Protective sleeve of high-temperature thermocouple for sintering

Abstract

The invention relates to the field of iron ore sintering, in particular to a temperature measurement member for sintering. A protective sleeve of a high-temperature thermocouple for sintering is characterized by being prepared by the following steps of sintering the following raw materials by mass percent: 50%-55% of MgO, 15%-20% of Al2O3, 5%-10% of Mo, 4%-8% of TiO2, 4%-8% of Cr2O3, 2%-5% of ZrO2 and 1%-4% of Cr in a mixing mode, evenly mixing the raw materials, adding bonders 1%-3% of the total mass of the mixed raw materials into the mixture, evenly mixing the mixture, filling a mould with the mixture to perform compression moulding, performing demoulding after standing in the mould for a period time, standing for a certain time, putting the mixture in a kiln and baking the mixture for six to eight hours at the 1430 DEG C-1460 DEG C. When testing the temperature of a sinter bed, the protective sleeve can resist corrosion of oxidation and high-temperature fused solution, heat shock resistance, heat-conducting property and mechanical strength can be improved simultaneously, and therefore, temperature changes of the sinter bed can be measured accurately.

Description

technical field [0001] The invention relates to the field of iron ore sintering, in particular to a temperature measuring component for sintering. Background technique [0002] Thermocouples are the most widely used temperature sensing elements in the fields of industrial production and scientific research. It has formed a development trend from point to line, from line to surface, from surface to interior, from wired to wireless. The material properties of the thermocouple protection sleeve affect various performance indicators such as the long-term stability and service life of the thermocouple. Thermocouples working at high temperatures have stricter requirements for their casing materials. During the iron ore sintering production process, the internal temperature distribution of the material layer on the belt sintering machine trolley has an important influence on the sintering process. The temperature distribution of the material layer will affect the uniformity and ...

AI Technical Summary

Problems solved by technology

When testing the temperature of the sintered material layer, the thermocouple is in the oxidizing atmosphere for a long time, and the use of this protective sleeve is prone to serious corrosion, and the accuracy of the test data is likely to decrease during the damage of the thermocouple

Although the commonly used alumina protective sleeve has good corrosion resistance, its thermal shock resistance is poor, and the shrinkage of the material layer during the sintering process can easily lead to rupture and damage of the protective sleeve, so that the lower temperature air inside the sintered material layer into the protective casing, which also reduces the accuracy of the temperature test

However, the sleeve made of graphite is also difficult to be used in the temperature test process of the sintered layer due to its resistance to oxidation.

At the same time, the high-temperature molten liquid phase generated during the sintering process will also cause erosion and damage to the thermocouple protection sleeve made of the above materials

[0004] Therefore, the existing thermocouple protection sleeve cannot meet the actual needs of accurately measuring the temperature of the sintered material layer during the sintering process because it cannot solve the problems of good thermal conductivity and oxidation corrosion resistance at the same time.

Images