Method of manufacturing aqueous ceramic suspensions and the use of said suspensions
First Claim
1. A method of manufacturing aqueous suspensions of deagglomerated finely powdered solid particles of barium titanate in a manner to prevent reagglomeration, said method comprising the steps of(a) forming an aqueous suspension of solid particles of finely powdered barium titanate and dispersing agents, and(b) carrying out at least one of the following sub-steps to prevent reagglomeration of said solid particles of finely powdered barium titanate for a given period of time:
- (i) washing said solid particles at least once in water before carrying out step (a),(ii) adding to said aqueous suspension anionic compounds of at least one of sulfates, carbonates, iodates, chromates, oxalates, citrates and tartrates,(iii) providing said aqueous suspension in a gaseous atmosphere free of CO2,(iv) providing said aqueous suspension at a temperature of at most 20°
C. and(v) adding additional dispersing agents to said aqueous suspension at least before reagglomeration of said solid particles begins.
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Abstract
A method describing the manufacture and use of aqueous suspensions comprising fine-powdered ceramic solid particles, dispersing agents and, if necessary, binders, in which method the manufacture of the suspensions includes the following process steps which are carried out separately or in combination:
washing the solid particles in water before preparing the suspension;
adding anionic compounds, in the form of sulphates, carbonates, iodates, chromates, oxalates, citrates and/or tartrates;
manufacturing the suspensions and/or storing the finished suspensions in a CO2 -free gaseous atmosphere;
manufacturing the suspensions and storing the finished suspensions at a temperature below 20° C., preferably below 15° C.;
adding additional dispersing agents to the suspension at a time when reagglomeration of the solid particles in the suspension has not yet started or just started.
41 Citations
26 Claims
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1. A method of manufacturing aqueous suspensions of deagglomerated finely powdered solid particles of barium titanate in a manner to prevent reagglomeration, said method comprising the steps of
(a) forming an aqueous suspension of solid particles of finely powdered barium titanate and dispersing agents, and (b) carrying out at least one of the following sub-steps to prevent reagglomeration of said solid particles of finely powdered barium titanate for a given period of time: -
(i) washing said solid particles at least once in water before carrying out step (a), (ii) adding to said aqueous suspension anionic compounds of at least one of sulfates, carbonates, iodates, chromates, oxalates, citrates and tartrates, (iii) providing said aqueous suspension in a gaseous atmosphere free of CO2, (iv) providing said aqueous suspension at a temperature of at most 20°
C. and(v) adding additional dispersing agents to said aqueous suspension at least before reagglomeration of said solid particles begins. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification