The invention relates to the use of a powder in a powder jet device for cleaning tooth surfaces by powder spraying, wherein the powder comprises rhamnose and/or arabinose. The invention also relates to a process for cleaning tooth surfaces with a powder jet device, wherein a powder comprising rhamnose and/or arabinose is used.

Described are finishing mediums for removing support material and/or for surface finishing of objects made via additive manufacturing techniques. The finishing medium is an aqueous solution containing 1-20% by weight a polyol, 1-20% by weight an anti-corrosion agent, 0.001-10% by weight a hydrotrope. The finishing medium may optionally suspend media particles, thereby forming a finishing suspension. Also described are methods of using the finishing media and finishing suspensions described herein.

The present invention is directed to a coated substrate comprising: (a) a surface that has been impacted with an abrasive particle and a dopant such that at least some portion of the surface becomes attached with the dopant; and (b) a film-forming layer on at least a portion of the impacted surface, wherein the film-forming layer has been deposited from a film-forming composition; wherein the surface is impacted substantially simultaneously with the abrasive particle and the dopant; and wherein when the dopant comprises iron phosphate, zinc phosphate, manganese phosphate, cerium oxide, the film-forming composition is not a two-component epoxy clear coat.

Provided is an abrasive material having a grinding force more appropriate to the purpose of surface finishing. The abrasive material is intended to be used for surface finishing by spraying onto a workpiece, and comprises a plurality of abrasive material particles each comprising a core, a binder, and an abrasive grain layer formed on a surface of the core via the binder, wherein the binder is a mixture of a non-curable adhesive used as a main ingredient to provide tackiness and another agent used to adjust hardness according to a desired surface roughness of the workpiece. The hardness of the binder is adjusted to be higher or lower than that of the non-curable adhesive itself as a main ingredient. The binder may have the property of a cured material or the property of a fluid.

A method for manufacturing a compressor scroll that appropriately impinges cavitation bubbles on target regions of a scroll. The method includes the step of water jet peening by jetting cavitation bubbles generated underwater by a water jet at a first side of an end plate (13A) of the scroll (13), with a center (P1, P2, P3) of the cavitation bubbles being offset from a center (O) of the spiral shape of a wall portion (13B) on the end plate (13A) and the step portion (13Aa) and the stepped portion (13Ba) positioned at an outer peripheral portion of the cavitation bubbles (C).

A metal surface treatment method wherein the surface (10) is simultaneously bombarded with a mixture of abrasive particles (4) and dopant particles (6) which are delivered at a velocity in the range of 50-250 m/sec, and thereby depositing the dopant material on the surface. Also provided is an article (8) having a surface treated by such a method.

Methods and devices for treatment of metal surfaces by means of electrically active solid particles that include a step of contact of the solid particles with the electrode of an electric source, a step of shooting the particles towards the metal surface to be treated and a step of transmission of electric charge of the particles on the metal surface to be treated. The transmission of the electricity between the electric source and the metal surface during the step of shooting preferably is by net charge of the particles or by electric conductivity by contact or by electric conductivity by means of voltaic arches. The current applied to the electrode is preferably a DC or a current that contains positive sections and negative sections.

A suspension medium for improved grit delivery in vapor blast operations sets forth addition of a suspending-agent to a blast solution whereby solids are maintained in suspension absent agitation or mixing for at least 60 hours. The suspending agent increases the viscosity and/or density of the blast solution to increase the buoyancy force and/or acts as a dispersant and/or surfactant to maintain suspension of solids in solution over the extended time period. Different concentrations of suspending-agent may be employed with different grit and solid sized particles, depending on the application of vapor blasting at hand. The suspending-agent is preferably biodegradable.

A rust inhibiting process for cleaning and protecting a target object is disclosed. Comprising mixing at least a rust inhibitor and a fluid into a slurry mixture, spraying the slurry mixture at the target object from within a reservoir of a slurry blasting system, separating a tarnished top layer and a parent metal of the target object with a slurry stream, cleaning the parent metal with the rust inhibitor, preventing the parent metal from impregnating with contaminants during cleaning with the rust inhibitor, and protecting the parent metal with the rust inhibitor after spraying is complete. The slurry stream comprises the slurry mixture of the slurry blasting system being sprayed with the slurry blasting system. The slurry blasting system comprises a tank.

An abrasive water-jet cutting machine, comprising pumping means, fluidly connectable to a water source, a cutting head, comprising a mixing chamber, a dispensing system of powdered abrasive material, comprising a tank, a supply tube and an actuator interposed between the tank and the supply tube, which delivers the powdered abrasive material contained in the tank into the mixing chamber, through the supply tube; wherein the cutting head mixes, in the mixing chamber, the abrasive material with the water jet forming a water-abrasive material mixture jet, and said cutting head delivers the water-abrasive material mixture jet; wherein the powdered abrasive material delivered into the mixing chamber is homogeneously dispersed in suspension in a water-based gelatinous fluid; and wherein the actuator is a peristaltic pump.