Compaction of semi-solid aluminium-silicon powder mixtures

1997 ◽  
Vol 53 (7-8) ◽  
pp. 39
Author(s):  
T Marooka
Keyword(s):  
Silicon Powder ◽  
Powder Mixtures ◽  
Semi Solid

The Effect of Si3N4Addition on Nitriding and Post-Sintering Behavior of Silicon Powder Mixtures

2012 ◽  
Vol 49 (4) ◽  
pp. 363-368 ◽  
Author(s):  
Young-Jo Park ◽  
Jae-Woong Ko ◽  
Jae-Wook Lee ◽  
Hai-Doo Kim
Keyword(s):  
Silicon Powder ◽  
Sintering Behavior ◽  
Powder Mixtures

EFFECT OF PARTICLE MORPHOLOGY ON CRITICAL CONDITIONS FOR SHOCK-INITIATED REACTIONS IN TITANIUM-SILICON POWDER MIXTURES

2009 ◽  
Author(s):  
David L. Frost ◽  
François-Xavier Jetté ◽  
Samuel Goroshin ◽  
Andrew J. Higgins ◽  
Julian J. Lee ◽  
...  
Keyword(s):  
Particle Morphology ◽  
Silicon Powder ◽  
Critical Conditions ◽  
Powder Mixtures ◽  
Titanium Silicon

scholarly journals Impact of the Morphology of Micro- and Nanosized Powder Mixtures on the Microstructure of Mg-Mg2Si-CNT Composite Sinters

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3242 ◽  
Author(s):  
Anita Olszówka-Myalska ◽  
Patryk Wrześniowski ◽  
Hanna Myalska ◽  
Marcin Godzierz ◽  
Dariusz Kuc
Keyword(s):  
Powder Mixture ◽  
Silicon Powder ◽  
X Ray Diffraction ◽  
Mechanical Mixing ◽  
Carbon Phase ◽  
Nanosized Powders ◽  
Powder Mixtures ◽  
Mg2si Phase ◽  
Quantitative Image ◽  
Lower Porosity

The problem of preparing a ternary powder mixture, which was meant to fabricate sintered heterophase composite, and consisted of micro- and two nanosized powders, was analyzed. The microsized powder was a pure magnesium, and as nanocomponents, a silicon powder (nSi) and carbon nanotubes (CNTs) with 2% and 1% volume fractions, respectively, were applied. The powder mixtures were prepared using ultrasonic and mechanical mixing in technological fluid, and four mixing variants were applied. The morphology of the powder mixtures was characterized with scanning electron microscopy (SEM), and then, composite sinters were fabricated in a vacuum with hot temperature pressing at 580 °C under 15 MPa pressure, using a Degussa press. The reaction between the nSi and the Mg matrix, which caused the creation of the Mg2Si phase in the fabricated Mg-Mg2Si-CNT composite, was confirmed with X-ray diffraction (XRD). The porosity and hardness of the composite sinters were examined, and optical microscopy (OM) and quantitative image analyses were carried out to characterize the microstructure of the composites. In the manufacturing process of the Mg-nSi-CNT mixtures, the best results were the following: first separate de-agglomeration of nanocomponents, then their common mixing, and finally, the deposition of nanocomponents at the surface of the microsized magnesium powder. The applied procedure ensured the uniform layer formation of de-agglomerated nanocomponents on the Mg powder, without re-agglomerated nSi and CNTs. Moreover, this type of powder mixture morphology allows to obtain sinters with lower porosity and higher hardness, which is accompanied by precipitation of a finer Mg2Si phase. In the Mg-Mg2Si-CNT composite, the carbon phase was present, and it was located in the magnesium matrix and in silicide.

Sign in / Sign up

Export Citation Format

Share Document