Preparation of Bi3.6Ho0.4Ti3O12 Ceramics by Hot-Press Sintering

2012 ◽  
Vol 508 ◽  
pp. 253-256
Author(s):  
Chuan Bin Wang ◽  
L. Fu ◽  
Qiang Shen ◽  
Lian Meng Zhang
Keyword(s):  
Solid State ◽  
Relative Density ◽  
Solid State Reaction ◽  
Applied Pressure ◽  
Pressureless Sintering ◽  
Hot Press ◽  
Phase Density ◽  
Densification Temperature ◽  
Hot Press Sintering ◽  
Calcined Temperature

Hot-Press Sintering, a Method that Could Effectively Decrease the Densification Temperature due to the Applied Pressure, Was Employed to Prepare a New Kind of Ho3+ Doped Bi4Ti3O12 Ceramics, Bi3.6Ho0.4Ti3O12. The Effect of Preparation Parameters on the Crystal Phase, Density and Microstructure of the Ceramics Were Investigated. at First, Single-Phased Bi3.6Ho0.4Ti3O12 Powders Were Synthesized from Bi2o3, Tio2 and Ho2o3 Raw Powders by Solid-State Reaction and the Optimum Calcined Temperature Should Be 900 °C. The as-Synthesized Powders Were Further Densified at 750-900 °C to Prepare Bi3.6Ho0.4Ti3O12 Ceramics. Dense (relative Density Was 99.4 %) Bi3.6Ho0.4Ti3O12 Ceramics with a Compact Texture Were then Obtained by Hot-Press at 850 °C, about 150-200 °C Lower as Compared with Pressureless Sintering.

Effect of Sintering Process on Microstructure of Al2O3/LiTaO3 Composite Ceramics

2007 ◽  
Vol 336-338 ◽  
pp. 2363-2365
Author(s):  
You Feng Zhang ◽  
Yu Zhou ◽  
De Chang Jia ◽  
Qing Chang Meng
Keyword(s):  
Grain Boundaries ◽  
Relative Density ◽  
Theoretical Density ◽  
Pressureless Sintering ◽  
Sintering Process ◽  
Hot Press ◽  
Composite Ceramics ◽  
Fine Grained ◽  
N2 Atmosphere ◽  
Hot Press Sintering

Effects of different sintering methods such as pressureless sintering and hot press sintering on relative density and microstructure of the Al2O3p/LiTaO3 (ALT) composite ceramics were investigated to obtain a preferable sintering process. Relative densities of all ALT composites are below 90% when sintered with the cold isostatical pressing followed by pressureless sintering at temperatures of 1250 to 1350°C. The relative densities and microstructure of ALT composite ceramics with the hot press sintering process in a N2 atmosphere at 1150 and 1300°C were investigated. The relative density of ALT composite hot pressed at 1150°C is only 77%, and almost theoretical density at 1300°C. This indicates that sintering pressure plays an important role in the densification of ALT composite ceramics in temperature range of 1150 to 1350°C. Investigation on morphologies of the composites shows that the Al2O3 particles distributed along grain boundaries of LiTaO3, which leads to a fine-grained microstructure in the ALT composite ceramics

Enhanced thermoelectric properties of BaZn2Sb2via a synergistic optimization strategy using co-doped Na and Sr

2016 ◽  
Vol 4 (31) ◽  
pp. 12119-12125 ◽  
Author(s):  
Ruijuan Yan ◽  
Wanyu Lv ◽  
Ke Wang ◽  
Kai Guo ◽  
Xinxin Yang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Solid State ◽  
Power Factor ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Optimization Strategy ◽  
Hot Press ◽  
Reaction Method ◽  
Hot Press Sintering ◽  
Co Doped

Polycrystalline samples of Ba1−x−yNaxSryZn2Sb2 (0 ≤ x ≤ 0.1, 0 ≤ y ≤ 0.1) were prepared by a solid-state reaction method and hot press sintering with the aim of achieving synergistic optimization of the power factor and thermal conductivity.

A Study on SrCe0.9Y0.1O3-α Synthesized by Solid State Reaction and the Liquid Citrate Method

2007 ◽  
Vol 336-338 ◽  
pp. 409-412
Author(s):  
Jun Feng ◽  
Jing Hua Gu ◽  
Yue Zhang ◽  
Wei Shen Yang
Keyword(s):  
Solid State ◽  
Electrical Properties ◽  
Relative Density ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Reaction Method ◽  
Citrate Method

The solid-state reaction method and the liquid citrate method were used respectively to synthesize SrCe0.9Y0.1O3-α (SCY10) powders. SCY10 membranes were prepared from each kind of the powders by sintering at 1450°C for 10 hours. XRD was employed to examine the phase of the powders and the membranes. The microstructure of the membranes was observed with SEM. The sintering ability and electrical properties of the membranes were investigated. The results indicate that the membrane prepared from SCY10 powder synthesized by the liquid citrate method has higher relative density and nearly the same conductivity, compared with the membrane prepared from SCY10 powder synthesized by solid-state reaction.

Effect of Iron Additive on the Sintering Behavior of Hot-Pressed ZrC-W Composites

2008 ◽  
Vol 368-372 ◽  
pp. 1764-1766 ◽  
Author(s):  
Yu Jin Wang ◽  
Lei Chen ◽  
Tai Quan Zhang ◽  
Yu Zhou
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Flexural Strength ◽  
Relative Density ◽  
Sintering Temperature ◽  
Sintering Behavior ◽  
Hot Press ◽  
Sintering Additive ◽  
Microstructure And Mechanical Properties ◽  
Hot Press Sintering

The ZrC-W composites with iron as sintering additive were fabricated by hot-press sintering. The densification, microstructure and mechanical properties of the composites were investigated. The incorporation of Fe beneficially promotes the densification of ZrC-W composites. The relative density of the composite sintered at 1900°C can attain 95.3%. W2C phase is also found in the ZrC-W composite sintered at 1700°C. The content of W2C decreases with the increase of sintering temperature. However, W2C phase is not identified in the composite sintered at 1900°C. The flexural strength and fracture toughness of the composites are strongly dependent on sintering temperature. The flexural strength and fracture toughness of ZrC-W composite sintered at optimized temperature of 1800°C are 438 MPa and 3.99 MPa·m1/2, respectively.

Study of Wear Properties in β-SiC(w+p)/Cu Composite by Hot-Press Sintering

2014 ◽  
Vol 1030-1032 ◽  
pp. 280-283
Author(s):  
Li Li Tang ◽  
Ming Hu ◽  
Lin Shan ◽  
Yun Long Zhang
Keyword(s):  
Friction Coefficient ◽  
Relative Density ◽  
Electroless Plating ◽  
Volume Fraction ◽  
Hot Press ◽  
Wear Properties ◽  
Wear Resistant ◽  
The Poor ◽  
Sic Particles ◽  
Hot Press Sintering

Electroless plating technology was applied in order to improve the poor wettability between copper and SiC. β-SiC(w+p)/Cu composites were fabricated by hot-press sintering. The influences of SiC volume fraction on microstructure, relative density and wear propertity were researched in detail. It turned out that SiC particles and wiskers distributed in Cu matrix homogeneously. And with the increase of SiC volume fraction, the relative density and friction coefficient were reduced respectively, the wear-resistant improved greatly.

Effect of Sintering Time on the Properties of LaYO3 Doped with ZrO2 Solid Electrolyte

2013 ◽  
Vol 795 ◽  
pp. 513-517 ◽  
Author(s):  
Che Abdullah Salmie Suhana ◽  
N.S. Hazwani ◽  
N.A. Shafiqa ◽  
W.N. Imaduddin Helmi
Keyword(s):  
Solid State ◽  
Solid Electrolyte ◽  
Relative Density ◽  
Electron Micrographs ◽  
Solid State Reaction ◽  
Scanning Electron Micrographs ◽  
Sintering Time ◽  
Scanning Electron

LaYO3 doped-ZrO2 ceramic with the composition La0.95Zr0.05YO3+δ was prepared via the solid state reaction. The samples were sintered at 1450 °C and sintering times in range of 6-15 hours have been varied for both doped and base samples in order to study its effect on its properties. The results showed that relative density increased remarkably with sintering time. The highest relative density was observed for the samples sintered for 15 hours. Scanning electron micrographs also proved that the porosity of the samples reduced when samples sintered for the longer time.

Hot Press Sintering Behavior of Nano-Sized AlN Powders

2010 ◽  
Vol 105-106 ◽  
pp. 720-722
Author(s):  
Hong Bo Li ◽  
Jun Ting Luo ◽  
Yong Fei Gu ◽  
Yan Xia Xu
Keyword(s):  
Grain Size ◽  
Relative Density ◽  
Elevated Temperatures ◽  
Sintering Temperature ◽  
Hexagonal Wurtzite Structure ◽  
Sintering Behavior ◽  
Mechanical Resistance ◽  
Hot Press ◽  
Average Grain Size ◽  
Hot Press Sintering

Aluminum nitride (AlN) is a stoichiometric compound with the hexagonal wurtzite structure. AlN has excellent thermal conductivity and good properties as electronic insulator. It displays good mechanical resistance up to elevated temperatures and is resistant against corrosion by molten metals. Bulk AlN may therefore be used as a refractory structural material as well as a substrate for high power microelectronic devices. However, it is very difficult for sintering high-density AlN at lower temperature than 1800°C. Nano-sized AlN powders were sintered by hot press sintering at low temperature of 1500~1700°C and mechanical properties were investigated. β-AlN and β-Al2O3 were detected when the sintering temperature is 1600°C. The phase transition β-AlN to α-AlN was discovered at a 1700°C sintering temperature. Relative density and average grain size were increasing with the increasing of sintering temperature, and fracture form is intercrystalline crack in 1500°C and transcrystalline crack in 1700°C. 97.3% relative density and 850nm average grain size were deserved at 1700°C.

Influences of SiC Particle Size and Electroless Plating on the Properties of SiCp/Cu Composites

2014 ◽  
Vol 1030-1032 ◽  
pp. 103-107
Author(s):  
Li Li Tang ◽  
Ming Hu ◽  
Lin Shan ◽  
Yun Long Zhang
Keyword(s):  
Thermal Expansion ◽  
Relative Density ◽  
Electroless Plating ◽  
Bending Strength ◽  
Coefficient Of Thermal Expansion ◽  
Hot Press ◽  
The Poor ◽  
Sic Particles ◽  
Hot Press Sintering ◽  
Sic Particle

Electroless plating technology was applied in order to improve the poor wettability between the copper and SiC. SiCp/Cu composites were frbricated by hot-press sintering technique. The influences of SiC particles (Cu-coated and Cu-uncoated) and SiCp/Cu-5vol%n-SiC on microstructures, relative density, bending strength and coefficient of thermal expansion(CTE) were researched in detail. The results show that SiC particles distributed in Cu matrix uniformly. And a certain amount of SiC, the relative density and bending strength of SiCp/Cu(Cu-coated) composite were greater than SiCp/Cu(Cu-uncoated) composite, and the coefficient of thermal expansion was opposite, Between SiCp/Cu(Cu-coated) and SiCp/Cu-5vol% nanoscale SiC(n-SiC), the relative density and bending strength of SiCp/Cu(Cu-coated) were more than SiCp/Cu-5vol%n-SiC, and CTE was different.

Hot-Press Sintering of the W-40wt.%Cu Composite Tape-Casting Film

2017 ◽  
Vol 727 ◽  
pp. 966-971
Author(s):  
Chuan Bin Wang ◽  
Kong Fei Sun ◽  
Guo Qiang Luo ◽  
Jian Zhang ◽  
Qiang Shen ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Relative Density ◽  
Vickers Hardness ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Tape Casting ◽  
Hot Press ◽  
Composite Tape ◽  
Mechanical And Electrical Properties ◽  
Hot Press Sintering

In this research, the W-40wt.%Cu composite tape-casting films were prepared through the vacuum hot-press sintering method, and the effect of sintering temperature on the microstructures and properties of the W-40wt.%Cu composite samples was studied. Microstructures of the W-40wt.%Cu tape-casting film and the prepared samples were analyzed by field emission scanning electron microscopy (FE-SEM). The phase of the samples was investigated by X-ray diffraction (XRD). The relative density, Vickers hardness, bending strength and electrical conductivity of the samples were investigated. The results show that the relative density of the W-40wt.%Cu composite materials enhances with the increasing of the sintering temperature, at the same time the mechanical and electrical properties are better with the increasing of the sintering temperature. The W-40wt.%Cu composites prepared at the condition of 900°C-200MPa-2h have the relative density of 97%, the bending strength of 507.3MPa, the Vickers hardness of 376.2HV and the electrical conductivity of 32.5% IACS, respectively.

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