The Coefficients of Thermal Expansion of La2O3, TaVO5 and Ta16W18O94 Below Room Temperature

[+] Author and Article Information
C. N. Chu, N. Saka, N. P. Suh

Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Eng. Mater. Technol 108(3), 275-277 (Jul 01, 1986) (3 pages) doi:10.1115/1.3225881 History: Received June 03, 1985; Online September 15, 2009


The coefficients of thermal expansion (CTE) of La2 O3 , TaVO5 and Ta16 W18 O94 were measured in the temperature range 150–300 K for space applications. Hot pressed La2 O3 showed a positive CTE of 8.6 × 10−6 K−1 . Sintered TaVO5 had a positive and extraordinarily large CTE (50 × 10−6 K−1 ), but the CTE was negative (−4.0 × 10−6 K−1 ) in the temperature range 340–380 K. The thermal expansion data suggest a reversible phase transformation near 260 K. The CTE of hot pressed Ta16 W18 O94 was −1.52 × 10−6 K−1 . Sintered Ta16 W18 O94 showed slight hysteresis, but the CTE was about −1.0 × 10−6 K−1 .

Copyright © 1986 by ASME
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