Abstract
In order to apply ceramic materials for cryogenic components, the bending test method at cryogenic temperatures was developed. For the purpose of tests by three-point bending, methods of holding the specimens with springs in cryogen and centering the loading rod in the cryostat were developed. Using turret disk type cryogenic tensile apparatus, bending tests with alumina specimens were conducted at 293, 77 and 4 K. The tests showed that the average bending strength increases linearly with decreasing temperature and Weibull modulus was largest at 77 K. The average bending strength ratio of 4 K to 293 K was found to be approximately 1.5, which is generally smaller than the tensile strength ratio of metallic materials.
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