论文部分内容阅读
建立了包括银点容器、高精度定点炉、微型机炉温群控与数据采集系统和真空充氩系统等在内的整套复现银凝固点的装置。用这套装置分度高温铂电阻温度计的复现性(标准偏差)为±1.3mK。对不同纯度的银样品的液相点温度进行了比较,纯度为99.999％的银的液相点温度比纯度为99.9999％的银低6.8mK,两个不同来源名义纯度均为99.999％的银样品的液相点温度之差小于1mK。用四支温度计考察了银凝固点的长期稳定性,年变化均不超过2.2mK。对银固、液两相平衡温度的压力系数进行了测量,结果为5.8mK/atm。大量实验数据表明,高温铂电阻温度计在银凝固点温度的稳定性很好,现有的高温铂电阻温度计就可以代替铂10％铑-铂热电偶作为实用温标630.74℃以上的内插仪器,其上限至少可达银凝固点。
Established a set of devices including silver point container, high precision fixed point furnace, micro-furnace temperature group control and data acquisition system and vacuum argon filling system, etc. The repeatability (standard deviation) of the high-temperature platinum resistance thermometer with this device is ± 1.3 mK. The liquidus temperature of silver samples with different purity were compared. The liquidus temperature of silver with 99.999% purity was 6.8mK lower than that of silver with purity of 99.9999%. Two silver samples with nominal purity of 99.999% from different sources The liquid point temperature difference is less than 1mK. Four thermometers were used to investigate the long-term stability of silver freezing point, with annual variations not exceeding 2.2 mK. The pressure coefficient of silver solid-liquid equilibrium temperature was measured and the result was 5.8mK / atm. A large number of experimental data show that the stability of the high temperature platinum resistance thermometer at the freezing point of silver is very good. The existing high temperature platinum resistance thermometer can replace the platinum 10% rhodium-platinum thermocouple as an interpolation instrument with a practical temperature scale above 630.74 DEG C and the upper limit At least up to silver freezing point.