ISO 20509:2003描述了测定非氧化物单片陶瓷（如氮化硅、sialon和碳化硅）在高温下抗氧化性的试验方法。本国际标准旨在评估试样在氧化气氛中高温氧化后的质量和尺寸变化，并评估氧化是否对后续强度有显著影响。本试验方法可用于材料开发、质量控制、表征和设计数据生成目的。

ISO 20509:2003 describes the method of test for determining the oxidation resistance of non-oxide monolithic ceramics, such as silicon nitride, sialon and silicon carbide at high temperatures. This International Standard is designed to provide an assessment of the mass and dimensional changes of test pieces following oxidation at high temperature in an oxidizing atmosphere, and to assess whether oxidation has a significant effect on the subsequent strength. This test method may be used for materials development, quality control, characterization, and design data generation purposes.