Binder and Polymer Assisted Powder Processing

2020 ◽  
Author(s):  
Randall M. German ◽  
Animesh Bose
Keyword(s):  
Powder Processing

Crystallization of MgO • Al2 • SiO2 • ZrO2 glasses

1986 ◽  
Vol 44 ◽  
pp. 440-441
Author(s):  
M. A. McCoy
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Powder Processing ◽  
Glass Composition ◽  
Ceramic Powder ◽  
Transformation Toughening ◽  
Ceramic Powder Processing ◽  
Processing Techniques ◽  
Ceramic Matrices

Transformation toughening by ZrO2 inclusions in various ceramic matrices has led to improved mechanical properties in these materials. Although the processing of these materials usually involves standard ceramic powder processing techniques, an alternate method of producing ZrO2 particles involves the devtrification of a ZrO2-containing glass. In this study the effects of glass composition (ZrO2 concentration) and heat treatment on the morphology of the crystallization products in a MgO•Al2•SiO2•ZrO2 glass was investigated.

scholarly journals Mechanosynthesis and Thermoelectric Properties of Fe, Zn, and Cd-Doped P-Type Tetrahedrite: Cu12-xMxSb4S13

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3448
Author(s):  
Francisco Arturo López Cota ◽  
José Alonso Díaz-Guillén ◽  
Oscar Juan Dura ◽  
Marco Antonio López de la Torre ◽  
Joelis Rodríguez-Hernández ◽  
...  
Keyword(s):  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Powder Processing ◽  
High Energy ◽  
Secondary Phases ◽  
Ambient Conditions ◽  
Cadmium Sulfate ◽  
Electrical Conductivities ◽  
Compositional Changes ◽  
P Type

This contribution deals with the mechanochemical synthesis, characterization, and thermoelectric properties of tetrahedrite-based materials, Cu12-xMxSb4S13 (M = Fe2+, Zn2+, Cd2+; x = 0, 1.5, 2). High-energy mechanical milling allows obtaining pristine and substituted tetrahedrites, after short milling under ambient conditions, of stoichiometric mixtures of the corresponding commercially available binary sulfides, i.e., Cu2S, CuS, Sb2S3, and MS (M = Fe2+, Zn2+, Cd2+). All the target materials but those containing Cd were obtained as single-phase products; some admixture of a hydrated cadmium sulfate was also identified by XRD as a by-product when synthesizing Cu10Cd2Sb4S13. The as-obtained products were thermally stable when firing in argon up to a temperature of 350–400 °C. Overall, the substitution of Cu(II) by Fe(II), Zn(II), or Cd(II) reduces tetrahedrites’ thermal and electrical conductivities but increases the Seebeck coefficient. Unfortunately, the values of the thermoelectric figure of merit obtained in this study are in general lower than those found in the literature for similar samples obtained by other powder processing methods; slight compositional changes, undetected secondary phases, and/or deficient sintering might account for some of these discrepancies.

Design of Joint Properties by Friction Powder Processing

2010 ◽  
Vol 638-642 ◽  
pp. 2058-2063 ◽  
Author(s):  
Koji Inada ◽  
Hidetoshi Fujii ◽  
Young Su Ji ◽  
Yoshiaki Morisada ◽  
Kiyoshi Nogi
Keyword(s):  
Friction Stir Welding ◽  
Powder Processing ◽  
Friction Stir ◽  
Probe Diameter ◽  
Shoulder Diameter ◽  
Joint Properties ◽  
First Pass ◽  
Al Powder ◽  
Pure Cu ◽  
Grain Diameter

Friction powder processing (FPP) has been developed based on the principle of friction stir welding (FSW) or friction stir processing (FSP). The FPP is a method to design the properties of the processed area by performing FSP after powder with a controlled composition is placed in the gap between two plates. The FPP experiments were performed using a tool with the shoulder diameter of 15mm and the probe diameter of 6mm. The tool traveled at 100mm/min and rotated at 1500rpm. A1050 aluminum was used as the plate. Pure Al powder (89μm average grain diameter) and pure Cu powder (106μm average grain diameter) were used as the additives. When using pure Al powder, the pure Al powder left in the base metal after the first pass is sufficiently stirred by performing the second pass and then a good joint without defects is obtained. However, more than three passes are not effective for improving the strength of the welded area. When using pure Cu powder, nanoscale Al2Cu precipitates are uniformly formed in the stir zone, and accordingly, the hardness is significantly increased.

Powder processing of ceramic matrix composites

1991 ◽  
Vol 144 (1-2) ◽  
pp. 143-152 ◽  
Author(s):  
F.F. Lange ◽  
D.C.C. Lam ◽  
O. Sudre ◽  
B.D. Flinn ◽  
C. Folsom ◽  
...  
Keyword(s):  
Powder Processing ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites

Extended defects in crystals: examples in powder processing for ancient cosmetics

2007 ◽  
Vol 89 (4) ◽  
pp. 865-869 ◽  
Author(s):  
J. Castaing ◽  
P. Walter ◽  
P. Veyssière
Keyword(s):  
Powder Processing ◽  
Defects In Crystals ◽  
Extended Defects

Waste Tire Free Shear Breaking and Design of Hydraulic System

2011 ◽  
Vol 422 ◽  
pp. 497-500 ◽  
Author(s):  
Li Jun Qiu ◽  
Jia Yang
Keyword(s):  
Powder Processing ◽  
Block Size ◽  
Effective Control ◽  
Waste Tire ◽  
Shear Process ◽  
Stress Changes ◽  
Drive Belt ◽  
Operation And Management ◽  
Block Volume ◽  
Rubber Block

In the development of waste tire rubber powder processing, reasonable integral tyre cutting into several parts. Direct shearing tear into pieces the tire shear into a few cm irregular rubber block, on a steel belt layer and colloid separation. The free state of tires in the shear process of the rubber block with larger volume, the volume of the rubber block into the next procedure shear stress changes caused by large, beyond the motor power or drive belt slipping phenomenon, to mechanical operation and management inconvenience. The effective control from the tire shear rubber block size and volume can reduce the powder production process in electric power consumption. For the free shear tyre is difficult to guarantee the initial shear rubber block volume, used to control the cutting width can be achieved for the tire shear rubber block control.

Equal Channel Angular Pressing of Carbon Nanotube Reinforced Metal Matrix Nanocomposites

2006 ◽  
Vol 326-328 ◽  
pp. 325-328 ◽  
Author(s):  
Quang Pham ◽  
Young Gi Jeong ◽  
Soon Hyung Hong ◽  
Hyoung Seop Kim
Keyword(s):  
Equal Channel Angular Pressing ◽  
Metal Matrix ◽  
Powder Processing ◽  
Full Density ◽  
Metal Matrix Nanocomposites ◽  
Powder Consolidation ◽  
Angular Pressing ◽  
Particle Bonding ◽  
Bottle Neck ◽  
Matrix Nanocomposites

In this study, powder processing and severe plastic deformation (SPD) approaches were combined in order to achieve both full density and good particle-matrix bonding in CNT and Cu powder mixtures without grain growth, which was considered as a bottle neck of the bottom-up method in the conventional powder metallurgy of compaction and sintering. Equal channel angular pressing (ECAP), one of the most promising methods in SPD, was used for the powder consolidation. The powder ECAP processing with 1, 2, 4 and 8 passes was conducted at room temperature. It was found by microhardness tests and microstructure characterization that relatively high mechanical strength could be effectively achieved as a result of the well bonded powder contact surface during powder ECAP. The SPD processing of powders is a viable method to achieve both fully density and good particle bonding in CNT-metal matrix nanocomposites.

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