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Journal of Aerospace Technology and Management

Print version ISSN 1984-9648On-line version ISSN 2175-9146

J. Aerosp. Technol. Manag. vol.1 no.1 São José dos Campos Jan./June 2009 


Ablative and mechanical properties of quartz phenolic composites

Maria L. Gregori1  * 

Edson A. Barros2 

Gilberto P. Filho3 

Luiz Cláudio Pardini4 

Sonia F. Costa5 

1Institute of Aeronautics and Space, São José dos Campos - Brazil.

2Technological Institute of Aeronautics, São José dos Campos - Brazil.

3Technological Institute of Aeronautics, São José dos Campos - Brazil.

4Institute of Aeronautics and Space, São José dos Campos - Brazil.

5Institute of Aeronautics and Space, São José dos Campos - Brazil.


Quartz phenolic composites have been applied to thermal protection systems (TPSs) for reentry vehicles since the late fifties due to their excellent ablative resistance and mechanical performance. TPSs must withstand the aggressive reentry environment, such as atomic oxygen, when submitted to very high temperatures (> 1000° C) and heat flux. The ablative performance of composites is influenced by both base materiais and environmental parameters during the ablation process.

For TPS systems phenolic resin is usually used as the base matrix due to its ability to form a stable char during decomposition. This charplays an important role in the absorption of the heat generated during the ablation process. During re-entry, parts of the charred matrix can be abrasively removed by shear force due to high pressure and velocity.

In this work the ablative and mechanical properties of quartz phenolic composites were evaluated in order to identify the range of properties suitable for the use of these materiais as thermal protection systems for space vehicles. Quartz fabric having an areai weight of 680 g/m2 and a resole-typephenolic resin were used to prepare the composites. The resin has a viscosity of l65 MPa at 20°C. The prepreg material was cured by heating under pressure of 100 bar in a mold. The resin content of the prepreg obtained was about 50 per cent. The mechanical properties evaluated were, tensile, shear and flexural strength. The results obtained showed that this material has average values of 38.5 MPa, 52 MPa and 85 MPa for tensile, shear andflexural strength, respectively.

The ablative tests were carried out in a high-energy air plasma in ambient atmosphere and the mass losses were measured for different exposure time.

Key words: Ablation; Quartzphenolic; Mechanical properties; Thermal protection systems

Full text is available only in PDF.


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Received: April 27, 2009; Accepted: May 25, 2009

*author for correspondence

Creative Commons License This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.