Synthesis of materials with multiscale porosity from fine powders of boron, titanium, aluminum and coarse granules of VT6 alloy

International Conference on Synthesis and Consolidation of Powder Materials

Ponomarev, M.A.^1 ; Loryan, V.E.^1

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka

142432, Russia^1

关键词: Chemical interactions;    Coarse particles;    Combustion mode;    Combustion pro-cess;    Combustion waves;    Different particle sizes;    Powder mixtures;    Self propagating high temperature synthesis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/558/1/012036/pdf
DOI  :  10.1088/1757-899X/558/1/012036

来源: IOP

【 摘 要 】

The material with different-scale porosity was prepared from powder mixtures with significantly different particle sizes of components by the method of self-propagating high-temperature synthesis in the combustion mode. Model mixtures were formed from coarse particles of VT6 alloy previously coated with a layer of aluminum, and fine-fraction powders of titanium and boron. Synthesis in such a system took place in stages - the fine components were the first to enter into chemical interaction in the combustion wave, with the formation of a porous boride framework. A strongly exothermic reaction between titanium and boron provided the entry of coarse particles of the VT6 alloy with aluminum coating into the reaction. The melt of reacting components and formed intermetallic compounds impregnated the porous boride matrix. The stages of the synthesis are reflected in the thermograms of the combustion process. The EDS, SEM, and XRD data of the obtained material are consistent with the observed stages of the process. Up to four different scales in pore size are distinguished in the synthesis product.