The blackening treatment of U-shaped heating tubes generally involves several simple steps:

The blackening treatment of U-shaped heating tubes generally involves several simple steps:

1. What needs to be done is to clear the organic matter on the surface, which is called degreasing treatment. Everyone should rest assured that degreasing treatment is easy to achieve here. Defatting treatment only requires the presence of degreasing solution. And degreasing solution is also easily available on the market. The requirement for degreasing treatment is to maintain an extremely high alkalinity of the liquid, with a stable pH value of around 13. The time requirement is approximately 30 minutes. After this treatment, the surface should be cleaned to remove impurities generated by chemical reactions. Cleaning must be done with clean water to ensure a high level of cleanliness on the surface of the heating tube.

2. The prerequisite for blackening treatment is to keep the surface of the heating tube clean and tidy. If there are impurities on its surface, it will not be conducive to blackening treatment.

3. After completing the above three steps, it is necessary to ensure that the Ph is between 2-4. A time of 10 minutes is sufficient. After processing, proceed with cleaning.

5, Dry the heating tube. Drying is done to remove the water adhering to the surface of the heating tube. Finally, it's time to apply oil.

4. After alkaline washing, it needs to be pickled. Because its surface not only contains alkaline organic matter, but also acidic organic matter. So acidic cleaning is also necessary. A pH value of 3 is required for acidity, and the processing time should not exceed about 10 minutes.

The ultra-high temperature tungsten rhenium thermocouple has a single-layer protective tube structure, and the protective tube material used is tungsten tube or tantalum tube. Currently, there are very few domestic manufacturers of ultra-high temperature tungsten rhenium thermocouples, and there are also very few manufacturers researching ultra-high temperature protective tubes and insulation materials. The reason is that the industry share of ultra-high temperature tungsten rhenium thermocouples required in the field of ultra-high temperature measurement is small, the profit space is small, and the research difficulty and investment cost are too high, which causes many imported equipment to have difficulties in maintaining and purchasing this product. Purchasing this product from abroad has a long cycle and high price. The product has a sufficient safety factor for its usage temperature. Due to the hardness and brittleness of tungsten and tantalum protective tubes at room temperature in China, users need to fully consider the related uncertainties during installation to prevent damage to the protective tubes.

The temperature measurement range of the ultra-high temperature tungsten rhenium thermocouple is 0-2300 ℃, and the highest temperature of this product can reach 2600 ℃, making it the highest temperature measured tungsten rhenium thermocouple at home and abroad. However, the thermoelectric potential of the tungsten rhenium thermocouple is dispersed after exceeding 2300 ℃, which will affect the accuracy of temperature measurement. The ultra-high temperature tungsten rhenium thermocouples produced by our company use domestically produced tungsten or tantalum protective tubes, and utilize independently developed insulation materials that can withstand 2600 ℃ ultra-high temperature. After long-term use in the domestic ultra-high temperature industry, they have received satisfactory recognition in this industry.

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