Donor Solid Solubility and Microstructure of Nb-Doped TiO2 Ceramic Varistor

2012 ◽  
Vol 512-515 ◽  
pp. 1273-1276
Author(s):  
Rui Jiao Jia ◽  
Ji Kang Yan ◽  
Guo You Gan ◽  
Jing Hong Du ◽  
Jian Hong Yi
Keyword(s):  
Solid Solubility ◽  
Sintering Temperature ◽  
Chemical Compositions ◽  
Varistor Ceramic ◽  
Microstructure And Properties ◽  
Ceramic Varistor

In this paper, the effect of sintering temperature on microstructure and donor solid solubility of Nb-doped TiO2 varistor ceramic is investigated. SEM and EDXS were carried out to study the microstructure and chemical compositions of TiO2 grain. The results show that the TiO2 sample sintered at 1350°C have better microstructure and properties. The grains size of the TiO2 sample is about 15μm and solid solubility of donor Nb 5+ cation solute in TiO2 grains is 1.49mol%.

Effects of Sintering Temperature on Microstructure and Properties in TiO2 Varistor Ceramics

2010 ◽  
Vol 105-106 ◽  
pp. 324-328 ◽  
Author(s):  
Ji Kang Yan ◽  
Guo You Gan ◽  
Jing Hong Du ◽  
Jia Lin Sun
Keyword(s):  
Dielectric Constant ◽  
Electrical Properties ◽  
Solid Solubility ◽  
Sintering Temperature ◽  
Relative Dielectric Constant ◽  
Chemical Compositions ◽  
Barrier Structure ◽  
Tio2 Sample ◽  
Linear Coefficient ◽  
Microstructure And Properties

The effects of sintering temperature on microstructure, micro-composition, barrier structure and electrical properties of TiO2 varistors ceramics were investigated. The microstructures and chemical compositions of grains in TiO2 ceramics were measured by SEM and EDS. Based on the thermo electronic emission theory, Grain boundaries barrier structure was calculated by analyzing electrical properties of samples. The sample sintered at 1350°C exhibits better microstructure and properties. The grains size of the TiO2 sample sintered at 1350°C is about 15m, and other electrical properties are as follows: solid solubility of donor doping Nb5+ cation solute in TiO2 grains of 1.49mol%, barriers height of 0.28ev, barriers width of 48nm, varistor voltages of 5.25V/mm, non-linear coefficient of 4.2 and relative dielectric constant of 1.1×104.

Microstructure and Properties of Calcium Borosilicate and Borosilicate Glass-Ceramic Composites

2008 ◽  
Vol 368-372 ◽  
pp. 1422-1425 ◽  
Author(s):  
An Guo Lu ◽  
Tai Qiu
Keyword(s):  
Borosilicate Glass ◽  
Glass Ceramic ◽  
Mass Fraction ◽  
Sintering Temperature ◽  
Coefficient Of Thermal Expansion ◽  
Ceramic Composites ◽  
Glass Content ◽  
Microstructure And Properties ◽  
Calcium Borosilicate ◽  
Crystal Phases

Calcium borosilicate (CaO-B2O3-SiO2, CBS) glass based glass-ceramic composites were prepared by introducing borosilicate glass. The effects of borosilicate glass and firing temperature on the microstructure and properties of the glass-ceramic composites were investigated. The results showed that the composites containing 0~40% (in mass fraction, the same below) borosilicate glass can be sintered at 850°C. The dielectric constant (εr) decreases with the increase of borosilicate glass content and can be adjusted in the range of 5.6~6.6. The coefficient of thermal expansion (CTE) increases with the increase of borosilicate glass content. Increasing sintering temperature favors the precipitations of crystal phases, which have lower εr than CBS glass, resulting in the decrease of εr for the composites.

scholarly journals Effects of sintering temperature on microstructure and properties of sanitaryware ceramic produced with waste material

Cerâmica ◽  
2021 ◽  
Vol 67 (381) ◽  
pp. 39-47
Author(s):  
E. Martini ◽  
A. Pavese ◽  
D. Tabacchi ◽  
D. M. Fortuna ◽  
A. Fortuna
Keyword(s):  
Sintering Temperature ◽  
Waste Material ◽  
Microstructure And Properties

Performance of (Y2O3,V2O5) Co-Doping TiO2 Ceramics

2016 ◽  
Vol 697 ◽  
pp. 271-274
Author(s):  
Gui Min Jiang ◽  
Ji Kang Yan ◽  
Gang Yang ◽  
Zhi Cao Duan ◽  
Kun Yong Kang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Sintering Temperature ◽  
Nonlinear Coefficient ◽  
Electrical Performance ◽  
Varistor Ceramic ◽  
Co Doping

The present study investigated the effect of the sintering temperature and (Y2O3, V2O5) co-doping on the performance of TiO2 varistor ceramic which has lower varistor voltage and high nonlinear coefficient. The results showed that the TiO2-based varistor ceramic which doped with 0.35% mol and 0.25% mol of Y2O3 and V2O5 has good comprehensive electrical performance and excellent dielectric constant sintered at 1200°C. Its varistor voltage V1mA is 38.1V, nonlinear coefficient is 4.6.

Effect of sintering temperature on microstructure and properties of MIM420 stainless steel

2021 ◽  
pp. 1-8
Author(s):  
Zheng Huang ◽  
Xingquan Jiang ◽  
Duxin Li ◽  
Zhongchen Yang ◽  
Renwei Lu
Keyword(s):  
Stainless Steel ◽  
Sintering Temperature ◽  
Microstructure And Properties

scholarly journals Influence of Various Process Parameters on the Density of Sintered Aluminium Alloys

10.14311/1604 ◽  
2012 ◽  
Vol 52 (4) ◽  
Author(s):  
Mateusz Laska ◽  
Jan Kazior
Keyword(s):  
Sintered Density ◽  
Sintering Temperature ◽  
Compaction Pressure ◽  
Nitrogen Atmosphere ◽  
Chemical Compositions ◽  
Green Density ◽  
Heating And Cooling ◽  
Wide Range ◽  
Different Temperatures ◽  
Metallurgy Industry

This paper presents the results of density measurements carried out on Alumix sintered parts. ECKA Alumix aluminium powders were used because of their wide application in the powder metallurgy industry. The compacts were produced using a wide range of compaction pressures for three different chemical compositions. The compacts were then sintered under a pure dry nitrogen atmosphere at three different temperatures. The heating and cooling rates were the same throughout the entire test. The results showed that the green density increases with compaction pressure, but that sintered density is independent of green density (compaction pressure) for each sintering temperature.

Effects of nano-carbon doping and sintering temperature on microstructure and properties of MgB2

2009 ◽  
Vol 469 (15-20) ◽  
pp. 1182-1185 ◽  
Author(s):  
Jun Hyung Lim ◽  
Jong Hyun Shim ◽  
Jun Hyuk Choi ◽  
Jin Hyun Park ◽  
Won Kim ◽  
...  
Keyword(s):  
Sintering Temperature ◽  
Carbon Doping ◽  
Microstructure And Properties ◽  
Nano Carbon

Effect of Sintering Temperature on Microstructure and Properties of VС/Fe Composite

2012 ◽  
Vol 430-432 ◽  
pp. 978-983
Author(s):  
Guo Jun Zhang ◽  
Zhi Ping Sun ◽  
Li Yan Zou
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Sintering Temperature ◽  
Growth Trend ◽  
Flexure Strength ◽  
Microstructure And Properties ◽  
Whole Process ◽  
Relationship Of ◽  
The Relationship ◽  
Composite Samples

VC/Fe composite samples were fabricated by sintering at 1050, 1100 and 1150°C in vacuum. The microstructure and mechanical properties of samples were examined, and the relationship of structure and mechanical properties for VC/Fe composite sintered at different temperature were studied. The results show that fracture toughness, hardness and density is increasing obviously at 1050-1100°Cwith the increasing sintering temperature, but the growth trend increases slowly at 1100-1150°C; in whole process with temperature increased, Flexure strength heighten trend obviously. The microstructure of VC/Fe composite changed from particles piled up together to the microstructure particles closely, VC particles set gradually into Fe with temperature increased, and the gap reduced gradually.

Effect of sintering temperature on microstructure and properties of SiC coatings for carbon materials

2008 ◽  
Vol 202 (13) ◽  
pp. 3094-3099 ◽  
Author(s):  
Zhanjun Liu ◽  
Quangui Guo ◽  
Lang Liu ◽  
Jingli Shi ◽  
Gengtai Zhai
Keyword(s):  
Carbon Materials ◽  
Sintering Temperature ◽  
Microstructure And Properties ◽  
Sic Coatings
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