To simulate the carbon diffusion during the process of phase transformation, a random jumping based mesocopic diffusion model is developed.
The carbon remaining in the austenite showed little variation with position at any given reaction time, which ruled out carbon diffusion as a rate-limiting process.
Metallic NiCo2/carbon nanotubes composite microspheres formed as intermediate products—are transformed into composite microspheres of phase-pure NiCo2O4 hollow nanospheres and carbon nanotubes by the nanoscale Kirkendall diffusion process.
The estimated values of the carbon diffusion coefficient and the activation energy of the process reflect the grain boundary mechanism of carbon diffusion through the interfacial layer.
Accordingly, dilute and semi-dilute suspensions of stabilised carbon nanotubes, cellulose whisker and PS nanofibres obey a universal diffusion process according to the Doi Edwards theory.
A review on carburization process modeling is presented and a new model for carbon diffusion in steel subjected to heat treatment by vacuum pulse carburizing is proposed.
They also show that the diffusion process could be accelerated through the implementation of carbon-tax policies that support initial penetration.
In the thermal CVD processes, the catalyst passivation due to the slow carbon diffusion rate limiting and the consequent amorphous carbon formation on the catalyst surface was considered to be the main reason hampering carbon nanotube growth at low temperatures.
Carbon diffusion profiles are compared and concentration dependent diffusion coefficients are discussed to further advance scientific understanding of diffusion process in supersaturated S-phase.
This water had been heated and softened, sent through a carbon bed and a sand filter, and then introduced to a membranous machine whose function was distantly analogous to the gaseous diffusion process by which isotopes of uranium are separated.
