窒化物, 炭化物および酸化物セラミックスの高温高圧水中における材質劣化

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タイトル別名
  • Degradation of Nitride, Carbide and Oxide Ceramics Materials in High Temperature Aqueous Solutions
  • チツカブツ タンカブツ オヨビ サンカブツ セラミックス ノ コウオン コウア

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Corrosion characteristics of SiC, Si3N4, Al2O3, and ZrO2 ceramics materials prepared by different sintering methods have been studied in high purity water at 200°-330°C, in 0.1kmol·m-3 H2SO4 and 0.1kmol·m-3 LiOH at 300°C for 50h. The mass, the reflection spectrum, the surface roughness, the IR spectrum, and the X-ray diffraction have been measured on each material before and after the corrosion tests in order to examine changes in the quality of the materials. It has been found that SiC had excellent corrosion resistance in all solutions at all temperatures tested. Si3N4 was seriously attacked by high purity water at 300°C, resulting thick powdered corrosion products on its surface. The attack was much severer in high purity water at 330°C and in 0.1kmol·m-3 H2SO4 at 300°C. Al2O3 showed good corrosion resistance in high purity water up to 330°C. It was, however, seriously attacked in 0.1kmol·m-3 H2SO4 and 0.1kmol·m-3 LiOH at 300°C. The partially stabilized ZrO2 was often suffered from serious cracking or breaking in all the solutions at 300°C. The transformation from the tetragonal phase to the monoclinic phase, which occured on it during corrosion tests, was thought to be one of the causes of the cracking or the breaking.

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