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			Thermogravimetric analysis allows one to determine oxidation or reaction kinetics of materials such as ceramics, metals and polymers. The NASA GRC ThermogravimetricAnalysis (TGA) laboratory consists of four analog Cahn C-1000 microbalances, three Seteram TGA balances and two Cahn C-1000 digital microbalances each used in conjunction with a vertical tube furnace. The equipment allows one to continuously measure weight changes as low as one-tenth of a milligram. The furnaces have MoSi2 elements, allowing testing up to 1650 °C. The hot zone is ~5.0 cm long. Tube material is either fused quartz or high-purity alumina. Ordinarily, the furnace tube inner diameter is 2.5 cm, though 5.0 cm I.D. has been used. Nominal sample size is 2.5 x 1.2 x 0.3 cm. Samples are suspended from the microbalances with platinum or sapphire hooks. Unlike other TGAs using a fixed furnace in which the sample temperature is ramped, the GRC facility employs an elevator to raise the furnace around the sample. Because the furnace is already at the test temperature, the sample reaches the isothermal test temperature within 5 - 10 minutes. Usual furnace environment is oxygen or dry air, though mixed or inert gases can be used and also high-vacuum. Two of the TGAs allow testing in water-vapor, with up to 50% H2O - 50% O2 possible. Experimental data (time, weight, temperature) are acquired electronically. Data reduction with graphical output can be done quickly, using an in-house computer program.   Above: View of the Thermogravimetric Analysis Laboratory.   + Return to Branch Facilities Page For further information please contact Don Humphrey Structures & Materials Division Develops high temperature materials for aviation and space applications. + View site Research & Technology Directorate Develops and manages core competencies to deliver on the Center's programmatic commitments. + View site NASA Glenn Research Center Facilities Learn about the full range of available testing facilities. + View Site
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