scholarly journals Electrospun alumina fibers doped with ferric and magnesium oxides

2018 ◽  
Vol 50 (1) ◽  
pp. 77-83 ◽  
Author(s):  
Predrag Milanovic ◽  
Marija Vuksanovic ◽  
Miodrag Mitric ◽  
Dusica Stojanovic ◽  
Aleksandar Kojovic ◽  
...  
Keyword(s):  
Mixed Oxides ◽  
Water Solution ◽  
Chemical Properties ◽  
Ceramic Matrix Composites ◽  
Aluminium Chloride ◽  
Matrix Composites ◽  
Sintering Process ◽  
Electrospinning Technique ◽  
Corundum Structure ◽  
Alumina Fibers

It is well known that alumina possesses good mechanical and chemical properties. Nanofibers having ? - alumina structure was used as reinforcement for metal, polymer and ceramic matrix composites. In this study, three series of nanofibers were prepared. The first series was made from 10 % water solution of the aluminium chloride hydroxide/polyvinyl alcohol with a mass ratio of 5:1. The other two series were made with the addition of 1 wt.% of MgCl2 or 1 wt.% of FeCl3 regarding the aluminium chloride hydroxide content. Nanofibers were prepared using the electrospinning technique and they were characterized by the TGA/DTA, XRD and FESEM methods. It was proven that addition of FeCl3 into the initial spinning solution lowers the temperature for the corundum structure formation while the addition of MgCl2 results if the formation of mixed oxides that eases the sintering process.

scholarly journals The effect of microstructural features on the mechanical properties of LZSA glass-ceramic matrix composites

Cerâmica ◽  
2013 ◽  
Vol 59 (351) ◽  
pp. 351-359 ◽  
Author(s):  
F. M. Bertan ◽  
A. P. Novaes de Oliveira ◽  
O. R. K. Montedo ◽  
D. Hotza ◽  
C. R. Rambo
Keyword(s):  
Glass Ceramic ◽  
Bending Strength ◽  
Chemical Properties ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Linear Shrinkage ◽  
Matrix Composites ◽  
Particulate Reinforced ◽  
And Chemical Properties

This work reports on the characterization of ZrSiO4 particulate-reinforced Li2O-ZrO2-SiO2-Al2O3 (LZSA) glass-ceramic matrix composites. The typical physical/mechanical and chemical properties of the glass batches and the composites were measured. A composition with 60 wt.% ZrSiO4 was preliminarily selected because it demonstrated the highest values of bending strength (190 MPa) and deep abrasion resistance (51 mm³). To this same composition was given a 7 wt.% bentonite addition in order to obtain plasticity behavior suitable for extrusion. The sintered samples (1150 ºC for 10 min) presented a thermal linear shrinkage of 14% and bending strength values of 220 MPa.

Influence of Compaction Pressure on Density, Bending Strength, and Microstructures of Al2O3-SiC-ZrO2 Ceramic Matrix Composites with Nb2O5 Additives

2018 ◽  
Vol 923 ◽  
pp. 61-65
Author(s):  
Dewi Lestari Natalia ◽  
Risly Wijanarko ◽  
Irene Angela ◽  
Bondan Tiara Sofyan
Keyword(s):  
Bending Strength ◽  
Compaction Pressure ◽  
Density Measurement ◽  
Ceramic Matrix Composites ◽  
High Hardness ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Sintering Process ◽  
Product Density ◽  
Microstructure Observation

Ceramic matrix composites (CMCs) are known to have high hardness, temperature and corrosion resistance, while being comparatively lightweight. One of many external factors that influence the mechanical properties of CMC is the compaction pressure given during fabrication process. Generally, greater amount of applied compaction pressure will result in improved final product density and bending strength. In this research, a type of CMCs was fabricated using Al2O3, SiC, and ZrO2 powder mixed with Nb2O5 additive of 81Al2O3-10SiC-5ZrO2-4Nb2O5 wt. % composition. Fabrication was done through mixing, compacting, and sintering process. Compaction was performed at 257, 308, and 359 MPa and finished with sintering process at 1400 °C for 4 h. Final samples were characterized by density measurement, 3-point bending strength testing, XRD for phase investigation, and microstructure observation using SEM-EDS. Results showing that samples with 308 MPa compaction pressure possessed the highest density and bending strength of 3.29 gr/cm3 and 14.91 MPa, respectively. These numbers however, declined on samples with higher compaction pressure of 359 MPa due to the formation of porosities caused by entrapped gas that failed to exit the sample of which compaction pressure was considered to be overwhelmingly high.

Preparation of Carbon Fiber Reinforced SiC Matrix Composites by PIP Process

2013 ◽  
Vol 683 ◽  
pp. 124-127 ◽  
Author(s):  
Quan Qing Zhang ◽  
Tao Zeng ◽  
Su Cheng
Keyword(s):  
Carbon Fiber ◽  
Reaction Zone ◽  
Conversion Rate ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Main Reaction ◽  
Matrix Composites ◽  
Sintering Process ◽  
Fiber Reinforced ◽  
Bonding Material

The precursor infiltration pyrolysis technology for preparation of ceramic matrix composites (CMCs) is both flexible and tailorable to shape and engineering requirements. During sintering process, PCS experienced an organic–inorganic transformation and acted as the bonding material between Carbon fiber. Compare to PCS, the ceramic conversion rate of PCS-DVB increased to 70-75%, the main reaction zone temprerature reduced to 400-800°C, which is in favor of protecting carbon fiber.

A TEM investigation of silicon nitride whiskers

1987 ◽  
Vol 45 ◽  
pp. 160-161
Author(s):  
Tapan Roy
Keyword(s):  
Silicon Nitride ◽  
High Resolution ◽  
Ceramic Matrix Composites ◽  
High Resolution Electron Microscopy ◽  
Molten Silicon ◽  
Matrix Composites ◽  
Ceramic Fibers ◽  
Resolution Electron ◽  
Point To Point ◽  
Technological University

Ceramic fibers are being used to improve the mechanical properties of metal matrix and ceramic matrix composites. This paper reports a study of the structural and other microstructural characteristics of silicon nitride whiskers using both conventional TEM and high resolution electron microscopy.The whiskers were grown by T. E. Scott of Michigan Technological University, by passing nitrogen over molten silicon in the presence of a catalyst. The whiskers were ultrasonically dispersed in chloroform and picked up on holey carbon grids. The diameter of some whiskers (<70nm) was small enough to allow direct observation without thinning. Conventional TEM was performed on a Philips EM400T while high resolution imaging was done on a JEOL 200CX microscope with a point to point resolution of 0.23nm.

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