| 摘要 |
An abrasive article comprises at least one abrasive particle tenaciously bonded to a bonding matrix the bonding matrix containing as its essential constituents 13 to 54% copper, 2 to 33% tungsten, 10 to 50% iron, 8 to 36% nickel, 1 to 25% chromium, 1 to 6% tin, 0.2 to 2.5% carbon, 0.4 to 7% boron and 0.1 to 2.3% silicon, the bonding matrix having a micro structure characterized by tungsten carbide and chromium boride particles bonded in a lattice comprising a solid solution consisting essentially of nickel, iron, copper, chromium, tin, carbon, boron and silicon having dispersed throughout a complex eutetic consisting essentially of nickel, chromium, boron, silicon, and iron. In one form the article comprises a single large diamond particle attached to a holder by the bonding matrix, the diamond particle either having a single point or a cluster of points; in another form the abrasive article is a wheel comprising a hub section adapted to be mounted on a rotatable shaft and a portion consisting of the bonding matrix with particles distributed substantially uniformly therethrough; the percentage by volume of the diamond particles can range from 5% by volume up to 76% by volume of the material consisting of the diamond particles and the bonding matrix. The bonding matrix material is produced in the form of a powder and this is packed in a steel or carbon mould around the diamond particle or particles to be bonded and sintered at a temperature of 1800 DEG to 1850 DEG F. at a pressure from 15 to 20 p.s.i. Other hard abrasive particles instead of diamond particles can be used.ALSO:An abrasive article comprises at least one abrasive particle tenaciously bonded to a bonding matrix the bonding matrix containing as its essential constituents 13 to 54% copper, 2 to 33% tungsten, 10 to 50% iron, 8 to 36% nickel, 1 to 25% chromium, 1 to 6% tin, 0.2 to 2.5% carbon, 0.4 to 7% boron and 0.1 to 2.3% silicon. The bonding matrix has a micro-structure characterized by tungsten carbide and chromium boride particles bonded in a lattice comprising a solid solution of nickel, iron, copper, chromium, tin, cobalt, carbon, boron, silicon, and iron. In one form the article comprises a single large diamond particle attached to a holder by the bonding matrix; in another form, the abrasive article is a wheel comprising a hub section adapted to be mounted on a rotatable shaft and a portion consisting of the bonding matrix with particles distributed substantially uniformly therethrough. The percentage by volume of the diamond particles can range from 5% by volume up to 76% by volume of the material consisting of the diamond particles and the bonding matrix. The bonding matrix material is produced in the form of a powder and this is packed in a steel or carbon mould around the diamond particle or particles to be bonded and sintered at 1800 DEG -1850 DEG F. at a pressure of 15 to 20 p.s.i. Other hard abrasive particles instead of diamond particles can be used.
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