A high-performance low-temperature getter and its preparation method and application

Abstract

The invention relates to a high-performance low-temperature getter and a preparation method and application thereof. The high-performance low-temperature getter comprises the following components: AlOY.SiOX microporous powder, light rare earth, iron ore powder and a binder, wherein the weight ratio of AlOY.SiOX microporous powder to light rare earth to iron ore powder to the binder is (60-95):(0.2-2):(1-50):(5-20). According to the high-performance low-temperature getter, time spent in a high-vacuum interlayer acquisition process of a vacuum multi-layer heat-insulated low-temperature container is effectively shortened, the interlayer vacuum life is greatly prolonged, and the high-performance low-temperature getter is an effective method for solving technological difficulties in manufacturing the vacuum multi-layer heat-insulated low-temperature container, and also is a key breakthrough in lowering the container manufacture and use costs and quickening finish of upgrading and updating of the low-temperature storage and transport container; and the advent of the high-performance low-temperature getter can lead the manufacture technology of the vacuum multi-layer heat-insulated low-temperature container to enter a new era, and the new generation of the vacuum multi-layer heat-insulated low-temperature liquid storage and transport container with the characteristics of low cost, energy saving, cost reduction and environmental friendliness is created.

Description

technical field

[0001] The invention belongs to the technical field of cryogenic equipment manufacturing, and in particular relates to a high-performance low-temperature getter and its preparation method and application. Background technique

[0002] High-vacuum multi-layer insulation is a form of insulation in which many radiation shields (metal films with high reflectivity) are installed in the vacuum interlayer to reduce radiation heat transfer. The insulation space is evacuated to a negative pressure below 10Pa. It is the most efficient form of heat insulation, known as "super heat insulation". The main factors affecting the performance of multilayer insulation are: the material used, the degree of vacuum in the multilayer, the layer density and tightness of the multilayer, the total number of layers or the total thickness of the multilayer, and the mechanical load and boundary of the multilayer insulation. temperature and so on.

[0003] Cryogenic liquid storage and t...

Examples

Embodiment 1

[0027] A novel high-performance low-temperature getter, each component of the getter is composed of the following parts by weight: AlO Y ·SiO2 X Microporous powder (kaolin) 90 parts, neodymium oxide 1 part, hematite powder 30 parts, silicon oxide binder 12 parts;

[0028] Mix and granulate the raw materials; roast at 800°C for 4 hours;

[0029] Immerse the roasted φ3~φ5mm particles in a sodium hydroxide solution with a mass concentration of 15% for alkali treatment and washing; use 10% CaCl 2 solution for Ca 2+ Exchange and wash; after drying, the granular product is subjected to secondary roasting at 500°C to obtain low-temperature getter coarse material;

[0030] Put the low-temperature getter coarse material into the sealed chamber for kerosene gas-phase drying and pressure-swing passivation: evacuate the sealed chamber to 700Pa, heat the kerosene evaporator to 90°C; raise the temperature of the sealed chamber to 135°C, and perform 2 intermediate depressurizations , the...

Embodiment 2

[0033] The cryogenic getter 50kg preserved in the nitrogen of embodiment 1 is packed to -20m 3 In the interlayer of the cryogenic container, the effective volume of the interlayer is 6m 3 , when the interlayer pressure at room temperature is stable at 17Pa, add liquid nitrogen to the inner container (90% full rate), and the residual gas volume in the interlayer before filling the container with cryogenic liquid is 102Pa·m 3 , after 24 hours, the interlayer pressure reached a stable level, and the low temperature pressure of the interlayer was measured to be 4.8×10 -3 Pa.

Embodiment 3

[0035] The cryogenic getter 50kg preserved in the nitrogen of embodiment 1 is packed to -31m 3 In the interlayer of the cryogenic container, the effective volume of the interlayer is 7m 3 When the interlayer pressure at room temperature is stable at 362Pa, add liquid nitrogen to the inner container (90% full rate), and the residual gas volume in the interlayer before filling with low-temperature liquid is 2534Pa·m 3 , after 46 hours, the interlayer pressure reached a stable level, and the low-temperature pressure of the interlayer was measured to be 1×10 - 2 Pa.

technical field

[0001] The invention belongs to the technical field of cryogenic equipment manufacturing, and in particular relates to a high-performance low-temperature getter and its preparation method and application. Background technique

[0002] High-vacuum multi-layer insulation is a form of insulation in which many radiation shields (metal films with high reflectivity) are installed in the vacuum interlayer to reduce radiation heat transfer. The insulation space is evacuated to a negative pressure below 10Pa. It is the most efficient form of heat insulation, known as "super heat insulation". The main factors affecting the performance of multilayer insulation are: the material used, the degree of vacuum in the multilayer, the layer density and tightness of the multilayer, the total number of layers or the total thickness of the multilayer, and the mechanical load and boundary of the multilayer insulation. temperature and so on.

[0003] Cryogenic liquid storage and t...

Examples

Embodiment 1

[0027] A novel high-performance low-temperature getter, each component of the getter is composed of the following parts by weight: AlO Y ·SiO2 X Microporous powder (kaolin) 90 parts, neodymium oxide 1 part, hematite powder 30 parts, silicon oxide binder 12 parts;

[0028] Mix and granulate the raw materials; roast at 800°C for 4 hours;

[0029] Immerse the roasted φ3~φ5mm particles in a sodium hydroxide solution with a mass concentration of 15% for alkali treatment and washing; use 10% CaCl 2 solution for Ca 2+ Exchange and wash; after drying, the granular product is subjected to secondary roasting at 500°C to obtain low-temperature getter coarse material;

[0030] Put the low-temperature getter coarse material into the sealed chamber for kerosene gas-phase drying and pressure-swing passivation: evacuate the sealed chamber to 700Pa, heat the kerosene evaporator to 90°C; raise the temperature of the sealed chamber to 135°C, and perform 2 intermediate depressurizations , the...

Embodiment 2

[0033] The cryogenic getter 50kg preserved in the nitrogen of embodiment 1 is packed to -20m 3 In the interlayer of the cryogenic container, the effective volume of the interlayer is 6m 3 , when the interlayer pressure at room temperature is stable at 17Pa, add liquid nitrogen to the inner container (90% full rate), and the residual gas volume in the interlayer before filling the container with cryogenic liquid is 102Pa·m 3 , after 24 hours, the interlayer pressure reached a stable level, and the low temperature pressure of the interlayer was measured to be 4.8×10 -3 Pa.

Embodiment 3

[0035] The cryogenic getter 50kg preserved in the nitrogen of embodiment 1 is packed to -31m 3 In the interlayer of the cryogenic container, the effective volume of the interlayer is 7m 3 When the interlayer pressure at room temperature is stable at 362Pa, add liquid nitrogen to the inner container (90% full rate), and the residual gas volume in the interlayer before filling with low-temperature liquid is 2534Pa·m 3 , after 46 hours, the interlayer pressure reached a stable level, and the low-temperature pressure of the interlayer was measured to be 1×10 - 2 Pa.

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