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Shape memory alloy sealing gasket and production technology thereof

A technology for sealing gaskets and memory alloys, which is applied in flange connections, pipes/pipe joints/fittings, passing components, etc., can solve the problem that the stress-strain curve does not show a phase transition platform, and optimize the manufacturing process of unsealed gaskets Or in-depth research, performance impact and other issues to achieve the effect of ensuring long-term sealing effect, high pressure and prolonging the life of bolts

Inactive Publication Date: 2012-04-11
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This research result shows that NiTi alloy meets the requirements for use as a gasket in bolted flange connections. However, more researchers, such as Xu Zuyao, Huang Xuewen, Qian Shiqiang, Gall Ken, Liu Yong, Raghavendra R Adharapurapu, etc., It is found that the compression behavior of NiTi alloy may not be the same as the research results of Tatsuoka et al. The stress-strain curve of NiTi alloy during compression does not show an obvious phase transition plateau
At the same time, NiTi alloy as a shape memory material, its performance is greatly affected by thermal-mechanical treatment, and Tatsuoka et al. have not proposed optimization or in-depth research on the manufacturing process of NiTi shape memory alloy sealing gaskets

Method used

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  • Shape memory alloy sealing gasket and production technology thereof
  • Shape memory alloy sealing gasket and production technology thereof
  • Shape memory alloy sealing gasket and production technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The composition of the material in the present invention is as follows: Ni-58.25, Ti-41.45, Al-0.168, Cu-0.0256, V-0.106.

[0033] Production technology of the present invention is as follows:

[0034] (1) Prepare to be hot-rolled into a plate, the composition of the plate is as required above, and the thickness of the plate material is about 2mm;

[0035] (2) According to the size requirements of the gasket in the ASME B16.47 standard, cut the plate wire into a flat gasket with an inner diameter of 48mm and an outer diameter of 52.12mm, and grind both sides to 1.45mm;

[0036] (3) Solid solution treatment of the gasket: heat preservation at 850°C for 30 minutes;

[0037] (4) Perform superelastic training on the gasket, in which the aging temperature is 250°C and the duration is 60 minutes;

[0038] (5) Clean the surface of the gasket and put it into use.

Embodiment 2

[0040] The composition of the material in the present invention is as follows: Ni-58.25, Ti-41.45, Al-0.168, Cu-0.0256, V-0.106.

[0041] Production technology of the present invention is as follows:

[0042] (1) Prepare to be hot-rolled into a plate, the composition of the plate is as required above, and the thickness of the plate material is about 2mm;

[0043] (2) According to the size requirements of the gasket in the ASME B16.47 standard, cut the plate wire into a flat gasket with an inner diameter of 48mm and an outer diameter of 52.12mm, and grind both sides to 1.45mm;

[0044] (3) Solid solution treatment of the gasket: heat preservation at 850°C for 30 minutes;

[0045] (4) Perform superelastic training on the gasket, wherein the pre-deformation rate is 0.2%, the aging temperature is 250°C, and the duration is 180min;

[0046] (5) Clean the surface of the gasket and put it into use.

Embodiment 3

[0048] The composition of the material in the present invention is as follows: Ni-58.25, Ti-41.45, Al-0.168, Cu-0.0256, V-0.106.

[0049] Production technology of the present invention is as follows:

[0050] (1) Prepare to be hot-rolled into a plate, the composition of the plate is as required above, and the thickness of the plate material is about 2mm;

[0051] (2) According to the size requirements of the gasket in the ASME B16.47 standard, cut the plate wire into a flat gasket with an inner diameter of 48mm and an outer diameter of 52.12mm, and grind both sides to 1.45mm;

[0052] (3) Solid solution treatment of the gasket: heat preservation at 850°C for 30 minutes;

[0053] (4) Perform superelastic training on the gasket, in which the pre-deformation rate is 0.2%, the aging temperature is 400°C, and the duration is 60 minutes;

[0054] (5) Clean the surface of the gasket and put it into use.

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Abstract

The invention discloses a shape memory alloy sealing gasket. The sealing gasket is characterized in that the material comprises the following components in parts by weight: 53.25-58.42 parts of Ni, 41.63-45.82 parts of Ti, 0.1-0.2 part of Al, 0.01-0.03 part of Cu and 0.015-0.12 part of V. The shape memory alloy sealing gasket utilizes the superelasticity and shake-suction performance of the NiTi alloy and has the advantages of good compression elasticity, corrosion resistance, fatigue resistance, high pressure resistance and good safe reliability.

Description

technical field [0001] The invention relates to a shape memory alloy sealing gasket and a production process thereof. Background technique [0002] Gasket is the key element to maintain the sealing effect in the bolted flange connection. It is widely used in process industrial devices such as pressure vessels, process equipment, power machines and connecting pipelines. Its failure may have catastrophic consequences. . Polymer sealing gaskets are easy to age and cause stress relaxation after long-term use; ordinary stainless steel or aluminum sealing gaskets have a large elastic modulus, and the sealing effect is affected, and the bolts also show creep relaxation under long-term tension. The residual deformation of the metal gasket after the bolt is loosened cannot guarantee a reliable and effective sealing pressure. In recent years, domestic and foreign scientific and technological workers have conducted a lot of research on the selection of sealing gasket materials, and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03F16L23/20
Inventor 陆晓峰诸士春巩建鸣
Owner NANJING UNIV OF TECH
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