scholarly journals Effect of additional heat-treatment temperature on chemical, microstructural, mechanical, and electrical properties of commercial PAN-based carbon fibers

2011 ◽  
Vol 12 (4) ◽  
pp. 223-228 ◽  
Author(s):  
Dong-Hwan Cho ◽  
Sung-Bong Yoon ◽  
Chae-Wook Cho ◽  
Jong-Kyoo Park
Keyword(s):  
Heat Treatment ◽  
Electrical Properties ◽  
Carbon Fibers ◽  
Heat Treatment Temperature ◽  
Treatment Temperature ◽  
Additional Heat ◽  
Additional Heat Treatment ◽  
Mechanical And Electrical Properties

scholarly journals Effect of Processing Parameters on the Thermal and Electrical Properties of Electroless Nickel-Phosphorus Plated Carbon Fiber Heating Elements

2020 ◽  
Vol 6 (1) ◽  
pp. 6
Author(s):  
Bo-Kyung Choi ◽  
Soo-Jin Park ◽  
Min-Kang Seo
Keyword(s):  
Heat Treatment ◽  
Electrical Properties ◽  
Heat Treatment Temperature ◽  
Treatment Time ◽  
Volume Resistivity ◽  
Treatment Temperature ◽  
Heat Treatment Time ◽  
Plating Bath ◽  
Infrared Thermal Imaging ◽  
Thermal And Electrical Properties

Carbon fibers (CFs) were plated with nickel-phosphorus (Ni-P) using an electroless plating process. The effects of the process parameters such as heat treatment temperature, heat treatment time, and the pH of the plating bath on electroless Ni-P plating were investigated. The structure, elemental composition, and thermal and electrical properties of Ni-P plated CFs (MCF) were characterized by X-ray diffraction (XRD), a four-probe volume resistivity tester, and an infrared thermal imaging camera, respectively. The XRD indicated the presence of amorphous and crystalline phases of Ni and Ni-P. The MCF were able to perform at high temperatures because of their higher thermal conductivity. A heat treatment temperature of 300 °C, a heat treatment time of 4 h, and a pH of 8.5 were found to be optimum for obtaining MCF with desirable thermal and electrical properties.

Effect of NaNbO3 Crystalline Aggregates on the Electrical Properties of SiO2-Na2O-Nb2O5 Glass-Ceramics

2006 ◽  
Vol 514-516 ◽  
pp. 274-279 ◽  
Author(s):  
Manuel P.F. Graça ◽  
Maria Gracinda Ferreira da Silva ◽  
Manuel A. Valente
Keyword(s):  
Heat Treatment ◽  
Electrical Properties ◽  
Heat Treatment Temperature ◽  
Glass Ceramics ◽  
Treatment Temperature ◽  
Treated Sample ◽  
Dc And Ac Conductivity ◽  
Potential Applications ◽  
Quenching Method ◽  
Crystalline Aggregates

The presence of NaNbO3 crystallites in a glass matrix has scientific and technological interest due to their electrical properties and potential applications in microwave, pyroelectric and piezoelectric devices. A glass with the composition 60SiO2-30Na2O-10Nb2O5 (% mole) was prepared by the melt-quenching method. NaNbO3 microcrystallites were precipitated on the surface of the glass by heat-treatment. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, dc and ac conductivity measurements were used in the study of the glass and glassceramic materials. The number of particles, precipitated in the surface of the glass-ceramic samples, increases from the 650 to the 750°C and decrease in the 800°C sample. In all these samples the particles size thickness increases with the rise of the heat-treatment temperature. In the 750 and 800°C samples it was observed the presence of a white surface layer formed by NaNbO3 crystallites aggregations. The dc conductivity (σdc) decreases with the rise of the heat –treatment temperature up to 750°C and the dielectric constant value, at 1kHz and room temperature, has a maximum value of 34.94 for the 800 °C treated sample.

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