Abstract
In this work; the effects of an aluminum nitride (AlN) ceramic coating on the thermal conductivity of carbon fiber-reinforced composites were studied. AlN were synthesized by a wet-thermal treatment (WTT) method in the presence of copper catalysts. The WTT method was carried out in a horizontal tube furnace at above 1500 °C under an ammonia (NH3) gas atmosphere balanced by a nitrogen using aluminum chloride as a precursor. Copper catalysts pre-doped enhance the interfacial bonding of the AlN with the carbon fiber surfaces. They also help to introduce AlN bonds by interrupting aluminum oxide (Al2O3) formation in combination with oxygen. Scanning electron microscopy (SEM); Transmission electron microscopy (TEM); and X-ray diffraction (XRD) were used to analyze the carbon fiber surfaces and structures at each step (copper-coating step and AlN formation step). In conclusion; we have demonstrated a synthesis route for preparing an AlN coating on the carbon fiber surfaces in the presence of a metallic catalyst.
Highlights
Thermal management has always been a major concern in the design of high frequency and power electronic devices
In order to avoid the malfunction of electronic devices, composites materials used in these devices should have high thermal conductivity and electrical insulator properties
In order to improve the thermal conductivity of composites, various inorganic ceramic fillers with high thermal conductivity have been introduced into insulation composites; notable example include silicon nitride (SiN) [6,7,8], silicon carbide (SiC) [9], boron nitride (BN) [10,11], alumina oxide (Al2 O3 ) [12,13,14], and alumina nitride (AlN) [15,16,17]
Summary
Thermal management has always been a major concern in the design of high frequency and power electronic devices. Among the various ceramic fillers, aluminum nitride is an important ceramic material that has attracted considerable attention due to its excellent thermal conductivity (82–170 W/mK) and electrical resistance (>1014 Ω·cm @ R.T.), as well as its high density, wide band gap, low dielectric constant, and low thermal expansion coefficient close to that of silicon [18,19,20,21,22,23,24,25,26,27,28] It has good chemical stability and high hardness and is used in various structure refractory composite applications. Among the methods for synthesizing AlN, direct nitridation of aluminum powder is attractive because of the low cost of the raw materials and the simple nitridation setup This method is not suitable as an AlN synthesis method for inducing high thermal conductivity when used as a filler of a composite material. The preparation and thermal properties of AlN synthesized by WTT method were analyzed according to the synthesis temperature and the use of catalyst
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