Micro grain titanium-nickel-palladium-base high-temperature shape memory alloy preparing method

A memory alloy and micro-crystal technology, which is applied in the field of metal materials and metallurgy, can solve the problems of poor plasticity at room temperature and achieve the effects of improving mechanical properties, reducing sliding friction resistance, and reducing costs

Inactive Publication Date: 2005-11-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor plasticity of titanium-nickel-palladium-based shape-memory alloy at room temperature, improve its mechanical properties, and reduce high temperature at the same time. Reduce the cost of shape memory alloy processing and increase its yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The raw materials are equipped with 50% titanium, 20% palladium and 30% nickel by atomic percentage. Under the protection of argon, they are melted by vacuum magnetic levitation induction method in a cold-walled copper crucible to make titanium-nickel-palladium alloy ingots. The mass of each ingot is about 90 grams. Wire-cut the titanium-nickel-palladium alloy block material into a billet with a cross-section of 9.3×9.3mm and a length of 87mm. The surface treatment of the billet is carried out by the wire electric discharge cutting method, and the surface precision of grade 4 or above is achieved. The surface roughness of the billet should be no less than R a = 1.25 to 2.5 μm. Clean the surface of the blank with acetone, place the blank on a clean stainless steel tray, preheat it at 80°C for 30 minutes, and then apply glass protective lubricant on the surface of the blank by dip coating, the coating should be uniform , The thickness of the coating is about 0.2mm. Afte...

Embodiment 2

[0017] Raw materials are prepared according to the atomic percentage of 50% titanium, 30% palladium, and 20% nickel, and are melted under vacuum conditions to make titanium-nickel-palladium alloy ingots. The titanium-nickel-palladium alloy block material is wire-cut into a billet with a cross-section of 9.3×9.3mm and a length of 87mm. The surface treatment of the billet is carried out by the wire electric discharge cutting method, and the surface accuracy of the billet is above grade 4. The surface roughness of the billet is not high. lower than R a = 1.25 to 2.5 μm. Clean the surface of the blank with acetone, place the blank on a stainless steel tray, preheat it at a temperature of 65°C for 50 minutes, and then apply a glass protective lubricant on the surface of the blank by dip coating. The thickness of the layer is about 0.3mm. After coating, the blank is dried at a temperature of 90°C for 20 minutes. If there are defects such as falling coating, scratches, and peeling, ...

Embodiment 3

[0020] Raw materials are prepared according to the atomic percentage of 50% titanium and 50% nickel, and are smelted under vacuum conditions to make titanium-nickel alloy ingots. Wire-cut the titanium-nickel alloy block material into a blank with a cross-section of 9.3×9.3mm and a length of 87mm. The surface treatment of the blank is carried out by the wire electric discharge method to achieve a surface precision of 4 or above. The surface roughness of the blank should not exceed lower than R a = 1.25 to 2.5 μm. Clean the surface of the blank with acetone, place the blank on a clean stainless steel tray, preheat it at 100°C for 20 minutes, and then apply glass protective lubricant on the surface of the blank by dip coating, the coating should be uniform , The thickness of the coating is about 0.4mm. After coating, the blank is dried at 90°C for 30 minutes. If there are defects such as falling coating, scratches, and peeling, it should be recoated or washed off and recoated. ...

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Abstract

The invention is a manufacturing method for a kind of micron tiny crystal titanium nickel-palladium high temperature shape memorizing alloy block materials, 48%-52% titanium, 0%-42% palladium, 10%-50% nickel, are melted and produced into titanium nickel-palladium alloy cast ingot, and cuts the titanium nickel-palladium alloy block material into blank, and carries on surface finish process, and paints with glass lubricate, uses isometric curved squeezing mould with 90-120 degrees channel angle, the mould cavity surface is painted with black lead lubricate, the blank and mould are heated and carries on temperature reservation, and takes them out to be squeezed at the same time, finally gets the product. The invention solves the problem that the bad plastic property of titanium nickel-palladium shape memorizing alloy in room temperature, enhances the alloy mechanical performance, and lowers the cost.

Description

Technical field: [0001] The invention relates to a method for preparing a microcrystalline titanium-nickel-palladium (TiPd-Ni)-based high-temperature shape-memory alloy, which uses an equal-diameter angle extrusion method to prepare titanium-nickel for improving the low-temperature plasticity, strength and high-temperature shape-memory performance of a high-temperature shape-memory alloy Palladium alloy block material, and then improve the practical engineering application value of the shape memory alloy in the fields of aerospace, medical and health, and civil industry. The invention belongs to the technical field of metal materials and metallurgy. Background technique: [0002] Since shape memory alloys came out in the 1970s, their shape memory effect and superelasticity have attracted extensive attention from the material community. It has been widely used in aerospace, biomedicine, civil industry and other fields, and has a broader application prospect. At present, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
Inventor 程先华谢超英李振华向国权
Owner SHANGHAI JIAO TONG UNIV
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