Saint-gobain Centre De Recherches Et D'etudes Europeen

Saint-gobain Glass France

Saint-gobain Coating Solution

Saint-gobain Coating Solutions

Dominique Billieres

Nicolas Nadaud

Howard Wallar

Alain Allimant

Alain Alimant

Powder of particles, more than 95% by number of said particles exhibiting a circularity greater than or equal to 0.85, wherein said powder contains more than 99.8% of a rare earth oxide and/or of hafnium oxide and/or of yttrium aluminum oxide, as percentage by weight relative to the oxides, and has: a median particle size D 50 of between 10 and 40 microns and a size dispersion index (D 90&#x2212;D 10)/D 50 of less than 3; a percentage by number of particles having a size less than or equal to 5 &#x3bc;m which is less than 5%; an apparent-density dispersion index (P&#x3c;50&#x2212;P)/P of less than 0.2, the cumulative specific volume of the pores which have a radius of less than 1 &#x3bc;m being less than 10% of the apparent volume of the powder, in which the percentiles Dn of the powder are the particle sizes corresponding to the percentages, by number, of n %, on the curve of cumulative distribution of the particle size of the powder, the particle sizes being classified in increasing order, the density P&#x3c;50 being the apparent density of the fraction of particles having a size less than or equal to D50, and the density P being the apparent density of the powder.

Highly pure powder intended for thermal spraying

The invention relates to a plasma torch, comprising: a plasma generator comprising a cathode extending along an axis X and an anode (), the cathode and the anode being arranged so as to be capable of generating, in a chamber (), an electric arc between the anode and the cathode due to an electrical voltage, the plasma generator also comprising a plasmagen gas injection device () comprising an injection pipe () leading, along an injection axis (I), to an injection opening () in the chamber; a means for injecting a material to be discharged into a plasma flow generated by said plasma generator, the plasma torch being characterized in that: the relationship R&#x2033; between: the radial distance (y) of said injection opening, defined as the minimum distance between the axis X and the center of said injection orifice; the largest transverse size (D) of the cathode in the region of the chamber downstream from the position P, wherein Pdenotes the axial position of maximum radial mutual encroachment of the anode and the cathode, is less than 2.5; and the projection of the injection axis (I) into a transverse plane passing through the center of the injection orifice of said injection conduit forms an angle &#x3b2; less than 45&#xb0; with a radius extending into said transverse plane and passing through the axis X and through the center of said injection orifice.

Plasma torch with a lateral injector

Coating for a device for forming glass products

Method of producing a target by thermal spraying, especially by plasma spraying, said target comprising at least one compound based on atoms of different types chosen especially from the constituents M belonging to the (Zr, Mo, Ti, Nb, Ta, Hf, Cr) family and silicon, characterized in that at least one fraction of said compound, the constituents of which are bonded by covalent and/or ionic and/or metallic bonds, is injected into a plasma jet, said plasma jet spraying the constituents of said compound onto the target so as to deposit a coating of said compound on a surface portion of said target.

Method for preparing by thermal spraying a silicon-and zirconium-based target

Growing community of inventors

Saint Saturnin les Avignon, France

Dominique Billieres