Porosity effect on the electrical conductivity of sintered powder compacts

2008 ◽  
Vol 92 (2) ◽  
pp. 375-380 ◽  
Author(s):  
J.M. Montes ◽  
F.G. Cuevas ◽  
J. Cintas
Keyword(s):  
Electrical Conductivity ◽  
Sintered Powder ◽  
Porosity Effect ◽  
Powder Compacts

Electrical conductivity of sintered powder compacts

2005 ◽  
Vol 48 (4) ◽  
pp. 343-344 ◽  
Author(s):  
J. M. Montes ◽  
F. G. Cuevas ◽  
J. A. Rodríguez ◽  
E. J. Herrera
Keyword(s):  
Electrical Conductivity ◽  
Sintered Powder ◽  
Powder Compacts

Electrical Properties of AlN-SiC Ceramics

2006 ◽  
Vol 317-318 ◽  
pp. 641-644
Author(s):  
Ryota Kobayashi ◽  
Junichi Tatami ◽  
Toru Wakihara ◽  
Takeshi Meguro ◽  
Katsutoshi Komeya
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Seebeck Coefficient ◽  
Gas Flow ◽  
Room Temperature ◽  
Xrd Analysis ◽  
Sic Ceramics ◽  
Sic Ceramic ◽  
Powder Compacts ◽  
Electrical Conductors

AlN-SiC ceramics with 0 to 75 mol% of AlN were fabricated through pressureless sintering of very fine AlN and SiC. Powder compacts with different amounts of AlN were fired at 2000°C for 1 h in Argon gas flow using an induction-heating furnace. The microstructure and phases present in the products were evaluated using SEM and XRD. The AlN-SiC ceramics had a porous structure with 30% porosity, and the grain size was increased with the addition of AlN. XRD analysis showed that 2H was a main phase in all samples, though 3C and 6H phases were found in 25 mol%AlN-75 mol%SiC ceramic. The electrical properties of the AlN-SiC ceramics were evaluated at various temperatures ranging from room temperature to 300°C. The electrical conductivity of the AlN-SiC ceramics depended on the amount of AlN and on the temperature. The 75 mol%AlN-SiC ceramic had higher electrical resistance, though the other samples were electrical conductors. The highest electrical conductivity was obtained with the 25 mol% AlN composition, which was 7 S/m at room temperature and 30 S/m at 300°C. The Seebeck coefficient for the AlN-SiC ceramics increased with rising temperatures. The AlN-SiC ceramics with 50 mol%AlN had the highest Seebeck coefficient of 220 2V/K at 300°C.

Thermal and electrical conductivities of sintered powder compacts

2003 ◽  
Vol 46 (3) ◽  
pp. 251-256 ◽  
Author(s):  
J. M. Montes ◽  
J. A. Rodríguez ◽  
E. J. Herrera
Keyword(s):  
Electrical Conductivities ◽  
Sintered Powder ◽  
Powder Compacts

Tensile Properties and Fracture Behaviour of Induction Sintered Ti and Ti-6Al-4V (wt %) Powder Compacts

2011 ◽  
Vol 275 ◽  
pp. 196-199 ◽  
Author(s):  
Stella Raynova ◽  
De Liang Zhang ◽  
D. Polo ◽  
L. Gonthier ◽  
W. Egea ◽  
...  
Keyword(s):  
Titanium Alloys ◽  
Tensile Properties ◽  
Metal Powder ◽  
Induction Heating ◽  
Diffusion Bonding ◽  
Powder Compact ◽  
Fracture Behaviour ◽  
Powder Consolidation ◽  
Sintered Powder ◽  
Powder Compacts

Induction heating of powder compacts could be a very effective method for metal powder consolidation to get the final product or as an intermediate consolidation step to produce feedstock for metal powder forging or extrusion. Our study has proven that only a few minutes of induction heating, of Ti and Ti-6Al-4V (wt %) powder compacts, increases their density dramatically and causes a significant sintering effect, as evidenced by the formation of interparticle diffusion bonding and reflected by the tensile properties of the induction sintered powder compacts. This paper presents and discusses the results of a study on the tensile properties and fracture behaviour of the Ti and Ti-6Al-4V powder compacts sintered under a variety of induction heating conditions. Keywords: Titanium alloys, powder consolidation, powder compact sintering, induction heating.

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