Process for producing ceramic fine particles, and ceramic fine particle producing apparatus used therein
View Patent ↗Provided are a ceramic-fine-particle producing process making it possible to produce, with ease, ceramic fine particles which have a spherical shape close to a complete round and an excellent mono-dispersibility, and are made only of a solid component of a simple ceramic material without making a fine channel structure complicated, and an apparatus used therein for producing ceramic fine particles. The process includes the step (S 100 ) of feeding a dispersion phase made of an aqueous liquid containing a gelling agent to act upon cooling and a ceramic material into a continuous phase made of an oily liquid containing a surfactant, thereby producing fine droplets; the step (S 110 ) of collecting and cooling the produced fine droplets; the step (S 120 ) of washing the cooled fine droplets; the step (S 130 ) of drying the washed fine droplets; and the step (S 140 ) of firing the dried fine droplets.
1. A process for producing ceramic fine particles, the process comprising:
supplying a continuous phase and a dispersion phase into a fine channel of a fine channel structure such that the dispersion phase is fed into the continuous phase in a junction of the fine channel structure where the continuous phase and the dispersion phase are combined with each other, whereby the dispersion phase is continuously sheared so as to produce fine droplets,
wherein the dispersion phase comprises an aqueous liquid containing a gelling agent to act upon cooling and a ceramic material and the continuous phase comprises an oily liquid containing a surfactant;
a step of collecting the produced fine droplets, and cooling the droplets;
a step of washing the cooled fine droplets;
a step of coating the fine droplets with isoparaffin;
a step of drying the washed fine droplets; and
a step of firing the dried fine droplets.
2. The process for producing ceramic fine particles according to claim 1 , wherein the gelling agent is agar.
3. The process for producing ceramic fine particles according to claim 2 , wherein the production of the fine droplets is performed in a heated environment.
4. The process for producing ceramic fine particles according to claim 1 , wherein the gelling agent is agar.
5. The process for producing ceramic fine particles according to claim 4 , wherein the production of the fine droplets is performed in a heated environment.
6. The process for producing ceramic fine particles according to claim 1 , wherein the continuous phase and the dispersion phase are separately supplied to the fine channel structure in the supplying step.
7. The process for producing ceramic fine particles according to claim 1 , wherein the step of cooling the droplets is carried out after the step of collecting the droplets.