Sympathetic Detonation Reaction Behavior of a Fuze Explosive Train

The general goal of this research is to clarify mechanisms of solid state reactions at the atomic level as a step in the rationalization of macroscopic reaction behavior in solids. A study of intermetallic alloy formation resulting from interdiffusion of metals in thin films can be made by HREM. In this work, reactions between Pt and Sn in thin films are studied to elucidate mechanisms for structural and compositional changes during the interdiffusion process.Thin films of Pt and Sn used in this study were prepared by the two-film method introduced by Shiojiri. Few hundred angstroms of Pt were vacuum-deposited onto holey carbon films mounted on TEM grids. Sn films with an average thickness of 200Å were created by evaporation at rates of 15-30 Å/sec onto air-cleaved KBr substrates. The Sn films were wet-stripped and collected on the holey Pt grids. Figure 1 shows a cross-section schematic of a Pt-Sn couple. While this two-film arrangement did not allow observations of the actual reaction interface, microtomy was used to produce cross-sections.

Download Full-text

REACTION BEHAVIOR OF C6H6 IN THE THREE-WAY CATALYTIC CONVERTER EQUIPPED A GASOLINE ENGINE

International Journal of Geomate ◽

10.21660/2014.12.3152 ◽

2014 ◽

Author(s):

Akio Takigawa

Keyword(s):

Gasoline Engine ◽

Catalytic Converter ◽

Reaction Behavior

Download Full-text

Carbothermic Reduction and Nitridation Mechanism of Vanadium-Bearing Titanomagnetite Concentrate

Minerals ◽

10.3390/min11070730 ◽

2021 ◽

Vol 11 (7) ◽

pp. 730

Author(s):

Wen Yu ◽

Xiaojin Wen ◽

Wei Liu ◽

Jiangan Chen

Keyword(s):

Phase Transformation ◽

Carbothermic Reduction ◽

Titanium Oxides ◽

Distribution Characteristic ◽

Reaction Behavior ◽

Microstructure Transformation ◽

Rate Limiting Step ◽

Limiting Step ◽

Roasting Process ◽

Rate Limiting

In this study, the carbothermic reduction and nitridation mechanism of vanadium-bearing titanomagnetite concentrate are investigated in terms of phase transformation, microstructure transformation, and thermodynamic analyses. The differences in the reaction behavior of titanomagnetite and ilmenite in vanadium-bearing titanomagnetite concentrate, as well as the distribution characteristic of V in the roasted products, are emphatically studied. It is observed that the reaction sequences of titanomagnetite and ilmenite transformations into nitride are as follows: Fe3−xTixO4→Fe2TiO4→FeTiO3→M3O5→(Ti, V)(N, C); FeTiO3→M3O5→Ti(N, C). The reduction of M3O5 to TiN is the rate-limiting step of the entire reaction, and metal iron is an important medium for transferring C for the reduction of M3O5. Titanomagnetite is faster to convert into nitride than ilmenite is, and the reasons for this are discussed in detail. During the entire roasting process, V mainly coexists with Ti and seems to facilitate the conversion of titanium oxides into (Ti, V)(N, C).

Download Full-text