(a) Figure 8./Low temperature transition in CVI conditions:(a)SL:smooth laminar pyrocarbon and (b)RL:rough laminar pyrocarbon(Cross-polarized light,bar is 10um,after DouX.1994). surface asperity and transmitted across the whole deposit (see Section 3.2).RL density is high:2.0<d<2.2.Anisotropy is high too:Ae>18 up to the maximum (app.22)and OA the disorder is low <25(typically 15). 2.1.3 Isotropic pyrocarbon(1) Isotropic texture has a low reflectance and a very weak anisotropy (or not).Under cross- polars a faint Maltese-cross can hardly be seen.It shows very fine grains with a poor brightness.This texture is often mingled with"isotropic-sooty"pyrocarbons(Section 2.2). The later can have a high density whereas isotropic (ISO)of low density systematically ©2003 Taylor&Francissurface asperity and transmitted across the whole deposit (see Section 3.2). RL density is high : 2.0  d  2.2. Anisotropy is high too: Ae  18 up to the maximum (app. 22) and OA the disorder is low 25 (typically 15). 2.1.3 Isotropic pyrocarbon (I) Isotropic texture has a low reflectance and a very weak anisotropy (or not). Under cross￾polars a faint Maltese-cross can hardly be seen. It shows very fine grains with a poor brightness. This texture is often mingled with “isotropic-sooty” pyrocarbons (Section 2.2). The later can have a high density whereas isotropic (ISO) of low density systematically Figure 8.1 Low temperature transition in CVI conditions: (a) SL: smooth laminar pyrocarbon and (b) RL: rough laminar pyrocarbon (Cross-polarized light, bar is 10m, after Doux, 1994). (a) (b) © 2003 Taylor & Francis