Preparation and Performance of Zirconia Fiber Board

2018 ◽  
Vol 281 ◽  
pp. 912-917
Author(s):  
Liu Shi Tao ◽  
Yu Feng Chen ◽  
Shi Chao Zhang ◽  
Ke Wei Deng ◽  
Hao Ran Sun ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Bending Strength ◽  
Soluble Starch ◽  
Zirconia Powder ◽  
Strength Performance ◽  
Long Time ◽  
Zirconia Fiber ◽  
And Performance ◽  
High Temperature Calcination

Zirconia fiber not only can be used for a long time in 1600°C, but also has low thermal conductivity at high temperature. Due to the excellent insulation performance, it has a broad application prospect in aerospace, aviation, energy and other areas. In the present study, we chose yttrium stabilized zirconia fibers and nanometer zirconia powder as main material and adding soluble starch, zirconium sol as low temperature and high temperature binder. Rigid zirconia fiber board was prepared by material slurry, filter shaping, stripping drying and high temperature calcination. After high temperature calcination of 1600°C for 12h, sample pore are mainly concentrated in 25-75μm, bending strength performance is best when the adding amount of nanometer zirconia powder was 7%, the thermal conductivity is only 0.132 W·m-1·K-1 at 1400°C.

scholarly journals Study of the Comparative Effect of Sintering Methods and Sintering Additives on the Microstructure and Performance of Si3N4 Ceramic

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2142 ◽  
Author(s):  
Liangliang Yang ◽  
Allah Ditta ◽  
Bo Feng ◽  
Yue Zhang ◽  
Zhipeng Xie
Keyword(s):  
Phase Transition ◽  
Thermal Conductivity ◽  
Fracture Toughness ◽  
Relative Density ◽  
Transition Rate ◽  
Bending Strength ◽  
Si3n4 Ceramic ◽  
Sintering Additives ◽  
The Difference ◽  
And Performance

The Si3N4 ceramics were prepared in this study by gas pressure sintering (GPS) and spark plasma sintering (SPS) techniques, using 5 wt.% Yb2O3–2 wt.% Al2O3 and 5 wt.% CeO2–2 wt.% Al2O3 as sintering additives. Based on the difference in sintering methods and sintering additive systems, the relative density, phase composition, phase transition rate, microstructure, mechanical properties, and thermal conductivity were comparatively investigated and analyzed. SPS proved to be more efficient than GPS, producing higher relative density, bending strength, hardness, and thermal conductivity of Si3N4 ceramic with both additive systems; however, the phase transition rate and fracture toughness were lower. Similarly, higher bending strength, hardness, and thermal conductivity were achieved with Yb2O3–Al2O3 than CeO2–Al2O3 in the case of GPS and SPS, and only the relative density, fracture toughness, and phase transition rate were lower.

Facile synthesis and performance of Na-doped porous lithium-rich cathodes for lithium ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (62) ◽  
pp. 57310-57319 ◽  
Author(s):  
Di Wang ◽  
Meihong Liu ◽  
Xianyou Wang ◽  
Ruizhi Yu ◽  
Gang Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Lithium Ion Batteries ◽  
Solvothermal Method ◽  
Lithium Ion ◽  
Facile Synthesis ◽  
Calcination Process ◽  
And Performance ◽  
High Temperature Calcination

Na-doped porous lithium-rich (Li-rich) cathode microspheres (∼1 μm) were firstly prepared via the solvothermal method and subsequently a high-temperature calcination process.

Research on Microstructural and Performance Evolution of IN783 Bolt in Service

2021 ◽  
Vol 58 (3) ◽  
pp. 140-152
Author(s):  
J. Wang ◽  
Q. Zhao ◽  
J. Liu ◽  
Y. Wu ◽  
X. Du
Keyword(s):  
High Temperature ◽  
Normal Level ◽  
Service Time ◽  
Second Phase ◽  
Service Environment ◽  
Long Time ◽  
And Performance

Abstract In this paper, the evolution of the microstructural and performance of IN783 hightemperature bolts in service was studied. The results showed that under high-temperature service environment, with the increase of service time, the superalloy of IN783 bolt and the precipitation quantity of second phase increased. The second phase mainly existed in the form of particles and rods, which were distributed in an obvious oriented way. With the extension of service time, the strength of the alloy increased, but the hardness decreased, the plasticity and toughness decreased significantly, so it is difficult for the IN783 high-temperature bolts to reach the normal level of safe service. Therefore, the IN783 high-temperature bolts that have been in service for a long time should be strictly supervised and replaced appropriately to reduce losses.

Preparation of AlN-ZrO2(Ca) Composites by Hot Pressed Sintering

2011 ◽  
Vol 399-401 ◽  
pp. 347-350
Author(s):  
Xian Tao Chen ◽  
Jing Long Bu ◽  
Rong Lin Wang ◽  
Jun Xing Chen
Keyword(s):  
Thermal Conductivity ◽  
Phase Composition ◽  
Bending Strength ◽  
Performance Testing ◽  
Apparent Porosity ◽  
High Concentration ◽  
And Performance

AlN-ZrO2composites were prepared by hot pressed sintering with AlN particle (d≈2mm, d≈1.5mm and d≈1mm) and ZrO2powder as material. Its phase composition, thermal conductivity and sintering performance were investigated by XRD, SEM, EDS and performance testing. The results showed that AlN could be reserved in samples, and the thermal conductivity and the apparent porosity of the samples ascended with increase of the content of AlN, and the bending strength of the samples with same AlN particle occurred change according to V-shape with content of AlN increasing. Thereinto, the thermal conductivity of the samples with 1.5mm AlN was most excellent, amang samples with AlN particle of 2mm, 1.5mm and 1mm, and sintering performance of the samples with 1mm AlN was best. Particle interface of AlN and ZrO2was high concentration area of elements Ca and O, and was a structural loose crack area with CaAl12O19formed. The area is abominable for performances of AlN-ZrO2composites such as thermal conductivity, density and strength. It is more appropriate for preparation of AlN-ZrO2composites with AlN particle of 1.5mm and 1mm as materials.

scholarly journals Fabrication and Study on Thermal Conductivity, Electrical Properties, and Mechanical Properties of the Lightweight Carbon/Carbon Fiber Composite

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Bo Tang ◽  
Ying Wang ◽  
Jinhong Yu ◽  
Ke Yang ◽  
Yonggen Lu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Carbon Fiber ◽  
Bending Strength ◽  
Fiber Composite ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Resin Impregnation ◽  
Plane Direction ◽  
Long Carbon Fiber

In this paper, lightweight carbon/carbon fiber composite thermal field insulation materials were fabricated by the process method of long carbon fiber airflow netting-needle punching forming felt-resin impregnation-molding curing-high-temperature carbonization and graphitization. The microscopic morphology, conductivity, bending strength, and thermal conductivity of carbon/carbon fiber composites were measured by using the scanning electron microscope (SEM), four probes, electronic universal testing machine, and thermal analyzer. The results show that the long carbon fiber in the carbon/carbon fiber composite forms a three-dimensional structure of X-Y-Z with a density of 0.16 ± 0.02 g/cm3, which makes the composite material have excellent thermal insulation performance at high temperature, and the conductivity is 1452.4 S/m (plane direction) and 182.8 S/m (perpendicular to the plane direction), the compressive strength is 0.2 MPa (plane direction) and 1.31 MPa (perpendicular to the plane direction), the bending strength is 0.24 MPa (plane direction) and 1.1 MPa (perpendicular to the plane direction), and the thermal conductivity is 0.076 W/(mK) (25°C) and 0.17 W/(mK) (1200°C), respectively. The above process methods and test results will provide the application of the carbon/carbon fiber composite in the solar polysilicon furnace, single crystal silicon furnace, semiconductor furnace, sapphire furnace, fiber drawing furnace, and high-end metallurgical heat treatment furnaces, as well as applications in other high-temperature insulation environments, and also provide some suggestions in these insulation applications.

Study and Analysis on the High Temperature Performance of Calcined Bauxite

2014 ◽  
Vol 960-961 ◽  
pp. 7-10
Author(s):  
Bin Zheng Fang ◽  
Hui Li ◽  
Jian Wei Cao ◽  
Jian Feng Wu ◽  
Xiao hong Xu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Water Absorption ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Volume Density ◽  
Temperature Performance ◽  
Heat Storage Material ◽  
Testing Technology ◽  
Firing Line

In order to further broaden the application field of calcined bauxite, using XRF and other testing technology to study and analysis on the high temperature performance of calcined bauxite in this paper. The results showed that the sintering temperature range was 1300 ~ 1650°C, the firing line shrinkage, bulk density, bending strength, heat capacity and thermal conductivity was increased gradually, the water absorption and porosity was decreased, the water absorption, volume density and flexural strength of the sample fired at 1650°C were 0.93%, 3.20 g·cm-3 and 182.23 MPa, the specific heat and thermal conductivity were 0.83 kJ·(kg·K)-1 and 9.21 W·(m·K)-1. Due to the thermal performance of calcined bauxite is optimal, and is expected to be used for the field of high temperature solar thermal heat storage material.

Microstructural characterization of plasma-processed Ti-Al metal matrix composites

1989 ◽  
Vol 47 ◽  
pp. 552-553
Author(s):  
M. G. Burke ◽  
M. N. Gungor ◽  
M. A. Burke
Keyword(s):  
High Temperature ◽  
Titanium Aluminide ◽  
Plasma Processing ◽  
Microstructural Characterization ◽  
High Temperature Strength ◽  
Matrix Composites ◽  
Intermetallic Matrix ◽  
Long Time ◽  
Strength And Stiffness ◽  
Intermetallic Matrix Composites

Intermetallic matrix composites are candidates for ultrahigh temperature service when light weight and high temperature strength and stiffness are required. Recent efforts to produce intermetallic matrix composites have focused on the titanium aluminide (TiAl) system with various ceramic reinforcements. In order to optimize the composition and processing of these composites it is necessary to evaluate the range of structures that can be produced in these materials and to identify the characteristics of the optimum structures. Normally, TiAl materials are difficult to process and, thus, examination of a suitable range of structures would not be feasible. However, plasma processing offers a novel method for producing composites from difficult to process component materials. By melting one or more of the component materials in a plasma and controlling deposition onto a cooled substrate, a range of structures can be produced and the method is highly suited to examining experimental composite systems. Moreover, because plasma processing involves rapid melting and very rapid cooling can be induced in the deposited composite, it is expected that processing method can avoid some of the problems, such as interfacial degradation, that are associated with the relatively long time, high temperature exposures that are induced by conventional processing methods.

WIELAND-K88

Alloy Digest ◽  
2005 ◽  
Vol 54 (12) ◽  
Keyword(s):  
Thermal Conductivity ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Stress Relaxation ◽  
Copper Alloy ◽  
Elevated Temperatures ◽  
Heat Treating ◽  
Relaxation Resistance ◽  
Temperature Performance ◽  
Very High

Abstract Wieland K-88 is a copper alloy with very high electrical and thermal conductivity, good strength, and excellent stress relaxation resistance at elevated temperatures. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: CU-738. Producer or source: Wieland Metals Inc.

UNS N06455

Alloy Digest ◽  
1989 ◽  
Vol 38 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Stress Corrosion Cracking ◽  
Temperature Stability ◽  
Heat Treating ◽  
High Ductility ◽  
High Temperature Stability ◽  
Nickel Chromium ◽  
Long Time ◽  
Resistance To Stress

Abstract UNS NO6455 is a nickel-chromium-molybdenum alloy with outstanding high-temperature stability as shown by high ductility and corrosion resistance even after long-time aging in the range 1200-1900 F. The alloy also has excellent resistance to stress-corrosion cracking and to oxidizing atmospheres up to 1900 F. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-367. Producer or source: Nickel and nickel alloy producers.

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