Model of Liquid-immersion Chemical Vapour Infiltration

2 Model of Liquid-immersion Chemical Vapour Infiltration 

The first zone is characterised by its function of generating sufficient heat for the CVI process. This heating source is also required to maintain a constant temperature (T) during the CVI process. The heating source initially includes only 

The pyrolysis of the precursors is a complex process and it produces a large number of intermediate species. The composition of the exhaust gases can be analysed by gas phase chromatography. The by-products listed in Table 5.3 are generally the same within temperature range of 1000 to 1350°C when cyclohexane 

Note (1) C6H12 is used as the liquid precursor (2) C3 and C4 undetermined C3 and C4, species (3) ND non-detected products. 

This is the area within the porous preform where the complex heat and mass exchanges occur. In this multiphase system the heat is transferred outwards through convective and radiation mechanisms. The precursor gases are supplied from the outside towards the reactive zone while the exhaust gases are transferred in the reverse direction after the chemical reactions. 

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