US 12,024,666 B2
SiC-bound hard material particles, porous component formed with SiC-bound diamond particles, method of producing same and use thereof
Bjoern Matthey, Dredsen (DE); Steffen Kunze, Dresden (DE); and Mathias Herrmann, Dresden (DE)
Assigned to FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V., Munich (DE)
Appl. No. 16/980,570
Filed by Fraunhofer-Gesellschaft Zur Foederung Der Angewandten Forschung E.V., Munich (DE)
PCT Filed Mar. 14, 2019, PCT No. PCT/EP2019/056457
§ 371(c)(1), (2) Date Sep. 14, 2020,
PCT Pub. No. WO2019/175333, PCT Pub. Date Sep. 19, 2019.
Claims priority of application No. 10 2018 203 882.1 (DE), filed on Mar. 14, 2018.
Prior Publication US 2021/0002534 A1, Jan. 7, 2021
Int. Cl. C09K 3/14 (2006.01); C04B 35/52 (2006.01); C04B 35/573 (2006.01); C04B 35/626 (2006.01); C04B 35/628 (2006.01); C04B 35/65 (2006.01); C04B 38/06 (2006.01)
CPC C09K 3/1436 (2013.01) [C04B 35/52 (2013.01); C04B 35/573 (2013.01); C04B 35/62695 (2013.01); C04B 35/62839 (2013.01); C04B 35/65 (2013.01); C04B 38/067 (2013.01); C04B 2235/3826 (2013.01); C04B 2235/427 (2013.01); C04B 2235/428 (2013.01); C04B 2235/5436 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A process for producing SiC-bound hard diamond material particles wherein diamond particles are admixed with an organic binder and shaped into granules by a drying and granulation process;
subjecting the granules to a thermal treatment in an oxygen-free atmosphere, in which organic constituents are pyrolyzed and carbon is formed in situ from the organic binder in the course of pyrolysis and deposited in vitreous form on surfaces of the diamond particles;
performing a silicization during the thermal treatment or in a subsequent second thermal treatment with admixed pulverulent silicon and particulate spacers;
forming silicon carbide at the same time by chemical reaction with the carbon deposited on surfaces of diamond particles and/or with the diamond particles to form hard material particles,
wherein the diamond particles in the individual hard material particles are cohesively bonded to the SiC formed by reaction in the course of thermal treatment and the silicon so that the hard material particles are separated from one another at their surface by means of the added silicon and/or the particulate spacers, and wherein
hard material particles are hollow on the inside and produced by applying a suspension including diamond particles and an organic binder to silicon particles having a particle size in the range of 50 μm-150 μm or
by mixing in particles of a pulverulent organic substance that breaks down in the course of thermal treatment, the pulverulent organic substance being polymethylmethacrylate, polyurethane, polyurethane, polyethylene or polypropylene or starch and
subsequent pyrolysis treatment, the mixing with Si powder and the particulate spacer and reactive formation of SiC are effected, wherein the proportion of the added pulverulent silicon of 10%-200% by volume, of the content of diamond particles is added.