| 摘要 |
<p>The substrate (10) is placed within a housing (12) and heated in such a way as to set up a temperature gradient within the substrate so that the latter presents a temperature which is higher in the portions remote from its exposed surfaces than at said exposed surfaces. A carbon precursor gas phase comprising at least one saturated or unsaturated hydrocarbon is introduced in the housing, formation of the pyrocarbon being enhanced in the portions of the substrate having a higher temperature. The gas phase comprises a mixture consisting of at least one saturated or unsaturated hydrocarbon and hydrogen, and the substrate is heated so as to create within the substrate a temperature gradient on either side of a temperature of 1500 °K, the hydrogen acting as inhibitor at a temperature lower than 1500 °K.</p> |
