Mercury-free liquid alloy applied to thermometer, and thermometer

Abstract

The invention relates to a measuring medium applied to a glass thermometer, in particular to mercury-free liquid alloy applied to a thermometer, and the thermometer. The mercury-free liquid alloy applied to the thermometer comprises the following substances in parts by weight: 60.35 to 75.86 parts of gallium, 15.25 to 22.36 parts of indium, 3.56 to 8.27 parts of bismuth, 1.56 to 6.35 parts of tin,0.056 to 0.12 part of zinc, 0.002 to 0.008 part of silver and 0.001 to 0.005 part of niobium. The mercury-free liquid alloy provided by the invention adopts a liquid metal to replace the conventionalliquid mercury in order to reduce harms and improve the safety of the thermometer; moreover, the liquid alloy provided by the invention is good in mobility, has large changes in volume with the change of temperature within a range from 5 to 45 DEG C, and is good in temperature measurement sensitivity.

Description

technical field [0001] The invention relates to a measuring medium for a glass thermometer, in particular to a mercury-free liquid alloy for a thermometer and the thermometer. Background technique [0002] At present, most of the medical thermometers used to measure human body temperature or animal body temperature are glass thermometers, and mercury as a temperature carrier thermometer will volatilize at a temperature above 17t, whether it is in the production process of the glass thermometer or in its use. When damaged during the process, it will cause harm to human health. Because the use of highly toxic mercury will harm the environment and the human body, the use outside the mouth has been restricted. Therefore, mercury-free thermometers have broad application prospects. [0003] Now both at home and abroad are committed to developing mercury-free thermometers, but the liquid alloy carrier that can effectively replace mercury is a major technical key. The Chinese pat...

AI Technical Summary

Problems solved by technology

But they're still not stable enough to stay liquid

When the temperature is low (such as lower than 5°C) or the composition fluctuates, it is easy to produce deflection and crystallization, and the liquid is in a viscous state, which affects the temperature measurement of the temperature carrier

On the other hand, the expensive In content in these alloys is too high, and some also contain precious metals such as Cs and Rb, which causes the price of the liquid alloy to be too high, affects the cost of the thermometer, and becomes a serious problem for the promotion and application of mercury-free thermometers. Constraints

[0005] In addition, due to the difference in surface tension between the liquid alloy and mercury, the adsorption force between them and the glass tube wall is also significantly greater than that between mercury and the tube wall. Reply, affect the free flow of body fluid alloy up and down through the necking structure

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