Abstract: Powdered substances are compressed by a process wherein the powdered substances are enclosed in a flexible receptacle, the receptacle is enclosed in a pressure vessel and the space between the wall of the receptacle and the wall of the pressure vessel is pressurized with compressed gas.

Abstract: A piston for diesel engines is made of a toughness-increasing aluminium alloy containing copper, nickel, silicon, magnesium, iron and manganese. The use of this material, which can conventionally be chill-cast, and by implying special dimensions, provides a piston which, despite its relatively light construction, provides the utmost security against cracking in the stressed regions, e.g. the piston boss or the combustion chamber recess.

Abstract: Powdered substances are compressed by a process wherein the powdered substances are enclosed in a flexible receptacle, the receptacle is enclosed in a pressure vessel and the space between the wall of the receptacle and the wall of the pressure vessel is pressurized with compressed gas.

Abstract: A heat-insulator consisting ofa) A finely distributed, powdery or fibrous substance,b) A microporous casing andc) A gas- and watertight, metal-free casing.The heat insulator is manufactured by optionally drying the powdery or fibrous substance, optionally bringing it into a microporous casing, optionally pressing it and then optionally drying it. The powdery substance is then brought with the microporous casing into a gas- and watertight, metal-free casing. This gas- and watertight casing is optionally evacuated and sealed.

Abstract: Composite casting process for making castings, consisting in particular of light metal alloys reinforced by fiber or foamed material inserts, in particular motor parts such as pistons, cylinders, cylinder heads and motor blocks of internal combustion engines. In this process, firstly, a preform reinforced by the fiber or foamed material inserts is made by embedding and the penetration of a fiber bundle or a foamed material body in molten matrix metal or by a molten matrix metal and subsequently solidifying it. Then, the preform is immersed in a molten metal bath and subsequently inserted into a casting mould for integrally casting or casting around the final casting.

Abstract: A preferably platelike form body for use as heat insulation, consisting of:a) a finely divided, powdery or fibrous material,b) a microporous casing andc) a gas and watertight casing.The form body is produced by optionally drying the powdery or fibrous material, optionally placing it into a microporous casing, optionally pressing it and then optionally drying it. Then, the powdery material is placed with the microporous casing into a gas and watertight casing. This gas and watertight casing is optionally evacuated and sealed.

Abstract: A shaped body, preferably plate-shaped, for use as heat insulation, formed of (a) a finely distributed, powdery or fibrous substance, (b) a microporous casing, and (c) a gastight and watertight, metal-free casing. The shaped body is produced by drying a powdery or fibrous substance if necessary, optionally placing it into a microporous casing, optionally pressing and then optionally drying. Thereafter, the powdery substance is placed with the microporous casing into a gastight and watertight, metal-free casing. This gastight and watertight casing is optionally evacuated and sealed. Furthermore, a shaped article, preferably plate-shaped, for use as heat insulation, produced from (a) a finely distributed, powdery or fibrous substance with a water absorption capacity of 4 to 50% by weight at 23.degree. C.

Abstract: A heat-insulator consisting ofa) A finely distributed, powdery or fibrous substanceb) A microporous casing andc) A gas- and watertight, metal-free casing.The heat insulator is manufactured by optionally the powdery or fibrous substance, optionally bringing it into a microporous casing, optionally pressing it and then optionally drying it. The powdery substance is then brought with the microporous casing into a gas- and watertight, metal-free casing. This gas- and watertight casing is optionally evacuated and sealed.

Abstract: The invention relates to a device for hardening the surface of workpieces of different lengths, having: two clamping heads and a rotary drive, for clamping and rotating the workpiece to be hardened; inductors for the electroinductive heating of the workpiece surface; and a quenching spray.The characterizing feature of the invention is that disposed on opposite sides of the workpiece with provision for displacement in relation to one another in the direction of the workpiece axis for adaptation to the particular workpiece length are two line inductors (1a, 1b), each having two parallel conductor portions (2a, 2b) and end portions (5, 6) which are bent at right angles and an end portion (6a, 6b) of each of which extends arcuately or polygonally, more particularly at right angles, over the workpiece (4).

Abstract: Titanium dioxide compacts are produced by intensively mixing pyrogenically produced titanium dioxide in the presence of deionized water with a wetting agent and/or with a base and/or optionally with a binder and/or optionally with an auxiliary deformation agent and/or optionally with a pore former, extruding the mass thus obtained at pressures between 5 and 100 bars to form shaped articles, drying the shaped articles at temperatures between 50.degree. and 120.degree. C. and subsequently calcining the shaped articles in the ambient air at temperatures of 400.degree. to 700.degree. C. for 1 to 5 hours.

Abstract: Zirconium-doped pseudoboehmite with the following properties: zirconium content of 0.5 to 10 mol % relative to Al water content of 20 to 35 weight percent total of the anionic impurities less than 0.5 weight percent. It is synthesized by a process wherein zirconium salt is added in calculated quantity to an aqueous aluminum sulfate solution, the resulting mixture is fed simultaneously with a sodium aluminate liquor into a water pool having a temperature of 50.degree. to 100.degree. C., thereby precipitating zirconium-doped alumina gel while a pH of 3.5 to 8 is maintained, the pH of the suspension is adjusted after addition of the aluminum sulfate solution to 8.5 to 10.5 by further addition of sodium aluminate liquor, the suspension is digested if necessary at the pH of 8.5 to 10.5 and the temperature of 50.degree. to 100.degree. C. for a period of up to 24 hours, the formed pseudoboehmite crystals are filtered off, the filter cake is redispersed with water and the suspension is sprayed-dried.

Abstract: X-ray amorphous, aluminum oxide which exhibits a specific surface area (BET) according to DIN 66 131 of >10 m.sup.2 /g, an average particle size of .gtoreq.0.1 .mu.m and a water content of >10%. The X-ray amorphous aluminum oxide can be produced by reacting water vapor and vaporous aluminum trichloride in a molar ratio of 1.5 to 10:1, preferably 7.+-.1:1=H.sub.2 O:alCl.sub.3 at a temperature of 200.degree. to 1000.degree. C., preferably 600.degree..+-.50.degree. C. and at a dwell time of >1 sec., preferably 3.5.+-.1 sec. and a partial vacuum of 100.+-.10 mm H.sub.2 O column. By means of calcination thereof an aluminum oxide can be obtained which consists of .gtoreq.90% by weight of .alpha.-aluminum oxide and exhibits a specific surface area (BET) according to DIN 66 131 of >5 m.sup.2 /g and an average particle size of .gtoreq.0.1 .mu.m.

Abstract: Zirconium-doped pseudoboehmite with the following properties: zirconium content of 0.5 to 10 mol % relative to Al water content of 20 to 35 weight percent total of the anionic impurities less than 0.5 weight percent. It is synthesized by a process wherein zirconium salt is added in calculated quantity to an aqueous aluminum sulfate solution, the resulting mixture is fed simultaneously with a sodium aluminate liquor into a water pool having a temperature of 50.degree. to 100.degree. C., thereby precipitating zirconium-doped alumina gel while a pH of 3.5 to 8 is maintained, the pH of the suspension is adjusted after addition of the aluminum sulfate solution to 8.5 to 10.5 by further addition of sodium aluminate liquor, the suspension is digested if necessary at the pH of 8.5 to 10.5 and the temperature of 50.degree. to 100.degree. C. for a period of up to 24 hours, the formed pseudoboehmite crystals are filtered off, the filter cake is redispersed with water and the suspension is sprayed-dried.

Abstract: A spherical, hydrophilic silica consisting of compact, massive, non-crystalline particles without inner pores with a particle size of 0.5 to 10 .mu.m, preferably 0.5 to 4 .mu.m and especially 1 to 3 .mu.m with a BET surface of <50 m.sup.2 /g, preferably of 1 to 10 m.sup.2 /g is prepared by heating water vapor and gaseous silicon tetrachloride separately to a temperature of 300.degree. to 400.degree. C., mixing them with each other in a molar ratio of 2:1 to 6.7:1 and reacting the mixture at a temperature of 600.degree. to 1200.degree. C.

Abstract: A driving coupling includes two pawls which are supported pivotally on an eccentric ring and which in a patternlike manner engage a longitudinal groove in the drive shaft. Each of two plates of a toggle-lever joint engages an arm extension of a respective pawl, the swivel axle of the toggle-lever joint being guided in a control groove of a swinging switching arm. When the pawls are engaged with a drive shaft groove, the toggle-lever joint is in an extended position which locks the pawls in position. For unlocking the pawls, the switching arm moves the toggle-lever joint into a catch opening between two guide rails. The pawls swing out and the drive shaft rotates without carrying along the pawls and the eccentric ring.

Abstract: There is prepared an aqueous suspension which in addition to water, consists of 2 to 50 weight % of a mixture of bentonite and inorganic fibers, with the portion of inorganic fiber being 1 to 30 weight % and the portion of bentonite being 1 to 30 weight % and wherein the total amount of solids does not exceed 50 weight %. With the suspension there is attained an improvement of the mechanical properties of thermal insulating molded objects which are employed for thermal insulation and which for example, contain pyrogenically produced silica as a filler by delivery of this suspension on the thermal insulating plate. The suspension can also be delivered on thermal insulating molded bodies on which there is pressed a fiber net or a fiber felt. After applying the suspension several thermal insulating molded bodies can be joined together where the coating formed consisting of bentonite and inorganic fibers acts as binder.

Abstract: There is prepared an aqueous suspension which in addition to water, consists of 2 to 50 weight % of a mixture of bentonite and inorganic fibers, with the portion of inorganic fiber being 1 to 30 weight % and the portion of bentonite being 1 to 30 weight % and wherein the total amount of solids does not exceed 50 weight %. With the suspension there is attained an improvement of the mechanical properties of thermal insulating molded objects which are employed for thermal insulation and which for example, contain pyrogenically produced silica as a filler by delivery of this suspension on the thermal insulating plate. The suspension can also be delivered on thermal insulating molded bodies on which there is pressed a fiber net or a fiber felt. After applying the suspension several thermal insulating molded bodies can be joined together where the coating formed consisting of bentonite and inorganic fibers acts as binder.

Abstract: An eccentric ring is rotatably supported between a drive shaft and a connecting rod. Two coupling keys are independently radially movably supported on the eccentric ring. The first key, during a coupling operation, is radially moved by an inner cam and is held in engagement with a groove in the shaft during a 180.degree. rotation thereof. The second key can move radially between positions respectively engaging the groove and an outer cam on an indexing ring and, for a holding-still phase, is moved outwardly by an edge of the shaft groove into an enlargement in the outer cam. Through the second key being in the enlargement and through a cam on the indexing ring which engages a gap between two noses on the eccentric ring, the eccentric ring is held against rotation. When the first key is moved inwardly, an edge of the groove engages it and thus rotates the eccentric ring and the second key, which slides on a ramp of the enlargement and is moved into the shaft groove.

Abstract: A normal position of a shifting wedge of a lifting unit for a rotational dobby is achieved by a movable arrangement of the recess in a locking block which receives the wedge and has rigid side flanks. The entire locking block is, against the urging of a spring, supported for movement translatorically and/or swingably within certain limits, wherein the center axis of the recess moves only insignificantly out of its normal radial orientation.

Abstract: There is prepared an aqueous suspension which in addition to water, consists of 2 to 50 weight % of a mixture of bentonite and inorganic fibers, with the portion of inorganic fiber being 1 to 30 weight % and the portion of bentonite being 1 to 30 weight % and wherein the total amount of solids does not exceed 50 weight %. With the suspension there is attained an improvement of the mechanical properties of thermal insulating molded objects which are employed for thermal insulation and which for example, contain pyrogenically produced silica as a filler by delivery of this suspension on the thermal insulating plate. The suspension can also be delivered on thermal insulating molded bodies on which there is pressed a fiber net or a fiber felt. After applying the suspension several thermal insulating molded bodies can be joined together where the coating formed consisting of bentonite and inorganic fibers acts as binder.