<i>In Situ</i> Synthesis of B₄C / TiB₂ Composites from Low Cost Sugar Based Precursor

Abstract

In the present study, a method based on sulfuric acid dehydration of sugar was developed to synthesis a precursor material, which can yield B4C/ TiB2 composites at much lower temperatures compared to traditional carbothermal methods. The precursor material for pure B4C and B4C / TiB2 composites were heat treated at 1650oC under Ar and Ar+H2 atmosphere. Then the samples were characterized by X-ray diffraction (XRD) and crystallized B4C and B4C / TiB2 composites can be obtained at 1650oC

Recycling of Hazelnut Shell: Synthesis of Boron Carbide by Carbothermic Reaction

“…In the FTIR, spectra of boron carbide samples (figure 3) indicated the B -C bond formation during the main heating process. The peak at 1190 cm -1 was labeled as the B -C absorption band, while the peak at 1412 cm -1 was attributed to the B -O stretching vibration [11,13,14]. The shifting B -O stretching vibration to 1372 cm -1 (Figure 3a) could be originated boron icosahedra [11].…”

“…The peak at 1190 cm -1 was labeled as the B -C absorption band, while the peak at 1412 cm -1 was attributed to the B -O stretching vibration [11,13,14]. The shifting B -O stretching vibration to 1372 cm -1 (Figure 3a) could be originated boron icosahedra [11]. Figure 4 shows the XRD patterns of hazelnut shell activated carbon.…”

“…However, the XRD pattern of products indicated the presence of graphite and boron oxide, too. According to the studies [10,11], the boron oxide and graphite were always observed below 1600 °C when organic precursors were used. It was observed that the usage of hazelnut activated carbon provided better results than sulfuric-acidtreated activated carbon in the XRD pattern.…”

“…The carbothermic process includes cheaper raw materials, for example, boron oxide and boric acid which is reduced by carbon to give boron carbide [5,6]. There are several studies for the usage of different types of carbon sources, such as citric acid gel [6][7][8][9], sucrose [10][11][12][13] and organic polymer precursor [14,15].…”

Sol‐gel assisted synthesis of TiB2‐B4C composite powder

“…For example, TiB 2 ‐B 4 C composite was synthesized with an appropriate purity with sub‐micron particle size (<500 nm) by mechanically and chemically activated combustion method 11 . Also, Cakir et al 13 prepared this composite with the reaction between boric acid, sugar, and C 8 H 20 O 4 Ti (titanium ethanolite) at temperature of 1650⁰C. Baharvandi et al 12 synthesized B 4 C‐Nano TiB 2 composite powder by the sol‐gel method.…”