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Showing papers by "Cabot Corporation published in 1983"


PatentDOI
TL;DR: In this article, an acoustic earmuff device is described, where an articulated ear-to-headband attachment construction is provided to provide sufficient freedom of pivotal motion relative to the headband as to allow each earmmuff to readily assume the proper wearing position with respect to the user.
Abstract: There is disclosed an acoustic earmuff device wherein there is provided an articulated earmuff-to-headband attachment construction which is readily fabricated and assembled and which provides sufficient freedom of pivotal motion of the earmuff relative to the headband as to allow each earmuff to readily assume the proper wearing position with respect to the head of the user. The invention utilizes a soft resilient grommet fitted through an aperture in the back wall of a rigid earcup to articulatingly capture a rigid stud extending inwardly from an end portion of a resilient headband.

72 citations


Patent
14 Sep 1983
TL;DR: A typical alloy generally contains chromium, nickel, silicon, carbon, an effective cobalt content and the balance iron plus normal impurities as discussed by the authors, and may be produced in the form of castings, P/M products, hardfacing and welding materials and wrought mill products.
Abstract: A high chromium stainless steel especially suited for use as wear (galling) resisting components, for example, valve parts. A typical alloy generally contains chromium, nickel, silicon, carbon, an effective cobalt content and the balance iron plus normal impurities. The alloy may be produced in the form of castings, P/M products, hardfacing and welding materials and wrought mill products.

64 citations


Journal ArticleDOI
TL;DR: The majority of the soot extracts assayed were at a much higher level of mutagenicity than any of the carbon black extracts, and even greater differences in mutagen availability would be expected if the unextracted materials were compared in vivo.

54 citations


Journal ArticleDOI
H. M. Tawancy1
TL;DR: In this article, transmission electron microscopy and diffraction were used to characterize the microstructural changes which occur in Hastelloy alloy X after long-term ageing (up to 16 000 h) at various temperatures in the range 540 to 870° C.
Abstract: Transmission electron microscopy and diffraction were used to characterize the microstructural changes which occur in Hastelloy alloy X after long-term ageing (up to 16 000 h) at various temperatures in the range 540 to 870° C. The corresponding effects on mechanical properties were determined. It was found that the alloy age hardens at temperatures in the range of 650 to 870° C. Overageing occurred at 760 and 870° C. Marked reductions in room-temperature tensile elongation were observed after ageing at all the temperatures investigated. However, in no case was the elongation reduced to less than 15 to 30%. Also, the tensile elongation at temperatures corresponding to the respective ageing temperatures was unaffected by 16 000 h ageing at a temperature. It was concluded that the above effects were associated with precipitation of various phases, such as carbides, sigma- and mu-phases, in the matrix and at the grain boundaries.

50 citations


Journal ArticleDOI
TL;DR: In this paper, the incubation period preceding rollover within a stratified LNG tank involves intensive heat and mass transfers between layers, and numerical integration of equations describing these processes leads to predicted time-history and boil-off characteristics which are in excellent agreement with Sarsten's (1972) documentation of the LaSpezia rollover incident.
Abstract: The incubation period preceding ''rollover'' within a stratified LNG tank involves intensive heat and mass transfers between layers. Numerical integration of equations describing these processes leads to predicted time-history and boil-off characteristics which are in excellent agreement with Sarsten's (1972) documentation of the LaSpezia rollover incident.

40 citations


Patent
19 Aug 1983
TL;DR: In this paper, a process for producing a copper beryllium alloy is described, which is characterized by the improvement comprising the steps of:solution annealing the cold-warmed copper-borilium alloy at a tem-perature of from 1275 (691) to 1375 (746°C); hardening the annealed copper-bourger at a temperature of from 400 (204) to 580°F (304°C).
Abstract: COPPER BERYLLIUM ALLOY AND THE MANUFACTURE THEREOF ABSTRACT OF THE DISCLOSURE A process for producing a copper beryllium alloy. The process includes the steps of: preparing a copper beryllium melt; casting the melt; hot working the cast copper beryllium;annealing the copper beryllium; cold working the annealed copper beryllium; and hardening the copper beryllium; and is characterized by the improvement comprising the steps of:solution annealing the cold worked copper beryllium at a tem-perature of from 1275 (691) to 1375°F (746°C); hardening the annealed copper beryllium at a temperature of from 400 (204) to 580°F (304°C); cold rolling the hardened copper beryllium; and stress relief annealing the cold worked copper beryllium at a temperature of from 400 (204) to 700°F (371°C). An alloy consisting essentially of, in weight percent, from .4 to 2.5% beryllium, up to 3.5% of material from the group consisitng of cobalt and nickel, up to 0.5% of material from the group consisting of titanium and zirconium, up to 0.3%iron, up to 0.7% silicon, up to 0.3% aluminum, up to 1.0% tin, up to 3.0% zinc, up to 1.0% lead, balance essentially copper. The alloy is characterized by equiaxed grains. The grains have an average grain size of less than 9 microns. Substantially all of the grains are less than 12 microns in size.

28 citations


Patent
30 Mar 1983
TL;DR: A reactor for the production of carbon black is described in this article, which is characterized by axial flow of combustion gases and sequential converging sections for sequentially accelerating the hot combustion gases used to drive the pyrolysis reaction.
Abstract: A reactor for the production of carbon black is disclosed which is characterized by axial flow of combustion gases and sequential converging sections for sequentially accelerating the hot combustion gases used to drive the pyrolysis reaction.

26 citations


Patent
Fife James A1
27 Oct 1983
TL;DR: In this paper, a method for producing fiber-shaped tantalum powder by deforming a composite of tantalum and an auxiliary metal was proposed, and the powder was produced thereby.
Abstract: A method for producing fiber-shaped tantalum powder by deforming a composite of tantalum powder and an auxiliary metal, and the powder produced thereby.

21 citations


Patent
15 Mar 1983
TL;DR: Disclosed is an alloy eminently suited for use as a tubular product in deep, sour gas operations as discussed by the authors, which has an optimum combination of corrosion resistance, high strength in the cold worked condition and resistance to sulfide stress cracking and stress corrosion cracking.
Abstract: Disclosed is an alloy eminently suited for use as a tubular product in deep, sour gas operations. The alloy has an optimum combination of corrosion resistance, high strength in the cold worked condition and resistance to sulfide stress cracking and stress corrosion cracking. A typical alloy contains, in weight percent, 0.03 carbon, 22 chromium, 36 iron, 3 molybdenum, 1 manganese, 36 nickel, 0.60 silicon, 0.15 nitrogen, up to 3 tungsten and incidental impurities including copper, cobalt, columbium, tantalum and titanium.

18 citations


Patent
25 Nov 1983
TL;DR: In this article, a process for producing a wrought product of improved ductility from substantially non-compactible prealloyed metal powder is described, and the process comprises the steps of: comminuting substantially noncompactable prealloysed metal powders so as to flatten the particles thereof; heating the comminuted particles of metal powder at an elevated temperature, the particles adhering and forming a mass during heating; crushing the mass of metal powdering; compacting the crushed mass of powder; sintering the metal powder; and hot working the
Abstract: A process for producing a wrought product of improved ductility from substantially noncompactible prealloyed metal powder. The process comprises the steps of: comminuting substantially noncompactible prealloyed metal powder so as to flatten the particles thereof; heating the comminuted particles of metal powder at an elevated temperature, the particles adhering and forming a mass during heating; crushing the mass of metal powder; compacting the crushed mass of metal powder; sintering the metal powder; and hot working the metal powder into a wrought product. The wrought product has a chemistry which is substantially the same, with the exception of carbon and certain residuals, as the chemistry of the prealloyed powder.

14 citations


Journal ArticleDOI
01 Nov 1983-JOM
TL;DR: A new wrought nickel-base alloy, designated CABOT®* alloy No. 214, has been developed for applications in the heating industry as discussed by the authors, which combines the outstanding oxidation and environmental resistance of the Ni-Al base coating systems with the workability of more conventional chromia-protected alloy systems.
Abstract: A new wrought nickel-base alloy, designated CABOT®* alloy No. 214, has been developed for applications in the heating industry. The alloy, composed principally of nickel, chromium, aluminum, iron, and yttrium, combines the outstanding oxidation and environmental resistance of the Ni-Al base coating systems with the workability of more conventional chromia-protected alloy systems to yield a superior product for extended service applications up to and above 2200°F (1200°C). The enhanced oxidation resistance of the alloy is the result of the tenacious Al2O3 film which forms on the surface of the alloy at high temperatures. In addition to describing the oxidation, carburization, and chlorination resistance of the alloy, the metallurgical traits of microstructure and mechanical properties are reviewed.

Patent
14 Nov 1983
TL;DR: In this paper, a process for dissolving tantalum and columbium-containing materials contaminated with alkali metal impurities is described, where the impurities are reacted to form precipitated fluosilicates, which then can readily be separated.
Abstract: Disclosed is a process for dissolving tantalum and/or columbium-containing materials contaminated with alkali metal impurities. The tantalum and columbium materials are digested in a solution comprising hydrofluoric acid and a fluosilicate-containing compound. The alkali metals are reacted to form precipitated fluosilicates, which then can readily be separated.

Journal ArticleDOI
P. E. Manning1
TL;DR: In this paper, results of immersion pitting, immersion crevice, and slow scan potentiodynamic pitting tests are compared to assess the relevance of particular types of accelerated laboratory tests for lo...
Abstract: Results of immersion pitting, immersion crevice, and slow scan potentiodynamic pitting tests are compared to assess the relevance of particular types of accelerated laboratory tests for lo...

Book ChapterDOI
01 Jan 1983
TL;DR: Soot is a mixture of particulate carbon with various organic and inorganic components, and it is generally formed as an unwanted byproduct of combustion; thus, soots differ widely according to the type of fuel, the conditions of combustion, and the method of collection as discussed by the authors.
Abstract: Soot is a mixture of particulate carbon with various organic and inorganic components. It is generally formed as an unwanted by-product of combustion; thus, soots differ widely according to the type of fuel, the conditions of combustion, and the method of collection. Chimney soot was the first recognized occupational carcinogen. Its carcinogenicity is due to components other than particulate carbon, especially soluble organic compounds which form a significant portion of such soots1

Journal ArticleDOI
TL;DR: Clinical and laboratory data, including measurement of urinary trichloroacetic acid concentrations, are presented and toxic encephalopathy, hepatitis, and carpal spasm occurred among young, healthy workers.
Abstract: Trichloroethylene, a solvent used in a variety of industrial settings for more than 60 years, has caused adverse health effects on the central and peripheral nervous system, the skin, liver, kidney, and heart. Three men have shown relatively unusual manifestations secondary to exposure to trichloroethylene in degreasing operations in the jewelry industry. Toxic encephalopathy, hepatitis, and carpal spasm occurred among young, healthy workers. Clinical and laboratory data, including measurement of urinary trichloroacetic acid concentrations, are presented.

Patent
07 Nov 1983
TL;DR: In this article, a process for producing columbium solutions substantially free from antimony contamination is described, where an aqueous columbial solution is contacted with an organic solvent to extract the antimony.
Abstract: A process is disclosed for producing columbium solutions substantially free from antimony contamination. An aqueous columbium solution is contacted with an organic solvent to extract the antimony.

Patent
21 Oct 1983
TL;DR: An improved carbon black burner for producing a carbon black with reduced grit content is described in this paper, where feedstock oil is introduced radially into an atomizing fluid conduit through ports located proximate the discharge orifice of the burner.
Abstract: An improved carbon black burner for producing a carbon black with reduced grit content wherein feedstock oil is introduced radially into an atomizing fluid conduit through ports located proximate the discharge orifice of the burner.

Patent
25 Nov 1983
TL;DR: A powder metallurgical process for producing a wrought product characterized by a low level of residual impurities is described in this article, where the process comprises the steps of: comminuting metal powder to effect a reduction in particle size, at least 60% of the comminuted particles being capable of passing through a -270 mesh Tyler screen; blending the metal powder with a softer metal-bearing powder; heating the blended powder particles at an elevated temperature, the particles adhering and forming a mass during heating; crushing the mass of powder particles; cold-isostatically
Abstract: A powder metallurgical process for producing a wrought product characterized by a low level of residual impurities. The process comprises the steps of: comminuting metal powder to effect a reduction in particle size, at least 60% of the comminuted particles being capable of passing through a -270 mesh Tyler screen; blending the metal powder with a softer metal-bearing powder; heating the blended powder particles at an elevated temperature, the particles adhering and forming a mass during heating; crushing the mass of powder particles; cold-isostatically pressing the crushed mass of powder; sintering the powder in the absence of an encapsulating member under conditions which effect a reduction in the nitrogen, oxygen and carbon levels of the powder; and hot working the sintered powder into a wrought product. The wrought product has less than 0.015% carbon.

Patent
10 Nov 1983
TL;DR: A process for refining metal in a crucible containing a layer of molten slag, wherein molten metal passes downwardly through the slag and resolidifies as an ingot thereunder, is described in this paper.
Abstract: A process for refining metal in a crucible containing a layer of molten slag, wherein molten metal passes downwardly through the slag and resolidifies as an ingot thereunder. The slag is kept molten by passing electrical current through the slag layer and between a first electrode and a second electrode. The second electrode has liquid or gas cooling means as an integral part thereof. Current is passed between the first electrode and the second electrode through at least one electrically conductive member interposed between the slag and the second electrode. The electrically conductive member has a melting temperature above the melting temperature and below the bulk temperature of the slag. A portion of the surface of the electrically conductive member that is in contact with the slag has a temperature above the freezing temperature of the slag. The first electrode may be a consumable electrode which is partially immersed in the layer of molten slag such that it gradually melts, and drops of metal move downwardly therefrom. The second electrode is usually the crucible but may be a non-consumable electrode which is partially immersed in the layer of molten slag.

Journal ArticleDOI
J. Kolts1
TL;DR: In this article, a 25 pct chromium duplex stainless steel, FERRALIUM alloy 255, as related to sour gas well applications is presented, which exhibits negligible corrosion rates in NaCl-, CO2-, and H2S-containing environments to 200 ‡C (400 ‡F).
Abstract: Some of the properties of a 25 pct chromium duplex stainless steel, FERRALIUM ® alloy 255,* as related to sour gas well applications are presented. Autoclave tests have demonstrated negligible corrosion rates in NaCl-, CO2-, and H2S-containing environments to 200 ‡C (400 ‡F). The duplex stainless steel exhibited resistance to environmental embrittlement for a broad range of H2S concentrations. At high H2S concentrations stress corrosion cracking (SCC) is found to occur. Sigma phase formation is detrimental to SCC resistance. Heat treatments at temperatures of 1040 ‡C to 1150 ‡C (1900 ‡F to 2100 ‡F), which are above the sigma-phase formation temperatures, did not have a measurable effect on SCC as determined with plastically deformed two-point beam specimens.