Anti-oxidation device and method suitable for molybdenum-based alloy reaction kettle

Abstract

The invention discloses an anti-oxidation device and method suitable for a molybdenum-based alloy reaction kettle. The device comprises a transparent quartz sleeve and a sealing component, one end of the transparent quartz sleeve is an open end, and the other end is a semi-closed end; the sealing component comprises a first sealing body, a second sealing body and a third sealing body; the first sealing body is arranged at the opening end of the transparent quartz sleeve; the first sealing body is provided with an air inlet communicated with the inner cavity of the transparent quartz sleeve; one end of the second sealing body is detachably connected with the first sealing body, and the other end is fixed on the molybdenum-based alloy reaction kettle; the third sealing body is arranged between the first sealing body and the second sealing body; and the semi-closed end of the transparent quartz sleeve is provided with a temperature measuring hole and an exhaust hole. According to the device and method, contact between the molybdenum-based alloy high-temperature and high-pressure reaction kettle and air is reduced in a physical isolation mode, and the matrix structure and components of the molybdenum-based alloy reaction kettle are not changed; therefore, the device can maximize the physical properties of the molybdenum-based alloy material and promote the molybdenum-based alloy reaction kettle to realize the maximum temperature and pressure tolerance degree.

Description

technical field [0001] The invention belongs to the technical field of anti-oxidation of high-temperature and high-pressure reaction kettles, and in particular relates to an anti-oxidation device and method suitable for molybdenum-based alloy reaction kettles. Background technique [0002] High-temperature and high-pressure reactors are widely used in deep-sea deep-sea process simulation, medical mineral and material synthesis, chemical synthesis reactions, and biological growth and cultivation, and have important industrial and scientific uses. The temperature and pressure that the high temperature and high pressure reactor can withstand are limited by the material and design. At present, the commonly used reactor materials are mostly stainless steel, titanium alloy and nickel-based alloy. Limited by materials, these reactors can usually only be used under the temperature and pressure conditions of 900°C and below 200MPa, which limits their application range and applicatio...

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Problems solved by technology

[0005] Generally speaking, many exploratory researches and applications have been carried out on the surface modification of molybdenum and molybdenum alloys for high-temperature applications at home and abroad, but there are still the following problems: 1) The surface modification coating system is relatively single, resulting in weak coating functions. It is difficult to simultaneously meet the needs of molybdenum and molybdenum alloys in high-temperature applications for oxidation resistance, ablation resistance, wear resistance, and strong acid and strong alkali resistance; 2) Due to the direct contact between the coating and the molybdenum substrate, the diffusion between elements destroys the structure of the base metal , and the thermal expansion coefficient does not match, which limits the relevant practical applications; 3) The structure of the existing surface modified coating is unstable, and the bonding ability with the molybdenum metal substrate is poor after a period of use, the problem of thermal shock resistance is prominent, and the service life is limited; 4 ) Most of the existing surface modification coating technology research is carried out in the laboratory, the coating preparation process is complicated, the cost is relatively high, and it is difficult to realize industrialization, large-scale production and practical application

As mentioned above, a transition layer caused by component diffusion is usually formed between the molybdenum and molybdenum alloy surface modification coating and the substrate, which destroys the physical structure of the substrate alloy, which will undoubtedly affect the yield strength and tensile strength of the molybdenum-based alloy. Strength, which affects the upper limit of the pressure resistance and safety of the molybdenum-based alloy reactor, which in turn limits the practical application of the molybdenum-based alloy reactor

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