Cabot Corporation

About: Cabot Corporation is a company organization based out in Boston, Massachusetts, United States. It is known for research contribution in the topics: Carbon black & Carbon. The organization has 1279 authors who have published 1399 publications receiving 36736 citations.

Sintered high performance metal powder alloy

Abstract: Articles of high performance chromium-containing cobalt-base alloys sintered from powder contain boron in amounts between about 0.1 and 1.0%. The addition of boron widens the range of sintering temperatures sufficiently to make possible commercial production of articles of compositions which otherwise are difficult or impossible to sinter.

Welding method for cured polymeric compositions

Abstract: 1,132,906. Branch fittings. CABOT CORP. 18 May, 1966 [20 May, 1965], No. 22067/66. Heading F2G. [Also in Division B5] Compositions comprising a cured polymeric material and between 20 parts and 500 parts per 100 parts by weight of the material of an electrically conductive filler are welded by localized heating of the surfaces to be welded to above the softening temperatures thereof, interposing between said surfaces an adhesive composition comprising a thermally activatable curing agent, bringing said surfaces into direct proximity with each other with only the adhesive composition therebetween, and flow sufficient electric current through the cured compositions and the adhesive to activate the adhesive. The cured or "cross-linked" polymeric composition may be a cured polymer or copolymer of a lower α-mono-olefinic hydrocarbon, e.g. polyethylene, polypropylene, ethylene/butene-1 copolymers, ethylene/propylene copolymers and mixtures thereof. The filler material is preferably a carbon black such as thermal black, acetylene black, oil furnace black, gas furnace black, channel black or a mixture thereof. Alternatively, the filler material may be a finely-divided or powdered metal or-metal alloy, such as copper, iron, nickel, chrome/nickel, aluminium or iron/nickel. Curing may be effected by gamma or ultra-violet irradiation of the composition or by thermal activation of a suitable curing agent, e.g. an organic peroxide, dispersed therein. The adhesive comprises a curing agent which may be an organic peroxide, such as di-α-cumyl peroxide, tert.-butyl-α-cumyl peroxide, tert.-butyltriphenyl methyl peroxide, decanoyl peroxide, caprylyl peroxide, or benzoyl peroxide, or may be a quinone oxime or a quinone oxime derivative. Preferably, the adhesive interlayer comprises an essentially uncured polymer containing at least 20 parts, e.g. 50-120 parts, per 100 parts by weight of the polymer of an electrically conductive filler and between 0A5 and 10 parts per 100 parts of a curing agent of one of the types specified above. Preferably, a curing agent is chosen which has an active curing temperature range at least slightly above the softening temperature of the adhesive composition. The adhesive composition may be applied to the surfaces in a finely granular or powdered form, as a solution or as a sheet or film. Prior to application of the adhesive the surfaces are heated above the softening temperature thereof to a depth of between 1 / 16 inch and ¢ inch by flame impingement or by a hot iron contoured to the shape of the surfaces. In the embodiment shown, to form a "T" pipe joint, surfaces 3, 4 of pipe portions 1, 2 to be joined are heated, an adhesive film 5 is placed between the surfaces 3, 4 and the portions 1, 2 are brought together. An air powered ram is lowered on to a surface 14 and an electric current is passed between the electrodes 6, 9 to earth to effect the welding. Thermocouples 10, 11, 12, 13 are inserted into the portions 1, 2 to measure the temperatures thereof during welding.

Vanadium recovery from scrap alloys

Abstract: Disclosed is a process for recovering chromium, vanadium, molybdenum, and tungsten from secondary resources such as alloy scrap comprising a refractory metal and base metals such as cobalt, nickel, iron, and copper The scrap is calcined with sodium carbonate in air to convert the refractory metal values to MoO4 =, VO4sup≡, WO4 =, and CrO4 = and the base metals to water insoluble oxides A leach of the calcined materials produces a pregnant liquor rich in refractory metals which, after separation of the vanadium, molybdenum and tungsten values, is treated with CO, CHOO-, CH3 OH, or HCHO to reduce Cr+6 to Cr+3 The carbonate and bicarbonate salts produced as a byproduct of the reduction are recycled to the calcination stage As a result of the V, W, and Mo partition, a mixed solid comprising CaOnV2 O5, CaMoO4, and CaWO4 is produced This is treated with carbonated water or formic acid to selectively dissolve vanadium values which are subsequently recovered by precipitation or extraction The remaining mixed CaWO4 and CaMoO4 solid is treated with H2 O2 and sulfuric acid to reject a Mo and W-free CaSO4 precipitate, and to produce a concentrated solution of tungsten and molybdenum The W values are selectively precipitated from this solution by decomposing the peroxy complexes The process has the advantages that a wide variety of different feed materials can be treated, no energy intensive pyrometallurgy is involved, reagent consumption is minimized, and no aqueous effluents are produced

The use of vinyl functional aerogels for reinforcement of silicone rubbers

Abstract: Silane-treated silicate-based aerogels are excellent reinforcing fillers for silicone rubbers. The physical properties of the aerogel filler can be readily altered by controlling the properties of the hydrogel, and the vinyl functionality of the aerogel surface can be easily and precisely controlled in the silylation step of the aerogel manufacturing process. By changing the vinyl content on the surface of the aerogel, the physical properties of the rubber can be markedly changed without the use of any in situ treating agents during compounding or alteration in the formulation. The silicone rubber hardness and modulus of elasticity exhibit a sensitive response to the vinyl content, while the plasticity of the uncured base shows no effect of vinyl loading. In contrast, the viscosity (plasticity) of the uncured rubber is a strong function of the aerogel surface area, whereas the rubber modulus and strength are only slightly affected by particle properties such as surface area. In addition, the high porosity of aerogels allows for good fracture characteristics and dispersion of the filler during compounding, while the large pore size provides good accessibility to and utilization of the vinyl sites within the porous structure. The ability to easily control the aerogel structure, to completely hydrophobize the silica surface, and to precisely control the vinyl loading make aerogels a potentially useful new particle for rubber reinforcement. A brief summary of the treatment chemistry and the vinyl surface chemistry is also presented in the paper.

Protective nickel base alloy coatings

Abstract: Nickel and cobalt base alloy articles are provided coated with a composition consisting essentially of about 20-60% chromium, 6-11% aluminum, 0.01-2.0% of a reactive metal such as yttrium, lanthanum or cerium and the balance nickel.