In Situ Synthesis of Rod-Like Tielite / Alumina Ceramic Composites via Mechanical Activation

2007 ◽  
Vol 352 ◽  
pp. 111-114
Author(s):  
Xiao Hu Chen ◽  
Xiao Min Chen ◽  
Huang Zhao ◽  
Ji Huai Wu
Keyword(s):  
Composite Materials ◽  
Mechanical Activation ◽  
Ceramic Composite ◽  
Ceramic Composites ◽  
Al2o3 Ceramic ◽  
Longitudinal Length ◽  
In Situ Formation ◽  
Ceramic Composite Materials ◽  
Α Al2o3

The purpose of this paper is to investigate the possibility of rod-like Al2TiO5 / α-Al2O3 composites in situ formation via a mechanical activation process. A QM-ISP-4 Planetary Mill was employed to activate mechanically the mixtures of anatase and corundum in air at room temperature for different times. The milled powder mixtures were pressed into platelets and then sintered in air at 1300°C for 3 h. The XRD results showed that only Al2TiO5 and α-Al2O3 phases could be detected in the sintered samples when the activated time reached 30 hours. The SEM observations illustrated the unusual microstructure of Al2TiO5 / α-Al2O3 ceramic composite materials. Abnormal grains with longitudinal length ~10 μm23 transversal length ~1 μm and equiaxed matrix grains of ~3 μm on an average were observed. EDXA proved that the rod-like grains and the fine equiaxed matrix grains were composed of Al2TiO5 and α-Al2O3, separately. The roles of anisotropic grain growth caused by mechanical activation are discussed for the in situ formation of rod-like Al2TiO5 / α-Al2O3 ceramic composite materials.

scholarly journals ASME Code Rules and ASTM Standards Integration for Ceramic Composite Core Materials and Components1

2021 ◽  
Vol 2048 (1) ◽  
pp. 012020
Author(s):  
J W Geringer ◽  
Y Katoh ◽  
S Gonczy ◽  
T Burchell ◽  
M Mitchell ◽  
...  
Keyword(s):  
Composite Materials ◽  
Ceramic Composite ◽  
Ceramic Matrix Composites ◽  
Ceramic Composites ◽  
Test Methods ◽  
Code Design ◽  
Matrix Composites ◽  
Asme Code ◽  
Ceramic Composite Materials ◽  
American Society

Abstract Fiber-reinforced ceramic matrix composites have many desirable properties for high-temperature nuclear applications, including excellent thermal and mechanical properties and reasonable to outstanding radiation resistance. Over the last 20 years, the use of ceramic composite materials has already expanded in many commercial nonnuclear industries as fabrication and application technologies mature. The new ASME design and construction rules under Section III, Subsection HH, Subpart B lay out the requirements and criteria for materials, design, machining and installation, inspection, examination, testing, and the marking procedure for ceramic composite core components, which is similar to the established graphite code under Section III, Subsection HH, Subpart A. Moreover, the general requirements listed in Section III, Subsection HA, Subpart B are also expanded to include ceramic composite materials. The code rules rely heavily on the development and publication of standards for composite specification, classification, and testing of mechanical, thermal, and other properties. These test methods are developed in the American Society for Testing and Materials Committee C28 on Advanced Ceramics with a current focus on ceramic composite tubes. Details of the composites code, design methodology, and similarities to the graphite code, as well as guidance for the development of specifications for ceramic composites for nuclear application and recent standard developments, are discussed. The next step is to “close the gap” to support licensing aspects by validating the code with benchmarking data.

Life Prediction Based on Material State Changes in Ceramic Matrix Composite Materials

2007 ◽  
Author(s):  
Ken Reifsnider ◽  
S. W. Case
Keyword(s):  
High Temperature ◽  
Composite Materials ◽  
Gas Turbines ◽  
Ceramic Composite ◽  
Ceramic Matrix Composite ◽  
Ceramic Composites ◽  
Stress Strain ◽  
Material State ◽  
State Changes ◽  
Ceramic Composite Materials

Monolithic ceramics and continuous fiber reinforced ceramic composites are being developed for use in high temperature applications such as combustor liners in gas turbines, thrust deflectors for jet engines, and thruster nozzles. Ceramic composite materials possess the high temperature resistance properties of ceramics, but have better creep and cyclic properties. However, the properties of these materials change somewhat with time at service temperatures, i.e., their material state changes as a function of service conditions and history. The authors have developed a methodology for representing and combining the effects of high temperature material state changes in CMCs, along with changes in applied stress / strain conditions during service, to estimate remaining strength and life of ceramic composite materials and components. Fatigue, creep rupture, and time dependent deformation are combined by a strength metric in integral form to create a time-resolved, point-wise estimate of current remaining strength and life in material elements. Application of this methodology in discrete element representations of mechanical behavior of structural elements with nonuniform stress / strain states has been implemented.

scholarly journals Investigation of CeTi2O6- and CaZrTi2O7-containing glass–ceramic composite materials

2017 ◽  
Vol 95 (11) ◽  
pp. 1110-1121 ◽  
Author(s):  
Elham Paknahad ◽  
Andrew P. Grosvenor
Keyword(s):  
Composite Materials ◽  
Glass Ceramic ◽  
Local Structure ◽  
Glass Matrix ◽  
Ceramic Composite ◽  
Ceramic Composites ◽  
X Ray ◽  
Synthesis Conditions ◽  
Ceramic Composite Materials ◽  
Glass Ceramic Composite

Glass–ceramic composite materials are being investigated for numerous applications (i.e., textile, energy storage, nuclear waste immobilization applications, etc.) due to the chemical durability and flexibility of these materials. Borosilicate and Fe–Al–borosilicate glass–ceramic composites containing brannerite (CeTi2O6) or zirconolite (CaZrTi2O7) crystallites were synthesized at different annealing temperatures. The objective of this study was to understand the interaction of brannerite or zirconolite-type crystallites within the glass matrix and to investigate how the local structure of these composite materials changed with changing synthesis conditions. Powder X-ray diffraction (XRD) and Backscattered electron (BSE) microprobe images have been used to study how the ceramic crystallites dispersed in the glass matrix. X-ray absorption near edge spectroscopy (XANES) spectra were also collected from all glass–ceramic composite materials. Examination of Ti K-, Ce L3-, Zr K-, Si L2,3-, Fe K-, and Al L2,3-edge XANES spectra from the glass–ceramic composites have shown that the annealing temperature, glass composition, and the loading of the ceramic crystallites in the glass matrix can affect the local environment of the glass–ceramic composite materials. A comparison of the glass–ceramic composites containing brannerite or zirconolite crystallites has shown that similar changes in the long range and local structure of these composite materials occur when the synthesis conditions to form these materials or the composition are changed.

scholarly journals Rationally designed ultra-short pulsed laser patterning of zirconia-based ceramics tailored for the bone-implant interface

2020 ◽  
Author(s):  
Norbert Ackerl ◽  
Alexander Hansen Bork ◽  
Roland Hauert ◽  
Eike Müller ◽  
Markus Rottmar
Keyword(s):  
Surface Modification ◽  
Composite Materials ◽  
Material Properties ◽  
Ceramic Composite ◽  
Pulsed Laser ◽  
Ceramic Composites ◽  
Titanium Implants ◽  
Laser Machining ◽  
Laser Patterning ◽  
Ceramic Composite Materials

Ceramic composite materials are increasingly used in dental restoration procedures, but current ceramic surface designs do not yet achieve the osseointegration potential of state-of-the-art titanium implants. Rapid bone tissue integration of an implant is greatly dependent on its surface characteristics, but the material properties of ceramic composite materials interfere with classical surface modification techniques. Here, ultra-short pulsed laser machining, which offers a defined energy input mitigating a heat-affected zone, is explored for surface modification of ceramic composites. Inspired by surface textures of clinically relevant titanium implants, dual roughness surfaces are laser patterned. Raman mapping reveals a negligible effect of ultra-short pulsed laser ablation on material properties, but a laser-induced change in the wetting state is revealed by static contact angle measurements. Laser patterning of surfaces also influences blood coagulation, but not the attachment and spreading of osteoblastic cells. The presented laser machining approach thus allows the introduction of a rational surface design on ceramic composites, holding great promise for the manufacturing of ceramic implants.

scholarly journals A study of the electronic structure and structural stability of Gd2Ti2O7 based glass-ceramic composites

RSC Advances ◽  
2015 ◽  
Vol 5 (99) ◽  
pp. 80939-80949 ◽  
Author(s):  
Esther Rani Aluri ◽  
Andrew P. Grosvenor
Keyword(s):  
Electronic Structure ◽  
Composite Materials ◽  
Radioactive Waste ◽  
Structural Stability ◽  
Nuclear Waste ◽  
Glass Ceramic ◽  
Ceramic Composite ◽  
Ceramic Composites ◽  
Ceramic Composite Materials ◽  
Glass Ceramic Composite

Glass-ceramic composite materials have been investigated for nuclear waste sequestration applications due to their ability to incorporate large amounts of radioactive waste elements.

scholarly journals Investigation of Failure Mechanisms in Ceramic Composites as Potential Railway Brake Disc Materials

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5141
Author(s):  
Jeongguk Kim
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Ceramic Composite ◽  
Failure Mechanisms ◽  
Ceramic Matrix Composites ◽  
Tensile Tests ◽  
Ceramic Composites ◽  
Matrix Composites ◽  
Fracture Characteristics ◽  
Ceramic Composite Materials

Ceramic composite materials have been efficiently used for high-temperature structural applications with improved toughness by complementing the shortcomings of monolithic ceramics. In this study, the fracture characteristics and fracture mechanisms of ceramic composite materials were studied. The ceramic composite material used in this study is Nicalon ceramic fiber reinforced ceramic matrix composites. The tensile failure behavior of two types of ceramic composites with different microstructures, namely, plain-weave and cross-ply composites, was studied. Tensile tests were performed on two types of ceramic composite material specimens. Microstructure analysis using SEM was performed to find out the relationship between tensile fracture characteristics and microstructure. It was found that there was a difference in the fracture mechanism according to the characteristics of each microstructure. In this study, the results of tensile tests, failure modes, failure characteristics, and failure mechanisms were analyzed in detail for two fabric structures, namely, plain-weave and cross-ply structures, which are representative of ceramic matrix composites. In order to help understanding of the fracture process and mechanism, the fracture initiation, crack propagation, and fracture mechanism of each composite material are schematically expressed in a two-dimensional figure. Through these results, it is intended to provide useful information for the design of ceramic composite materials based on the mechanistic understanding of the fracture process of ceramic composite materials.

Design and development of ring-on-ring jig for biaxial strength testing of brittle ceramic composite materials: ZrB2-30wt-%SiB6

2019 ◽  
Vol 118 (4) ◽  
pp. 159-168 ◽  
Author(s):  
Alejandro Carrasco-Pena ◽  
Ryan Jordan ◽  
Jessica Dieguez ◽  
Arturo Coronado-Rodríguez ◽  
Veli B. Ozdemir ◽  
...  
Keyword(s):  
Composite Materials ◽  
Ceramic Composite ◽  
Strength Testing ◽  
Design And Development ◽  
Ceramic Composite Materials

scholarly journals Intermetallic/Ceramic Composites Synthesized from Al–Ni–Ti Combustion with B4C Addition

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 873
Author(s):  
Chun-Liang Yeh ◽  
Chih-Yao Ke
Keyword(s):  
Combustion Velocity ◽  
Ceramic Composites ◽  
The Other ◽  
X Ray Diffraction ◽  
Temperature Synthesis ◽  
Reaction Systems ◽  
X Ray ◽  
High Temperature Synthesis ◽  
In Situ Formation

The fabrication of intermetallic/ceramic composites by combustion synthesis in the mode of self-propagating high-temperature synthesis (SHS) was investigated in the Al–Ni–Ti system with the addition of B4C. Two reaction systems were employed: one was used to produce the composites of xNiAl–2TiB2–TiC with x = 2–7, and the other was used to synthesize yNi3Al–2TiB2–TiC with y = 2–7. The reaction mechanism of the Al–Ni–Ti system was strongly influenced by the presence of B4C. The reaction of B4C with Ti was highly exothermic, so the reaction temperature and combustion velocity decreased due to increasing levels of Ni and Al in the reactant mixture. The activation energies of Ea = 110.6 and 172.1 kJ/mol were obtained for the fabrication of NiAl- and Ni3Al-based composites, respectively, by the SHS reaction. The XRD (X-ray diffraction) analysis showed an in situ formation of intermetallic (NiAl and Ni3Al) and ceramic phases (TiB2 and TiC) and confirmed no reactions taking place between Ti and Al or Ni. The microstructure of the product revealed large NiAl and Ni3Al grains and small TiB2 and TiC particles. With the addition of TiB2 and TiC, the hardness of NiAl and Ni3Al was considerably increased and the toughness was also improved.

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