This content is not included in your SAE MOBILUS subscription, or you are not logged in.
The Use of Intumescent Coatings with Polymer Composites for High Temperature Automotive Applications
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2015 by SAE International in United States
Annotation ability available
To meet corporate CO2 emission targets polymer composites are being explored for light-weighting vehicle applications. Operational requirements may demand that such materials function above glass transition temperatures or heat deflection points. Intumescent coatings are traditionally used in construction to protect steelwork during fire. This paper presents a novel experimental investigation of two intumescent technologies to thermally protect a reinforced polyamide, for use as a semi-structural vehicle component.
Coatings were assessed against the thermal requirement to withstand 500°C for 10 minutes. The differences in performance observed between water and epoxy based coatings as well as when an insulation layer was introduced are reported.
Ultimate Tensile Stress (UTS) and modulus values were obtained at −40°C, ambient, and 85°C for uncoated specimens before and after thermal cycling. Results indicated although samples did not surpass the heat deflection point of the material (220°C), exceeding the glass transition temperature led to a reduction in mechanical properties.
Considering electrified vehicles it may be beneficial if materials are electrically resistant Therefore, the surface and through-thickness resistivity of uncoated and coated plaques was measured. The resistance of coated samples before and after thermal cycling exceeded the threshold of 1×106Ω, however, when coated samples were environmentally pre-conditioned, these materials failed to meet the required surface resistance.
There are a number of parameters that need to be understood: light-weighting, electrical resistance, thermal protection, and manufacturing demands for automotive structures; this work demonstrates the potential of selected intumescent coating technologies to provide a balance between the protection of composite performance while achieving light-weighting targets for high temperature automotive applications.
|Aerospace Material Specification||Carbon Fiber Tape and Sheet Epoxy Resin Impregnated G 200 (1379) Tensile, 18.0 (124) Modulus, 120 (248)|
|Technical Paper||Reclaimed Fiber Acoustical Composites - Addressing Today's Recycling Challenges|
|Technical Paper||On the Injection Molding of Long Glass Fiber Filled Thermoplastic Test Specimens|
CitationSimmonds, H., Cox, S., Nicholls, S., and Williams, G., "The Use of Intumescent Coatings with Polymer Composites for High Temperature Automotive Applications," SAE Technical Paper 2015-01-0713, 2015, https://doi.org/10.4271/2015-01-0713.
- Jiminez M. , S.D. , Bourbigot S Characterization of the performance of an intumescent fire protective coating Surface and Coatings Technology 201 979 987 2006
- Jimenez M. , S.D. , Bourbigot S Multiscale Experimental Approach for Developing High-Performance Intumescent Coatings Industrial Chemical Engineering Research 45 4500 4508 2006
- Jimenez M. , S.D. , Bourbigot S. Intumescent fire protective coating: Toward a better understanding of their mechanism of action Thermochimica 449 16 26 2006
- ISO527-4 Plastics - Determination of tensile properties Part 4: Test conditions for isotropic and othotropic fibre-reinforced plastic composites 1997
- BASF Corporation Mechanical Performance of Polyamides with Influence of Moisture and Temperature - Accurate Evaluation and Better Understanding 2003
- Silva L. , S.T. , Salgueiro W. Study of the water absorption and its influence on the Young's modulus in a commercial polyamide Polymer Testing 32 158 164 2013
- Merdas , I. et al. Factors governing water absorption by composite matrices Composites Science and Technology 62 4 487 492 2002
- Mouhmid B. , A.I. , Benseddiq N. , Benmedakhene S. , Maazouz A. A study of the mechanical behaviour of a glass fibre reinforced polyamide 6,6: Experimental investigation Polymer Testing 25 544 552 2006