EP 3625192 A1 20200325 - METHOD FOR THE PRODUCTION OF PELLETS OF SINTERED MATERIAL, SUCH AS BORON CARBIDE PELLETS
Title (en)
METHOD FOR THE PRODUCTION OF PELLETS OF SINTERED MATERIAL, SUCH AS BORON CARBIDE PELLETS
Title (de)
VERFAHREN ZUR HERSTELLUNG VON PELLETS AUS SINTERMATERIAL, WIE ETWA BORCARBID-PELLETS
Title (fr)
PROCÉDÉ DE FABRICATION DE PASTILLES DE MATÉRIAU FRITTÉ, NOTAMMENT EN CARBURE DE BORE
Publication
Application
Priority
- FR 1756103 A 20170630
- FR 2018051591 W 20180628
Abstract (en)
[origin: WO2019002777A1] The invention relates to a method for the production of pellets of sintered material, comprising the following successive steps: a) forming calibrated pre-compacts by means of the first uniaxial pressing of portions, of equal mass, of the material in powder form, said first pressing process being carried out at a first threshold below the maximum green density threshold that can be achieved by the powder material; b) providing a pressing tool set comprising a die having a plurality of cavities and pressure pistons that are intended to slide in the cavities; c) placing pre-compacts in the cavities of the die, with first and second sintered boron nitride disks, having a thickness in the millimetre range and a density greater than or equal to 90%, being disposed, respectively, in each cavity at a first end and a second end of each pre-compact; d) forming calibrated compacts by means of the second uniaxial pressing of the pre-compacts, said second pressing process being carried out in the die using pressure pistons at a second threshold greater than the first threshold, which is less than or equal to the maximum green density that can be achieved by the powder material; e) forming sintered compacts by applying pressure and a pulsed current to the pressing tool set, such as to bring about a rapid rise in temperature according to a temperature-, pressure- and duration-controlled SPS sintering cycle; f) extracting the sintered compacts from the die.
IPC 8 full level
B22F 3/02 (2006.01); B22F 3/03 (2006.01); B22F 3/105 (2006.01); B28B 3/02 (2006.01); B28B 3/06 (2006.01); B30B 15/02 (2006.01); C04B 35/563 (2006.01); C04B 35/645 (2006.01)
CPC (source: EP US)
B28B 3/025 (2013.01 - EP US); B28B 3/06 (2013.01 - EP US); B28B 13/0205 (2013.01 - EP); C01B 32/991 (2017.07 - US); C04B 35/563 (2013.01 - EP); C04B 35/645 (2013.01 - EP); C04B 2235/604 (2013.01 - EP); C04B 2235/6562 (2013.01 - EP); C04B 2235/6567 (2013.01 - EP); C04B 2235/666 (2013.01 - EP); C04B 2235/77 (2013.01 - EP); C04B 2235/9623 (2013.01 - EP)
Citation (search report)
See references of WO 2019002777A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2019002777 A1 20190103; EP 3625192 A1 20200325; FR 3068272 A1 20190104; FR 3068272 B1 20190830; JP 2020525392 A 20200827; US 2020115236 A1 20200416
DOCDB simple family (application)
FR 2018051591 W 20180628; EP 18762346 A 20180628; FR 1756103 A 20170630; JP 2019572205 A 20180628; US 201816626808 A 20180628