Jiangxi Key Laboratory of Advanced Ceramic Materials

Jingdezhen, China

Jiangxi Key Laboratory of Advanced Ceramic Materials

Jingdezhen, China
SEARCH FILTERS
Time filter
Source Type

Xiao Z.,Jingdezhen Ceramic Institute | Wang Y.,Jingdezhen Ceramic Institute | Han R.,Jingdezhen Ceramic Institute | Luo M.,Jingdezhen Ceramic Institute | Luo M.,Jiangxi Key Laboratory of Advanced Ceramic Materials
Glass Technology: European Journal of Glass Science and Technology Part A | Year: 2016

ZnO-BaO-Bi2O3-B2O3 glasses for low temperature sealing applications have been prepared using the conventional melt quenching technique. The effects of Bi2O3/B2O3 ratio on the glass structure and properties have been systematically investigated using Fourier transform infrared (FT-IR) spectroscopy, x-ray photoelectron spectroscopy (XPS) and physical measurements. The FT-IR and XPS spectra show that the glass network is mainly constituted by [BO3], [BiO3] and [BiO6]. With increasing Bi2O3/B2O3 ratio, the relative fraction of bridging oxygen (BO) decreases gradually, whereas the concentration of Bi3+ increases compared to Bi5+ in the glasses. Accordingly, the bulk density, glass transition temperature (Tg) and softening temperature (Ts) increase, coefficient of thermal expansion (CTE), bend strength and Vickers hardness decrease. The sealing experiment suggests that ZnO-BaO-Bi2O3-B2O3 glasses area potential matched sealing material for Kovar 4J50 alloy.


Fu K.L.,Jingdezhen Ceramic Institute | Fu K.L.,Wuhan University of Technology | Jiang W.H.,Jingdezhen Ceramic Institute | Jiang W.H.,Jiangxi Key Laboratory of Advanced Ceramic Materials | And 3 more authors.
Materials Science Forum | Year: 2016

Mullite whiskers were prepared via non-hydrolytic sol-gel process combined with molybdate molten salt using tetraethoxysilane and anhydrous aluminum chloride as precussor, anhydrous ether as oxygen donor, molybdate as molten salt. The effects of heat treatment temperature, molten salt amount, holding time on synthesis and morphology of mullite whiskers were investigated by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The results show that the mullite whiskers appeared at the lowest temperature of 800℃, and optimized mullite whiskers could be prepared at 900℃ for 8 h with the mass ratio of xerogel and molybdate as 1:2, the diameter of the whiskers was in the range of 0.15-0.22 μm with the aspect ratio of more than 40. © 2016 Trans Tech Publications, Switzerland.


Xiao Z.,Jingdezhen Ceramic Institute | Xiao Z.,Jiangxi Key Laboratory of Advanced Ceramic Materials | Zhu L.,Yulin Normal University | Wang S.,Southwest forestry University
Advanced Materials Research | Year: 2012

Lithium carbonate, zinc oxide and silica as the main raw materials, potassium oxide and sodium as flux, phosphorus pentoxide as nucleating agent, the glass in Li 2O-ZnO-SiO 2 was synthesized by conventional melt cooling method and then converted to glass-ceramics. The crystallization behavior, microstructure and thermal expansion coefficient of the resulting glass-ceramics were investigated by XRD, SEM and thermal performance test. The results show that the Tg of the matrix glass is about 508°C, initial crystallization temperature is about 620°C. When the crystallization temperature ranges from 650°C to 750°C, the main crystal phase is Li 2ZnSiO 4. Increasing crystallization temperature to 850°C, much cristobalite crystals is formed. Owing to the high TEC of the cristobalite, the glass-ceramics with TEC of 12.27×10 -6°C -1 were obtained, which is matched with the TEC of stainless steel SAE 1010.


Jiang W.,Jingdezhen Ceramic Institute | Jiang W.,Jiangxi Key Laboratory of Advanced Ceramic Materials | Xu Z.,Jingdezhen Ceramic Institute | Liu J.,Jingdezhen Ceramic Institute | And 2 more authors.
Materials Science Forum | Year: 2013

Aluminum titanate (Al2TiO5) powder has been synthesized at low temperature via nonhydrolytic sol-gel method by using aluminum powder as aluminum source, titanium tetrachloride as titanium source, anhydrous ethanol as oxygen donor with different catalysts. The phase transformation of aluminum titanate xerogel powder during heat treatment and the influence of the mixing orders of raw materials, catalyst kinds on the synthesis of aluminum titanate were investigated by means of differential-thermal analysis (DTA-TG), X-ray diffraction (XRD), transmission electron microscope (TEM). The results indicated that aluminum titanate powder was easily synthesized at 750 °C by using AlCl3 as catalyst with a mixing order of adding TiCl4 before AlCl3 into aluminum alcohol mixture. The catalytic order of the different catalysts in the preparation process of aluminum titanate is: FeCl3> AlCl3> MgCl2. The catalyst promoted the activation of metal aluminum powder and played a major role in the synthesis of aluminum titanate powder at low temperature via nonhydrolytic sol-gel method. © (2013) Trans Tech Publications, Switzerland.


Jiang W.,Jingdezhen Ceramic Institute | Jiang W.,Jiangxi Key Laboratory of Advanced Ceramic Materials | Feng Y.,Jingdezhen Ceramic Institute | Liu J.,Jingdezhen Ceramic Institute | And 2 more authors.
Materials Science Forum | Year: 2013

Inclusion pigments of ZrSiO4/C were prepared by nonhydrolytic sol-gel (NHSG) method combined with the process of carbon black modification. The crystalline phases, microstructure, functional groups on the surface of carbon black and chromatic value of the pigments were characterized by XRD, TEM, FTIR and Colorimeter, respectively. The surface structural changes of the carbon black modified by nitric acid and the influences of process parameters on the chromatic value of the pigments were also investigated. The results show that the process of carbon black modification enhances the affinity and binding force between carbon black and ZrCl4 sol, which contributes to improve the effect of carbon black wrapped by ZrSiO4. The ZrSiO4/C inclusion pigment were obtained after calcining at 1000 oC for 8 h, and the L*, a* and b* value is 53.88, 0.74, and 1.88, respectively. © (2013) Trans Tech Publications, Switzerland.


Zhong X.,Jingdezhen Ceramic Institute | Lu X.,Jingdezhen Ceramic Institute | Cao C.,Jingdezhen Ceramic Institute | Chen Y.,Jingdezhen Ceramic Institute | And 2 more authors.
Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | Year: 2015

Submicron spherical CoAl2O4 pigments were hydrothermal synthesized using CoCl2· 6H·O and AlCl3 as raw materials, NaOH as the precipitant and diethanolamine (DEA) as capping agent, respectively. The effect of the concentration of raw materials, the ratio of nCo/nAl and the amount of DEA on the phase composition, particle size and morphology as well as the chroma of the as-prepared pigments was investigated by means of XRD, TEM and calorimetric analysis. The results show that submicron spherical CoAl2O4 pigments with size in a range of 100-230 nm could be synthesized under the conditions of nCo/nAl=1:2, Co2+ concentration 0.05 mol/L and DEA 12%(V/V). The formation of spherical particles was analyzed from the point of view of kinetically controlled crystal growth in the presence of DEA. It follows that during the nucleation and growth process of the crystalline particles, DEA molecules can be adsorbed onto the edges and vertices of the particles in a highly oriented manner thus causing steric hindrance, which enable the spherical growth of the crystalline particles to be possible. © Copyright.


Zhang T.,Jingdezhen Ceramic Institute | Jiang W.H.,Jingdezhen Ceramic Institute | Jiang W.H.,Jiangxi Key Laboratory of Advanced Ceramic Materials | Liu J.M.,Jingdezhen Ceramic Institute | And 4 more authors.
Materials Science Forum | Year: 2016

Zircon whiskers were synthesized via non-hydrolytic sol-gel process combined with molten salt method by using anhydrous zirconium tetrachloride as zirconium source, TEOS as silicon source, anhydrous ethanol as solvent, and sodium molybdate as molten salt. The effects of heat treatment mode and cooling rate on the synthesis of zircon whiskers have been studied by means of XRD, FE-SEM, TG and TEM. The results indicate that well-developed whiskers can be prepared through heat treating the sample at 850℃ for 3 h followed by a furnace cooling process. The zircon whiskers which were fabricated by this heat treatment mode grew along the [001] direction and showed diameter of 50~100 nm and aspect ratio of 20~30. © 2016 Trans Tech Publications, Switzerland.


Zhang T.,Jingdezhen Ceramic Institute | Jiang W.,Jingdezhen Ceramic Institute | Jiang W.,Jiangxi Key Laboratory of Advanced Ceramic Materials | Feng G.,Jingdezhen Ceramic Institute | And 3 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2015

Zircon whiskers were synthesized by a non-hydrolytic sol-gel process combined with a molten salt method with anhydrous zirconium tetrachloride as zirconium source, tetraethylorthosilicate (TEOS) as silicon source, anhydrous ethanol as a solvent, sodium molybdate as a molten salt. The phase transition of zircon dry gel in the presence of the molten salt as well as the influences of molten salt, heat treatment temperature and holding time on the one-dimensional preferential growth of zircon crystal were investigated. The results show that the presence of molten salt can reduce the synthesis temperature of zircon and promote the one-dimensional growth of zircon. The zircon whiskers along the growth direction of [001], the diameter of 50-100 nm and the aspect ratio of 20-30 can be synthesized at 850 ℃ for 3 h. ©, 2015, Chinese Ceramic Society. All right reserved.


Wang S.-H.,Jingdezhen Ceramic Institute | Jiang W.-H.,Jingdezhen Ceramic Institute | Jiang W.-H.,Jiangxi Key Laboratory of Advanced Ceramic Materials | Feng G.,Jingdezhen Ceramic Institute | And 3 more authors.
Wuji Cailiao Xuebao/Journal of Inorganic Materials | Year: 2014

Zircon whisker was synthesized at 700℃ via non-hydrolytic Sol-Gel method using anhydrous zirconium tetrachloride (ZrCl4) as zirconium source, tetraethylorthosilicate (TEOS) as silicon source, lithium fluoride (LiF) as mineralizer, ethanol as solvent and carbon black as reducing agent. Thermogravimetric analysis and differential thermal analysis (TG-DTA), X-ray diffraction analysis (XRD) and transmission electron microscope (TEM) were employed to characterize the influences of adding ways and amount of carbon black on the synthesis and morphology of zircon whisker. The results show that the carbon black added in form of suspension is favorable to the one-dimension growth of zircon. When 6wt% carbon black is added, optimized zircon whiskers are achieved along the growth direction of [001], which diameter and aspect ratio are in the range of 30-90 nm and 6-15|, respectively. Because of carbon black reacting with oxygen to form carbon dioxide and monoxide, the adding way and amount of carbon black efficiently regulate the oxygen partial pressure in the reaction system. Reducing oxygen partial pressure can form more SiF4 gas, which is the basis of one-dimensional direction growth of zircon. However, excessively low oxygen partial pressure is against the ZrSiO4 formation. Therefore, appropriate oxygen partial pressure can promote the growth of zircon whisker.


Chen Y.-X.,Jingdezhen Ceramic Institute | Chen Y.-X.,Jiangxi Key Laboratory of Advanced Ceramic Materials | Hu Q.,Jingdezhen Ceramic Institute | Cao C.-E.,Jingdezhen Ceramic Institute | And 3 more authors.
Wuji Cailiao Xuebao/Journal of Inorganic Materials | Year: 2012

Nanosized spinel type cobalt blue pigments of CoAl2O4(AB2O4) were hydrothermally synthesized using CoCl2·6H2O, ZnCl2, AlCl3 and CrCl3·6H2O as raw materials. Colorimetric analysis, X-ray diffraction (XRD), transmission electron microscope (TEM) and High resolution transmission electron microscope(HRTEM) were employed to investigate the effects of various amounts of Zn2+ doping at A site and Cr3+ doping at B site and various hydrothermal temperatures on the coloration, crystal phase compositions, crystal size and interplanar spacing of the CoAl2O4 spinels. The results indicated that Zn2+ and Cr3+ doping cause incomplete crystal growth and result in smaller particles than that of undoped spinels obtained at the same hydrothermal conditions. Zn2+ doping at A site lowered the synthesis temperature of the spinel crystalline colorants. Co0.95Zn0.05Al2O4 pigments with good coloration were obtained at 230°C. The hues of the as-prepared pigments changed from blue to green with increased amount of Zn2+ doping, and the coloration of samples became lighter. Similarly, the hues of the pigments also changed from blue to green with increasing the amount of Cr3+, but the coloration became deeper. Zn2+ doped spinels are of better coloration than that of Cr3+ doped.

Loading Jiangxi Key Laboratory of Advanced Ceramic Materials collaborators
Loading Jiangxi Key Laboratory of Advanced Ceramic Materials collaborators