Showing papers by "Cabot Corporation published in 1977"

Powder metallurgy compacts and products of high performance alloys

Abstract: A powder metallurgy compact and a sintered product is provided from high performance alloys difficult to compact and/or sinter The green compact comprises a mixture of the alloy powder, which, as a result of blending and extruding is coated with a film of a solid organic binder, and consolidated to discrete bodies of an intermediate density The green compacts are sintered to produce a final solid product

Resistivity of Unvulcanized Compounds of Rubber and Carbon Black

Abstract: 1. A coaxial probe has been developed which allows measuring electrical resistivity of uncured carbon black-rubber compounds with good precision (mean coefficient of variation 4%). 2. For a given compound the resistivity correlates well with the standard dispersion rating and thus can be used for rapid monitoring of dispersion at various stages of processing. 3. Resistivity may also serve as a check on the loading and type of black in a rubber compound. 4. The resistivity of uncured compounds is higher by a factor of 2–10 than the corresponding vulcanizate value. 5. The logarithm of the resistivity appears to be a linear function of the reciprocal of the absolute temperature. The apparent activation energy of conductance for SBR compounds is 14.7–29.3 kJ/mol, the higher values being found for the better dispersions. The activation energies of EPDM compounds were found to be approximately 50% higher than those of SBR.

Asphalt cement and concrete compositions and filler compositions therefor

Abstract: There are provided improved asphalt cements and bituminous paving compositions containing certain reinforcing filler compositions which impart desirable properties thereto. The filler compositions of the invention are asphalt-dispersible pellets comprising certain carbon blacks which have been treated with certain non-volatile petroleum oils.

High yield strength Ni-Cr-Mo alloys and methods of producing the same

Abstract: OF THE DISCLOSURE A process and an alloy are proved for producing high strength material having good ductility to provide a high strength, corrosion resistant alloy including the steps of (1) preparing a body of material having a composition consisting essentially of by weight, about 13% to 18%chromium, about 13% to 18% molybdenum, less than 0.01%carbon, less than about 6% iron, less than about 1.25%cobalt, less than about 4% tungsten, less than 0.5%aluminum, less than 1% manganese, less than 0.5% silicon, and the balance nickel with usual transient metals and impurities in ordinary amounts, and (2) thereafter aging said body at a temperature in the range about 900° and 1100°F to effect an A2B ordering reaction in the composition, the engineering properties of these alloys are parti-cularly useful where a combination of high strength, ductility and corrosion resistance is essential, such as shafts in centrifuges, marine shafts, propulsion components and the like.

Diamond wire drawing die blanks and methods of making the same

Abstract: A wire drawing die blank and method of producing the same is provided in which the blank is made by: A. forming a compact of a superalloy powder containing a diamond and having an outside diameter smaller than the diameter of the drawing apparatus die aperture in which it is to be used, B. pressing a ring of powdered stainless steel having an inner annular opening adapted to receive the sintered superalloy compact containing a diamond and an outer diameter adapted to fit a drawing die apparatus aperture in which it is to be used, said powdered stainless steel having a shrinkage coefficient on sintering sufficient to cause the ring to shrink onto and tightly engage said compact, and C. sintering the stainless steel at a temperature below the melting point of the compact to consolidate and shrink the stainless steel onto the compact and to metallurgically bond the stainless steel and the superalloy of the compact.

Nickel alloy contg. chromium, aluminium and yttrium - with high thermal shock resistance, and useful for coating nickel or cobalt base superalloys

Abstract: The nickel or cobalt base alloy is coated with a mixt. contg. 20.60(20-50)% chromium, 6-138-13.5)% aluminium, 0.01-2.0(0.1-1.75)% of a reactive metal (I), the remainder being nickel. Pref. (I) is yttrium and/or lanthanum and/or cerium, esp. yttrium. Used coatings for gas turbine components exposed to max. temp., e.g. rotor or stator blades or combustion chambers. The coating is ductile so no cracks occur at room temp. and very high resistance to thermal shock is obtd. e.g. in the cyclic operation of aircraft engines.