Abstract: The invention concerns a method for photopolymerizing a polymerisable coating applied on a substrate as well as an installation for implementing said method, enabling very high quality coatings to be obtained and polymerization time to be significantly reduced. Said method is essentially characterized in that it consists in performing at least two rapid simultaneous or successive exposures of the coating deposited on the substrate to infrared rays having different wavelengths derived from at least one generator of short infrared rays (22a) and from at least one generator of medium infrared rays (22b) arranged on the side of said substrate surface (23). The invention is useful for coating industrial and/or household objects made of wood, metal, synthetic or composite materials, or mixtures thereof or the like.

Abstract: The invention concerns a method which consists in maintaining the two ends (2, 4) of the bar (1) on the end supports (3, 5) of a frame (10), one of the ends (2) being maintained fixed, and in driving the bar in rotation. The invention is characterised in that it consists further in drawing the bar (1) while spraying a coat on the bar, the drawing of the bar corresponding to an elongation of about 0.2 to 0.001%.

Abstract: The invention concerns a non-stick coating (4) for cooking utensils (1) characterized in that it is selected among the group comprising (a) ceramics alone selected among titanium oxynitride, titanium suboxides, titanium subnitrides, spinels, mixed spinels; and (b) ceramo-metallic mixtures wherein the ceramics are selected among titanium oxynitrides, titanium suboxides, titanium subnitrides, spinels, cerium fluoride, silicon carbide, pyrolitic carbon, boron carbide, and the metal is titanium.

Abstract: The invention concerns a coating bar for pulp and paper manufacture, comprising a substrate coated over at least the greater part of its surface with a coat comprising a ceramic, characterised in that the coat consists of a mixture of ceramics, the coat having a wettability angle between 30° and 90°, and porosity less than 5%, the size of the pores being less than 5 &mgr;m.

Abstract: The invention concerns a coating bar for pulp and paper manufacture, comprising a substrate coated over at least the greater part of its surface with a coat comprising a ceramic, characterised in that the coat consists of a mixture of ceramics, the coat having a wettability angle between 30° and 90°, and porosity less than 5%, the size of the pores being less than 5 &mgr;m.

Abstract: The invention concerns a method which consists in maintaining the two ends (2, 4) of the bar (1) on the end supports (3, 5) of a frame (10), one of the ends (2) being maintained fixed, and in driving the bar in rotation. The invention is characterised in that it consists further in drawing the bar (1) while spraying a coat on the bar, the drawing of the bar corresponding to an elongation of about 0.2 to 0.001%.

Abstract: Nonstick ceramo-metallic coating for cooking utensils The invention concerns a non-stick coating (4) for cooking utensils (1) characterized in that it is selected among the group comprising (a) ceramics alone selected among titanium oxynitride, titanium suboxides, titanium subnitrides, spinels, mixed spinels ; and (b) ceramo-metallic mixtures wherein the ceramics are selected among titanium oxynitrides, titanium suboxides, titanium subnitrides, spinels, cerium fluoride, silicon carbide, pyrolitic carbon, boron carbide, and the metal is titanium.

Abstract: Heat-treatment device which includes a cooling unit comprising delivery nozzles which deliver at least one coolant, characterized in that it furthermore comprises a shielding element designed so as to maintain a gaseous shielding atmosphere around at least part of the delivery nozzles.

Abstract: The invention provides an apparatus for depositing particulate or powder-like material on the surface of a substrate. The apparatus comprises a hollow tube-like chamber consisting of a heat-resistant material, in which a plasma torch is generated. By means of a device for supplying solid particulate or powder-like material, the material is molten in the plasma torch and deposited on the surface of the substrate. In order to achieve a uniform temperature distribution in the plasma torch, the apparatus comprises at least two induction coils located at the outer surface of the hollow tube-like member and a high frequency generator means having at least two generator sections. A first of the at least two generator sections generates energy with a first higher frequency and a second of the at least two generator sections generates energy with a second lower frequency.

Abstract: The apparatus serves for treating workpieces by means of a plasma torch in a gaseous, preferably in an inert gaseous atmosphere. For this purpose, there is provided a gas-tight container and, in the interior of the container, a plasma gun as well as a cooling member for cooling the treated workpiece by a gaseous cooling medium stream. The cooling medium is a gas circulating in a closed circuit. Thus, the cooling gas can continuously used because heat is removed from the gas in a heat exchanger. A cooling operation can be realized in this way in temperature regions which are much higher than if liquefied gas is used.

Abstract: An apparatus for forming ceramic or metal powders has a plasma generator, a source of material in the form of powder particles and a projection torch for passing the material through the plasma to melt the powder particles and then projecting a stream of plasma and material via an outlet. A container is provided for containing the projected stream. A plurality of spray diffusers are arranged to diffuse a spray of cryogenic liquid into a space through which the projected stream travels, whereby the projected stream is quenched. A console controls the flow rates of the powder particles and the plasma into the projection torch.

Abstract: A process for the surface treatment of a part wherein it comprises subjecting the surface of said part in an inert atmosphere to the action of a hot gaseous arc plasma, and followed by the immediate cooling of the thus treated surface by projecting on to the same a cooling liquid at a temperature close to its saturation point which is a temperature whose variation from the saturation temperature does not exceed 15.degree. C.

Abstract: The invention relates to a process for the production of porous products of boron or boron compounds.This process comprises the following stages:(1) suspending the boron powder in a solution of an alkali metal salt, hydroxide and/or oxide,(2) then separating the powder from the suspension liquid by settling,(3) drying the thus separated powder to obtain an agglomerated powder, and(4) subjecting the thus obtained agglomerated powder to at least two heat treatments performed at different temperatures, the final stage of the heat treatment being performed at a temperature of 1500.degree. to 2200.degree. C. and the first stage being performed at a temperature below that of the final stage.The heat treatment can be performed in three stages, as shown in the attached graph.

Abstract: The invention relates to a process and an apparatus for coating a member by plasma spraying.According to the invention, the pressure and composition of the atmosphere prevailing in the enclosure in which the operation takes place are constantly checked. The temperature of the member is regulated with the aid of a cooling system and the relative displacements of the member, the gun and the cooling system are automatically controlled.Application to the deposition of protective coatings on metal members or on composite materials.