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.

Dynamic Testing and Reinforcement of Rubber

Abstract: A series of experiments have been run to determine which mechanisms dominate carbon black reinforcement of rubber. A broad range of compounds using oil-extended and non-oil-extended rubbers and carbon blacks covering the spectrum of tread blacks have been tested. The results for measurements made in an all-SBR formulation are reported here. The primary experiment consisted of measurement of the dynamic modulus and hysteresis of the cured and uncured compounds over a broad range of frequencies, temperatures, and strains. Ternperatures ranged from −70°C to +90°C; frequencies varied from 0.01 to 10 Hz; double strain amplitudes varied from 0.5% to 35%. From a discussion of the literature and evaluation of the experimental results, two mechanisms have been found to control the primary effects of carbon black on rubber reinforcement, where reinforcement refers to a general enhancement of properties, such as modulus, as well as the tensile strength of the compound. Hydrodynamic interaction, which is the...

Microstructure of Carbon Black

Abstract: Although the microstructure of carbon black has been under investigation for more than fifty years, there are still many aspects which are controversial and some which are virtually unexplored. The inherently low degree of crystallinity and the finely-divided state of carbon blacks have greatly hindered efforts to understand them. The purpose of this article is to cite the principal contributors to our understanding of carbon black microstructure, to discuss the significance of their contribution, to present a clear picture of the present state of our knowledge, and to note areas where controversy exists and where our knowledge is incomplete. The scope of this article is necessarily limited to a reasonably complete treatment of the several aspects of carbon black microstructure; that is, the arrangement of carbon atoms to form graphite layer planes, the arrangement of layer planes to form crystallites, and the arrangement of crystallites to form the more familiar carbon black “particles” or aggre...

Process for producing carbon black

Abstract: There is disclosed herein a process for the production of oil furnace carbon blacks, which process is characterized by exceptionally high throughput, efficient use of heat, facile scale-up, high yields and the ability to produce high quality novel and desirable carbon blacks. The process involves the use of a staged reaction system whereby there is provided, seriatim, a combustion zone, a feedstock injection zone and a carbon forming zone.

Method of making tantalum metal powder with controlled size distribution and products made therefrom

Abstract: A process for sizing (i.e., comminuting) a tantalum powder including agglomerates of smaller particles, which process yields a tantalum powder having an as-comminuted agglomerate size distribution with the product of the Volume Mean Diameter, MV (in microns as measured by light scattering techniques such as Microtrac analysis), times specific surface area BET (m2/g), being less than about 25. These powders after sizing typically have ratios of Scott Bulk Density: BET Surface Area in the range from about 20 to about 35. Also provided are powders having a substantially unimodal and narrow agglomerate size distribution in all stages of production, namely after sizing (i.e., deagglomeration by comminution), thermal agglomeration (i.e., heat treatment), and deoxidation. These resultant powders have high surface area and good flowability properties and, upon sintering, exhibit controlled shrinkage with high porosity. Further provided are sized heat treated tantalum powders having agglomerate particle sizes wherein the product of the Volume Mean Diameter, MV, times the specific surface area, BET, is in the range from about 90 to about 250. Sized and agglomerated powders which are deoxidized are also provided wherein the product of the Volume Mean Diameter, MV, times the specific surface area, BET, is in the range from about 90 to about 250.