Abstract
The crystal characteristics of the diamond samples that are synthesized by several dynamic loading methods, i.e., explosion and impact, have been characterized by XRD and TEM and compared with the diamonds synthesized by static high-temperature and high-pressure method. The crystal lattice integrity of the diamonds synthesized by the dynamic loading methods is poor, and the diamonds possess the characteristic of polycrystalline coalescence. Similar to the static diamonds, the diamonds synthesized by the methods of plane shock wave and detonation products are also single cubic crystal, while the diamonds synthesized by the methods of axial symmetry shock wave and direct detonation have different proportions of cubic and hexagonal crystal structures. The reasons for the formation of these properties have been studied by analyzing the synthesis process and technical characteristics. The results are helpful for the reasonable application of these diamond products, and also have some significance in deepening the understanding of the synthesis mechanism of different dynamic loading methods.
Highlights
The dynamic loading method is the kind of method using explosion and impact to synthesize diamonds, in which formation thermodynamics, dynamic conditions, and characteristics of the product are similar to each other
It is called the dynamic pressure method, relative to the static high-temperature and high-pressure methods [1, 2]. It includes the plane shock wave method[3, 4], i.e., a flying plate driven by the explosive shocks to the graphite to synthesize diamonds; an axial symmetry shock wave method [5, 6] in which the explosive circumferential compress graphite and metal powder in the metal tube to synthesize the diamond; direct detonation method [7, 8, 9] of adding the graphite into high explosive and initiating explosive to synthesize the diamond; and the method of detonating products [10, 11, 12] in which the negative oxygen balance explosives directly detonate to synthesize the diamond
Flyer plate method The mechanism of the synthesis is that the flyer, which is driven by high speed and pressure shock waves produced by the explosive shocks the graphite target, and the graphite target immediately take on high temperature and pressure that caused by the kinetic energy of the high-speed flyer in the process
Summary
The dynamic loading method is the kind of method using explosion and impact to synthesize diamonds, in which formation thermodynamics, dynamic conditions, and characteristics of the product are similar to each other. Flyer plate method The mechanism of the synthesis is that the flyer, which is driven by high speed and pressure shock waves produced by the explosive shocks the graphite target, and the graphite target immediately take on high temperature and pressure that caused by the kinetic energy of the high-speed flyer in the process In this situation, the graphite crystal structure transforms into diamond. The sample characterized in this paper was obtained under the followed conditions: composition B size: ∅45mm×12mm, casted; carbon steel plate size: 45mm×45mm×3mm; graphite plate size: ∅40mm×8mm
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