A method for the surface treatment of workpieces by means of abrasive media, and a surface treatment composition. The method comprises the steps of providing a treatment tool, providing an abrasive medium, supplying a workpiece having a surface to be treated, surface treating the workpiece, involving removal of material and producing waste products, and processing the waste products, wherein at least one of said steps comprises adding an additive to lower a self-ignition tendency on the part of the waste products, the additive comprising a salt, composed of a carbonate and/or of a halogen anion.

A high-pressure liquid jet cutting system can include a hopper configured to contain an abrasive mixture that includes abrasive and an additive, and a cutting head configured to receive the abrasive mixture from the hopper and introduce the abrasive mixture into a high-pressure liquid jet. The system can further include a sensor configured to detect a characteristic of the abrasive mixture associated with the additive, and one or more processors operably connected to the sensor and configured to determine information about the abrasive based, at least in part, on the detected characteristic. The one or more processors can be configured to adjust or otherwise control operation of one or more components of the high-pressure liquid jet cutting system based, at least in part, on the information to, e.g., improve or optimize system performance.

Disclosed is an apparatus for water jet cutting including: a water source; a pump communicating with the water source, generating a high pressure water flow; a tank containing an abrasive material in suspension, including a fluid and abrasive particles dispersed homogeneously in the fluid; and a cutting head in fluid communication with the pump and the tank, the cutting head including a mixing chamber. The tank of the abrasive material in suspension is in communication with the cutting head by an abrasive inlet channel and the cutting head is configured to generate a vacuum pressure that draws the abrasive material in suspension through the abrasive inlet channel toward the mixing chamber to mix the abrasive material in suspension and the high pressure water and form a jet of water and abrasive. Also disclosed is a method for generating a water jet cut that can be implemented with the apparatus.

A method of cleaning and sanitizing surgical tools or surgical instruments and accessories in general, and a device configured to implement the method. The method includes the use of a an abrasive cleaning material, which is emitted under pressure and at high speed to abrade and remove substances that adhere to the surfaces of the instruments and accessories, and the pressure of which can be regulated according to the type of surface to be cleaned.

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.

Disclosed is an apparatus and method for treating a substrate. The method includes supplying cleaning particles to the substrate to clean the substrate. The cleaning particles are solid particles. The solid particles provide a shock wave to the substrate.

An erosive jet can propel degradable, abrasive grit conveyed in a carrier fluid to erode a downhole structure, such as a tubular (e.g., cutting through a tubular) or formation (e.g., perforation actions). The abrasive grit can be selected to degrade or dissolve in the wellbore fluid (e.g., in carrier fluid pumped into the wellbore or in fluid originating from the wellbore). The abrasive grit can provide increased cutting or erosion efficiency in the erosive jet during the cutting operation, then may degrade (e.g., dissolve) in the wellbore fluid to avoid certain complications, such as clogging or residue build-up in the wellbore formation or on downhole equipment. A degradation accelerator can be introduced (e.g., in carrier fluid) to accelerate degradation of the abrasive grit in the wellbore fluid. Degradation accelerators can be temperature-activated, pH-activated, or otherwise time-delayed so the abrasive grit remains sufficiently intact to perform the desired erosion operation.

In a coating method example, a coating is formed on a part precursor by blasting the part precursor with a blast medium. The blast medium includes blasting beads and a coating agent. The part precursor is formed from a polymeric build material, and a hardness of the blasting beads is greater than a hardness of the polymeric build material.

An abrasive media blaster assembly includes a container to hold at least one abrasive media, an external air source to provide a compressed air supply, a reservoir to hold water and rust inhibitor solution and a venturi blaster gun. The venturi blaster gun comprises an exterior nozzle, a media blaster block and a trigger with a handle. The fittings in the media blaster block create a venturi effect and draw the water and rust inhibitor solution so as for it to mix with the abrasive media where the dustless blaster sprays the mix to remove surface finishes from a metal surface and simultaneously provides a rust inhibitor to the surface, thereby allowing the device to be capable of performing any one, two or all of dry media blasting, slurry blasting, and water blasting.

Powder chamber for an air polishing device, extending from a top end to a bottom end along an axis, said powder chamber including at least two wall sections, where a first wall section forms a first angle with respect to the axis, and wherein a second wall section forms a second angle with respect to the axis, wherein the angles are measured in a measuring direction from the axis to the appropriate wall section in such a manner so that the acute angles are obtained, wherein the measuring direction) from the top end to the bottom end is counted positive, and wherein the measuring direction from the bottom end to the top end is counted negative, wherein the second wall section is arranged below the first wall section, and wherein the second angle is smaller than the first angle.