Silicone polymer composites for thermal protection system: fiber reinforcements and microstructures

Abstract

A new class of silicone polymer matrix composites was evaluated using a simulated solid rocket motor test apparatus. Conversion of this organic silicone polymer to a ceramic (i.e. silica) structure on exposure to flame impingement or high temperature, accounts for its outstanding thermal stability. A research program was aimed to develop and evaluate this new class of thermal protection materials for military applications. This article presents the effects of the type and form of reinforcements on the thermal performance of a novel class of silicone polymer matrix composites. Reinforcement types such as glass, silica, quartz, Nextel^TM, and Nicalon^TM were used. Reinforcement forms such as random continuous-fiber mat, chopped-fiber mat, 2-D fabric, 3-D fabric, chopped roving, and broadgood tapes with different ply angles were tested. Detailed microstructural, mass loss, and peak erosion analyses were conducted on the phenolic-based matrix composite (control) and silicone-based matrix composites to understand their protective mechanisms.

Keywords

silicone polymer matrix composites phenolic polymer matrix composites thermal protection materials ablatives thermal protection systems

References

Koo JH , Ho DWK and Ezekoye OA A review of numerical and experimental characterization of thermal protection materials - Part I. Numerical modeling. AIAA Paper 2006-4936, 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference , Sacramento, CA, July 9-11, 2006.

Koo JH , Ho DWK , Bruns MC and Ezekoye OA A review of numerical and experimental characterization of thermal protection materials - Part II. Property characterization, AIAA Paper 2007-2131, 48th AIAA/ASME/ASCE/AHS Structures, Structural Dynamics, and Materials Conference, Honolulu, HI, April 23-26, 2007.

Koo JH , Ho DWK , Bruns MC and Ezekoye OA A review of numerical and experimental characterization of thermal protection materials - Part III. Experimental testing. AIAA Paper 2007-5773, 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference , Cincinnati, OH, July 8-11, 2007.

Yeh YP Studies of the two-phase plume jet and wall erosion in a vertical launching system. PhD Dissertation, Department of Mechanical Engineering , Pennsylvania State University, University Park, PA, 1990.

Yang BC , Cheung FB and Koo JH Numerical investigation of thermo-chemical and mechanical erosion of ablative materials. AIAA Paper 93-2045, 29th AIAA/SAE/ ASME/ASEE Joint Propulsion Conference, Monterey, CA, June 28-July 1, 1993.

Chaboki A. , Kneer MJ , Schneider ME and Koo JH Supersonic torch facility for ablative testing. AIAA Paper 90-1761, 5th AIAA/ASME Joint Thermophysics and Heat Transfer Conference , Seattle, WA, June 18-20, 1990.

Koo JH , Miller MJ , Lin S. and Schneider ME A cost-effective approach to evaluate high-temperature ablatives for military applications. Naval Eng J 1992; 104: 166-177.

Yang BC A theoretical study of thermomechanical erosion of high-temperature ablatives . PhD Dissertation, Department of Mechanical Engineering , Pennsylvania State University, University Park, PA, 1992.

Yang BC , Cheung FB and Koo JH Modeling of one-dimensional thermomechanical erosion of the high-temperature ablatives. Journal of Applied Mechanics 1993 ; 60: 1027-1032.

10.

Cheung FB , Yang BC , Burch RL and Koo JH Effect of melt-layer formulation and thermo-mechanical erosion of high-temperature ablative materials. Proc. Pacific International Conference on Aerospace Science and Technology, Vol. 1, National Cheng Kung University, Taiwan, December 6-9, 1993, pp.41-48.

11.

Lewis D. and Anderson L. Effects of melt-layer formation on ablative materials exposed to highly aluminized rocket motor plumes. AIAA Paper 98-0872, 36th AIAA Aerospace Sciences Meeting, Reno, NV, January 1998.

12.

York BJ , Sinha N. , Dash SM , Anderson LP , Gominho L. , Koo JH , et al. Steady/transient plume-launcher interactions and progress towards particulate/surface layer modeling. AIAA Paper 95-0255, 33rd AIAA Aerospace Sciences Meeting, Reno, NV , January 9-12, 1995.

13.

Shih YC Thermochemical ablation of high-temperature thermal insulation materials . PhD Dissertation, Department of Mechanical Engineering , Pennsylvania State University, University Park, PA , 1997.

14.

Shih YC and Cheung FB A numerical study of the thermal response of high-temperature ablative materials . Numer Heat Transfer, Part A 1997 ; 32(5): 555-574.

15.

Shih YC , Cheung FB , Koo JH and Yang BC Numerical study of transient thermal ablation of high-temperature insulation materials. J Thermophys Heat Transfer 2003 ; 17(1): 53-61.

16.

Henderson JB An analytical and experimental study of the pyrolysis of composite ablative materials. PhD Dissertation, Oklahoma State University , Stillwater, OK, 1980.

17.

Henderson JB , Tant MR , Moore GR and Wiebelt JA Determination of kinetic parameters for the thermal decomposition of phenolic ablative materials by a multiple heating rate method. Thermochim Acta 1981; 44: 253-264.

18.

Henderson JB An analytical and experimental study of the thermal behavior of polymer composites exposed to high temperature. Final Report submitted to the U.S. Navy Naval Surface Weapons Center, Dahlgren, VA ; Dept. of Mechanical Engineering and Applied Mechanics , University of Rhode Island, Kingston, RI, 1984.

19.

Henderson JB , Wiebelt JA and Tant MR A model for the thermal response of polymer composite materials with experimental verification. J Compos Mater 1985; 19: 579-595.

20.

Henderson JB and Tant MR Measurement of thermal and kinetic properties of a glass-filled polymer composite to high temperature. High Temp-High Press 1986; 18: 17-28.

21.

Henderson JB and Wiecek TE A mathematical model to predict the thermal response of decomposing, expanding polymer composites. J Compos Mater 1987; 21: 373-393.

22.

Henderson JB and Emmerich WD Measurement of the specific heat of a glass-filled polymer composite to high temperature. Thermochim Acta 1988; 131: 7-14.

23.

Henderson JB and Wiecek TE A numerical study of thermally induced response of decomposing, expanding polymer composites. Heat Mass Transfer 1988; 22: 275-284.

24.

Florio Jr J. , Henderson JB and Test FL Experimental determination of volumetric heat-transfer coefficients in decomposing polymer composites. American Society of Mechanical Engineers , New York , ASME Paper, 1989.

25.

Florio Jr J. , Henderson JB and Test FL Measurement of the thermochemical expansion of porous composite materials. High Temp-High Press 1989; 21: 157-165.

26.

Florio Jr J. , and Henderson JB Analytical investigation of the thermal response of decomposing polymer composites. J Thermophys Heat Trans 1990; 4(4): 485-492.

27.

Florio J. , Henderson JB , Test FL and Hariharan R. Characterization of forced convention heat transfer in decomposing, glass-filled polymer composites. J Compos Mater 1991; 25: 1515-1539.

28.

Boyer CT An analytical and experimental investigation of the thermophysical properties of a swelling, charring composite material. PhD Dissertation, Virginia Polytechnic Institute and State University, Blacksburg, VA, 1984.

29.

Wilson D. , Beckley DA and Koo JH Development of new materials for missile launch structures. JANNAF Propulsion Meeting, Monterey, CA, November 15-19, 1993.

30.

Miller MJ , Koo JH , Wilson D. and Beckley DA Effect of reinforcements in a silicone resin composite. AIAA Paper 94-0787 , 32nd AIAA Aerospace Sciences Meeting , Reno, NV, January 10-13, 1994.

31.

Koo JH , Miller MJ , Wilson D. and Beckley DA Performance envelope of a silicone polymer composite. 1994 International SAMPE Symposium and Exhibition, Vol. 39, Long Beach, CA, May 1994, pp.1576-1589.

32.

Miller MJ , Koo JH , Siebenshuh JR , Wilson D. and Beckley DA Development of a scaled ducted launcher for ablative testing. AIAA Paper 95-0256, 31st AIAA/ ASME/SAE/ASEE Joint Propulsion Conference, San Diego, CA, July 10-12, 1995.

33.

VanMeter ML , Koo JH , Wilson D. and Beckley DA Mechanical properties and material behavior of a glass silicone polymer composite. 1995 International SAMPE Symposium and Exhibition, Vol. 40, Long Beach, CA, May 1995, pp.1425-1434.

34.

Koo JH , Venumbaka S. , Miller MJ , Wilson D. , Beckley DA and Calamito D. Effects of major constituents on the performance of silicone polymer composite . 30th International SAMPE Technical Conference , San Antonio, TX, October 21-24, 1998 .

35.

Koo JH , Venumbaka S. , Miller MJ , Wilson J. , Beckley DA , Calamito D. , et al. Thermal performance of a class of silicone polymer composites . 1999 International SAMPE Symposium and Exhibition , Vol. 44, Long Beach, CA, May 23-27, 1999, pp.1431-1441.

36.

Koo JH , Venumbaka S. , Weispfenning J. and Blackmon C. Silicone matrix composites for thermal protection. 31st International SAMPE Technical Conference, Chicago, IL, October 27-31, 1999.

37.

Koo JH , Miller MJ , Weispfenning J. and Blackmon C. Silicone polymer composites for thermal protection system: fiber reinforcements, microstructures, and performance. AIAA Paper 2009-5274, 45th AIAA/ASME/SAE/ ASEE Joint Propulsion Conference, Denver, CO, August 2-5, 2009.

38.

Baney R. and Chandra G. Preceramic polymers. In: Concise encyclopedia of polymer science and engineering. New York: Wiley , 1990.

39.

Beckley DA and Sites J. U.S. Patent: Processable Silicone Composite Materials Having High Temperature Resistance, Patent No.: 5,552,466, September 3, 1996.

40.

Beckley DA and Sites J. U.S. Patent: Processable Silicone Composite Material Having High Temperature Resistance, Patent No.: 5,612,399, March 18, 1997.

41.

Koo JH , Miller MJ , Weispfenning J. and Blackmon C. Development and evaluation of silicone polymer composites for thermal protection system. J Spacecr Rockets 2010; under review.

42.

Koo JH , Stretz A. , Bray A. , Weispfenning J. , Luo ZP and Wootan W. Nanocomposites rocket ablative materials: processing, characterization, and performance. 2003 International SAMPE Symposium and Exhibition , Vol. 48, Long Beach, CA, May 11-15, 2003, pp.1156-1170.

43.

Koo JH , Pilato LA and Wissler GE Polymer nanostructured materials for propulsion systems. J Spacecr Rockets 2007; 44(6): 1250-1262.

44.

Koo JH and Pilato LA Thermal properties and microstructures of polymer nanostructured materials . In: Schulz MJ , Kelkar AD and Sundaresan MJ (eds) Nanoengineering of structural, functional, and smart materials. Boca Raton, FL: CRC Press, 2006, pp.409-441.