Conductivity, microstructure and mechanical properties of tape-cast LATP with LiF and SiO2 additives

AbstractLATP sheets with LiF and SiO2 addition prepared by tape cast as electrolytes for solid-state batteries were characterized regarding conductivity, microstructure and mechanical properties aiming toward an optimized composition. The use of additives permitted a reduction of the sintering temperature. Rietveld analyses of the samples with additives revealed a phase mixture of NaSICON modifications crystallizing with rhombohedral and orthorhombic symmetry as a superstructure with space group Pbca. It seems that LiF acts as a sintering additive but also as a mineralizer for the superstructure of LATP. As general trend, higher LiF to SiO2 ratios led to lower porosities and higher values of elastic modulus and hardness determined by indentation testing, but the presence of the orthorhombic LATP leads to a decrease in the ionic conductivity. Micro-pillar testing was used to assess the crack growth behavior revealing weak grain boundaries.

Download Full-text

Optimizing the conductivity, microstructure and mechanical properties of tape-cast LATP with LiF and SiO2 additives

10.21203/rs.3.rs-829169/v1 ◽

2021 ◽

Author(s):

Jürgen Peter Gross ◽

Jürgen Malzbender ◽

Enkhtsetseg Dashjav ◽

Frank Tietz ◽

Ruth Schwaiger

Keyword(s):

Mechanical Properties ◽

Elastic Modulus ◽

Sintering Temperature ◽

General Trend ◽

Tape Casting ◽

Growth Behavior ◽

Crack Growth Behavior ◽

Microstructure And Mechanical Properties ◽

Solid State Batteries ◽

Tape Cast

Abstract LATP sheets with LiF and SiO2 addition prepared by tape casting as electrolytes for solid-state batteries were characterized regarding conductivity, microstructure and mechanical properties aiming towards an optimized composition. The use of additives permitted a lowering of the sintering temperature. As general trend, higher LiF to SiO2 ratios led to lower porosities. This decrease in the porosity corresponds to an increase of the ionic conductivity as well as higher values of elastic modulus and hardness determined by indentation testing. Micro-pillar testing was used to assess the crack growth behavior, revealing weak grain boundaries.

Download Full-text

Effects of Boron Addition on the Microstructure and Mechanical Properties of (Ti,Ta)(C,N)-Co Based Cermets

Metals ◽

10.3390/met9070787 ◽

2019 ◽

Vol 9 (7) ◽

pp. 787

Author(s):

Ernesto Chicardi ◽

Francisco José Gotor Martínez

Keyword(s):

Mechanical Properties ◽

Liquid Phase ◽

Intermetallic Compound ◽

Solid Solutions ◽

General Trend ◽

Liquid Phase Sintering ◽

Binder Phase ◽

Boron Addition ◽

Sintering Additive ◽

Microstructure And Mechanical Properties

In this work, a titanium–tantalum carbonitride based cermet, with cobalt as the binder phase and boron as a sintering additive, was developed by a mechanically induced self-sustaining reaction process using two different methodologies. The boron additive was added to prevent the formation of brittle intermetallic compounds generally formed during the liquid phase sintering step due to the excessive ceramic dissolution into the molten binder phase. A systematic study was carried out to understand the effects of boron addition on the nature of the phases, microstructure, and mechanical properties of cermets. With the boron addition, the formation of two different boride solid solutions, i.e., (Ti,Ta)B2 and (Ti,Ta)3B4, was observed. Moreover, the nature of the binder was also modified, from the (Ti,Ta)Co2 brittle intermetallic compound (for cermets without boron addition) to ductile and tough (Ti,Ta)Co3 and α-Co phases (for cermets with boron addition). These modifications caused, as a general trend, the increase of hardness and toughness in cermets.

Download Full-text

Fabrication of MgO/Graphene Composites by Combustion Synthesis and Spark Plasma Sintering

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.281.125 ◽

2018 ◽

Vol 281 ◽

pp. 125-130

Author(s):

Nan Lu ◽

Jia Xi Liu ◽

Gang He ◽

Jiang Tao Li

Keyword(s):

Mechanical Properties ◽

Combustion Synthesis ◽

Spark Plasma Sintering ◽

Sintering Temperature ◽

Ceramic Composites ◽

Combustion Reaction ◽

Sintering Additive ◽

Microstructure And Mechanical Properties ◽

Plasma Sintering ◽

Spark Plasma

MgO/Graphene ceramic composites were fabricated by combining combustion synthesis with spark plasma sintering. MgO/Graphene mixture powders were prepared by the combustion reaction between Mg powders and CO2 gas. Dense MgO/Graphene composites were fabricated by spark plasma sintering (SPS) using LiF as the sintering additive. The effect of the sintering temperature on microstructure and mechanical properties of the prepared MgO/Graphene ceramics was discussed. The sintering temperature of the MgO/Graphene mixture powders increased from 900°C to 1300°C. The highest density of 3.43g/cm3 and hardness of 2133MPa were obtained at 1100°C. Compared with monolithic MgO ceramics, the hardness of MgO/Graphene ceramics at the same sintering temperature was increased from 840MPa to 2133MPa.

Download Full-text

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.368-372.1764 ◽

2008 ◽

Vol 368-372 ◽

pp. 1764-1766 ◽

Cited By ~ 1

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.

Download Full-text

Effect of Sintering Temperature on Microstructure and Mechanical Properties of Hot-Pressed Fe/FeAl2O4 Composite

Crystals ◽

10.3390/cryst11040422 ◽

2021 ◽

Vol 11 (4) ◽

pp. 422

Author(s):

Kuai Zhang ◽

Yungang Li ◽

Hongyan Yan ◽

Chuang Wang ◽

Hui Li ◽

...

Keyword(s):

Mechanical Properties ◽

Bending Strength ◽

Sintering Temperature ◽

Raw Materials ◽

Hot Press ◽

Microstructure And Mechanical Properties ◽

Powder Particles ◽

Hot Press Sintering ◽

Sintering Method

An Fe/FeAl2O4 composite was prepared with Fe-Fe2O3-Al2O3 powder by a hot press sintering method. The mass ratio was 6:1:2, sintering pressure was 30 MPa, and holding time was 120 min. The raw materials for the powder particles were respectively 1 µm (Fe), 0.5 µm (Fe2O3), and 1 µm (Al2O3) in diameter. The effect of sintering temperature on the microstructure and mechanical properties of Fe/FeAl2O4 composite was studied. The results showed that Fe/FeAl2O4 composite was formed by in situ reaction at 1300 °C–1500 °C. With the increased sintering temperature, the microstructure and mechanical properties of the Fe/FeAl2O4 composite showed a change law that initially became better and then became worse. The best microstructure and optimal mechanical properties were obtained at 1400 °C. At this temperature, the grain size of Fe and FeAl2O4 phases in Fe/FeAl2O4 composite was uniform, the relative density was 96.7%, and the Vickers hardness and bending strength were 1.88 GPa and 280.0 MPa, respectively. The wettability between Fe and FeAl2O4 was enhanced with increased sintering temperature. And then the densification process was accelerated. Finally, the microstructure and mechanical properties of the Fe/FeAl2O4 composite were improved.

Download Full-text

Effects of MgO and Y2O3 on the Microstructure and Mechanical Properties of Al2O3 Ceramics

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.589-590.572 ◽

2013 ◽

Vol 589-590 ◽

pp. 572-577 ◽

Cited By ~ 2

Author(s):

Hua He Liu ◽

Han Lian Liu ◽

Chuan Zhen Huang ◽

Bin Zou ◽

Ya Cong Chai

Keyword(s):

Mechanical Properties ◽

Sintering Temperature ◽

Hot Press ◽

Composite Ceramics ◽

Microstructure And Mechanical Properties ◽

Suitable Amount ◽

Hot Press Sintering ◽

Grains Refinement ◽

Better Than

Al2O3-MgO, Al2O3-Y2O3 and Al2O3-MgO-Y2O3 composite ceramics were fabricated respectively by hot-press sintering technique. With the analysis of the mechanical properties and microstructure, it was found that single additive MgO could be more favorable to the grains’ refinement and densification than Y2O3; the composite additive including both MgO and Y2O3 was better than single additive MgO or Y2O3, because their interactions could improve the mechanical properties of the Al2O3 ceramics; The sintering temperature could be reduced by adding the suitable amount of composite additives.

Download Full-text