Charactering and Sintering of BaZrO3 Doped with TiO2

2011 ◽  
Vol 492 ◽  
pp. 312-315
Author(s):  
Cheng Zhang ◽  
Na Zhang ◽  
Dan Yu Jiang ◽  
Ling Cong Fan
Keyword(s):  
Solid State ◽  
Single Phase ◽  
Sintering Temperature ◽  
Full Density ◽  
Solid State Chemistry ◽  
Sintered Ceramic ◽  
Sintering Aid ◽  
Ceramic Block ◽  
Pure Phase ◽  
Low Levels

The high sintering temperatures required for solid-state derived powders is a significant obstacle inhibiting more widespread use of single pure phase BaZrO3with high density. The aim of this research was to reduce the sintering temperature whilst maintaining pure single phase BaZrO3. By using of sintering aid, such as TiO2additive, the pure perovskite BaZrO3powder have been fabricated with the solid state chemistry at 1250°C. Low levels of TiO2(3%) produced the pure BaZrO3particles with the smallest size, and the corresponding sintered ceramic has the density of 95% theoretical using sintering temperature as low as 1550°C. The microstructure of the particular ceramic with full density confirmed that the particle grain in ceramic block have shaped with the less pore and connected thickly.

Low-Temperature Sintering and Microwave Dielectric Properties of CaWO4-Mg2SiO4 Ceramics

2014 ◽  
Vol 933 ◽  
pp. 12-16 ◽  
Author(s):  
Chung Long Pan ◽  
Ping Cheng Chen ◽  
Tsu Chung Tan ◽  
Wei Cheng Lin ◽  
Chun Hsu Shen ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Solid State ◽  
Liquid Phase ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Liquid Phase Sintering ◽  
Low Temperature Sintering ◽  
Sintering Aids ◽  
Sintering Aid ◽  
Microwave Dielectric

The effect of V2O5addition on the microstructures and the microwave dielectric properties of 0.9CaWO4-0.1Mg2SiO4(9CWMS) ceramics prepared by conventional solid-state routes have been investigated. The V2O5were selected as liquid phase sintering aids to lower the sintering temperature of 9CWMS ceramics. A small amount of V2O5(0.25~1 wt%) were used for sintering aid and led to high densification at 1050°C. The dielectric properties of 9CWMS ceramics with V2O5additions are strongly dependent on the densification, the microstructure. As the amount of V2O5additives increased from 0.25 to 1.0 wt%, the dielectric constantsεrdecreased following the trend with density. The quality valuesQdecreased with the increase of V2O5amount for all sintering temperatures. The 0.25 wt% V2O5-doped 0.9CaWO4-0.1Mg2SiO4ceramicssintered at 1080°C for 2 h had the optimum dielectric properties: εr= 5.7;Q×f= 73000 (at 14 GHz).

Low-Temperature Sintering and Microwave Dielectric Properties of the Zn2SiO4 Ceramics

2009 ◽  
Vol 66 ◽  
pp. 104-107 ◽  
Author(s):  
Ying Dai ◽  
Yao Sun ◽  
Wen Chen
Keyword(s):  
Dielectric Properties ◽  
Solid State ◽  
Low Temperature ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Microwave Dielectric Properties ◽  
Low Temperature Sintering ◽  
Sintering Aid ◽  
Microwave Dielectric ◽  
Low Sintering Temperature

Willemite ceramics (Zn2SiO4) possess excellent millimeter-wave dielectric properties, but it also has a high sintering temperature above 1300°C by traditional solid-state reaction and relatively large negative τf value. Zn2SiO4 nanoparticles synthesized by Sol–Gel method were used to improve the sintering and dielectric properties of the Zn2SiO4 ceramics. Using the nanoparticles, Zn2SiO4 ceramics can be sintered at a low temperature, 1150°C and exhibited improved microwave dielectric properties of εr =6.62, Q × f=24500 GHz, τf =-59ppm/°C. By adding TiO2 with high positive τf value (+450 ppm/°C) and CuO as sintering aid, near zero τf value and low sintering temperature can be achieved. With 11wt% of TiO2 and 5 wt% of CuO, an εr value of 9.3, a Q × f value of 12200GHz and a τf value of -11 ppm/°C were obtained at 1000°C, confirming the promising potential of the CuO-added TiO2-Zn2SiO4 ceramics as candidate materials for low–temperature cofired ceramic (LTCC) devices.

The Effect of Sintering Aid on Fabrication of Three-Dimensional Carbonated Hydroxyapatite Porous Scaffolds

2019 ◽  
Vol 821 ◽  
pp. 3-9 ◽  
Author(s):  
Muhammad Syazwan Mohd Noor ◽  
Ahmad Fauzi Mohd Noor ◽  
Yanny Marliana Baba Ismail
Keyword(s):  
Mechanical Properties ◽  
Single Phase ◽  
Sintering Temperature ◽  
Three Dimensional ◽  
Porous Scaffolds ◽  
Secondary Phases ◽  
Sintering Aid ◽  
Carbonated Hydroxyapatite ◽  
Micro Cracks ◽  
Replication Technique

Three-dimensional (3D) carbonated hydroxyapatite (CHA) porous scaffolds were successfully fabricated via polyurethane (PU) replication technique. Two sets of porous CHA scaffolds were prepared using: 1) as-synthesized CHA slurry (SCHA) and (2) as-synthesized CHA slurry with the addition of sintering aid, magnesium hydroxide (SCHA+Mg (OH)2). The aim of this study was to investigate the influences of the addition of sintering aid in the fabrication of porous CHA scaffolds in terms of phase purity, crystallinity, architecture, and mechanical properties. Result suggested that both of the fabricated porous scaffolds remained as single phase B-type CHA and free of secondary phases. Interestingly, the use of Mg (OH)2 as sintering aid led to better internal architecture resulted in smoother surface and less micro-cracks/pores formation on the struts since the struts was found to be more densified as compared to SCHA scaffolds. In terms of mechanical properties, SCHA+ Mg (OH)2 scaffolds showed higher compressive strength, indicating that the use of Mg (OH)2 had successfully reduced the sintering temperature and improve the densification of porous scaffolds. Thus, SCHA+ Mg (OH)2 scaffolds was found to be a better choice of scaffold with respect to its handling, compaction strength and architecture with improve strut properties.

Thermoelectric properties of bulk MoSi2 synthesized by solid state microwave heating

2016 ◽  
Vol 30 (19) ◽  
pp. 1650234 ◽  
Author(s):  
Yu Lan ◽  
Mianyu Xie ◽  
Ting Ouyang ◽  
Song Yue
Keyword(s):  
Solid State ◽  
Microwave Heating ◽  
Single Phase ◽  
Sintering Temperature ◽  
Seebeck Coefficients ◽  
Long Duration ◽  
Powder Factor ◽  
High Efficient ◽  
Different Temperatures ◽  
Precursor Powders

In this research, single phase [Formula: see text]-MoSi2 was prepared by solid state hybrid microwave heating within 90 min at relatively low temperature 1273 K. Such precursor powders were then ball milled and sintered by microwave heating at different temperatures. The thermoelectric (TE) properties of MoSi2 bulks were investigated in the temperature range of 300–673 K. When the sintering temperature increases from 973 K to 1273 K, the electrical resistivity decreases significantly and the Seebeck coefficients increase obviously, leading to the maximum TE powder factor of [Formula: see text] at 673 K. These results demonstrate the feasibility of high efficient and economical synthesis of MoSi2 by microwave heating technique, with the final products having comparable TE performance in comparison to those from typical methods with long duration and energy-extensive consumption.

The Effect of Stoichiometry to the Phase Formation of Barium Titanate

2012 ◽  
Vol 620 ◽  
pp. 198-202 ◽  
Author(s):  
Meor Ahmad Faris ◽  
Cheow Keat Yeoh ◽  
W.M. Arif ◽  
Pei Leng Teh ◽  
Nadia Abdullah
Keyword(s):  
Titanium Dioxide ◽  
Solid State ◽  
Barium Titanate ◽  
High Purity ◽  
Single Phase ◽  
Sintering Temperature ◽  
Barium Carbonate ◽  
Secondary Phase ◽  
X Ray Diffraction ◽  
X Ray

This paper focus on the effect of different ratio between barium (Ba) and titanium (Ti) to the production of high purity of barium titanate (BT). On this research, the sample was prepared by solid-state reaction between barium carbonate (BaCO3) and titanium dioxide (TiO2) powder at constant sintering temperature of 1350 °C. The sample was prepared at different ratio of Ba:Ti which are 1:0.9, 1:0.95, 1:1, 1:1.05, 1:1.1. All sintered BT was characterized by X-ray diffraction (XRD). All existed phase on these samples was determined and analyzed. Sample from ratio 1:1 produced almost a single phase of BT. While; samples from other ratio produce secondary phase which is barium orthotitanate (Ba2TiO4).

The Sintering and Electrical Properties of La0.5Sr0.5Co0.96Ni0.04O3-δ Ceramics with B2O3- CuO Addition

2021 ◽  
Vol 1027 ◽  
pp. 3-9
Author(s):  
Yong Cheng Lu ◽  
Yuan Xun Li ◽  
Rui Peng ◽  
Da Ming Chen ◽  
Qing Hui Yang ◽  
...  
Keyword(s):  
Solid State ◽  
Bulk Density ◽  
Sintering Temperature ◽  
Solid State Reaction Method ◽  
Linear Shrinkage ◽  
Sintering Process ◽  
Sintering Aid ◽  
Shrinkage Curve ◽  
Reaction Method ◽  
Absolute Value

The performance of adding 0–3 wt% B2O3-CuO as a sintering aid to lower the sintering temperature of La0.5Sr0.5Co0.96Ni0.04O3-δ (LSCN) was investigated through solid-state reaction method. Results of linear shrinkage curve, bulk density, and microstructure indicated that BCu addition could promote the sintering process and enhance the densification of LSCN ceramics. With the increase of BCu content, low absolute value of TCR could be achieved, while the conductivity was deteriorated obviously. For LSCN ceramics sintered at 950 °C, the bulk density, conductivity, and TCR were worse than those sintered at higher temperatures. Consequently, the BCu-doped LSCN ceramics might not suitable for the application in the field of LTCC.

The Effects of K/Na Ratio on the Electrical Properties of (Li, Sb, Ta) Modified KNN Piezoelectric Ceramics at Reduced Temperature with KNbO3 as Sintering Aid

2014 ◽  
Vol 887-888 ◽  
pp. 299-304
Author(s):  
Meng Meng Jia ◽  
Jian Ma
Keyword(s):  
Solid State ◽  
Electrical Properties ◽  
Sintering Temperature ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Sintering Aid ◽  
Solid State Sintering ◽  
Sintering Method ◽  
Reduced Temperature

0.95(Na0.95-xKxLi0.05)(Nb0.90Sb0.05Ta0.05)O3-0.05KNbO3 lead-free piezoelectric ceramics were prepared by the conventional solid-state sintering method, the effects of K/Na ratio on the structure and electrical properties of the ceramics were studied in detail. The results show that the addition of the pre-calcined KNbO3 powder as sintering aid is very effective to improve the density and sinterability, and the ceramics could be well sintered at reduced temperature of 1060 °C as compared with the relatively higher sintering temperature of Li, Sb, Ta modified KNN ceramics reported in the literature at 1100-1220 °C. The ceramics with x=0.44 possess the optimal properties: d33=231 pC/N, kp= 47 %, Pr= 22 μC/cm2, and Ec= 11.4 kV/cm.

Synthesis of Polycrystalline LaYO3 with Different Sintering Temperature

2015 ◽  
Vol 819 ◽  
pp. 117-122 ◽  
Author(s):  
N.A. Shafiqa ◽  
M.S. Idris ◽  
C.A. Salmie Suhana ◽  
R.A.M. Osman ◽  
T.Q. Tan
Keyword(s):  
Single Phase ◽  
Sintering Temperature ◽  
Xrd Analysis ◽  
Solid State Reaction Method ◽  
Scanning Electron Micrographs ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Pure Phase ◽  
Perovskite Ceramic

Synthesis of LaYO3 was carried out via conventional solid state reaction method. The polycrystalline samples were sintered at temperatures in the range of 1300 °C to 1500 °C with each deviation is 50 °C. X-ray diffraction (XRD) analysis indicated that the perovskite ceramic obtained its single phase at 1500 °C with ordered monoclinic perovskite structure. The pure phase sample showed 98.79 % relative density and scanning electron micrographs also proved that the porosity of the sample reduced when sample undergo sintering.

Preparation of PMZN Piezoceramic Using Sol-Autocombustion Synthesized PZT Powder as a Base

2007 ◽  
Vol 280-283 ◽  
pp. 219-222
Author(s):  
Hua Jun Sun ◽  
Wen Chen ◽  
Qing Xu ◽  
Jing Zhou ◽  
Xiao Fang Liu
Keyword(s):  
Solid State ◽  
Electrical Properties ◽  
Perovskite Structure ◽  
Piezoelectric Ceramic ◽  
Single Phase ◽  
Piezoelectric Properties ◽  
Sintering Temperature ◽  
Solid State Reaction Method ◽  
Reaction Method ◽  
Dielectric And Piezoelectric Properties

Using Zr(NO3)4.5H2O as Zr source, PZT powder with a single-phase perovskite structure was synthesized by a sol-autocombustion method at a calcining temperature of 700°C. Compared with a solid-state reaction method, the calcining temperature of PZT can be lowered by 200°C when using the sol-autocombustion method. PMZN ceramic was prepared at a sintering temperature of 1050°C with the resulting PZT powder as a base, which can lower the sintering temperature by 150°C. The microstructure of the PMZN ceramic was investigated by XRD and SEM, and the dielectric and piezoelectric properties were measured. The results showed that the PMZN piezoelectric ceramic has a tetragonal perovskite structure, showing the main electrical properties as follows: Kp = 0.54, Qm = 1073, tgd £ 0.001, e33 T/ e0 = 1236, d33 = 454pC/N, and fs =136.1KHz.

Mechanical Properties of CaB6 Sintered Body

2005 ◽  
Vol 297-300 ◽  
pp. 2707-2712
Author(s):  
Guang Hui Min ◽  
Li Xia Yang ◽  
Hua Shun Yu ◽  
Jiande Han
Keyword(s):  
Fracture Toughness ◽  
Fracture Surface ◽  
Intergranular Fracture ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Fracture Morphology ◽  
Sintered Body ◽  
Full Density ◽  
Transgranular Fracture ◽  
Sintering Aid

In this paper, CaB6 sintered body was fabricated by hot-pressed sintering with/without nickel as a sintering aid. The microstructure and fracture morphology were observed by means of SEM. CaB6 polycrystalline hot-pressed at 2123K showed insufficient densification. Fracture surface revealed that the existence of pores and the poor grain boundaries made the occurrence of intergranular fracture. When 28wt% nickel was added, nearly full density was obtained, although the sintering temperature is 200K lower. Hardness, Bending strength and fracture toughness of polycrystalline CaB6 were measured. By adding the Ni in CaB6 matrix, the flexural strength and the fracture toughness were enhanced, and the ratio of transgranular to intergranular fracture type was increased notably. The fracture surface showed a transgranular fracture. The crack bridging, micro-cracking and crack deflecting were deemed as the contribution to the improved fracture toughness.

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