14 results about "Abrasive" patented technology

A slurry composition for chemical mechanical polishing (CMP) of a phase-change memory device is provided. The slurry composition comprises deionized water, a nitrogenous compound, and optionally abrasive particles, an oxidizing agent, or a combination thereof. The slurry composition can polish a phase-change memory device at a high rate, can achieve high polishing selectivity between a phase-change memory material and a polish stop layer (e.g., a silicon oxide film), and can minimize the occurrence of processing imperfections (e.g., dishing and erosion) to provide a high-quality polished surface. Further provided is a method for polishing a phase-change memory device using the slurry composition.

The invention discloses an elastic abrasive cloth and an elastic grinding wheel. The external layer of the elastic layer is provided with a grinding material layer; grinding grains are arranged intermittently. The elastic grinding wheel comprises a supporting base and elastic abrasive cloth; the elastic abrasive cloth comprises the elastic layer and the grinding grains; the external surface of the elastic layer is provided with a grinding grain layer with the grinding grains arranged intermittently; the supporting base is designed into various shapes according to requirements; the external profile is parallel to the shape of the elastic abrasive cloth; the elastic abrasive cloth is directly sheathed on the external surface of the supporting base to form the elastic grinding wheel. The invention has simple structure, convenient manufacture and low cost, can be made into the elastic abrasive cloth with various shapes, and can grind and polish workpieces with different dimensions and different shapes. The invention can form the elastic grinding wheel when being connected with the supporting base of a sander; furthermore, the invention can be repeatedly applied, with high jointing precision. When the grinding grains are completely consumed, the new abrasive cloth can be used for directly replacing the old abrasive cloth, with simple, convenient and fast operation.

The invention discloses an abrasive-containing emulsifying compound metal cutting solution. The cutting solution is characterized by being prepared from the following raw materials in parts by weight: 3-5 parts of aluminum hydroxide powder, 1-2 parts of hydroquinone, 2-4 parts of aluminum nitride, 4-6 parts of nano medical stone powder, 1-2 parts of stannous chloride, 2-3 parts of sodium metasilicate pentahydrate, 5-6 parts of sodium dibutyl naphthalene sulfonate, 1.5-2.5 parts of propylene glycol alginate, 2-4 parts of alpha-sulfomonocarboxylate, 5-7 parts of aid and 200 parts of deionized water. The added abrasive such as the nano medical stone is matched with a surfactant, so that the cutting solution disclosed by the invention has good dispersibility and abrasion resistance and has the effects of sterilization and deodorization; the abrasion resistance, dispersibility, lubricity and film-forming property are strengthened by adding the aid; the aid is matched with the surfactant, so that the cutting solution has excellent lubricity, abrasion resistance and cleaning and cooling property; the cutting solution disclosed by the invention, which is in the shape of water-based emulsion, is excellent in performance, simple and feasible in processing technology and low in cost.

The invention provides an efficient preparation method of ultra-precision cutting abrasive sand. The method comprises the following steps: roughly crushing iron-aluminum type garnet crude ore; sequentially processing by scrubbing and sieving through a rotary screen, washing with water through a screw sand washer, and overflowing to deslime; carrying out gravity concentration through a spiral chute to obtain fine-graded garnet with purity reaching 60 to 70%; washing with water again through the screw sand washer; drying to obtain dried and fine-graded garnet sand with water content less than 0.2%; removing dust through a cyclone separator; magnetically separating; removing dust again to obtain fine garnet sand with purity more than 97%; then screening by grades through an ultrasonic sound sieve to obtain cutting garnet sand, wherein the particle size distribution of the cutting garnet sand is that the cutting garnet sand with particle size ranging from 0.045 to 0.053mm is less than 8% in content, and the cutting garnet sand with particle size ranging from 0.053 to 0.1mm is more than 92% in content. The method is simple and high in operability, and the prepared garnet-based cutting abrasive sand is uniform in particle size, high in mobility, and high in cleanness.

The invention discloses a device for on-line ultrasonic dressing of a coarse-grained superhard abrasive grinding wheel. Within the time of suspending of grinding machining of the grinding wheel, a detecting device utilizes an angle control encoder to control an industrial camera used for extracting images to rotate, a camera lens scans and takes pictures from the end away from the grinding wheel to the position, perpendicularly close to the grinding wheel, of the camera, then the images are uploaded to a computer and processed through an openCV, and if it is detected that grinding wheel abrasive particles are not subjected to large-area abrasion, the detecting device rotates the camera to get away from the grinding wheel; and if it is detected that the grinding wheel abrasive particles areseriously abraded, machining is suspended continuously, the industrial camera rotates to get away from the grinding wheel, a dressing device moves to the position of the grinding wheel, the coordinates of the contour of abrasive particle abrasion accumulating areas are output, a G code is generated, a tool on an ultrasonic device is controlled to dress on the abraded position, and after dressingis completed, the ultrasonic device moves to the outmost side of a worktable. According to the device, the ultrasonic device is utilized to detect and dress the grinding wheel under the situation of not detaching the grinding wheel, and the machining quality and efficiency of the grinding wheel are improved.

The invention provides a clamping device applied to trimming the arc surfaces of abrasive blocks of a grinding wheel. The clamping device comprises a circular ring-shaped outer cover, and fixture bodies for clamping the circular arc-shaped abrasive blocks, wherein a plurality of fixture bodies are evenly distributed and connected onto the outer cover by adopting the circle center of the outer cover as the center. The fixture bodies comprise clamping front pressing plates, clamping rear bottom plates, connecting screws and clamping screws; the clamping front pressing plates and the clamping rear bottom plates are connected and fixed through the connecting screws; the circular arc-shaped abrasive blocks are clamped between the clamping front pressing plates and the clamping rear bottom plates; and the clamping forces of the clamping front pressing plates and the clamping rear bottom plates on the circular arc-shaped abrasive blocks are adjusted through the clamping screws. The clamping device provided by the invention is simple in structure, good in economical efficiency, convenient to install, and capable of effectively ensuring the yield and processing the abrasive blocks in largevolumes, so that the consistency of the abrasive blocks is high, and a favorable basis condition is provided for the next working procedure.

The present invention provides an aqueous CMP slurry composition that comprises abrasive particles and Aspartame. The CMP slurry composition according to the invention is selective for polishing silicon dioxide in preference to silicon nitride from a surface of an article by chemical mechanical planarization. Furthermore, as more Aspartame is added to the slurry, the silicon dioxide rate is either not greatly affected or increases and the silicon nitride rate stays extremely low. In addition to offering selectivity of silicon dioxide to silicon nitride polishing, the present invention provides a method of using Aspartame as a polish accelerant in silicon dioxide polishing.

A machine tool includes a main shaft unit (12); a polishing head (14) for processing a workpiece (100); and an unnecessary byproduct leakage preventing unit (16) for preventing leakage of abrasive resulting from processing at or around a part of the workpiece(100), the part being processed, and wherein the unnecessary byproduct leakage preventing unit (16) includes a cover (32) provided separatelyfrom the polishing head (14), the cover (32) having a structure that is open in three directions and that has walls in another three directions such that a protection space (33) where to hold a partof the workpiece (100) is defined, the cover (32) for receiving the abrasive, and a movement mechanism (30) for moving the cover (32) so as to stay apart from the workpiece (100) while the workpiece is not being processed and so as to have a part of the workpiece (100) held in the protection space (33) while the workpiece (100) is being processed.

The invention discloses a feeding device of resin co-grinding and burdening. The feeding device comprises a weighing hopper, a stirring and material grinding device, a supplying device, a pipe chain conveyor, a stirring assembly and a material grinding assembly; a first feeding piece is arranged at the top of the weighing hopper, and a first material receiving piece is arranged at the bottom of the weighing hopper; a second feeding piece is arranged at the top of the stirring and material grinding device, a stirring chamber and a material grinding chamber are arranged in the stirring and material grinding device, and a third material receiving piece is arranged at the bottom of the stirring and material grinding device; the supplying device is positioned below the stirring and material grinding device, a third feeding piece is arranged on the supplying device, a fourth material receiving piece is further arranged on the supplying device, and a fourth feeding piece is arranged on the pipe chain conveyor; and the pipe chain conveyor is further provided with a discharging piece used for discharging, and a discharging port of the discharging piece faces a feeding port of a processing device. According to the device, the weighing hopper, the stirring and material grinding device, the supplying device and the pipe chain conveyor are arranged, materials are weighed, stirred, ground, conveyed and fed in sequence, so that time and labor are saved, automation degree is high, controlling is facilitated, and feeding efficiency is high.