NOVEL CERAMIC FORMING METHODS WITH A REACTIVE ORGANIC BINDER

Abstract

Most ceramics are produced as particle assemblages made dense by firing. Since the fine ceramic particles usually possess poor formability, the addition of considerable amount of organic binders in the forming stage is unavoidable at the present time. However, the pyrolysis of the organic binders can result in the emission of carbon dioxide or other hydrocarbon gases. A reduction in the emission gases is one aim of current ceramics industry. A novel ceramic-forming process was developed that involves immobilizing reactive molecules on the surfaces of the ceramic particles, which on subsequent external stimuli, form bridges that bind the entire particle assembly together. The chemical forces involved produce strong bonds, resulting in a reduction in the amount of organic binder that is required to maintain the shape of the ceramic green body. The obtained green body with covalent bondings is also available for debinding methods not relaying on pyrolysis. The methods will help to decrease emission gases produced from pyrolysis of the organic additives.