Disclosed are an additive raw material composition and an additive for superhard material product, a method for preparing the additive, a composite binding agent, a superhard material product, a self-sharpening diamond grinding wheel and a method for manufacturing the same. The raw material composition consisting of components in following mass percentage: Bi2O3 25%40%, B2O3 25%40%, ZnO 5%25%, SiO2 2%10%, Al2O3 2%10%, Na2CO3 1%5%, Li2CO3 1%5%, MgCO3 0%5%, and CaF2 1%5%. The composite binding agent is prepared from the additive and a metal composite binding agent. The self-sharpening diamond grinding wheel prepared from the composite binding agent has high self-sharpness, high strength, and fine texture, is uniformly consumed during the grinding process, does not need to be trimmed during the process of being used, and maintains good grinding force all the time, fundamentally solving the problems of long trimming time and high trimming cost of the diamond grinding wheel.

An abrasive article comprising: a body comprising abrasive grains contained within a bond material comprising a metal or metal alloy, wherein the body comprises a ratio, (V.sub.AG/V.sub.BM), of volume of abrasives (V.sub.AG) to volume of bond (V.sub.BM), of between about 0.127 and about 1.27, wherein (V.sub.AG) is a volume percent of abrasive grains within the total volume of the body, (V.sub.BM) is the volume percent of bond within the total volume of the body, wherein the body could have about 15% to about 55% porosity, more preferably about 20% to about 55% and most preferably 25% to 55% porosity, wherein the bond material comprises at least 1% of an active bond composition of the total volume of the bond, a portion of which is at the interface of the abrasive grains and the bond material.

A coated abrasive article comprises a backing having first and second opposed major surfaces. A make layer is bonded to the first major surface. Agglomerate grinding aid particles are directly bonded to the make layer. At least a portion of the agglomerate grinding aid particles comprise grinding aid particles retained in a binder, and are arranged according to an open predetermined pattern. Abrasive particles are directly bonded to the make layer in spaces between the agglomerate grinding aid particles. A size layer is directly bonded to the make layer, agglomerate grinding aid particles, and abrasive particles. A method of making a coated abrasive article, in which the agglomerate grinding aid particles are deposited onto a curable make layer precursor prior to depositing abrasive particles onto the curable make layer precursor in spaces between the agglomerate grinding aid particles is also disclosed.

An abrasive article includes a body having abrasive grains contained within a bond material comprising a metal or metal alloy, wherein the body comprises a ratio of V.sub.AG/V.sub.BM of at least about 1.3, wherein V.sub.AG is the volume percent of abrasive grains within the total volume of the body and V.sub.BM is the volume percent of bond material within the total volume of the body.

Methods for manufacturing bonded abrasive articles, for example vitrified bonded grinding wheels. A bondable abrasive composition is prepared including abrasive particles, a binder medium and a gamma-pyrone pore inducing material, such as ethyl maltol. A precursor abrasive structure is formed from the composition. The gamma-pyrone pore inducing material is removed from the precursor abrasive structure to provide a porous precursor abrasive structure that is further processed to provide a bonded abrasive article. In some embodiments, the binder medium includes a vitreous bonding material, and the bonded abrasive article is a porous vitrified bonded grinding wheel.

An abrasive tool can have a body including an abrasive portion with abrasive grains contained within a matrix material. A first reinforcing member can be contained within the body. The body can also include a porosity variation difference through at least half of a thickness of the body of not greater than 250% from a mean porosity of the body.

Polishing tools and methods of polishing a glass substrate are disclosed. A polishing tool (200) includes a stem (220) and a polishing material (210) bonded to the stem (220). The polishing material (210) includes, in volume concentration, about 18% to about 42% phenolic resin, about 18% to about 30% zinc oxide, about 1% to about 10% magnesium oxide, a cooling agent, and an abrasive.

A grinding apparatus includes: a holding table for holding a workpiece thereon; a grinding unit including a grinding wheel for grinding the workpiece held on the holding table, the grinding wheel including a grinding stone made of abrasive grains and grains of photocatalyst bonded by a vitrified bonding material; a grinding water supply unit configured to supply grinding water to the grinding stone when the workpiece held on the holding table is ground by the grinding unit; and a light applying unit disposed adjacent to the holding table and configured to apply light to a grinding surface of the grinding stone while the workpiece held on the holding table being ground.

The present invention relates to a grinding disk or wheel, flap disk or cut-off disk which will increase the effectiveness of each battery charge during tool use.

An abrasive article is provided that may include a body. The body may include a bond component and abrasive particles within the bond component. The bond component may include a FeCoCuNiSn based bond material and a performance enhancing material. The performance enhancing material may include hex-boron nitride. The content of the performance enhancing material may be at least about 6 vol. % and not greater than about 14 vol. % for a total volume of the bond component.