Browse Publications Technical Papers 2015-01-0713

The Use of Intumescent Coatings with Polymer Composites for High Temperature Automotive Applications 2015-01-0713

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.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Carbon Fiber Tape and Sheet Epoxy Resin Impregnated G 200 (1379) Tensile, 18.0 (124) Modulus, 120 (248)


View Details


Reclaimed Fiber Acoustical Composites - Addressing Today's Recycling Challenges


View Details


On the Injection Molding of Long Glass Fiber Filled Thermoplastic Test Specimens


View Details