant (ε r ) of 13 and Q·f value of 69,000 GHz. 相似文献
12.
Baoyu Huang Zhefei Wang Tao Chen Lixi Wang Zhenxiao Fu Qitu Zhang 《Journal of Materials Science: Materials in Electronics》2014,25(12):5264-5268
MnO2 doped Ba4.2Nd9.2Ti18O54–NdAlO3(13 wt%) (BNT–NA) microwave dielectric ceramics with the near zero τ f and the wide range of sintering temperature were prepared by conventional solid state method. The effects of Mn4+ doping on the microstructures and microwave dielectric properties of BNT–NA ceramics were investigated. XRD patterns showed only a single BaNd2Ti5O14 phase was identified in all samples and there was no second phase. The sintering temperature decreased from 1,380 to 1,320 °C as MnO2 content increased from 0.1 to 0.9 wt%. The MnO2 doped BNT–NA ceramics could be densified at a lower sintering temperature. The MnO2 additive had a positive effect on lowing sintering temperature of BNT–NA ceramics. The τ f varied from negative to positive with the increase of MnO2. Excellent microwave dielectric properties were achieved in Ba4.2Nd9.2Ti18O54–NdAlO3 ceramics doped with 0.3 wt% MnO2 and sintered at 1,380 °C for 2 h: ε r = 66.5, Q × f = 13,948 GHz, τ f = 0.4 ppm/°C. 相似文献
13.
Zhenjun Qing Bo Li Hao Li Yingxiang Li Shuren Zhang 《Journal of Materials Science: Materials in Electronics》2014,25(5):2149-2154
Li2O–Al2O3–SiO2 (LAS) glass–ceramics for low temperature co-fired ceramics (LTCC) application were prepared by melting method, and the effects of MgO on the sinterability, microstructure, dielectric property, thermal expansion coefficient (CTE) and mechanical character of this glass–ceramics have been studied. The X-ray diffraction images represent that the main phase is β-spodumene solid solutions. And some ZrO2 and CaMgSi2O6 phases in LAS glass–ceramics are detected. The LAS glass–ceramics without additive (MgO) sintered at 800° had the dielectric properties: dielectric constant (εr) of 5.3, dielectric loss (tanδ) of 2.97 × 10?3 at 1 MHz, CTE value of 1.06 × 10?6 K?1, bulk density of 2.17 g/cm3, and flexural strength of 73 MPa. 5.5 wt% MgO-added LAS glass–ceramic achieves densification at 800° exhibited excellent properties: low dielectric constant and loss (εr = 7.1, tanδ = 2.02 × 10?3 at 1 MHz), low CTE (2.89 × 10?6 K?1), bulk density = 2.65 g/cm3 as well as high flexural strength (145 MPa). The results indicate that the addition of MgO is helpful to improve the dielectric and mechanical properties. The formation of CaMgSi2O6 crystal phase with higher CTE leads to the increase of CTE value of LAS glass–ceramics due to the increasing MgO content, and the increase of CTE is favourable for matching with silicon (3.1 × 10?6 K?1). The prepared LAS glass–ceramics have the potential for LTCC application. 相似文献
14.
Influence of La–B–Zn glass on the sintering and microwave dielectric properties of Ca–Nd–Ti ceramics
Enzhu Li Na Niu Shuxin Duan Ying Yuan Bin Tang 《Journal of Materials Science: Materials in Electronics》2016,27(4):3164-3169
The effects of La2O3–B2O3–ZnO (LBZ) glass on the sintering behaviors, phase structures, microstructures and the microwave dielectric properties of perovskite type Ca0.6Nd0.26TiO3 (CNT) ceramics were studied. It indicates that the LBZ glass has an obvious effect on lowering the sintering temperature without damaging the microwave dielectric properties of the CNT ceramics. Small amounts of LBZ glass significantly lowered the sintering temperatures of CNT ceramics and obtained excellent microwave dielectric properties. However, too much LBZ glass is leading to inferior dielectric properties. The CNT ceramics doped with 3 wt% LBZ can be well sintered at 975 °C for 4 h and shows good properties: εr = 87.87, Q × f = 8132 GHz (f = 3.3 GHz), τf = +244.63 ppm/°C. 相似文献
15.
Zhenjun Qing Bo Li Hao Li Yingxiang Li Shuren Zhang 《Journal of Materials Science: Materials in Electronics》2014,25(10):4206-4211
In this work, in order to obtain the materials for low temperature co-fired ceramics applications, CaO–Al2O3–SiO2 (CAS) based ceramics were synthesized at a low sintering temperature of 900 °C. The influences of Al2O3/SiO2 ratio on the microstructure, mechanical, electrical and thermal properties were studied. According to the X-ray diffractomer and scanning electron microscopy results, the addition of the Al2O3 is advantageous for the formation of the desired materials. Anorthite(CaAl2Si2O8) is the major crystal phase of the ceramics, and the SiO2 phase is identified as the secondary crystal phase. No new crystal phase appears in the ceramics with the increasing Al2O3 content. More or less Al2O3 addition would all worsen the sintering, mechanical and dielectric properties of CAS based ceramics. The ceramic specimen (Al2O3/SiO2 = 20/18.5) sintered at 900 °C shows good properties: high bending strength = 145 MPa, low dielectric constant = 5.8, low dielectric loss = 1.3 × 10?3 and low coefficient of thermal expansion value = 5.3 × 10?6 K?1. The results indicate that the prepared CAS based ceramic is one of the candidates for low temperature co-fired ceramic applications. 相似文献
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Yingxiang Li Junshan Li Bin Tang Shuren Zhang Hao Li Zhenjun Qin Hetuo Chen Han Yang Hong Tu 《Journal of Materials Science: Materials in Electronics》2014,25(6):2780-2785
The effects of CaO–B2O3–SiO2 (CBS) glass addition on the sintering temperature and dielectric properties of Li2ZnTi3O8–TiO2 (LZT) composite ceramics have been investigated. Due to the compensating effect of rutile TiO2 (τf ≈ +450 ppm/ °C), the temperature coefficient of resonant frequency (τf) for Li2ZnTi3O8 + 4 wt% TiO2 with biphasic structure was adjusted to a value near zero. The pure LZT ceramics were usually sintered at high temperature of about 1,160 °C. It was found in our experiment that a small amount of CBS glass additives could effectively lower the sintering temperature of LZT ceramics to 900 °C. With increasing the content of CBS glass, both of dielectric constant (εr) and quality factor (Q × f) value decreased. Typically, the 1 wt% CBS glass added Li2ZnTi3O8 + 4 wt% TiO2 ceramic sintered at 900 °C for 4 h exhibited good microwave dielectric properties of εr = 26.9, Q × f = 23,563 GHz and τf = ?1.5 ppm/ °C, which made it promising for low temperature co-fired ceramics technology application. 相似文献
18.
Aluminum nitride (AIN) ceramics, with binary additives B2O3-Y2O3, were sintered at temperatures from 1700 to 1850 °C. The microstructure and sintering characteristics were studied by XRD, HREM, SEM and TEM/EDS, which showed that Y2O3 gave different yttrium aluminates through the reaction with Al2O3 under different conditions. With the increase of sintering temperature, the yttrium-to-aluminum atomic ratio Y/Al decreased in the secondary phases of the sintered bodies. It was discovered that B2O3 could dissolve in the yttrium aluminates, forming some ordered structure with a superlattice. After sintering at 1850 °C for 4 h, a specimen with a fine microstructure and a thermal conductivity of 190 Wm–1K–1 was obtained. 相似文献
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Wang Huaizhi Liu Yangfu Luo Shaojin Lu Guanyu Xie Kainan Yang Fan Tong Jianxi Meng Fancheng 《Journal of Materials Science: Materials in Electronics》2022,33(2):1000-1007
Journal of Materials Science: Materials in Electronics - The effects of injecting TiO2 to a Li2O–MgO–ZnO–B2O3–SiO2 (LMZBS) microwave dielectric composite on sinterability,... 相似文献