Electrical Wire Explosion of Cr-Coated Ti Wire in N<SUB>2</SUB> Gas

Abstract

Cr-coated Ti wire was electrically exploded in N 2 gas. The diameter of Ti wire was 0.289 mm and the thickness of Cr coating was 0.033 mm, which corresponds to the average composition of about 25 at% Cr. X-ray diffraction and FE-TEM study revealed that the explosion products consisted of cube-shaped TiN, sphere-shaped Cr 2 N, and clusters of extremely fine particles. The average particle size of TiN and Cr 2 N was about 35 and 38 nanometers, respectively. The size of the fine particles was small as a few nanometers and clustered heavily. Therefore, it was not possible to examine individually. The particles contained about 28 at% Cr. In some part of the high resolution TEM image, cubic structure could be recognized. The lattice parameter of the particles calculated assuming cubic structure was smaller than TiN and larger than CrN. As a result, it was concluded that the fine particles are (Ti,Cr)N.

Preparation of Titanium-Chromium Nitride by Gas Nitriding of the Explosion Products of Cr-Coated Ti Wire

“…Figure 5 presents the TEM micrographs of reaction product before and after nitriding. The explosion product consists of cube-shaped TiN, spherical Cr 2 N, and fine particles that are presumed to be (Ti,Cr)N. 12) The fine particles were not observed after nitriding (Fig. 5(b)).…”

“…We have obtained the explosion products, the mixture of TiN, Cr 2 N and the clusters of very fine grains by exploding the Cr-coated Ti wire in N 2 gas. 12) This mixture was heated at 1100 C in vacuum or under flowing nitrogen gas. Figure 3(a) shows the X-ray diffraction pattern of the as-exploded mixture consisting of mainly binary nitrides, that is, TiN and Cr 2 N. It is evident that Cr 2 N phase decomposed into metallic Cr and nitrogen gas by heat treatment in vacuum (Fig.…”

“…10) Later on, we produced the mixture of TiN, Cr 2 N, and a few nanometer-sized fine particles, which are presumably (Ti,Cr)N, by exploding a Cr-coated Ti wire in nitrogen. 12) In this study, we aimed to synthesize (Ti,Cr)N nanoparticles from two different explosion products obtained in our previous work of Refs. 10) and 12).…”

Rapid Consolidation of TiN&ndash;Cr₂N&ndash;(Ti,Cr)N Nanoparticles Using Pulsed Current Activated Sintering and the Mechanical Properties of Sintered Product

“…More detailed description of the phases are provided in Ref. 17). Obviously, simple comparison of the peak intensity appears to suggest that the major phase is TiN together with small amount of Cr 2 N phase.…”

“…The particles consisted of the cube-shaped TiN, sphere-shaped Cr 2 N, and clusters of extremely fine (Ti,Cr)N particles. 17) Figure 2 shows the diffraction pattern of the reaction product on which TiN and Cr 2 N peaks are marked by and , respectively. Ti or Cr peaks are not observed.…”