Chemical vapor infiltration of pyrocarbon from propene into model capillaries

TANG Zhe-peng; LI Ai-jun; LI Zhao-qian; PENG Yu-qing

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Article Navigation > New Carbon Mater. > 2017 > 32(5): 434-441

TANG Zhe-peng, LI Ai-jun, LI Zhao-qian, PENG Yu-qing. Chemical vapor infiltration of pyrocarbon from propene into model capillaries. New Carbon Mater., 2017, 32(5): 434-441.

Citation:

TANG Zhe-peng, LI Ai-jun, LI Zhao-qian, PENG Yu-qing. Chemical vapor infiltration of pyrocarbon from propene into model capillaries. New Carbon Mater., 2017, 32(5): 434-441.

TANG Zhe-peng, LI Ai-jun, LI Zhao-qian, PENG Yu-qing. Chemical vapor infiltration of pyrocarbon from propene into model capillaries. New Carbon Mater., 2017, 32(5): 434-441.

Citation:

TANG Zhe-peng, LI Ai-jun, LI Zhao-qian, PENG Yu-qing. Chemical vapor infiltration of pyrocarbon from propene into model capillaries. New Carbon Mater., 2017, 32(5): 434-441.

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Chemical vapor infiltration of pyrocarbon from propene into model capillaries

1.
School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;
2.
Shanghai Aerospace Equipment Manufacturer, Shanghai 200245, China

Funds: Doctoral Fund of Ministry of Education (20113108120019); Shanghai talent development fund (2011028); Aviation fund (2013ZFS6001); Shanghai Committee of Science and Technology (13521101202).

Received Date: 2017-07-08
Accepted Date: 2017-11-13
Rev Recd Date: 2017-10-09
Publish Date: 2017-10-28

Abstract

Abstract

7 dead-end parallel capillaries 1.0 mm in diameter, 31.0 mm in length and 10 mm separation were aligned perpendicular to the axis of a gas conducting tube and infiltrated at 1 223 K and 40 kPa (N₂:C₃H₆=9:1) for 75 h with a gas residence time of 0.56 s within the tube. The thickness of the pyrocarbon layers produced was determined along each capillary at 15h intervals. Results indicate that the pyrocarbon deposition rate decreases from the mouth to the end of the capillaries and the rate gradients are lower in the capillaries nearer to the gas inlet. Pyrocarbon deposition in the capillaries was simulated by a deposition model using the lumped reaction mechanism. The gas composition in the capillary mouths was obtained from computation by assuming that gas-phase reactions are homogeneous and the tube is a plug flow reactor. The calculated deposition rate profiles agree well with the experimental ones. Both the experimental and theoretical results indicate that pore blockage is relieved by reducing the gas residence time within the conducting tube.
- Pyrocarbon,
- Propene,
- Chemical Vapor Infiltration,
- Capillary,
- Modeling

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References(28)

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