Growth of Pyrocarbon by Multi-Physics Fields Chemical Vapor Infiltration
نویسندگان
چکیده
A novel rapid chemical vapor infiltration (CVI) processing defined by multi-physics fields CVI was used to fabricate carbon/carbon (C/C) composites. Liquid petrol gas is used as carbon source and the parameters were experimental tested and optimized. The influence of temperature and pressure on the growth of pyrocarbon was investigated in detail. Because of the influence of multi-physics fields, a new surface morpha is grown under control parameters. It is called “Dot Structure”. The structure of pyrocarbon is analyzed and characterized by XRD, SEM with EDS, and Raman spectrum. At the end, a simple model of point discharge for growth of pyrocarbon is proposed. The deposited pyrocarbon based on multi-physics fields chemical vapor infiltration is expected to provide an improve performance in rapid C/C composites fabrication.
منابع مشابه
Modelling and Simulation of Materials Synthesis: Chemcial Vapor Deposition and Infiltration of Pyrolytic Carbon
Numerical simulation of materials synthesis based on detailed models for the chemical kinetics and transport processes is expected to support development and optimization of production processes. Exemplarily, chemical vapor deposition and infiltration of pyrolytic carbon for the production of carbon fiber reinforced carbon is studied by recently developed modeling approaches and computational t...
متن کاملModelling of Pyrocarbon Chemical Vapor Infiltration
The chemical vapor infiltration (CVI) of pyrocarbon is used to produce carbon matrix of C/C composites. This process involves complex physico-chemical phenomena such as the transport of gas mixtures (hydrocarbons and hydrogen) in the reactor and inside the fibrous preform, chemical reactions (pyrolysis and deposition), and the structural evolution of the preform. A global modelling approach has...
متن کاملTransient modeling of chemical vapor infiltration ofmethane using multi-step reaction and depositionmodels
Based on multi-step reaction and deposition models including the hydrogen inhibition model of pyrocarbon growth, transient 2D simulations of chemical vapor infiltration of methane were carried out by a finite element method (FEM) coupling the mass transfer (by convection and diffusion) and the evolutive surface area model with gas-phase and surface chemical reactions. The continuous infiltratio...
متن کاملThe application of repro-modelling to pyrocarbon CVD/CVI homogeneous mechanisms for various hydrocarbons precursors
The pyrocarbon Chemical Vapor Infiltration (CVI) is a widespread process for the production of high-performance composite materials with applications in aerospace and braking technology. Several hundred species and thousands of elementary reactions may be required to describe comprehensively the gas-phase pyrolysis that occurs prior to pyrocarbon deposition. The repro-modelling technique is a w...
متن کاملCVD and CVI of pyrocarbon from various precursors
The control of pyrocarbon Chemical Vapor Infiltration (CVI) is a key issue in the processing of high-performance C/C composites with applications in aerospace parts and braking technology. For years, the precise investigation of deposition kinetics and pyrocarbon nanometer-scale anisotropy has been rehearsed in CVD and several variants of CVI with various pore sizes, and using mostly propane, p...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2011