Process of producing self-bonded ceramic abrasive wheels
AssigneeNorton Company
InventorsLee A. Carman, William S. Coblenz, Janet L. Hammarstrom
Life of this patent
Estimating the term…
Abstract
A grinding tool is described which comprises self-bonded particles of a ceramic abrasive and has a voids volume of from 5 to 65%.
Claims13
A process for the production of a grinding tool which comprises forming a shape from a formable mixture comprising a sol or gel of boehmite having dispersed therein a microcrystalline alpha alumina powder, and a material adapted to define pores in the product upon firing, drying and then firing the mixture to yield a grinding tool with from about 5 to about 65 volume % of voids within its structure.
A process for the production of a grinding wheel which comprises providing an open-celled polymeric foam preform in the shape of a disc of the approximate dimensions of the desired wheel, infiltrating the foam with an aqueous dispersion comprising sub-micron sized boehmite particles and particles of microcrystalline alpha alumina, said dispersion having a solids content of from 30 to 60 wt. %, such that the dispersion is deposited on the cell walls of the preform and, at least partially, fills the voids in the preform, drying the filled preform to remove the water and then firing the infiltrated preform to convert the boehmite to alpha alumina and to burn out the polymer of the preform to leave a wheel blank with a volume % voids of from about 5 to about 65.
A process for the production of a grinding wheel from a mixture comprising a sol or gel of an alpha alumina precursor and a pore forming material, forming the mixture into the shape of the desired wheel, drying the shaped mixture, then firing to convert to alpha alumina and to form a porous structure with from about 30 to about 60% by volume of voids.
Dependencies are inferred from the claim text.