Whirlpool S.a.

Universidade Federal De Santa Catarina (ufsc)

Universidade Federal De Santa Catarina

Embraco-industria De Compressores E Solucoes Em Refrigeracao, Ltda.

Lupatech S.a.

Roberto Binder

Aloisio Nelmo Klein

Cristiano Binder

Gisele Hammes

Moises Luiz Parucker

Waldyr Ristow Junior

Valderes Drago

Martin Seifert

Fernando Withers Torres

Gunter Siegfried Motz

Rodrigo Pereira Becker

Renan Oss Giacomelli

Paulo Henrique Mareze

Irene Cristina Magnabosco Mocellin

Pedro Henrique Teshima Shioga

Cristian Bernardi

Andre Messias Teixeira

Kaline Pagnan Furlan

Jose Daniel Biasoli De Mello

Gustavo Tontini

Nilda Martins

Arcanjo Lenzi

Euclides Alexandre Bernardelli

Renan Muller Schroeder

Thiago De Souza Lamim

Christiano Binder

Moisés Luiz Parucker

The present invention lies in the fields of chemistry and materials engineering. More specifically, the present invention describes a process of heat treatment of polymeric precursors including as active phases particle charge or a mixture of active phases with inert phases called 'fillers'. It is also described a surface including ceramic polymer obtained by said process. The volumetric positive variation resulting from the formation of new phases, which for their formation, incorporate atoms from the gaseous phase, contributes to a minor shrinkage of the composition during the heat treatment process. The process of the present invention allows obtaining the desired phases in smaller treatment times and lower temperatures, when compared to a thermal treatment process as conventional pyrolysis (PC) due to the presence of highly reactive species, as for example atomic nitrogen produced by the dissociation of nitrogen molecules in the plasma environment.

Plasma-assisted process of ceramization of polymer precursor on surface, surface comprising ceramic polymer

The present invention describes a process for coating conductive component in a plasma reactor and a conductive component coating, wherein the process includes the steps of cleaning, mechanical support deposition, topographic modification by plasma bombardment, chemical support layer deposition and amorphous carbon layer deposition (Diamond-Like Carbon). In one embodiment, the process is in single cycle. The present invention pertains to the fields of Materials Engineering, Physics and Chemistry.

Process for coating a conductive component and conductive component coating

The metallurgical composition comprises a main particulate metallic material, for example iron or nickel, and at least one alloy element for hardening the main metallic material, which form a structural matrix; a particulate solid lubricant, such as graphite, hexagonal boron nitride or mixture thereof; and a particulate alloy element which is capable of forming, during the sintering of the composition conformed by compaction or by injection molding, a liquid phase, agglomerating the solid lubricant in discrete particles. The composition may comprise an alloy component to stabilize the alpha-iron matrix phase, during the sintering, in order to prevent the graphite solid lubricant from being solubilized in the iron. The invention further refers to the process for obtaining a self-lubricating sintered product.

Composition of particulate materials and process for obtaining self-lubricating sintered products

A process for the synthesis of nanostructured metallic hollow spherical particles, in which the metal is deposited onto sacrificial masks formed in a polymeric colloidal solution by the electroless autocatalytic deposition method. Deposition releases only gaseous products (Nand H) during the oxidation thereof, which evolve without leaving contaminants in the deposit. The particulate material includes nanostructured metallic hollow spherical particles with average diameter ranging from 100 nm to 5 &#x3bc;m and low density with respect to the massic metal. A process for compacting and sintering a green test specimen are also described.

Process for the synthesis of nanostructured metallic hollow particles and nanostructured metallic hollow particles

The process comprises the steps of: mixing a load of oxide ceramic material particles () with a load of space holder particles (), defined by graphite and/or amorphous carbon; compacting the mixture formed by ceramic material particles () and space holder particles (), to form a compact body (E); and sintering said compact body (E), so that the ceramic material particles () form sintering contacts with each other, whereas the carbon of the space holder particles () is removed by the reaction with the oxygen in the sintering medium, to form open secondary pores (II), by eliminating the space holder particles (). The metallurgic composition comprises the mixture of the ceramic material particles () with the space holder particles ().

Process for manufacturing a porous body by powder metallurgy and metallurgic composition of particulate materials

The plasma reactor comprises a reaction chamber () connectable to a source of ionizable gases () and to a heating device (), said reactor () being subjected to the phases of heating (A), cleaning (L) and/or surface treatment (S), cooling (R), unloading (D) and loading (C) of metallic pieces (). The installation comprises: at least two reactors (), each being selectively and alternately connected to: the same source of ionizable gases (); the same vacuum source (); the same electrical energy source (); and to the same heating device (), the latter being displaceable between operative positions, in each of which surrounding laterally and superiorly a respective reactor (), while the latter is in its heating phase (A) and cleaning phase (L) and/or in the surface treatment phase (S) of the metallic pieces ().

Installation and process for the treatment of metallic pieces by a plasma reactor

The process basically comprises: dissolving a lamellar disulphide, as a source of the solid lubricant, in an aqueous solvent, forming a first aqueous solution; dissolving a reducing agent, as hydroxylamine, sodium hypophosphite or sodium borohydride, in an aqueous solvent, forming a second aqueous solution; mixing the first and second aqueous solutions, forming a third aqueous solution; neutralizing the pH of the third aqueous solution; dissolving a sulphur source, in an aqueous solvent, forming a fourth aqueous solution; mixing the third and fourth aqueous solutions, forming a fifth aqueous solution, which is contained and heated in an autoclave; cooling the fifth aqueous solution to the room temperature; and removing, from the autoclave, the nanoparticles in powder form.

Process for production of nanoparticles of solid lubricant and lubricant dispersions stable in oil and in water

The metallurgical composition includes a main particulate metallic material, for example iron or nickel, and at least one alloy element for hardening the main metallic material, which form a structural matrix; a particulate solid lubricant, such as graphite, hexagonal boron nitride or mixture thereof; and a particulate alloy element which is capable of forming, during the sintering of the composition conformed by compaction or by injection molding, a liquid phase, agglomerating the solid lubricant in discrete particles. The composition may include an alloy component to stabilize the alpha-iron matrix phase, during the sintering, in order to prevent the graphite solid lubricant from being solubilized in the iron. The invention further refers to a self-lubricating sintered product, obtained from the composition, and to the process for obtaining said product.

Metallurgical composition of particulate materials, self-lubricating sintered products and process for obtaining self-lubricating sintered products

The plasma reactor defines a reaction chamber provided with a support for the metallic pieces and an anode-cathode system, and a heating means is mounted externally to said plasma reactor. The plasma process, for a cleaning operation, includes the steps of connecting the support to the grounded anode and the cathode to a negative potential of a power source; feeding an ionizable gaseous charge into the reaction chamber and heating the latter at vaporization temperatures of piece contaminants; applying an electrical discharge to the cathode; and providing the exhaustion of the gaseous charge and contaminants. A subsequent heat treatment includes the steps of: inverting the energization polarity of the anode-cathode system; feeding a new gaseous charge to the reaction chamber and maintaining it heated; applying an electrical discharge to the cathode; and exhausting the gaseous charge from the reaction chamber.

Plasma process and reactor for treating metallic pieces

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Roberto Binder