Abstract: A heat-resistant casing for an internal combustion engine comprises an outer wall member made of an aluminum alloy by casting and an inner wall member made of ceramic and embedded in the outer wall member at the time of casting of the outer wall member. A coolant jacket is formed in the outer wall member and is communicated with a source of cooling medium so that cooling medium circulates through the coolant jacket.

Abstract: A bearing includes an inner ring made of ceramics. A shaft is made of metal and fitted in the inner ring. The ceramics has a tensile strength equal to or larger than 50 Kg/mm.sup.2, and the ceramics and the metal are determined so as to satisfy the relation of .beta..sub.2 -.beta..sub.1 .ltoreq.6.times.10.sup.-6 /.degree.C. where .beta..sub.1 is a coefficient of linear expansion of the ceramics and .beta..sub.2 is a coefficient of linear expansion of the metal.

Abstract: A piston head has a cavity and a central projection projecting into the cavity. A ceramic insert is cast in a piston body so as to cover a piston head portion defining the cavity except the central projection-and-its adjacent piston head portion. The ceramic insert has an edge defining a hole through which the central projection projects into the ceramic insert. In one form of the embodiment, a clearance is provided between the edge of the ceramic insert and the central projection-and-its adjacent piston head portion.

Abstract: The invention relates to a cylinder head for an internal combustion engine in which each combustion chamber has a prechamber. A cast metal body of the cylinder head has recesses each of which provides a prechamber, and a hollow and, for example, bell-shaped member of an adequately porous ceramics is cast-inserted in the inner surface defining each recess. Use is made of a ceramics low in thermal expansion coefficient and heat conductivity, such as aluminum titanate or cordierite, and the porosity of the ceramics is limited within the range of from 5 to 20%. The cast-inserted ceramics member can easily be machine-finished and, without any extra treatment, has sufficient strength and durability.

Abstract: A ceramic rocker arm is hollow and formed with two openings for providing communication between an inner hollow place and the outside of the rocker arm. The inner hollow place is communicated with a source of lubricant. The openings are located adjacent surface portions of the rocker arm contacting a cam and a valve so that lubricant is supplied through the inner hollow place and the openings to the joints between the rocker arm and the respective cam and valve. A filler of a synthetic resinous material is filled in the hollow ceramic rocker arm so as to prevent dispersion of small pieces upon breakage of the rocker arm.

Abstract: The invention relates to a cylinder head for an internal combustion engine in which each combustion chamber has a prechamber. A cast metal body of the cylinder head has recesses each of which provides a prechamber, and a hollow and, for example, bell-shaped member of a porous ceramics is cast-inserted in the inner surface defining each recess. Use is made of a ceramics low in thermal expansion coefficient and heat conductivity, such as aluminum titanate or cordierite, and the porosity of the ceramics is 5 to 50%. Because of its porousness the cast-inserted ceramics member is easily machine-finished. After that, for enhancement of strength and durability, the cast-inserted member of the porous ceramics is impregnated with an inorganic refractory material by using either a solution of, for example, sodium silicate or aluminum phosphate or an aqueous suspension of a ceramics powder, or a mixture of the solution and the suspension.

Abstract: A method of forming a complex body of a sintered ceramic material and a metal. A through-hole is provided in the sintered ceramic material before it is cast-embedded in the metal. The through-hole provides for the release of gas to prevent the formation of a cavity between the sintered ceramic material and the metal.

Abstract: A heat-insulated port liner arrangement for a device composed of a cast metal which is molded around the arrangement and includes a tubular port liner composed of a material including a ceramic, a first covering layer disposed on the outer surface of the liner and composed of a material including refractory fibers, and a second covering layer disposed on the outer surface of the first covering layer and composed of a material including a metal having a melting point not lower than the melting point of the cast metal.

Abstract: A method for producing a cylinder head having a tubular exhaust port liner made of a ceramic material is disclosed. The method comprises providing a covering layer of refractory fibers around the outer circumference of the exhaust port liner, applying a metal cap over each end of the covered exhaust port liner and setting the covered exhaust port liner into a mold. A cylinder head then is cast around the exhaust port liner so that the portions of the metal caps contacting the cylinder head are fused to the cylinder head. The metal caps are bored out to open up the exhaust port after predetermined treatments are performed on the cylinder head.

Abstract: A bent honeycomb pipe includes an outer pipe section bent at a predetermined curvature, a bent central pipe section coaxial with the outer pipe section and a bent honeycomb-shaped section interposed between the outer and central pipe-sections, all three sections being simultaneously coextruded to form a single-piece construction.

Abstract: A method of making a ceramic shaped article from an inorganic raw material powder by extrusion molding is disclosed. The method comprises the steps of kneading an inorganic raw material powder with a plasticizer to obtain a kneaded body which is then molded by extrusion into a fluid having a high humidity to obtain a ceramic shaped article having no deformation and strain. The plasticizer is selected from the group consisting of mono-liquid type resin which is a water insoluble synthetic resin dissolved in a water soluble solvent and a hydraulic setting resin mainly consisting of polyurethane isocyanate prepolymer.

Abstract: Apparatus for manufacturing a tubular honeycomb with adiabatic passages 107 formed integrally on its outer wall includes a first body 2 having a plurality of honeycomb shaped through holes 6, 7, 10 and a flange 3 secured to an extrusion pipe 1 carrying a plastic material under pressure, and a truncated conical portion 5 projecting coaxially from the flange. A second cylindrical body 12 has a truncated conical through hole disposed coaxially around the conical portion of the first body to define therebetween a first annular space 21 communicating with the honeycomb, and comprises truncated conical projection 15 alternately provided with slits 16 and holes 17 communicating with the first annular space. The first and second bodies are secured together by a stopper ring having a truncated conical through hole communicating with the slits and holes in the second body and disposed coaxially therearound to define therebetween a second annular space 22.

Abstract: A method of firing a formed ceramic body containing organic components comprising the steps of covering a formed raw ceramic body containing organic components as its plasticizer and bonding agent, with a metal foil capable of being oxidized at a high temperature, and firing such a metal-foil covered ceramic body. The method is particularly useful for manufacturing a honeycomb-shaped catalyzer carrier made of ceramic having a number of holes for a device for purifying exhaust gases.