SINTERED VITRIFIED SUPERFINISHING GRINDSTONE
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United States of America Patent
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Sep 13, 2018
app pub date -
Aug 5, 2015
filing date -
Aug 5, 2015
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Abstract
A sintered vitrified superfinishing grindstone is provided which is a sintered product which is obtained by compression molding of a mixed powder of: a sinterable vitrified binder composed of a powder of a borosilicate glass composition; hard abrasive grains; and soft abrasive grains; and which includes bonded portions formed by necking due to heat compression, between particles of the powder of the borosilicate glass composition which are in contact with each other; and wherein the sinterable vitrified binder contains from 94 to 100% by mass of a powder composed of a low-melting-point borosilicate glass composition containing from 35 to 55% by mole of SiO2; from 3 to 5% by mole of A12O3; from 10 to 35% by mole of B2O3; and from 25 to 30% by mole of R2O+RO.
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