Thermal and Electrical Conductivity of Porous Metals made by Powder Metallurgy Methods

1952 ◽  
Vol 65 (7) ◽  
pp. 502-511 ◽  
Author(s):  
P Grootenhuis ◽  
R W Powell ◽  
R P Tye
Keyword(s):  
Electrical Conductivity ◽  
Powder Metallurgy ◽  
Porous Metals ◽  
Powder Metallurgy Methods

scholarly journals Highly porous, hierarchically structured nickel nanomaterials consolidated by powder metallurgy methods

2021 ◽  
Vol 1942 (1) ◽  
pp. 012019
Author(s):  
A G Gnedovets ◽  
V A Zelensky ◽  
A B Ankudinov ◽  
V S Shustov ◽  
M I Alymov
Keyword(s):  
Powder Metallurgy ◽  
Powder Metallurgy Methods ◽  
Highly Porous

scholarly journals Hierarchically structured, highly porous nickel synthesized in sintering–evaporation process from a metal nanopowder and a space holder

2019 ◽  
Vol 484 (4) ◽  
pp. 436-440
Author(s):  
A. G. Gnedovets ◽  
V. A. Zelenskii ◽  
A. B. Ankudinov ◽  
M. I. Alymov
Keyword(s):  
Powder Metallurgy ◽  
Porous Material ◽  
Ammonium Bicarbonate ◽  
Evaporation Process ◽  
Porous Nickel ◽  
Space Holder ◽  
Nickel Nanopowder ◽  
Powder Metallurgy Methods ◽  
Highly Porous ◽  
Highly Porous Material

This paper reports on the creation of a highly porous material with a hierarchical structure using powder metallurgy methods based on nickel nanopowder and ammonium bicarbonate NH4HCO3 as a space holder.

TECHNOLOGICAL WAYS TO CREATE COMPOSITE MATERIALS BASED ON HEAT-RESISTANT REFRACTORY COMPOUNDS (review)

2021 ◽  
pp. 12-20
Author(s):  
A.V. Shestakov ◽  
◽  
M.M. Karashaev ◽  
N.S. Dmitriev ◽  
◽  
...  
Keyword(s):  
Composite Materials ◽  
Powder Metallurgy ◽  
Thermomechanical Processing ◽  
Technological Plasticity ◽  
Heat Resistant ◽  
System A ◽  
Refractory Compounds ◽  
Similar Materials ◽  
Powder Metallurgy Methods ◽  
Rocket Technology

The article discusses the main technological approaches to obtain heat-resistant and heat-resistant materials based on compounds in the Ni–Al system in order to use them in promising products of aviation and rocket technology. It is shown that when receiving materials based on compounds in the Ni-Al system, a phase of eutectic origin is formed based on the Ni3Al compound, which reduces the technological plasticity of the alloys of this system. The use of powder metallurgy methods eliminates such phases in the structure of alloys obtained using granule metallurgy technology, as well as with the use of special methods of powder metallurgy. Technological approaches are presented to obtain similar materials using powder metallurgy methods combined with thermomechanical processing.

The method of calculation of the deviation of the tool axis when machining small diameter holes

2020 ◽  
pp. 24-30
Author(s):  
A.V. Zaytsev ◽  
N. A. Kolupaev
Keyword(s):  
Powder Metallurgy ◽  
Negative Impact ◽  
Small Diameter ◽  
Hole Depth ◽  
Method Of Calculation ◽  
Tool Axis ◽  
Hole Axis ◽  
Hole Machining ◽  
Powder Metallurgy Methods ◽  
Cutting Modes

The article is devoted to an important parameter that characterizes the accuracy of the shape and location of the hole after machining — the displacement of the hole axis. When designing operations for drilling small-diameter holes with a large depth (the ratio of the hole depth to its diameter is more than 10), a method for predicting this parameter is necessary to improve the accuracy of work. The article considers the causes and methods of eliminating this negative impact on hole machining using the example of a small-diameter drill axis runout. Recommendations are given for reducing drill runout: to reduce cutting modes; to perform the drilling operation while rotating the workpiece, which can stabilize the drill position during machining; to use drills made of hard alloy or obtained by powder metallurgy methods, which increases their rigidity; before drilling the workpiece, to center the hole with a more rigid drill.

Effective parameters on the final properties of NiTi-based alloys manufactured by powder metallurgy methods: A review

2020 ◽  
pp. 100739 ◽  
Author(s):  
Soroush Parvizi ◽  
Seyed Mahdi Hashemi ◽  
Fatemeh Asgarinia ◽  
Mohammadreza Nematollahi ◽  
Mohammad Elahinia
Keyword(s):  
Powder Metallurgy ◽  
Effective Parameters ◽  
Powder Metallurgy Methods

Characterization and Properties of Iron/Silica-Sand-Nanoparticle Composites

2011 ◽  
Vol 316-317 ◽  
pp. 97-106 ◽  
Author(s):  
Tahir Ahmad ◽  
Othman Mamat
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Powder Metallurgy ◽  
Metal Matrix ◽  
Silica Sand ◽  
Particulate Composites ◽  
Powder Metallurgy Technique ◽  
Superior Mechanical Properties ◽  
Iron Based ◽  
Nanoparticle Composites

Metal matrix-particulate composites fabricated by using powder metallurgy possess a higher dislocation density, a small sub-grain size and limited segregation of particles, which, when combined, result in superior mechanical properties. The present study aims to develop iron based silica sand nanoparticles composites with improved mechanical properties. An iron based silica sand nanoparticles composite with 5, 10, 15 and 20 wt.% of nanoparticles silica sand were developed through powder metallurgy technique. It was observed that by addition of silica sand nanoparticles with 20 wt.% increased the hardness up to 95HRB and tensile strength up to 690MPa. Sintered densities and electrical conductivity of the composites were improved with an optimum value of 15 wt.% silica sand nanoparticles. Proposed mechanism is due to diffusion of silica sand nanoparticles into porous sites of the composites.

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