Manufacturing method of fixed-point furnace metal fixed-point bottle

Abstract

The invention discloses a manufacturing method of a fixed-point furnace gold fixed-point bottle. The manufacturing method comprises the following steps: adding a first batch of high-purity gold raw materials into a quartz bottle; vacuumizing the quartz bottle to a set condition, and then filling argon into the quartz bottle; heating and melting the quartz bottle in a fixed-point furnace; after thehigh-purity gold raw material is completely melted, stopping heating and completely cooling; adding a second batch of high-purity gold raw materials into the quartz bottle, repeating the steps, completely melting all the high-purity molten gold raw materials, and cooling; carrying out heating in the fixed-point furnace to obtain a melting temperature plateau of high-purity gold; cooling the fixed-point furnace to obtain a solidification temperature plateau of the high-purity gold; comparing the melting temperature plateau and the solidification temperature plateau with the melting point 1064.18 DEG C of the high-purity gold, and adjusting the pressure of Ar gas in the fixed point bottle to 1 standard atmospheric pressure; finally, sealing the quartz bottle, and completing manufacturing ofthe high-purity gold fixed-point bottle. According to the manufacturing method of the fixed-point furnace gold fixed-point bottle, the service life of the fixed-point bottle used for temperature calibration at 1000 DEG C is effectively prolonged, and the calibration accuracy is improved.

Description

technical field [0001] The invention relates to the field of thermal measurement, in particular to a method for manufacturing a fixed-point furnace gold fixed-point bottle. Background technique [0002] In the fields of temperature measurement calibration and other fields, the verification of thermocouples is carried out by comparison method in domestic general industrial production. At the specified temperature point, R, S, and B thermocouples are compared with standard thermocouples for calibration and comparison of thermoelectric potential values. The specified temperature points are generally three points of Zn, Al, and Cu (Au). Because the measurement accuracy of standard thermocouples will become lower and lower during use, so with the development of science and technology, more and more enterprises and measurement units begin to use fixed points for calibration, which can rule out the fact that the standard thermocouple in the comparison method Even the deviation bro...

AI Technical Summary

Problems solved by technology

When selecting a fixed point for verification, the international temperature scale ITS90 is at 1000°C, and the defined temperature fixed points include Cu (1084.62°C) and Au (1064.18°C). However, all fixed point equipment suppliers on the market now only provide Fixed-point vials for Cu dots

This is mainly due to the large price difference between Au and Cu, but because Cu is more likely to be oxidized than Au, the life of Cu fixed-point bottles is much shorter than that of Au fixed-point bottles

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