Abstract: A firing setter, which is useful for a heat treatment or firing step upon production of ceramic-based electronic device components or production of metal-based components obtained by injection molding, is provided with plural trough-holes and has an alumina content of at least 70 wt. %. Each of the through-holes is linear with substantially the same inner diameter along a length thereof and has an inner diameter of from 0.3 to 1 mm. A process for producing the firing setter is also disclosed.

Abstract: A firing setter, which is useful for a heat treatment or firing step upon production of ceramic-based electronic device components or production of metal-based components obtained by injection molding, is provided with plural trough-holes and has an alumina content of at least 70 wt. %. Each of the through-holes is linear with substantially the same inner diameter along a length thereof and has an inner diameter of from 0.3 to 1 mm. A process for producing the firing setter is also disclosed.

Abstract: A water-permeable ceramic material is made of a porcelain particulate material as the principle component, one or more primary binders selected from starch adhesives, organic binders, clay and water glass, and one or more secondary binders selected from frit, glaze and glass powder. The principal component is selected from one or more porcelain materials including a fired mixture of pottery stone, kaolin and feldspar; porcelain wastes, and other porcelain materials such as road-surfacing porcelain color aggregates, and is classified to have a particles are of relatively high bulk density and very low porosity. The mix is shaped by a pressing machine to a tabular or tubular form suited to the specific use of the final product. The pressure of the pressing machine is adjusted to an amount of 30-200 kg/cm.sup.2. After shaping, the resultant compact is sintered at a temperature up to the melting point of the porcelain particles to produce the ceramic material.

Abstract: An alumina silica sintered ceramic that is produced by the normal sintering method and which has bending strength of at least 300 MPa at room temperature and at least 400 MPa at an elevated temperature, for example, 1,300.degree. C. is disclosed.This sintered ceramic is produced by a process comprising the following steps: providing a chiefly amorphous starting powder that consists of 62-73 wt % Al.sub.2 O.sub.3 and correspondingly 38-27 wt % SiO.sub.2 ; calcining this starting powder to make a calcined product that is chiefly composed of a crystalline phase and which contains oxides of an alkali metal and an alkaline earth metal in a total amount of no more than 1,500 ppm; pressing the ground particles of the calcined product into a compact; and sintering the compact at 1,500.degree.-1,750.degree. C. and at atmospheric pressure.

Abstract: A basic brick composition containing spinel clinker and magnesia clinker wherein pulverized iron oxide by additional weight mixing ratio is mixed or special magnesia clinker is substituted for magnesia clinker instead of addition of iron oxide.