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.

Barium titanate based dielectric compositions

Abstract: The present invention involves a method for producing a variety of barium titanate based powder products consisting of submicron, dispersible primary particles having narrow size distributions. The method, in its broadest aspects, involves heating an aqueous slurry of PbO, or Pb(OH)2, and Ca(OH)2 with a stoichiometric excess of the hydrous oxides of Ti(IV), Sn(IV), Zr(IV) and Hf(IV) to a temperature not exceeding 200° C. Thereafter, the resulting slurry temperature is adjusted to between 50° and 200° C. and a solution of Ba(OH)2 and Sr(OH)2, having a temperature of 70° to 100° C. is added within a period of five minutes or less to the slurry. About 10 minutes after the addition of the Ba(OH)2 and Sr(OH)2 solution is completed, the slurry is heated to a temperature not exceeding 225° C. to ensure formation of a stoichiometric perovskite product. Thereafter, the slurry is cooled and the solid product is recovered.

Long-term ageing characteristics of some commercial nickel-chromium-molybdenum alloys

Abstract: The long-term ageing characteristics of some commercial Ni-Mo-Cr alloys (the high-temperature HASTELLOY alloy S and the corrosion resistant HASTELLOY alloys C-4 and C-276) at 810 K were investigated. It was found that the three alloys undergo the following long-range ordering reaction: disordered f c c lattice → ordered orthorhombic, Pt2Mo-type superlattice. Ordering was found to cause considerable strengthening without severe loss of tensile elongation. Deformation in the ordered state occurred predominantly by twinning. The corrosion rates of alloys C-4 and C-276 in boiling sulphuric-ferric sulphate solution did not seem to be greatly affected by the long-range ordering reaction. In addition to ordering, the three alloys were also found to undergo grain boundary reactions. The resulting phase in alloys S and C-4 assumed a dispersed morphology and was identified as carbide, probably of the Type M12C. In alloy C-276, however, which contains higher amounts of iron and tungsten, the boundary precipitate was in the form of a continuous layer consisting of M12C and Mu-phase. This could account for the reduced tensile elongation of alloy C-276 relative to alloys S and C-4 and also to its high corrosion rate.

Effect of Carbon Black Dispersion on the Mechanical Properties of Rubber Vulcanizates

Abstract: A study has been made of the mechanics of mixing of carbon black in rubber by determining the influence of agglomerates in the mix on the final properties of the vulcanizate. It is suggest...

Process for preparing modified pigments

Abstract: The present invention relates to a process for preparing a polymer-modified pigment comprising the step of: combining, in any order, at least one pigment having attached at least one nucleophilic group, at least one polymer comprising at least one carboxylic acid group or salt thereof, and at least one coupling agent. At least one mediator compound may also be used. The modified pigments can be used in applications such as inkjet ink applications.

Photovoltaic conductive features and processes for forming same

Abstract: Photovoltaic conductive features and processes for forming photovoltaic conductive features are described. The process comprises (a) depositing a composition onto at least a portion of a substrate, wherein the composition comprises metal-containing particles having a primary particle size of from about 10 nanometers to less than 500 nanometers and including a continuous or non-continuous coating of a ceramic material; and (b) heating the composition such that the precursor composition forms at least a portion of a photovoltaic conductive feature. The metal-containing particles are preferably produced by flame spraying.