Pressure Assisted WC-15%wt Co Sintering

2005 ◽  
Vol 498-499 ◽  
pp. 231-237
Author(s):  
M.F. Rodrigues ◽  
Guerold Sergueevitch Bobrovinitchii ◽  
Alan Monteiro Ramalho ◽  
Marcello Filgueira
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Liquid Phase ◽  
Structural Evolution ◽  
Liquid Phase Sintering ◽  
New Method ◽  
Powder Technology ◽  
High Pressure High Temperature

Hardmetal is usually processed by the conventional powder technology techniques: mix of WC + Co powders compacted and liquid phase sintering. A new method to process hardmetal parts is hereby described. Parts of WC-15%wt Co were processed by using high pressure – high temperature sintering. It was used the pressure of 5GPa, temperatures of 780-1200-1350-1400oC, and times of 2-4 minutes of sintering. Results are shown as a function of micro-structural evolution, densification, and hardness measurements.

Sinterability of High-Speed Steels M2, M3/2 and T15

2005 ◽  
Vol 498-499 ◽  
pp. 238-243 ◽  
Author(s):  
Romário Mauricio Urbanetto Nogueira ◽  
César Edil da Costa
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Liquid Phase ◽  
High Speed ◽  
Structural Evolution ◽  
Liquid Phase Sintering ◽  
New Method ◽  
Powder Technology ◽  
High Pressure High Temperature

Hardmetal is usually processed by the conventional powder technology techniques: mix of WC + Co powders compacted and liquid phase sintering. A new method to process hardmetal parts is hereby described. Parts of WC-15%wt Co were processed by using high pressure – high temperature sintering. It was used the pressure of 5GPa, temperatures of 780-1200-1350-1400oC, and times of 2-4 minutes of sintering. Results are shown as a function of micro-structural evolution, densification, and hardness measurements.

Pressure Aided Sintering of Ultrafine Powders of WC with Addition of Co

2008 ◽  
Vol 591-593 ◽  
pp. 308-313 ◽  
Author(s):  
L.H.F. Borges ◽  
H.C.P. Oliveira ◽  
R.S. Guimarães ◽  
T. Kobayashi ◽  
Marcello Filgueira
Keyword(s):  
Fracture Toughness ◽  
High Pressure ◽  
High Temperature ◽  
Liquid Phase ◽  
Vickers Hardness ◽  
Abrasion Resistance ◽  
High Hardness ◽  
Liquid Phase Sintering ◽  
Ultrafine Powders ◽  
Refractory Carbide

Hardmetal alloys are processed by liquid phase sintering, which consist of one refractory carbide, embebided in to a tough matrix of Co. These alloys extensively are used in applications that demand abrasion resistance and high hardness. The present work has as objective to analyze the sintering of ultrafine powders of tungsten carbide (WC) with the addition of 10%wtCo. The alloys had been prepared by using high pressure and high temperature technique. The sintering of the WC/10%pCo alloy was processed at the 3, 4 and 5 GPa, in temperatures of 1300,1400 and 1500°C, during 2 and 4 minutes. The analysis was made by microstructure, densification, structure, Vickers hardness and fracture toughness. The best results was density = 98.9%, hardness HV30 =10,77GPa and fracture toughness KIC = 15,57 MPa.m1/2.

scholarly journals Structural Evolution of CO2-Filled Pure Silica LTA Zeolite under High-Pressure High-Temperature Conditions

2017 ◽  
Vol 29 (10) ◽  
pp. 4502-4510 ◽  
Author(s):  
David Santamaría-Pérez ◽  
Tomas Marqueño ◽  
Simon MacLeod ◽  
Javier Ruiz-Fuertes ◽  
Dominik Daisenberger ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Structural Evolution ◽  
Temperature Conditions ◽  
Pure Silica ◽  
High Pressure High Temperature ◽  
Lta Zeolite

scholarly journals High-pressure synthesis and crystal structure of the mixed-cation borate Ga4In4B15O33(OH)3

2019 ◽  
Vol 74 (4) ◽  
pp. 357-363
Author(s):  
Daniela Vitzthum ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
High Temperature ◽  
Diffraction Data ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Mixed Cation ◽  
High Pressure High Temperature ◽  
Pressure Synthesis

AbstractThe mixed cation triel borate Ga4In4B15O33(OH)3 was synthesized in a Walker-type multianvil apparatus at high-pressure/high-temperature conditions of 12.5 GPa and 1300°C. Although the product could not be reproduced in further experiments, its crystal structure could be reliably determined via single-crystal X-ray diffraction data. Ga4In4B15O33(OH)3 crystallizes in the tetragonal space group I41/a (origin choice 2) with the lattice parameters a = 11.382(2), c = 15.244(2) Å, and V = 1974.9(4) Å3. The structure of the quaternary triel borate consists of a complex network of BO4 tetrahedra, edge-sharing InO6 octahedra in dinuclear units, and very dense edge-sharing GaO6 octahedra in tetranuclear units.

Iodine-mediated high-pressure high-temperature carbonization of hydrocarbons and synthesis of nanodiamonds

2021 ◽  
Vol 137 ◽  
pp. 111189
Author(s):  
E.A. Ekimov ◽  
K.M. Kondrina ◽  
I.P. Zibrov ◽  
S.G. Lyapin ◽  
M.V. Lovygin ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
High Pressure High Temperature

scholarly journals Multianvil High-Pressure/High-Temperature Synthesis and Characterization of multiferroic HP-Co3TeO6

2021 ◽  
Author(s):  
Gunter Heymann ◽  
Elisabeth Selb ◽  
Toni Buttlar ◽  
Oliver Janka ◽  
Martina Tribus ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Type Structure ◽  
Synthesis And Characterization ◽  
Temperature Synthesis ◽  
Space Group ◽  
Crystal System ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature

By high-pressure/high-temperature multianvil synthesis a new high-pressure (HP) phase of Co3TeO6 was obtained. The compound crystallizes in the acentric trigonal crystal system of the Ni3TeO6-type structure with space group R3...

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