Abstract: A thermal insulation lining (1) in the exhaust duct (4) of a cylinder head (5) consists of a sintered compact (2) of ceramic material having an envelope containing or consisting of inorganic fibers.

Abstract: In a cylinder head (1) of a piston engine, a thermal insulation component having openings for the accommodation of valve seats, spark plugs, and injection nozzles consists of a circular aluminum titanate plate (2) which is shrink-fitted into a planar circular ring of zirconium oxide (12) gripped or shrink-fitted in the cylinder head. The circular plate (2) of aluminum titanate forms the greatest part of the cylinder head bottom (9).

Abstract: A piston ring (1) made of ceramic materials for an internal combustion engine comprising a body made by sintering of partially stabilized zirconium oxide (PSZ) which has a porosity <3% and, rolling surface (4) of the piston ring having a centerline average roughness R.sub.a of 0.03 to 0.1 .mu.m. Due to its homogeneous structure, the inventive piston ring avoids the problems of the ceramic/metal bond of known piston rings and, even under high thermal load, does not suffer from thermally induced destruction or welding of the piston ring groove.

Abstract: In a pre-combustion or turbulence chamber for an internal combustion engine, an inner molded body, defining an inner chamber, is formed of a material having a thermal conductivity of at least 12 W/(m.multidot.K). An outer body is secured to the outer surface of the inner body by shrinking or glueing. The outer body is formed of a thermally insulating ceramic material having a thermal conductivity of less than 10 W/(m.multidot.K). Due to the low thermal conductivity of the outer molded body, the inner molded body is insulated against heat losses. The higher thermal conductivity of the inner molded body has the effect that, in the interior of the pre-combustion or turbulence chamber, the point at which the cold fuel jet impinges during the injection process is only slightly cooled.

Abstract: In a cylinder head of a piston engine, the surface of the cylinder head facing the combustion chamber is covered by a plate having openings for valves, spark plugs or injection nozzles. The plate consists of mullite containing 2 to 30% by volume of zirconium oxide and/or hafnium oxide embedded therein, plus 0 to 3 mole-percent of oxides of magnesium, calcium or yttrium, with respect to the zirconium and/or hafnium oxide, and of no more than 0.5%, by weight, of other oxidic impurities.

Abstract: A method for the coating of a raw paper or cardboard substrate wherein the substrate is prepared having a pH of less than about 6.5, and a coating is applied thereto composed of an aqueous dispersion of a plastic and an inorganic pigment, the coating having a pH of more than about 6.5 wherein the particles of the plastic in the dispersion have a non-cation-active charge and wherein the coating also contains a material which does not affect the preparation or storage stability of the coating, but which in the pH range below about 6.5 becomes highly cation-active, and then drying the thus applied coating. Using this method, the coating solidifies at the time of contact of the coating and the paper surface thereby minimizing penetration of the coating into the paper. As a result, improved coated papers are obtained.

Abstract: Method for the production of a polycrystalline shaped body of silicon carbide of a density of at least 98% of the theoretical density of silicon carbide, prepared through pressureless sintering at temperatures from 1,900 to 2,200 C. from at least 97 weight % of .alpha.-silicon carbide and/or .beta.-silicon carbide under addition of up to 3 weight % of boron, characterized by the fact that the shaped body is prepared without any carbon additions to the batch and is pressureless sintered in a carbon containing protective gas atmosphere.

Abstract: A transparent, shrinkable film composed of at least one layer which is a mixture of85-10 weight percent of a linear polyamide, linear copolyamide, or an elastomeric component, and15-90 weight percent of a partially aromatic polyamide or partially aromatic copolyamide.The films of the present invention can be shrunken at economically feasible temperatures, shrink in such a way so as not to damage the goods encased therein and also possess desirable transparency and gas permeability properties.

Abstract: Polycrystalline shaped body of a density of at least 98% of the theoretical density of silicon carbide, consisting of at least 92 weight % of .alpha.-silicon carbide and/or .beta.-silicon carbide, which is present in the form of a homogeneous texture with grains of maximal 10 .mu.m, and is characterized by the fact that, besides a content of up to 3 weight % of boron, a share of about 0.5 to 5 weight % of a metal or rare earth element that acts reducing or mixtures thereof is present, and the body shows a transverse rupture strength (determined by the four-point method) of at least 500 N/mm.sup.2 up to 1,400 C and is essentially free of free carbon.A method for the production of shaped bodies through the pressureless sintering of the silicon carbide starting material, characterized by the fact that about 0.

Abstract: Apparatus for processing paper wherein a pair of endless curved wire devices operate to pass therebetween a sheet material to be treated for a dewatering operation or the like. A support structure in the form of individual support segments made from sintered oxide ceramics are arranged to extend over the width of the apparatus and are in contact with one another, with a plurality of the segments being arranged consecutively in the direction of the course of the wire devices, the segments having a maximum linear expanse of 700 mm per segment and having junction areas between consecutively arranged segments defining a gap for feeding cooling water to the guide wire devices.

Abstract: A cutting tool, such as a turning tool, includes a clamping holder with a recess in one of its surfaces, a cutting bit insertable into the recess, and a clamping shoe secured to the clamping holder by a clamping bolt. The clamping shoe has a projecting member engageable within a depression located in the surface of the cutting bit for securing the cutting bit in the recess of the clamping holder. The depression is defined in the surface of the cutting bit by a closed line formed in part by convexly curved first lines and by second lines interconnecting the ends of the first lines. The depression, as viewed in plan, has an oblong or star-shaped configuration. The lines defining such configuration can be convex, concave or rectilinear. The surface of the depression within the closed line is formed by a radius centered at points located outwardly from the surface of the cutting bit containing the depression. Accordingly, the length of the radius is greater than the depth of the depression.

Abstract: A cutting tool, such as a turning tool, includes a clamping holder on which a clamping shoe is secured. The clamping shoe has a curved surface projecting member adjacent one end for securing a cutting bit in a recess in a first surface on the clamping holder. The projecting member seats within a shaped recess in the cutting bit. Guide cams are located adjacent the opposite end of the clamping shoe and contact a second surface on the clamping holder inclined relative to the first surface. A clamping bolt located between the projecting member and the guide cams secures the clamping shoe to the clamping holder. A spring encircling the bolt biases the clamping shoe outwardly from the clamping holder. A pin member is mounted in the second surface of the clamping holder and engages between the guide cams as protection against turning the clamping shoe about the axis of the clamping bolt.

Abstract: Mandibular implant of ceramic material in which a bottom portion for anchoring in the mandible has a substantially conical helix shape rounded off at the end. An upper portion has a concave section for receiving an epithelial sleeve by the concave section and an opening to accept a denture support. There are provided at least one annular expansion and at least two annular notches adjacent the upper portion and the bottom portion. The annular expansion has a diameter which is shorter than the diameter of the crest of the thread at the uppermost turn on the bottom portion of the implant.

Abstract: To control the operation of a machine tool, which has a tool bit cutting a workpiece, the temperature of a measurement spot or area, such as on the cut surface of the workpiece, is checked by an optical element which collects infra-red radiation and focuses it on a thermal sensor. The temperature read by the thermal sensor is registered in an evaluating device which generates a signal when a predetermined temperature condition is reached for discontinuing operation of the machine tool.

Abstract: A machine component is disclosed composed of 3.0 to 25 weight percent of zirconium oxide and/or hafnium oxide which are present in the interior of the machine component at room temperature predominantly in the metastable tetragonal modification and at the surface of the machine component in the monoclinic modification, said machine component having a profile bearing ratio of about 10 to 40% and an center line average surface roughness R.sub.a in the contact area of less than 0.3 .mu.m. The machine components of the present invention are leakproof, exhibit good thermal shock durability and exhibit good frictional engagement characteristics for long periods of time.

Abstract: A valve assembly for controlling fluid flow, either of a single fluid or for mixing two different fluids such as hot and cold water, operates with a pair of interengaging valve plates having inlet orifices and outlet orifices defined therethrough actuated relative to each other to align the orifices to effect fluid flow. A chamber is defined on one side of one of the plates and a silencer disk is arranged within the chamber with spring means being provided to urge the silencer disk against one of the plates to effect closure of at least the inlet opening of the valve assembly. In operation, inlet fluid pressure operates against the force of the spring means to lift the silencer disk from the one valve plate to enable flow through the valve assembly.

Abstract: The shaft of a glandless pump which is made of sintered oxide ceramics in order to resist chemical attack is formed with a projection upon which there is mounted a metal sleeve having a bottom in order to enable a tool, such as a screwdriver, to be applied against the shaft for rotating the shaft when unblocking the pump without causing damage to the ceramic material of the shaft.

Abstract: Flotation apparatus for de-inking of pulp suspension in a flotation cell with injectors for feeding the pulp suspension into the cell and for aerating the pulp suspension. The injectors are equipped with wide slot nozzles through which the suspension flows having a ratio of cross-sectional area to periphery of between 1.5 mm and 4.0 mm. A mixing chamber receiving pulp suspension flow from the wide slot nozzles is provided having a cross-sectional area which is between 1.3 to 1.7 times the cross-sectional area of the wide slot nozzles.

Abstract: A sintered cutting tip composed of70-90 weight percent of aluminum oxide;10-30 weight percent of zirconium oxide;0.1-0.5 weight percent of magnesium oxide,and less than 0.6 weight percent of impurities, having a porosity of less than 2%,an average particle size of less than 1.7 .mu.m, and a fracture toughness K.sub.Ic at room temperature of at least 190 N/mm.sup.3 /.sup.2 and of at least 140 N/mm.sup.3 /.sup.2 at 1000.degree. C.A method for manufacturing the cutting tip and its use are disclosed. Cutting tips in accordance with the present invention possess superior performance in terms of longer cutting life and are particularly suitable for use with case-hardened, quenched and tempered steels at high cutting speeds.

Abstract: A pulp suspension of waste paper which is laden with air bubbles is introduced into a flotation cell. Fine air bubbles rise through the pulp suspension toward the top. Printing ink and other impurities are deposited on the bubbles which form a foam layer on the surface of the pulp suspension. The foam which is laden with impurities is drawn off from the surface. The fibers which have been subjected to preliminary purification in this manner sink downwardly. For reducing the number of cells connected in series to fewer than a third, while obtaining the same degree of whiteness, the fibers which were subjected to preliminary purification are drawn off and are once again supplied to the flotation cell in the form of an air-laden pulp suspension. Alternatively, instead of the air-laden pulp suspension, a water-air suspension can be injected. The air bubbles which are thus introduced once again rise toward the top and traverse the sinking fibers in a counterflow.