An acidic filling material for fast temperature measuring elements that is not easy to regress

Abstract

The invention discloses a quick temperature measurement component acidic stuffing with low moisture regaining possibility. The stuffing is prepared from a solid material and a liquid material in a weight part ratio of 1:3 through steps of stirring, pouring, standing and roasting. The liquid material is prepared by mixing 0.9-1.1 parts of light magnesium oxide, 4.5-5 parts of water and 5.3-5.6 parts of phosphoric acid; the solid material is prepared by mixing 0.96-1.2 parts of magnesite with magnesium content of 94-98% and 3.8-4.5 parts of aluminum oxide. The invention further provides a pouring method of the acidic stuffing. The acidic stuffing and an alkaline material are placed in environments with the same humidity for 1-12 month; according to observation, the hygroscopic velocity of the acidic stuffing is slower than that of the alkaline material. The insulativity of the stuffing is equivalent to that of a thermocouple of the alkaline material, and the stability and controllability are very good. The influence of environmental temperature and humidity on the acidic stuffing disclosed by the invention is not great; compared with the alkaline material, the quick temperature measurement component acidic stuffing has the advantage that the cost is greatly lowered.

Description

technical field [0001] The invention relates to a fast temperature-measuring element filling material, in particular to an acidic thermocouple filling material which is not easy to return to moisture and has low cost, which can be used as a high-temperature sensor and a fast temperature-measuring element as an insulating material. Background technique [0002] In the process of metal smelting, the parts of the temperature measuring end that use thermocouples to measure temperature must be filled with fillers with good insulation and heat insulation, otherwise, temperature measurement deviation will be formed due to short circuit of hot electrodes and fast heat transfer. The thermocouple filler is commonly known as quick-drying cement, which plays the role of fixing the working wire support and heat insulation, and is an important part of the thermocouple temperature measurement stability. [0003] Since the use of thermocouples in China, the filling materials of thermocouple...

AI Technical Summary

Problems solved by technology

For example, the invention patent 201110073077.8 discloses a kind of early-strength and quick-drying refractory mud filler with good insulation properties, which can solve the problems of fast moisture absorption and decreased insulation of thermocouples

However, this type of alkaline material quickly exposed problems in actual use: (1) Since the alkaline material is a water-based castable, when it is dry, as the water evaporates, the filler tends to shrink when it dries, making the filling The precious metal wire in the alkaline material is easy to be pulled and broken, and cracks are prone to appear after drying. When the temperature is measured, the temperature increases sharply due to immersion in molten steel, which will cause the final temperature of the thermocouple to lock.

(3) The composition of the alkaline material is complex and the raw materials are more expensive. The cost of filling the same volume of alkaline material is more than 2.5 times the cost of acidic material

Many disposable thermocouples are used in the temperature measurement of molten steel, and the annual consumption is a considerable value. In the pursuit of lower steel production costs, alkaline fillers bring a greater burden

[0005] The traditional acidic materials existing in the prior art are greatly affected by air humidity and are easily dampened, resulting in a decrease in the insulation of the thermocouple and affecting the accuracy of the thermocouple in temperature measurement.

Alkaline materials tend to shrink when they are dry, which makes the metal wires filled in the alkaline materials easy to break and the fillers are prone to cracks after drying; it is easy to burst when measuring the temperature of molten steel; the composition is complex and the raw materials are expensive, etc.

It can be said that alkaline materials use complex processes and high costs to solve the problem of inaccurate and non-durable thermocouple temperature measurement