Effect of initial composition on boron carbide production by SHS process followed by acid leaching

New route for preparing nanosized boron carbide powder via magnesiothermic reduction using mesoporous carbon

“…Derin et al studied the formation of B 4 C powder from different initial compositions using the SHS method and reported 22.6% yield for the reaction. [8] In spite of benefits such as inexpensive raw materials, low temperature synthesis conditions and the possibility of synthesis with simple setups, there are two main disadvantages in using this method, the low yield of B 4 C synthesis because of formation of magnesium oxide and magnesium borate as by-products during the synthesis process and the size and shape nonuniformity of the final products. Much research has been devoted to finding a proper solution to these problems.…”

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

“…Because these peaks accordance to Mg 3 B 2 O 6 , Mg 2 B 2 O 5 and Mg 2 SiO 4 compounds. Existence of Mg 2 B 2 O 5 and Mg 3 B 2 O 6 at boron oxide and magnesium systems has been approved by Alkan et al [18] and Nikzad et al [2]. Considering the existence of Si in the system, there is possibility for formation of Mg 2 SiO 4 .…”

“…Considering the existence of Si in the system, there is possibility for formation of Mg 2 SiO 4 . Mg 2 SiO 4 , according to the studies, is resistant to the acid leaching performed to remove the magnesium oxide and should not be leached significantly in this way but Mg 3 B 2 O 6 and Mg 2 B 2 O 5 can be eliminated after leaching [18,19]. So comparison between diffraction patterns of combustion products before and after acid leaching can identify the unknown compound.…”

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.…”

“…The chemical reaction of the mixture of B 2 O 3 and C reacted with Mg to produce B 4 C is shown in Eq. (1) [14]:…”