Case study: Building an ultra-high-temperature mechanical testing system

janfeb13

Test  Frame  Test frame Induction coil  Induction  Coil EnvironmentalEnvironmental   chamberChamber   Uics (UHTCs), such as refrac--ltra-high-temperature ceram tory metal borides and carbides, are can- didate materials for use in the extreme Figure 1. Ultra-high-temperature mechanical- environments associated with hypersonic testing apparatus showing the environmental chamber, induction coil, and test frame. flight, scramjet engines, rocket propul- (Credit: Missouri S&T.) sion, and atmospheric re-entry.1 For example, zirconium diboride- and haf- Case study: didates for the sharp wing leading edges-nium diboride-based ceramics are can Building an ultra- where temperatures in excess of 2,000°Cof future hypersonic aerospace vehicles are predicted. The ability to test these high-temperature temperatures is an important step inmaterials near their expected service mechanical the upper test temperature for mosttheir continued development. However, testing system to about 1,500°C. As a result, little iscommercial testing systems is limited known about the mechanical behavior of UHTCs at temperatures relevant to the Shaklee, Jeremy Watts, Greg E. Hilmas, proposed applications.By Eric W. Neuman, Harlan J. Brown- and William G. Fahrenholtz The high-temperature testing lab in the Department of Materials Science and Engineering at Missouri University of Science and Technology recently added atmosphere- Missouri University of Science and Technology students and controlled mechanical testing capability for temperatures faculty designed an ultra-high-temperature test system for up to 2,600°C. Figure 1 shows the ultra-high-temperature atmosphere-controlled mechanical testing at temperatures test system, comprising a screw-driven universal test frame, custom-built environmental chamber, and an inductively up to 2,600°C. heated hot zone with a graphite susceptor; it can achieve heating rates as high as 500°C per minute. The environ- 36 www.ceramics.org | American Ceramic Society Bulletin, Vol. 92, No. 1


janfeb13
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