An abrasive composite, a method for making the abrasive composite, and a polishing apparatus using the abrasive composite are disclosed. The abrasive composite includes a matrix and a plurality of nano-particles distributed therein. The nano-particles are made of at least nano carbon sphere particles and fullerene particles. A ratio by weight of the nano carbon sphere particles to the fullerene particles is advantageously in the range from about 1:2 to about 1:1. The fullerenes are preferably C....

According to the invention, the composition contains an abrasive material (12.5-37.5 vol.-%), a metallic filler (30-60 vol.-%), a mineral binder (5-30 vol.-%) and the balance is an organic binder. The mineral binder is constituted by at least one substance from a group of salts whose melting temperature corresponds to the temperature range of polymerization of the organic binder.

Abrasives based on finely divided abrasive particles bonded to one another and/or to a support by means of a binder, where the binder is the solid component of an aqueous polymer dispersion which is obtainable by polymerizing unsaturated monomers which can be polymerized by means of free radicals, in the aqueous phase in the presence of a monosaccharide, oligosaccharide, polysaccharide, oxidatively, hydrolytically and/or enzymatically degraded polysaccharide, chemically modified monosaccharide, ...

Extremely fine abrasive particles are incorporated in an elastomeric resin body or coating to produce abrasive articles exhibiting cushioned or resilient yielding qualities having a dual response to in-service conditions. These performance characteristics are accomplished by a structure whose working surface and underlying supporting means produce two distinct and complementary abrading actions, one hard enough to sharpen a hardened cutting tool and to smooth the adjacent surface, and a second o...

By fluorinating diamond grit, the grit may be readily bonded into a fluorocarbon resin matrix. The matrix is formed by simple hot pressing techniques. Diamond grinding wheels may advantageously be manufactured using such a matrix. Teflon fluorocarbon resins are particularly well suited for using in forming the matrix.

Coated abrasive material is provided having a supersize layer thereon which improves grinding. This layer comprises an elastomeric material having substantial residual unsaturation and an active solid, particulate grinding aid.

A diamond abrasive article preferably in the form of a grinding wheel, the work-contacting portion of which has a resinoid body containing metal coated diamond particles and also containing powdered metal of two kinds, one of the powdered metals having a relatively low melting point and the other having a substantially higher melting point, such as tin and copper, respectively.

Abrasive grains rigidly bonded to each other form aggregates which are dispersed in a resilient matrix of an abrasive wheel so that the aggregates do not significantly interfere with each other's individual movement under grinding stresses against the resilient restraint of the matrix. The wheels remove metal from a workpiece much faster and lose less abrasive material than corresponding wheels in which the same abrasive particles are individually embedded in the same matrix.

A toothbrush with bristles containing a far-infrared emitting material and multi-element minerals is disclosed. The negative ions and radiation emitted from the bristles stimulate the cells of the gums and help prevent periodontal conditions.

A power amplifier protection circuit that includes protection circuitry to variably shunt an input radio frequency (RF) signal to AC ground, turn off bias to an output transistor of a power amplifier, and turn off the output transistor. The power amplifier protection circuit features an asymmetrical control that can quickly shut off a power amplifier, and turn on the power amplifier at a steady, controlled rate when an output transistor exceeds a predetermined threshold voltage.