Production of a sintered ceramic dielectric formed from a green sheet having a uniform microporous structure providing uniform dielectric properties and compressibility for lamination of stacked green sheets into a unitary laminate which may be provided with an internal pattern of electrical conductors extending therein. The structure is obtained by blending the ceramic particulate in a solution of a binder resin miscible in a solvent mixture which is formed from a volatile solvent for the binder resin and a less volatile solvent in which the resin is at most only slightly soluble.

The invention relates to a multilayer film, in particular for the films for the manufacture of passive electronic components, the multilayer film having a small and uniform layer thickness, an improved layer structure and the method of manufacturing said films being simpler. In accordance with the invention, a multilayer film is proposed which comprises a green ceramic substrate film, inner electrodes provided by screen printing and one or more levelling layers which are provided on the whole area accommodating the green ceramic substrate film and the inner electrodes by means of screen printing. The inner electrodes and the levelling layer(s) are successively provided on the green ceramic substrate film by screen printing.

A method of manufacturing an ink jet recording head. On one and the other surfaces of an ink supply plate, formed with a plurality of discrete ink supply ports and a corresponding number of discrete nozzle ports, a green sheet for a pressure chamber plate and a green sheet for an ink pool plate are laminated, respectively. The resulting lamination is then sintered. A vibration plate is subsequently adhered to the pressure chamber plate formed by the sintering step and a nozzle plate is adhered to the sintered pool plate.

A method of producing a sintered body by molding a mixture of a ceramic base powder, a sintering assistant powder and an organic binder and sintering the molded body in a non-oxidizing atmosphere is disclosed in which the ceramic base powder has such a particle size distribution that the amount of powder particles not greater than 1.0 .mu.m in size is not more than 15% by weight and the average particle diameter is not greater than 5 .mu.m. According to the method, therefore, sufficient passage of gas is secured in a degreasing step, resulting in an enhanced degreasing efficiency and exellent sintering properties. Where the sintering assistant powder has such a particle size distribution that the amount of powder particles not greater than 10 .mu.m in size is not more than 5% by weight, the amount of coarse powder is extremely small and, therefore, large voids are not formed. It is thus possible to produce easily a high-quality sintered body by controlling the respective particle size distributions of the powders.

Ceramic green sheets of controlled microporosity and method of making same have been provided. Controlled microporosity is achieved by including certain ionic species in the ceramic composition, particularly boron, phosphorus and copper oxide.