Low-pressure cementation method
AssigneeBNP Parlbas
InventorsAymeric Goldsteinas, Laurent Pelissier
Life of this patent
Estimating the term…
Abstract
The invention relates to a low-pressure carburising method comprising alternating low-pressure enrichment steps and diffusion steps in the presence of a neutral gas. During the enrichment steps, an enriching gas and neutral gas mixture is used, the proportion of the neutral gas being between 5 and 50% by volume of the enriching gas. The enriching gas can be, for example, acetylene (C2H2).
Claims7
A low-pressure cementation method comprising using an alternation of low-pressure enrichment steps and of steps of diffusion in the presence of a neutral gas wherein, during the enrichment steps, a mixture of an acetylene (C2H2) enrichment gas and of a carrier gas is used, the carrier gas being in a proportion of from 5 to 50% in volume of the enrichment gas;
- wherein the carrier gas is nitrogen.
Dependencies are inferred from the claim text.