Production process for spherical ceramic granules which includes pulverizing a dried product of a ceramic material; calcinating the pulverized product at a temperature of about 300 to 900° C.; rotating the calcinated granules to make spherical granules; and firing the spherical granules. The spherical ceramic granules have no corner or sharp edge and projection, and thus show a high fluidity property and excellent operability.

Process for the production of spherical ceramic granules

A method for manufacturing a photomask material includes delivering a powder containing silicon dioxide into a plasma to produce silica particles and depositing the silica particles on a deposition surface to form glass.

Method and feedstock for making photomask material

The present invention involves new compositions comprising an organic pigment or dye complexed with a support via a coordinate covalent bond. The support is characterized has having a Lewis acid or Lewis acid substitute.

Organic/Inorganic Lewis Acid Composite Materials

The present invention includes a paint or coating composition comprising an organic pigment or dye complexed to the surface of a layered or fibrous inorganic clay. A wide variety of paint colors can be obtained by varying the pH during the preparation as well as by varying the synthesis conditions and changing particle size of the clay.

Color compositions and methods of manufacture

A method of making fused silica includes generating a plasma, delivering reactants comprising a silica precursor into the plasma to produce silica particles, and depositing the silica particles on a deposition surface to form glass.

Method for making photomask material by plasma induction

A device for producing spherical silica grains includes a cylinder having its axis inclined to the horizontal and an inside wall made from a material that is significantly softer than silica. The cylinder has an entry chute for non-spherical silica grains and an exit chute for spherical cylinder grains. A rotary member is rotated at high speed by a drive shaft having its axis coincident with the axis of the cylinder. The rotary member includes at least one paddle vertically aligned with the entry chute so that silica grains entering via the entry chute are thrown by the paddle against the inside wall of the cylinder and follow a path most of which is against the wall before leaving via the exit chute.

Apparatus for manufacturing silica powder with spherical grains

A method for producing spherical silica grains using a cylinder having its axis inclined to the horizontal and having an inside wall made from a material that is significantly softer than silica. The cylinder has an entry chute for non-spherical silica grains and an exit chute for spherical cylinder grains. According to the method, a rotary member is rotated at high speed by a drive shaft having its axis coincident with the axis of the cylinder. The rotary member includes at least one paddle vertically aligned with the entry chute so that silica grains entering via the entry chute are thrown by the paddle against the inside wall of the cylinder and follow a path most of which is against the wall before leaving via the exit chute. As a result, the silica graining have a spherical shape.

Method of manufacturing silica powder with spherical grains

Procede et dispositif de spheroidisation de granules de silice

Process comprises imparting high speed to the granules which keep them in contact with a wall (28) of a hardness substantially lower than that of the silica so that their surfaces are abraded into a spheroid shape as they roll over the wall. The appts. comprises a cylinder (12) with its axis inclined relative to the horizontal and having an inner wall (28) of a material with a hardness substantially lower than that of silica. The cylinder has an inlet (34) for non-spheroid silica granules at the top, and an outlet (26) for spherical granules at the bottom. It contains a rotor (14) which is turned at high speed by a drive shaft (16) with its axis in line with the cylinder, and has one or more vanes (18,20) which project the granules against the cylinder's inner surface. The latter is of a plastic material e.g. a polyamide resin.

Jean-Florent Campion

Papers

Apparatus for manufacturing silica powder with spherical grains

Method of manufacturing silica powder with spherical grains

Procede et dispositif de spheroidisation de granules de silice

Process and device to prepare spherical granules of silica