In Situ Synthesis of TiB2-TiCx Ceramic Matrix Composites by Hot Isostatic Pressing

2007 ◽  
Vol 26-28 ◽  
pp. 251-254
Author(s):  
De Gui Zhu ◽  
Hong Liang Sun ◽  
Liang Hui Wang
Keyword(s):  
Raw Materials ◽  
Hot Isostatic Pressing ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Xrd Analysis ◽  
In Situ Synthesis ◽  
Matrix Composites ◽  
Isostatic Pressing ◽  
Fine Grain

TiB2-TiC ceramic matrix composites were fabricated by in situ synthesis under hot isostatic pressing (HIP) with 3TiH2-B4C and 11TiH2-3B4C being the raw materials, respectively. The XRD analysis indicates that the samples synthesized from 3TiH2-B4C have TiB2 and TiC phases, while those from 11TiH2-3B4C have not only TiB2 and TiCx phases, but also Ti3B4 phase. TiB2-TiCx ceramic matrix composites obtained from 11TiH2-3B4C have better mechanical properties than those from 3TiH2-B4C. The microstructures of the composites are investigated with SEM and TEM. TiB2 grains are platelet grains; Ti3B4 grains have two different morphologies. Ti3B4 phases are formed through two different paths: fine grain Ti3B4 is formed through TiB+B=Ti3B4 at low temperature; large plate-like grain Ti3B4 is formed through TiB2+TiB=Ti3B4 at high temperature.

Modeling of the Transition Layer in Ceramic Matrix Composites from Coal Wastes and Clay

2020 ◽  
Vol 299 ◽  
pp. 37-42
Author(s):  
O.A. Fomina ◽  
Andrey Yu. Stolboushkin
Keyword(s):  
Transition Layer ◽  
Raw Materials ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Coal Waste ◽  
Matrix Composites ◽  
Carbonaceous Particles ◽  
The Core ◽  
Coal Wastes

A model of the transition layer between the shell and the core of a ceramic matrix composite from coal waste and clay has been developed. The chemical, granulometric and mineral compositions of the beneficiation of carbonaceous mudstones and clay were studied. The technological and ceramic properties of raw materials for the samples manufacturing were determined. The method of manufacturing multilayer ceramic samples from coal waste, clay and their mixture is given. The number of transition layers in the contact zone between the clay shell and the core from coal wastes is determined. The deformation and swelling phenomena of model samples from coal wastes, clay, and their mixtures were revealed at the firing temperature of more than 1000 °C. The formation of a reducing ambient in the center of the sample with insufficient air flow is shown. The influence of the carbonaceous particles amount and the ferrous form iron oxide in the coal wastes on the processes of expansion of multilayer samples during firing has been established.

Carbon nanotubes for the synthesis of ceramicmatrix composite (cleaning, dispersion, surface modification) (Review)

2019 ◽  
pp. 30-39
Author(s):  
A. V. Belyakov
Keyword(s):  
Carbon Nanotubes ◽  
Surface Modification ◽  
Industrial Production ◽  
Raw Materials ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Dispersion Surface ◽  
The Cost

In connection with the continuing decrease in the cost of carbon nanotubes (CNT) and the promising properties of ceramic-matrix composites (CMC) reinforced with CNTs, their wide application in industry is on the agenda. It is necessary to create cheap technologies for the production of CNTs to do this. The review of the technological stages of the industrial production of complex-shaped products from KMK reinforced CNTs is given: the cleaning of raw materials after their production, the dispersion of aggregates and some methods for modifying their surface. Ref. 93. Tab. 3.

Fabrication of a ZrC–SiC matrix for ceramic matrix composites via in-situ reaction and its application

2013 ◽  
Vol 39 (1) ◽  
pp. 877-881 ◽  
Author(s):  
Qinggang Li ◽  
Shaoming Dong ◽  
Zhen Wang ◽  
Jianbao Hu ◽  
Bin Wu ◽  
...  
Keyword(s):  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
In Situ Reaction

CNTs/Si3N4 Composites Fabricated by Reaction Bonded Processing

2007 ◽  
Vol 336-338 ◽  
pp. 1277-1279
Author(s):  
Zhi Yong Huang ◽  
Xue Jian Liu ◽  
Xing Wei Sun ◽  
Li Ping Huang
Keyword(s):  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Xrd Analysis ◽  
Matrix Composites ◽  
Si3n4 Ceramic ◽  
Average Value ◽  
Microwave Attenuation ◽  
X Band ◽  
Sem Micrograph ◽  
Transmission Attenuation

The CNTs/Si3N4 ceramic matrix composites were prepared by the reaction bonded processing. The phase compositions, chemical compatibility, mechanical properties, and microwave attenuation properties of the composites were investigated. XRD analysis shows the composites consist mainly of the α- and β-Si3N4, with a trace of unreacted silicon. The SEM micrograph displays the fractured surface of the composites studs with intact CNTs, indicating that CNTs and Si3N4 are chemically compatible. The composites with 1.0wt.% CNTs have a strength of 280 MPa, hardness of 8.2 GPa and toughness of 2.3 MPa·m0.5. The average value of the transmission attenuation reaches 6 dB at X band, indicating the composites have a potential for application in electromagnetic adsorbing or shielding.

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