Microstructure Formation and Performance of Reactive Sintered Titanium Oxycarbide Base Ceramic-Ceramic Composites

2019 ◽  
Vol 799 ◽  
pp. 131-135
Author(s):  
Kristjan Juhani ◽  
Jakob Kübarsepp ◽  
Marek Tarraste ◽  
Jüri Pirso ◽  
Mart Viljus
Keyword(s):  
Phase Formation ◽  
Mechanical Performance ◽  
Aluminium Oxide ◽  
High Energy ◽  
Ceramic Composites ◽  
Oxide Ceramic ◽  
Reactive Sintering ◽  
Attritor Milling ◽  
Different Temperatures ◽  
And Performance

Reactive sintering is a process where synthesis reaction of the ceramic phases is combined with sintering (densification) of the composite. Dense lightweight titanium oxycarbide-aluminium oxide ceramic-ceramic composites were produced from titanium dioxide, carbon black as graphite source and aluminium precursors by high energy attritor milling, followed by reactive sintering. Titanium oxycarbide and aluminium oxide phases were synthesized during reactive sintering in situ. To investigate the microstructure evolution and phase formation, the specimens were sintered at different temperatures (600-1725 °C) in vacuum. Scanning electron microscopy and X-ray diffraction were used to analyze the microstructure and phase formation. Mechanical performance (hardness and fracture toughness) was evaluated.

scholarly journals Reactive sintering of B4c-TiB2 composites from B4 and TiO2 precursors

2020 ◽  
Vol 14 (4) ◽  
pp. 329-335
Author(s):  
Pavol Svec ◽  
Zuzana Gábrisová ◽  
Alena Brusilová
Keyword(s):  
Fracture Toughness ◽  
Boron Carbide ◽  
Titanium Diboride ◽  
Sintering Temperature ◽  
Secondary Phase ◽  
Ceramic Composites ◽  
Reactive Sintering ◽  
Different Temperatures ◽  
Carbide Matrix

The effect of sintering temperature in the interval from 1775 to 1850?C on the density, microstructure, hardness and fracture toughness of ceramic composites consisting of a boron carbide matrix and titanium diboride secondary phase was studied. The composites were hot pressed using in situ reaction between boron carbide and 40 wt.% of titanium dioxide additive. The samples were hot pressed at different temperatures but for the constant time of 60min, under the pressure of 35MPa in vacuum of 10 Pa. Both Vickers hardness and fracture toughness of the composites increased with the sintering temperature.Maximal hardness of 29.8GPa and fracture toughness of 6.9MPa?m1/2 were achieved for the composite with 29.6 vol.% of titanium diboride secondary phase sintered at the highest sintering temperature of 1850?C.

Prediction of formation of intermetallic compounds in diffusion couples

2007 ◽  
Vol 22 (6) ◽  
pp. 1502-1511 ◽  
Author(s):  
Huashan Liu ◽  
Hang Wang ◽  
Wenjun Zhu ◽  
Xiaoma Tao ◽  
Zhanpeng Jin
Keyword(s):  
Intermetallic Compounds ◽  
Phase Formation ◽  
Mechanical Performance ◽  
Nucleation And Growth ◽  
Interfacial Reactions ◽  
Diffusion Couples ◽  
New Model ◽  
Different Temperatures ◽  
Good Agreement

Formation of intermetallic compounds (IMCs) at the interface between two metals during soldering processing exerts much influence on the electrical and mechanical performance of integrate circuits (ICs). Considering both of the thermodynamic and kinetic factors (including nucleation and growth) on phase formation, a new model capable of predicting phase formation sequence at the interface between two metals with different structures has been proposed in this work. Application of this new model on the interfacial reactions between pure elemental pairs of metals such as Ni/Sn, Cu/In, Cu/Sn, and Co/Sn at different temperatures shows good agreement between predictions by this model and experimental observations.

Development of Fe-VC Cermet from Powder by In Situ Reaction Synthesis

2010 ◽  
Vol 431-432 ◽  
pp. 192-195
Author(s):  
Zhi Ping Sun ◽  
Bao Luo Shen
Keyword(s):  
Powder Metallurgy ◽  
Microstructural Analysis ◽  
High Energy ◽  
Cold Isostatic Pressing ◽  
Reaction Synthesis ◽  
Different Temperatures ◽  
And Performance ◽  
Microstructure And Performance

The present work studies the development of a 40Fe-60VC (vol-%) cermet by powder metallurgy techniques. The base powder was obtained by mechanical high energy milling to reduce both particle and reinforcement size in order to improve powder microstructure. The modified powder was compacted by uniaxial and cold isostatic pressing. The compacts were sintered in vacuum at different temperatures and times, and characterised by several techniques, including the determination of density and hardness, study by XRD to determine the constituents after sintering, and a complete microstructural analysis by SEM and TEM. The present study reveals that a Fe-VC cermet with favorable microstructure and performance can be obtained by in-situ reaction synthesis.

Preparation and Properties of Asymmetric Porous Aluminium-Oxide Ceramic Hollow Fibre Membranes

2013 ◽  
Vol 537 ◽  
pp. 87-91 ◽  
Author(s):  
Hai Bo Mu ◽  
Gui Zeng Hao ◽  
Xiao Wei Li ◽  
Bo Meng
Keyword(s):  
Phase Inversion ◽  
Bending Strength ◽  
Pure Water ◽  
Aluminium Oxide ◽  
Hollow Fibre ◽  
Effective Porosity ◽  
Asymmetric Structure ◽  
Oxide Ceramic ◽  
Separation Factors ◽  
And Performance

Asymmetric porous aluminium-oxide ceramic hollow fibre membranes have been prepared by the phase inversion / sintering technique. The effect of non-solvent such as ethanol, isopropanol and ethylene glycol monomethylether(2-methoxyethanol) on the geometry and performance of hollow fibres was investigated. Morphologies of Al2O3 ceramic hollow fibre membranes were characterized using a scanning electron microscope (SEM). The effective porosity and the mechanical strength were determined by Archimedes method, and three point method, respectively. The prepared Al2O3 hollow fibre membranes show the asymmetric structure with a finger-like layer and a sponge-like layer. The effective porosity of the prepared hollow fibre membranes exceeds 47%, and the bending strength of the hollow membranes exceeds 63 MPa. The Al2O3 hollow fibre membranes with moderate permeation characteristics for gas and pure water are prepared by the introduction of nonsolvent in membrane casting solution. The separation factors of H2 to N2 or CO2 of the hollow fibers with nonsolvent are over 2.0.

scholarly journals Phase formation and performance of solid state reactive sintered Ce0.8Gd0.2O2−δ - FeCo2O4 composites

2021 ◽  
Author(s):  
Liudmila Fischer ◽  
Kerstin Neuhaus ◽  
Christina Schmidt ◽  
Ke Ran ◽  
Patrick Behr ◽  
...  
Keyword(s):  
Solid State ◽  
Phase Formation ◽  
Oxygen Transport ◽  
Raw Materials ◽  
Low Cost ◽  
Promising Method ◽  
Dual Phase ◽  
Reactive Sintering ◽  
And Performance ◽  
Oxygen Transport Membrane

Reactive sintering of dual phase composites for the use as oxygen transport membrane is a promising method enabling lower sintering temperatures as well as low cost raw materials. Ce0.8Gd0.2O2−δ -...

Current progress and performance improvement of Pt/C catalysts for fuel cells

2020 ◽  
Vol 8 (46) ◽  
pp. 24284-24306
Author(s):  
Xuefeng Ren ◽  
Yiran Wang ◽  
Anmin Liu ◽  
Zhihong Zhang ◽  
Qianyuan Lv ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Energy Conversion ◽  
Performance Improvement ◽  
Electric Energy ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Carnot Cycle ◽  
High Energy Conversion Efficiency ◽  
And Performance

Fuel cell is an electrochemical device, which can directly convert the chemical energy of fuel into electric energy, without heat process, not limited by Carnot cycle, high energy conversion efficiency, no noise and pollution.

scholarly journals High‐Energy Nickel‐Cobalt‐Aluminium Oxide (NCA) Cells on Idle: Anode‐ versus Cathode‐Driven Side Reactions

2021 ◽  
Author(s):  
Alana Zülke ◽  
Yi Li ◽  
Peter Keil ◽  
Robert Burrell ◽  
Sacha Belaisch ◽  
...  
Keyword(s):  
Aluminium Oxide ◽  
High Energy ◽  
Side Reactions ◽  
Nickel Cobalt

scholarly journals Impact of Prolonged Exposure of Eleven Years to Hot Seawater on the Degradation of a Thermoset Composite

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2154
Author(s):  
Amir Hussain Idrisi ◽  
Abdel-Hamid I. Mourad ◽  
Muhammad M. Sherif
Keyword(s):  
Exposure Time ◽  
Prolonged Exposure ◽  
Mechanical Performance ◽  
Matrix Cracking ◽  
Pull Out ◽  
Strength Based ◽  
Different Temperatures ◽  
River Line ◽  
Composite Samples

This paper presents a long-term experimental investigation of E-glass/epoxy composites’ durability exposed to seawater at different temperatures. The thermoset composite samples were exposed to 23 °C, 45 °C and 65 °C seawater for a prolonged exposure time of 11 years. The mechanical performance as a function of exposure time was evaluated and a strength-based technique was used to assess the durability of the composites. The experimental results revealed that the tensile strength of E-glass/epoxy composite was reduced by 8.2%, 29.7%, and 54.4% after immersion in seawater for 11 years at 23 °C, 45 °C, and 65 °C, respectively. The prolonged immersion in seawater resulted in the plasticization and swelling in the composite. This accelerated the rate of debonding between the fibers and matrix. The failure analysis was conducted to investigate the failure mode of the samples. SEM micrographs illustrated a correlation between the fiber/matrix debonding, potholing, fiber pull-out, river line marks and matrix cracking with deterioration in the tensile characteristics of the thermoset composite.

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