scholarly journals The Role of Sintering Additives on Synthesis of High Performance Ceramic- Matrix Composites (Cmcs) by Volume Combustion in The Tio2–Al–C System: Structural and Mechanical Properties

2019 ◽  
Vol 3 (2) ◽  
Keyword(s):  
High Performance ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Combustion Method ◽  
Lattice Parameter ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Sintering Additives ◽  
Structural Applications ◽  
Tic Particle

The purpose of this work is to decrease or eliminate porosities in ETE-VC products with sintering additives. The Ti–C system has been synthesized for its advantages for refractory, abrasive and structural applications. We attempted to density TiC by using iron addition; this metal is introduced through a secondary reaction 3TiO3 +Al. This mixture reacts exothermically ϪH298= -1072.7 kJ and the heat is released according to by Fe addition 3TiO3 +4Al+3C+xFe→3TiC+2Al2 O3 +xFe. X-ray diffraction analysis indicated that intermetallic Fe3 Al, TiC and Al2 O3 are the main phases formed in the reinforced high performance ceramic-matrix composites and the additions of Fe decreased the lattice parameter of TiC. Field emission scanning electron microscopy examinations showed that the addition of Fe decreased TiC particle size and changed their growth controlling mechanism. Also, Raman spectroscopy analysis showed that at higher Fe contents, oxygen dissolved in the TiC crystal structure leading to the formation of titanium oxy-carbide with lower lattice parameter and residual un-reacted carbon in the products. The adiabatic temperatures for the reactions containing % Fe estimated using the thermodynamic data. Thus, doping method is finally used to fabricate materials by ETE-VC method (volume combustion method) for industriel applications.

Study of Preforms of Quartzite for Production of Ceramic Matrix Composites

2008 ◽  
Vol 591-593 ◽  
pp. 430-435
Author(s):  
Adriana Scoton Antonio Chinelatto ◽  
R. Justus ◽  
Adilson Luiz Chinelatto ◽  
F.M.C.N. Nadal ◽  
E.A.T. Berg
Keyword(s):  
Squeeze Casting ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Flexure Strength ◽  
Pressure Infiltration ◽  
X Ray ◽  
Infiltration Technique ◽  
Sufficient Strength

The ceramic matrix composites (CMCs) can be fabricated by the pressure infiltration technique. In this work it was studied porous preforms of quartzite that were infiltrated with aluminum liquid. For to produce the more resistant preforms of quartzite, it was additioned different quantities of bentonite (5 and 10%) and the preforms were firing at 1100°C and 1200°C. For the composites production, the melted aluminum was introduced into preforms under a pressure of 7 MPa. The characterizations of the composites were made by X-ray diffraction, scanning electron microscopy, and flexure strength. All the preforms studied presented sufficient strength for support the pressing during the process of squeeze casting. The results of X-ray diffraction of composites showed the presence of alumina, silicon and aluminum and fully interpenetration aluminum-siliconalumina composites were obtained by infiltration.

Fabrication of TiAl/B4C Composites from an Al-Ti-B4C System Reinforced by TiC, TiB2 In Situ

2009 ◽  
Vol 79-82 ◽  
pp. 477-480 ◽  
Author(s):  
Li Hua Dong ◽  
Wei Ke Zhang ◽  
Jian Li ◽  
Yan Sheng Yin
Keyword(s):  
Bending Strength ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
High Energy ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hot Pressing Sintering ◽  
Different Content

Near full dense B4C ceramic matrix composites were fabricated from Ti-Al-B4C system by combining high energy milling with hot pressing sintering. The effect of different content of Ti-Al on the mechanical properties and microstructure of the as-prepared composites was investigated. A TiAl/B4C composite, whose typical bending strength and fracture toughness are 437.3 MPa and 4.85 MPa•m1/2, respectively, was made. The sintering mechanism and reinforcement mechanism were discussed with the assistant of X-Ray diffraction and electron microscopy.

scholarly journals Cyclic oxidation behaviour of ZrB2 -20 vol.%MoSi2 based ultra-high temperature ceramic matrix composite between 1100°C and 1300°C

2021 ◽  
Author(s):  
Mainak Saha
Keyword(s):  
High Temperature ◽  
Cyclic Oxidation ◽  
Ceramic Matrix Composite ◽  
Oxidation Kinetic ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Oxidation Behaviour ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Ultra High Temperature

While descending through different layers of atmosphere with tremendously high velocities, hypersonic re-entry nosecones fabricated using ultra-high temperature ceramic matrix composites (UHTCMCs) are subjected to repeated thermal shocks. This necessitates extensive investigations on the cyclic oxidation behaviour of UHTCMCs at temperatures ranging from 1100°C to 1300°C (service temperature of the nosecones). To this end, the present work is aimed at investigating the cyclic oxidation behaviour of ZrB2 -20 vol.%MoSi2 (ZM20) UHTCMC (a very widely investigated ZM CMC) by carrying out cycles for 6h, at 1cycle/h and estimating oxidation kinetic law. This has been followed by extensive characterisation using X-Ray Diffraction (XRD) to indicate the phases formed during oxidation and Scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), in order to determine the chemical composition of the oxides formed between 1100°C and 1300°C.

Analysis of Heat Generation during Fracture in Ceramic Matrix Composites

2008 ◽  
Vol 385-387 ◽  
pp. 689-692 ◽  
Author(s):  
Jeong Guk Kim
Keyword(s):  
High Temperature ◽  
Heat Generation ◽  
Damage Evolution ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
In Situ Monitoring ◽  
Potential Candidate ◽  
Matrix Composites ◽  
Ir Camera ◽  
Structural Applications

Ceramic matrix composites (CMCs) have evolved as potential candidate materials for high-temperature structural applications due to lightweight, high-temperature strength and excellent corrosion and wear resistance. In this investigation, damage evolution and heat generation of CMCs during monotonic loadings were investigated using different types of nondestructive evaluation (NDE) techniques, such as acoustic emission (AE) and infrared (IR) thermography and microstructural characterization. IR camera was used for in-situ monitoring of temperature evolution, and the temperature changes during testing were measured. A significant temperature increase has been observed at the time of failure. Microstructural characterizations using scanning electron microscopy (SEM) were performed to investigate fracture behavior of CMC samples. In this investigation, the NDE technique and SEM characterization were employed to analyze damage evolution and progress of ceramic matrix composites during monotonic loading.

Utilization of Foundry Waste to Produce Ceramic Matrix Composites

2016 ◽  
Vol 869 ◽  
pp. 149-154 ◽  
Author(s):  
A.L. Rodriguez ◽  
É.V. Queiroz ◽  
D.A.R. López ◽  
Tiago Bender Wermuth ◽  
T.M. Basegio ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Water Absorption ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Size Determination ◽  
X Ray Diffraction ◽  
Green Sand ◽  
X Ray ◽  
Particle Size Determination

The metallurgic industry, especially foundries, is a significant source of waste. For this reason, alternatives that involve reuse and recycling are necessary to minimize waste disposal in landfills and recover matter and energy. The feasibility of elaborating ceramic matrix composites with the incorporation of foundry waste was investigated in this study. Two types of residues were used to elaborate the composites. Green sand and grit blasting powder, in formulations with concentrations that ranged from 5.0 to 10.0% (m/m). The specimens were molded by uniaxial pressing, and a thermal treatment at 1000 °C was performed. The materials were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), particle size determination, linear retraction, water absorption, mechanical strength, leaching and solubilization. The results indicate that the incorporation of waste to the ceramic mass enables the processing of specimens with properties of industrial interest, such as mechanical strength and water absorption.

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