|New EERC-developed material to be tested on International Space Station|
The Energy & Environmental Research Center has delivered a suite of unique materials to NASA for testing on the International Space Station sometime during the summer of 2007. The materials, primarily comprising silicon carbide, which is extremely hard ceramic, could be used as meteorite and heat shield protection on the space shuttle and other spacecraft.
The EERC silicon carbide structures can withstand temperatures of 1450°C or more, which is much higher than other silicon carbide materials made in a similar manner. The ability to withstand these higher temperatures is critical during entry into space and reentry into the earth's atmosphere. This was a key issue in the 2003 Columbia Space Shuttle disaster.
"These unique materials are made through a process which produces a much higher-temperature and tougher product than similar commercial materials and can enhance the quality of key components on spacecraft, resulting in increased safety on future space missions," said EERC associate director for research Tom Erickson.
The EERC materials also have another unique feature that can make them more resistant to meteoroid penetration and usable for aerobreaking. Most currently available ceramic materials are prone to shattering upon impact by an object. The EERC materials are porous, which allows them to be combined with other materials, making them shatter-resistant.
"Because of their potential use on spacecraft, we will expose small sections of the materials to low-earth orbit during the Materials International Space Station Experiment 6 (MISSE-6) mission," said John Hurley, EERC senior research advisor and material inventor. "Four separate pieces of the material structures will be installed on each side of the space station for four to six months and undergo exposure to severe ultraviolet radiation and monoatomic oxygen," said Hurley.
Some other potential uses on board the space shuttle or the ISS include heat exchanger tubing, burner nozzles, turbine blades, and very high-temperature mechanical fasteners such as nuts and bolts. At lower temperatures, the material can be used for tough, dent-resistant coatings in power and industrial applications such as grinding and cutting of hard materials and in high-impact scenarios such as lightweight bullet-proof armor. These materials were initially developed to meet a unique need within the power industry.
"This is a wonderful example of a wide variety of spin off opportunities derived from activities at the EERC," said Director Gerald Groenewold. "The material work we do here is motivated by energy-related topics, but every research project and every technology developed here has other opportunities that go beyond the boundaries of the initial intended use," he said.
The materials will make approximately 2900 orbits and travel about 75 million miles around the Earth. The samples will return on a shuttle flight in late 2007 or early 2008.