Decomposition mechanism of AlMgB14 during the spark plasma sintering

Phase Composition, Structure and Properties of the Spark Plasma Sintered Ceramics Obtained from the Al12Mg17-B-Si Powder Mixtures

“…According to the results obtained on the light element analyzer LECO ONH, the amount of oxygen in the raw boron powder is 1.1 wt%, and in the intermetallic Al 12 Mg 17 powder does not exceed 0.1 wt%. Thus, the presence of oxygen in the structure is due to the contamination of the initial boron powder with boron oxide B 2 O 3 [ 17 , 18 ].…”

On the Structure and Properties of AlMgB14-TiB2 Composites Obtained from SHS Powders by Spark Plasma Sintering

“…As the literature analysis shows, the optimum sintering temperature for AlMgB 14 is 1400 °C [ 1 , 4 , 18 ]. In [ 8 ], the decomposition mechanism of AlMgB 14 in the SPS process at temperatures above 1400 °C was investigated. It was found that local overheating of the initial powder mixture leads to the decomposition of AlMgB 14 into Al 12 Mg 17 , AlB 12 , and Mg.…”

“…First of all, it is a combination of high hardness and low friction coefficient. Since that moment, scientists from different countries have been actively investigating AlMgB 14 materials and composite materials based on them: in particular, methods of fabricating bulk specimens [ 1 , 2 , 3 , 4 ], methods of obtaining coatings [ 5 , 6 ], formation [ 4 , 7 ] and decomposition [ 8 ] mechanisms, tribological characteristics of AlMgB 14 -based materials in dry conditions [ 7 , 9 , 10 ] and in various lubricants [ 11 , 12 ], and mechanical properties [ 1 , 2 , 3 , 4 , 7 , 8 ]. Over the past two decades, many methods have been reported for the production of AlMgB 14 -based materials, but these can be divided into two groups.…”

On the Tensile Strength of Spark Plasma Sintered AlMgB14 Ceramics

“…In combination with titanium diboride, materials based on AlMgB 14 demonstrate hardness reaching 46 GPa [ 2 ], which classifies AlMgB 14 –TiB 2 composite materials as superhard. As of yet, the main efforts of scientists have been directed at studying the influence of production methods (one-stage or two-stage sintering) and the composition of the initial mixture (ratio of initial elements, pre-reacted powders or mechanical mixture) on the structure, phase formation processes and properties of AlMgB 14 -based materials [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Today, it is traditionally considered that the best sintering methods for obtaining AlMgB 14 are spark plasma sintering and hot pressing of AlMgB 14 powder mixtures [ 2 , 14 , 15 , 16 , 17 , 21 , 22 , 23 ].…”

“…As of yet, the main efforts of scientists have been directed at studying the influence of production methods (one-stage or two-stage sintering) and the composition of the initial mixture (ratio of initial elements, pre-reacted powders or mechanical mixture) on the structure, phase formation processes and properties of AlMgB 14 -based materials [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Today, it is traditionally considered that the best sintering methods for obtaining AlMgB 14 are spark plasma sintering and hot pressing of AlMgB 14 powder mixtures [ 2 , 14 , 15 , 16 , 17 , 21 , 22 , 23 ]. At the same time, the properties of the obtained materials are mainly influenced by the purity of the material (the presence of MgAl 2 O 4 spinel in the samples leads to a significant decrease in the properties of AlMgB 14 [ 27 ]).…”