Abstract: A silicon carbide whisker production apparatus manufactured by placing a plurality of lidded reaction vessels in the longitudinal direction of an Acheson furnace at intervals, packing graphite grains in the gaps between the adjacent reaction vessels and around the reaction vessels along the longitudinal direction of the furnace starting with the furnace-side ends of terminal electrodes to form a surrounding heating zone, and packing a heat insulating packing around the surrounding heating zone.

Abstract: A process for producing a titanium carbide whisker, comprising the steps of: mixing 100 parts by weight of a titanium source comprising titanium dioxide and/or an alkali metal titanate with 50 to 200 parts by weight of a carbon source and 1 to 30 parts by weight of a transition metal chloride; and heating the resultant mixture at 1300.degree. to 1700.degree. C. in an inert gas atmosphere.

Abstract: An apparatus for producing carbon black comprises a reaction chamber which consists of a tapered throat and a downstream extension of the throat having the same diameter as that of the narrowest portion of the throat and provided with a plurality of ribs on its inner wall which define a plurality of flits parallel to the axis of the reaction chamber. The reaction chamber is equipped, on the upstream side of the extension, with means for introducing the feedstock oil perpendicularly to the axis of the chamber.

Abstract: A silicon carbide reinforced composite material comrpising a base material and, dispersed therein, a reinforcement comprising a silicon carbide whisker and an elliptical silicon carbide particle.

Abstract: A rubber composition comprising 100 parts by weight of a rubber ingredient compounded with 35-100 parts of a carbon black, said carbon black having a nitrogen adsorption specific surface area (N.sub.2 SA) of 60-160 m.sup.2 g and a dibutyl phthalate adsorption number (DBP) of 90-150 ml/100 g, and the intraaggregate mode diameter (Dp mode diameter) of the carbon black satisfying the following formula:Dp mode diameter .gtoreq.75.2.times.(DBP/N.sub.2 SA)+8.0 wherein the Dp mode diameter refers to a mode diameter at the maximum frequency in the pore diameter distribution of carbon black particles measured by means of a differential scanning calorimeter (DSC).

Abstract: A carbon black of the category of hard carbon blacks having a nitrogen adsorption specific surface area (N.sub.2 SA) of 120 to 165 m.sup.2 /g and a DBP absorption number of 120 ml/100 g or more and satisfying requirements respectively represented by the following formulae (1) and (2):Dst.ltoreq.(4.35.times.dn)-10.0 (1) ##EQU1## In the formulae (1) and (2), dn is the arithmetic average diameter (nm) measured by electron microscopy, .DELTA.Dst (nm) is the difference between two Stokes diameters each obtained in a frequency of 50% of the maximum frequency in a distribution curve of the aggregate Stokes diameter, Dst (nm) is the Stokes diameter of the maximum frequency in the distribution curve of the aggregate Stokes diameter, N.sub.2 SA is the nitrogen adsorption specific surface area (m.sup.2 /g) and IA is the iodine adsorption number (mg/g).

Abstract: A rubber composition comprising 100 parts by weight of a rubber component which consists of a natural rubber alone or a blend of a natural rubber with a dienic synthetic rubber and from 35 to 100 parts by weight of a carbon black compounded into the rubber. The carbon black has a nitrogen adsorption specific surface area (N.sub.2 SA) of 100 to 160 m.sup.2 /g and also a true specific gravity and a mode diameter of intraaggregate pore (Dp) which satisfy, respectively, the relations1 true specific gravity.ltoreq.1.8379-0.0006.times.N.sub.2 SA(1) ##EQU1## where Dp in the formula (2) represents the mode diameter at the maximum frequency in the intraaggregate pore diameter distribution of the carbon black determined with a differential scanning calorimeter (DSC), and DBP represents the dibutyl phthalate absorption number.

Abstract: There is disclosed carbon black for a tire tread rubber which has a nitrogen adsorption specific surface area (N.sub.2 SA) of 60 to 160 m.sup.2 /g and a dibutyl phthalate absorption (DBP) of 90 to 150 ml/100 g which belong to the respective regions of hard grades of carbon black, and an intraaggregate void volume Vp (ml/g) at least equal to the value calculated according to the equation: [0.00976.times.DBP-0.0358].

Abstract: The present invention discloses a process for producing a boron nitride-coated SiC whisker, comprising dissolving a borazine represented by the following formula (I) in hexane, dispersing a SiC whisker in the resultant solution, collecting the SiC whisker thus treated by filtration, drying and baking it in a non-oxidizing atmosphere at 1000.degree. to 1800.degree. C. to form a boron nitride coating on the surface of the SiC whisker: ##STR1## wherein R is an atom or a group selected from the group consisting of Cl, N(C.sub.2 H.sub.5).sub.2, NH.sub.2, NHCH.sub.3 and CH.sub.3, and R' is an atom or a group selected from the group consisting of H and CH.sub.3.

Abstract: A rubber composition comprising 100 parts by weight of a rubber component and compounded therewith 30 to 100 parts by weight of a carbon black of the category of hard carbon blacks having a nitrogen adsorption specific surface area (N.sub.2 SA) of 58 to 139 m.sup.2 /g, a DBP absorption number of 90 to 150 ml/100 g and having such selective characteristics that the intraaggregate void size, D.sub.p (nm), as measured by mercury porosimetry is equal to or higher than a value calculated by the relational formula [-0.22.times.(N.sub.2 SA)+60.8].

Abstract: A process for producing a magnetite-coated electrode which comprises kneading an iron oxide powder, water and an organic binder under pressure sufficient to prepare a molded article, baking the molded article in a gas atmosphere mainly composed of a member selected from the group consisting of carbon dioxide and steam to prepare a magnetite sinter having an Fe to 0 ratio of 3:3.7 to 4.0, pulverizing the sinter to prepare a powder, and subjecting a metallic substrate to plasma spray coating, plasma jet spray coating, explosive spray coating and water plasma spray coating by making use of the powder as the spray coating source in a neutral gas atmosphere to form a magnetite coating on the surface of the metallic substrate.

Abstract: A method of disposing of a fiber reinforced aluminum alloy composite, which comprises putting an aluminum alloy composite reinforced with inorganic short fibers into a molten steel in the deoxidizing process for steel production.

Abstract: A device for counting the number of very small projections on a surface of an object, which includes a casing therein housing a probe to be scanned in contact with the surface of the object having continuously occurring very small projections, a tip end portion of the probe being projected out of a forward end of the casing; a detecting unit including an acceleration sensor; a comparator for converting electric signals emitted from the detecting unit into pulse signals; a latching device provided with a delay circuit for latching the pulse signals received and maintaining its emitted signals for a certain length of time; and a display device for counting and displaying the output signals from the latching device.

Abstract: Carbon black for compounding into a tire tread rubber which has a nitrogen adsorption specific surface area (N.sub.2 SA) of 120 to 165 m.sup.2 /g and a dibutyl phthalate absorption of at least 120 ml/100 g which belong to the respective regions of hard grade of carbon black, and has such a value G defined by the following equation (1) as satisfying the following formula (2): ##EQU1## wherein [.DELTA.D.sub.st ] stands for a difference between two equivalent Stokes diameters at two points on the distribution curve of aggregates at which the absorbance is 50% of the maximum absorbance; [D.sub.st ] stands for an equivalent Stokes diameter (nm) at the maximum absorbance of the distribution curve of aggregates; [N.sub.2 SA] stands for a nitrogen adsorption specific surface area (m.sup.

Abstract: The present invention discloses a carbon black having an N.sub.2 SA of 75 to 105 m.sup.2 /g and a compressive DBP absorption of at least 110 ml/100 g and, at the same time, having the following selective characteristic values:true specific gravity.ltoreq.1.9080-0.0016.times.N.sub.2 SA;void diameter of particle aggregates (nm).gtoreq.62.2-0.236.times.N.sub.2 SA; andrange of aggregate size distribution [.DELTA.Dst (nm)].gtoreq.30.6+0.6118.times.Dst.

Abstract: There is disclosed carbon black for a tire tread which has a cetyltrimethylammonium bromide specific surface area (CTAB) of 120 to 160 M.sup.2 /g, a dibutly phthalate absorption number of compressed sample (24M4DBP) of at least 100 to 145 ml/100g, a tinting strength (Tint) of 100 to 150%, and such a value Ma defined by the following equation (1) as to satisfy the relationship expressed by the following formula (2): ##EQU1## wherein N.sub.2 SA is a nitrogen adsorption specific surface area (m.sup.2 /g), and Dst is the equivalent Stokes diameter (nm) at the maximum absorbance of the distribution curve of aggregates determined by the centrifugal classification method, and psMa.gtoreq.1.7-0.005 [CTAB]TM . . . (2).

Abstract: A granular carbonaceous heat insulator comprising a carbon black pellet the surface of which is coated with a carbon layer having a dense structure is disclosed. This heat insulator is prepared by adhering a binder solution to a carbon black pellet, heating the resulting coating to remove a solvent from the binder solution and, at the same time, to cure the binder, and baking the carbon black pellet coated with the cured binder in a non-oxidizing atmosphere to carbonize the cured binder. Alternatively, the heat insulator is prepared by subjecting a carbon black pellet having specific characteristics to wet granulation in the presence of a binder solution to crush the carbon black pellet and, at the same time, to granulate the crushed pellet, thereby preparing a granulated carbon black pellet, followed by removal of the solvent from the prepared pellet, curing of the binder and baking of the cured binder in the same manner as that described above.

Abstract: Magnetic carbon black, a process for preparing the same, and a method of modifying magnetic carbon black are provided. The magnetic carbon black is prepared by process A in which when a hydrocarbon is supplied into a high temperature combustion gas stream formed by combustion of a fuel to prepare carbon black, an organic transition metal compound is supplied together with the hydrocarbon and, at the same time, an oxygen gas is supplied from the circumference of the hydrocarbon, process B in which a transition metal compound is supplied together with a hydrogen gas on the downstream side of the supply position of the hydrocarbon, and process C in which a hydrocarbon is supplied into a high temperature combustion gas stream on both the upstream side and the downstream side and a transition metal compound is supplied from a position between the supply positions of the hydrocarbon.

Abstract: The present invention discloses carbon black for a tire tread having a cetyltrimethyl ammonium bromide specific surface area (CTAB) of 120 to 160 m.sup.2 /g, a dibutyl phthalate absorption number of compressed sample (24M4) of 95 to 135 ml/100 g, and a tinting strength (Tint) of 100 to 150% and exhibits an M value defined by the following formula (1) and satisfying the following formula (2): ##EQU1## wherein IA is the iodine adsorption number (mg/g), N.sub.2 SA is the nitrogen adsorption specific surface area (m.sup.2 /g), Dst is the equivalent Stokes diameter (nm) at the maximum absorbance of the distribution curve of aggregates determined by the centrifugal classification method, and .DELTA.Dst is the difference (nm) between two equivalent Stokes diameters at two points on the distribution curve of aggregates at which the absorbance is 50% of the maximum absorbance.

Abstract: Disclosed are surface-coated SiC whiskers, proceses for preparing the same, a ceramic reinforced with the same, and a process for preparing said reinforced ceramic. The surface-coated SiC whiskers are SiC whiskers (I) having a surface coated with a thin carbonaceous layer having a thickness of 7 to 100 .ANG., or SiC whiskers (II) having a surface coated with an Si.sub.3 N.sub.4 layer. The SiC whiskers (I) can be prepared by dispersing SiC whiskers in a homogeneous solution of a thermosetting resin in an organic solvent, separating the whiskers by filtration and drying it, curing the thermosetting resin, and firing the cured thermosetting resin in a non-oxidizing atmoshpere at 800.degree. to 1,600.degree. C. The SiC whiskers (II) can be prepared by dispersing SiC whiskers in a solution of an organosilicon polymer in an organic solvent, separating the whiskers by filtration and drying it, heating the whiskers coated with the organosilicon polymer in a nitriding atmoshpere at 1,200.degree. to 1,600.degree. C.