レーザ照射による気孔率の異なるホウ化チタンの熱衝撃強度評価(<小特集>先進材料と信頼性解析・評価)

概要

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Nuclear power plants have the greatest potential for use in space ships, underwater vehicles, and so on. It is very important to develop new radiation shielding materials which have excellent mechanical strength and heat-resistant characteristics. Titanium boride ceramic (TiB_2) is an excellent neutron absorber and has been investigated as a radiation shielding material. This report presents an evaluation of thermal shock resistance by the laser irradiation technique for three kinds of titanium boride ceramics with 3, 8, and 15% porosity. Their temperature and thermal stress distributions are analyzed by the finite-element method, and the relationship between the spot diameter of the laser beam and the maximum tensile thermal stress is derived for various power densities of the laser beams. Critical fracture curves are obtained from these relationships, which can specify a critical power density for a given laser beam spot diameter. The irradiation experiments are performed on titanium boride ceramics using a C0_2 laser. Finally, theoretical results are compared with experimental ones.
一般社団法人日本機械学会の論文
1995-09-25