Effect of milling on the combustion synthesis of ternary system B2O3, Mg and C

Phase and morphology studies of B4C–SiC nanocomposite powder synthesized by MASHS method in B2O3, Mg, C and Si system

“…Raw materials including graphite (99.5% purity and particle size $50 lm), silicon (>99% purity and particle size $150 lm) and Mg powders (99% >purity and particle size <100 lm) and 37% HCl (ffi99% purity) manufactured by Merck and B 2 O 3 powder (>99% purity and particle size <50 lm) manufactured by SDFCL Co. As a result of evaporation of Mg during combustion reaction, Mg in excess of the stoichiometric quantity was needed, so Mg/B 2 O 3 molar ratio increased from 6/2 to 7/2 [2]. Raw materials were weighed according to Eqs.…”

“…Raw materials were weighed according to Eqs. (1) and (2) to prepare the synthesis materials of B 4 C-SiC composite and B 4 C. Weighed materials were milled by Retsch PM100 ball mill with 250 ml steel cup under argon atmosphere, according to Table 1. By uniaxial cold press, tablet shape samples with 10 mm diameter and 5 mm height were prepared from each form of milled powders.…”

“…Due to the combination of its remarkable hardness, high melting temperature ($2743 K), low density (2.52 g cm À3 ), wear resistance, chemical stability, neutron absorption capability, etc., boron carbide is a very attractive material in several industrial fields, particularly in cutting tools, nuclear industry, military tools and thermoelectric application [1][2][3]. Also, Silicon carbide due to characteristics such as high temperature stability (<3000 K), low density (3.21 g cm À3 ), chemical stability, high hardness and high corrosion resistance is interesting compound in several industrial fields such as abrasive and cutting tools, electronic devices, heating elements and nuclear industry [4][5][6].…”

“…Acid leaching has been done to remove impurities. In many researches, acid leaching has been used by HCl at different concentrations and times to remove MgO and other undesirable products [1,2,8,15]. B 4 C-SiC composite has been prepared in several methods.…”

A three-step synthesis process of submicron boron carbide powders using microwave energy

“…Recently, some authors reported that B 4 C ceramic powder could be formed via magnesiothermic reduction process using boron sources such as B, B 2 O 3 , H 3 BO 3 , and Na 2 B 4 O 7 , as well as Mg and carbon sources such as petroleum coke, graphite, and activated carbon [7][8][9][10][11][12][13][14][15][16]. Magnesiothermic reduction process could be formed using mechanochemical synthesis using a ball milling or self-propagation high-temperature synthesis (SHS) process.…”