Processing and Performance of Continuous Fiber Ceramic Composites by Preceramic Polymer Pyrolysis: I - Filament Winding

2001 ◽  
Vol 35 (24) ◽  
pp. 2207-2237 ◽  
Author(s):  
Mehrdad N. Ghasemi Nejhad ◽  
Mahesh V. Ch And ◽  
Ali Yousefpour
Keyword(s):  
Ceramic Composites ◽  
Filament Winding ◽  
Preceramic Polymer ◽  
Continuous Fiber ◽  
Polymer Pyrolysis ◽  
And Performance

Development of Conductive Ceramic Composites by Preceramic Polymer

2007 ◽  
Vol 124-126 ◽  
pp. 331-334
Author(s):  
Beom Seob Kim ◽  
Deug Joong Kim
Keyword(s):  
Room Temperature ◽  
Ceramic Composites ◽  
Preceramic Polymer ◽  
Conductive Material ◽  
A Value ◽  
Preheat Treatment ◽  
N2 Atmosphere ◽  
Vacuum Atmosphere ◽  
Polymer Pyrolysis ◽  
Pyrolytic Product

The formation, microstructure and electrical property of conductive ceramic composites derived from polymer pyrolysis were investigated. Methylpolysiloxane was mixed with TiH2 as a filler and pyrolyzed in nitrogen, argon and vacuum atmosphere at a temperature of 1600oC for 1 hour after the preheat treatment at 850oC in N2 atmosphere. Depending on the atmosphere conditions, TiN and Ti5Si3 phases were formed by reaction of TiH2 as reactive filler and atmospheric gas or pyrolytic product such as SiO2. Consequently, the microstructures of the ceramic composites with 70 vol.%TiH2 pyrolyzed at 1600oC for 1 hour in vacuum were composed of TiN and Ti5Si3 particles. The density and electrical conductivity of the ceramic composites were 97.3 TD% and 6200 ohm-1⋅cm-1, respectively. These composites pyrolyzed by polymer were considered as superior conductive material with a value of 103 ~ 104 in log scale at room temperature.

scholarly journals Effect of Chemical Composition on Magnetic and Electrical Properties of Ferroelectromagnetic Ceramic Composites

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2488
Author(s):  
Dariusz Bochenek ◽  
Przemysław Niemiec ◽  
Artur Chrobak
Keyword(s):  
Magnetic Properties ◽  
Electrical Properties ◽  
Ferroelectric Properties ◽  
Ceramic Composites ◽  
Chemical Formula ◽  
Backscattered Electrons ◽  
Diffraction Patterns ◽  
And Performance ◽  
Composite Samples ◽  
Magnetic And Electrical Properties

In this paper, ferroelectric–ferrimagnetic ceramic composites based on multicomponent PZT-type (PbZr1-xTixO3-type) material and ferrite material with different percentages in composite compositions were obtained and studied. The ferroelectric component of the composite was a perovskite ceramic material with the chemical formula Pb0.97Bi0.02(Zr0.51Ti0.49)0.98(Nb2/3Mn1/3)0.02O3 (P), whereas the magnetic component was nickel-zinc ferrite with the chemical formula Ni0.5Zn0.5Fe2O4 (F). The process of sintering the composite compounds was carried out by the free sintering method. Six ferroelectric-ferrimagnetic ceramic P-F composite compounds were designed and obtained with different percentages of its components, i.e., 90/10 (P90-F10), 85/15 (P85-F15), 80/20 (P80-F20), 60/40 (P60-F40), 40/60 (P40-F60), and 20/80 (P20-F80). X-ray diffraction patterns, microstructural, ferroelectric, dielectric, magnetic properties, and DC electrical conductivity of the composite materials were investigated. In this study, two techniques were used to image the microstructure of P-F composite samples: SB (detection of the signals from the secondary and backscattered electron detectors) and BSE (detection of backscattered electrons), which allowed accurate visualization of the presence and distribution of the magnetic and ferroelectric component in the volume of the composite samples. The studies have shown that at room temperature, the ceramic composite samples exhibit good magnetic and electrical properties. The best set of physical properties and performance of composite compositions have ceramic samples with a dominant phase of ferroelectric component and a small amount of the ferrite component (P90-F10). Such a composition retains the high ferroelectric properties of the ferroelectric component in the composite while also acquiring magnetic properties. These properties can be prospectively used in new types of memory and electromagnetic converters.

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