Theory of metal particle ignition I. Ignition of metal particles in the formation of solid solutions

1979 ◽  
Vol 15 (3) ◽  
pp. 299-304 ◽  
Author(s):  
A. B. Arutyunyan ◽  
S. L. Kharatyan ◽  
A. G. Merzhanov
Keyword(s):  
Solid Solutions ◽  
Metal Particle ◽  
Metal Particles ◽  
Particle Ignition

Electron Microscopy of the Shape of Small Metal Particles

1977 ◽  
Vol 35 ◽  
pp. 300-301
Author(s):  
M. Jose Yacaman
Keyword(s):  
Electron Microscopy ◽  
Metal Particle ◽  
Field Experiments ◽  
Size Range ◽  
Dark Field ◽  
Metal Particles ◽  
Bragg Condition ◽  
Crystal Particle ◽  
Small Metal Particle ◽  
Small Metal Particles

In the Study of small metal particles the shape is a very Important parameter. Using electron microscopy Ino and Owaga(l) have studied the shape of twinned particles of gold. In that work electron diffraction and contrast (dark field) experiments were used to produce models of a crystal particle. In this work we report a method which can give direct information about the shape of an small metal particle in the amstrong- size range with high resolution. The diffraction pattern of a sample containing small metal particles contains in general several systematic and non- systematic reflections and a two-beam condition can not be used in practice. However a N-beam condition produces a reduced extinction distance. On the other hand if a beam is out of the bragg condition the effective extinction distance is even more reduced.

scholarly journals Microfluidic Airborne Metal Particle Sensor Using Oil Microcirculation for Real-Time and Continuous Monitoring of Metal Particle Emission

Micromachines ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 825
Author(s):  
Jong-Seo Yoon ◽  
Jiwon Park ◽  
Hye-Rin Ahn ◽  
Seong-Jae Yoo ◽  
Yong-Jun Kim
Keyword(s):  
Real Time ◽  
Metal Particle ◽  
Continuous Monitoring ◽  
Metal Particles ◽  
Minimum Size ◽  
Capacitive Sensing ◽  
Test Bed ◽  
Optimal Frequency ◽  
Site Monitoring ◽  
Cost Efficient

Airborne metal particles (MPs; particle size > 10 μm) in workplaces result in a loss in production yield if not detected in time. The demand for compact and cost-efficient MP sensors to monitor airborne MP generation is increasing. However, contemporary instruments and laboratory-grade sensors exhibit certain limitations in real-time and on-site monitoring of airborne MPs. This paper presents a microfluidic MP detection chip to address these limitations. By combining the proposed system with microcirculation-based particle-to-liquid collection and a capacitive sensing method, the continuous detection of airborne MPs can be achieved. A few microfabrication processes were realized, resulting in a compact system, which can be easily replaced after contamination with a low-priced microfluidic chip. In our experiments, the frequency-dependent capacitive changes were characterized using MP (aluminum) samples (sizes ranging from 10 μm to 40 μm). Performance evaluation of the proposed system under test-bed conditions indicated that it is capable of real-time and continuous monitoring of airborne MPs (minimum size 10 μm) under an optimal frequency, with superior sensitivity and responsivity. Therefore, the proposed system can be used as an on-site MP sensor for unexpected airborne MP generation in precise manufacturing facilities where metal sources are used.

Thermal Theory of Metal Particle Ignition

AIAA Journal ◽  
1975 ◽  
Vol 13 (2) ◽  
pp. 209-214 ◽  
Author(s):  
A.G. MERZHANOV
Keyword(s):  
Metal Particle ◽  
Thermal Theory ◽  
Particle Ignition

Two types of metal particle in the Bachmut (L6) chondritic meteorite

1986 ◽  
Vol 50 (356) ◽  
pp. 317-322
Author(s):  
V. P. Semenenko ◽  
L. G. Samoilovich ◽  
B. V. Tertichnaya
Keyword(s):  
Chemical Composition ◽  
Thermal History ◽  
Metal Particle ◽  
Metal Particles ◽  
Cu Content

AbstractMetal particles in the Bachmut chondrite may be subdivided into large (hundreds of μm in size) and small (1–10 µm in size) varieties. They differ in the ratio of their constituent phases, in structure, and in chemical composition. Large particles are richer in Ni than small ones, the latter being characterized by an abnormally high Cu content. It is suggested that different pre-accretion histories were responsible for producing the various types of metal grains, and that, during post-accretion thermal history, temperatures were too low to cause elemental redistribution among the grains.

scholarly journals The Microhardness as an Express Method for Estimation the Depth of Metal Particle Distribution

2016 ◽  
Vol 6 (1) ◽  
pp. 37
Author(s):  
L.L. Muhina ◽  
I.V. Razumovskaja ◽  
S.K. Kudaikulova ◽  
B.A. Zhubanov ◽  
M.J.M. Abadie
Keyword(s):  
Metal Particle ◽  
Particle Distribution ◽  
Polymeric Materials ◽  
Microhardness Measurement ◽  
Metal Particles ◽  
Silver Layer ◽  
Express Method ◽  
Polyimide Films

By measurement of microhardness of silver layer on polyimide films and its reduction after removing the stress, the depth of silver distribution in the polyimide films was calculated. A significant hardening of Kapton 100 HN films was observed especially for cobalt-impregnated materials, which was about 10 μm. The distribution of silver in the film layers was obviously deeper that manifested as entirely lower hardening at microhardness measurement. Because of the initial microhardness of Upilex it was observed strong hardening of the effort, which was led to shallow distribution of metals in the films. For example, Cometallized films showed 5 μm distribution in the top film layers. Such method could allow precisely and rapidly estimating the distribution of metal particles impregnated in metallized polymeric materials.

scholarly journals Optimum Disposition of Metal Particles in the Propellant Grain

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Leonid L. Minkov ◽  
Ernst R. Shrager ◽  
Elizaveta V. Pikushchak
Keyword(s):  
Metal Particle ◽  
Specific Impulse ◽  
Combustion Products ◽  
Combustion Efficiency ◽  
Metal Particles ◽  
Phase Flow ◽  
Solid Propellants ◽  
Two Phase ◽  
Cross Sectional ◽  
Metal Combustion

Using the dispersed metal in solid propellants to increase the temperature of combustion products leads to such a problem as the specific impulse loss due to the incomplete combustion of metal particles in the exhaust products. A redistribution of metal loaded into the propellant grain is one of the methods to decrease the specific impulse loss. This paper reports on the ways to obtain the optimum metal particle disposition for the case-bounded propellant grain of tube cross-sectional type. Three different approaches to analyze the metal combustion efficiency are discussed. The influence of the dynamic nonequilibrium of two-phase flow on the optimum metal particles disposition in the propellant grain of tube cross-sectional type is investigated.

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