1.1 这些试验方法包括测定化学成分在以下范围内的氮化硅粉末中碳、氮和氧的质量分数百分比: 要素 质量分数%范围 碳 0.05至5.0 氮 30至45 氧气 0.1至1.5 1.2 本标准中有两种试验方法。 1.2.1 总碳量采用直接燃烧红外测量法。 1.2.2 氮气采用惰性气体熔融热导率测量方法，氧气采用惰性气体熔融红外测量方法。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 第节给出了具体的危险说明 6. . 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 3.1 这些测试方法用于对氮化硅粉末中碳、氮和氧的质量分数进行化学分析。它们用于研究、开发、生产、验收和质量控制氮化硅粉末，用于生产含氮化硅的陶瓷组件。 3.2 假设所有使用这些测试方法的人都是经过培训的分析员，能够熟练、安全地执行常见的实验室程序。 预计工作将在配备适当的实验室中进行。

1.1 These test methods cover the determination of mass fraction % of carbon, nitrogen, and oxygen in silicon nitride powder having chemical compositions within the following limits: Element Mass Fraction % Range Carbon 0.05 to 5.0 Nitrogen 30 to 45 Oxygen 0.1 to 1.5 1.2 Two test methods appear in this standard. 1.2.1 Total Carbon by the Direct Combustion-Infrared Measurement Method. 1.2.2 Nitrogen by the Inert Gas Fusion-Thermal Conductivity Measurement Method and Oxygen by the Inert Gas Fusion-Infrared Measurement Method. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Section 6 . 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 3.1 These test methods are for the chemical analysis of mass fraction of carbon, nitrogen, and oxygen in silicon nitride powder. They are used in research, development, production, acceptance, and quality control of silicon nitride powders used to produce ceramic components with silicon nitride content. 3.2 It is assumed that all who use these test methods will be trained analysts capable of performing common laboratory procedures skillfully and safely. It is expected that work will be performed in a properly equipped laboratory.