Method for producing ceramics sintered article and molding method and molding apparatus to be used therefor
AssigneeNGK Insulators, Ltd.
InventorsTadaaki Matsuhisa, Shigeki Kato, Hiroyuki Iwasaki
Life of this patent
Estimating the term…
Abstract
A ceramics shaped article having a large wall-thickness and having a complicated shape, which can not be monolithically produced by a conventional molding, can be easily produced through a monolithical molding by the use of a ceramic batch containing water as a plasticizing medium and a small amount of an organic binder as a plasticizer. The ceramic shaped article can be fired into a ceramic sintered article in high dimensional accuracy and yield.
Claims17
A method of producing ceramic articles sequentially comprising the steps of:
- (a) injection molding a kneaded material containing ceramic powder, sintering aids, water and organic binder to provide a molded body, said ceramic powder having a particle size within a range defined by the following formula:
- ##EQU3## (b) drying the molded body;
- (c) isostatically pressing the entire dried, molded body under hydrostatic pressure;
- (d) removing the organic binder from the molded body;
- and
- (e) sintering the molded body.
A method for producing a ceramic sintered article, comprising the steps of:
- providing a ceramic powder having a particle size satisfying the following equation:
- ##EQU4## forming a mixture of said ceramic powder with a sintering aid, water and an organic binder;
- deaerating the mixture by means of a vacuum kneading machine to produce a ceramic batch;
- injection molding the ceramic batch into an injection molding die to form a green shaped article;
- removing the water and organic binder from the green shaped article;
- and
- firing the shaped article to form said ceramic sintered article.
Dependencies are inferred from the claim text.