Abstract

The invention relates to a deformable rigid structure, preferably for using in the simulation of situations such as uneven, collapsed or deformed structures, with the possibility of reviewing and modifying said situations as desired, where the structure comprises a plurality of nodes, connection ends and coupling systems, the node having at least two flat faces to which the coupling system is connected, the coupling system, in turn, being connected to a connection end comprising a structural element that has ends on which a spherical element is arranged so that the structural element is connected to the node in a pivoting manner.

IPC Classes  ?

• E04B 1/19 - Three-dimensional framework structures
• E04B 1/32 - Arched structuresVaulted structuresFolded structures
• E04B 1/343 - Structures characterised by movable, separable, or collapsible parts, e.g. for transport
• E04B 1/344 - Structures characterised by movable, separable, or collapsible parts, e.g. for transport with hinged parts

Abstract

The invention relates to a method of obtaining silicon carbide from rice hulls, which comprises the following steps: (a) adding a catalyst and a precipitating agent to the hulls and drying the latter until the degree of moisture is between 0 % and 5 %; (b) pyrolysing the hulls to which the catalyst and precipitating agent have been added, in an inert atmosphere until ashes are obtained; (c) reducing the size of the ashes; and (d) mechanically separating the silicon carbide from the ashes. The invention also relates to two apparatus: a tilting furnace for performing method step (b), and a cyclone for performing method step (d).

IPC Classes  ?

• C01B 31/36 - Carbides of silicon or boron
• F27B 7/12 - Rotary-drum furnaces, i.e. horizontal or slightly inclined tiltable
• B04C 5/00 - Apparatus in which the axial direction of the vortex is reversed

Abstract

The invention relates to a method for producing metal matrix composite materials comprising ceramic particles. The method comprises the following steps: obtaining semi-solid melt of the metal material having between 0.3 and 0.6 solid fractions in relation to the volume of the melt, first obtaining the melt in a liquid state, then in a semi-solid state; mixing the melt; adding metal-coated ceramic particles; casting the melt; and forging the cast material. The composite material obtained using said method has a metal matrix with a globular structure. It is also possible to produce metal materials with a globular structure using all of the steps of the method except the particle addition step. In addition, the invention relates to a machine for carrying out the steps of the method according to the invention.

IPC Classes  ?

• B22D 27/04 - Influencing the temperature of the metal, e.g. by heating or cooling the mould
• B22D 27/08 - Shaking, vibrating, or turning of moulds
• B22D 27/09 - Treating the metal in the mould while it is molten or ductile by using pressure
• B22D 17/00 - Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
• B22D 21/00 - Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedureSelection of compositions therefor
• B22D 23/02 - Top casting