The shock wave compaction of ceramic powders

Abstract

Joint theoretical and experimental investigations have allowed to realize an approach with use of mathematical and physical modeling of processes of a shock wave compaction of ceramic powders. The aim of this study was to obtain a durable low-porosity compact sample. The explosive compaction technology is used in this problem because ceramic powders such as boron carbide and aluminum oxide is an extremely hard and refractory material. Therefore, its compaction by traditional methods requires special equipment and considerable expenses. In order to better understand the influence of the loading conditions and, in particular, to study the effect of detonation velocity, explosive thickness and explosion pressure on the properties of the final sample, the problem of compaction of the powder in an axisymmetric case using the conditions of the above experiments have been numerically solved. Thus, using the technology of explosive compaction, compact samples of boron carbide and aluminum oxide are obtained. On the basis of experimental and numerical studies of shock waves propagation, the optimum scheme and parameters of dynamic compaction of boron carbide and aluminum oxide are determined in order to maximize the density and the conservation of the samples after dynamic loading.

Performance Comparison of Advanced Ceramic Cladding Approaches via Solid-State and Traditional Welding Processes: A Review

“…In explosion cladding, the sudden increase in temperature and pressure resulted in the intense fracturing of original grains present before the cladding process. They caused the development of much finer grains post cladding leading to denser coatings [ 77 , 80 , 97 , 98 ]. Cracks and micropores were familiar in the microstructures due to the intense shock wave and the ceramics’ brittle nature [ 74 , 79 ].…”

Molecular-dynamic Investigation of Silicon Carbide Fracture Under External Mechanical Loads

“…The main advantage of the molecular dynamics (MD) method when modeling processes at the microlevel is that MD does not require the use of additional models, as is done in the mechanics of a deformed solid [11][12][13][14]. Thus, the proposed approach is based on Newton's law (or Hamilton's theory), while the thermodynamic and physical properties of materials are determined by the interatomic interaction potential.…”

Molecular-dynamic investigation of the influence of initial temperature on the character of shock-wave processes in silicon carbide nanocluster

“…Experimental studies of these processes are complicated by the scale of phenomena, both in time and in space [2,4]. Thus, it is urgent to conduct numerical experiments, in particular, molecular dynamics modelling [5,6].…”