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TiNi alloy-based composite material with near-zero thermal expansion characteristic and preparation method thereof

A near-zero expansion and composite material technology, which is applied in the field of preparation of new materials, can solve the problems of low strength of memory alloy and high density of dense titanium-nickel shape memory alloy, etc., and achieve good comprehensive mechanical properties, stable strength and superelasticity, The effect of low density

Inactive Publication Date: 2012-07-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the shortcomings of porous titanium-nickel shape memory alloys with low strength and high density of dense titanium-nickel shape memory alloys, the invention provides a composite light-weight, high-strength, and nearly zero-expansion titanium-nickel alloy-based composite material and a preparation method thereof for the design and fabrication of dimensionally stable precision structures and devices

Method used

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  • TiNi alloy-based composite material with near-zero thermal expansion characteristic and preparation method thereof
  • TiNi alloy-based composite material with near-zero thermal expansion characteristic and preparation method thereof
  • TiNi alloy-based composite material with near-zero thermal expansion characteristic and preparation method thereof

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Embodiment 1

[0044] Pure Ti powder (average particle size is 50 μm) and pure Ni powder (average particle size is 50 μm), according to the Ti, Ni atomic ratio 56.2:43.8 ingredients mixed thoroughly for 24 hours to obtain the raw material powder A. Add 5wt.% urea (with a particle size of 600-900 μm) to powder A and mix thoroughly for 8 hours to make powder B. The powder B was pressed into a cylindrical green body with a diameter of 16 mm and a height of 26 mm at room temperature with a cold pressing pressure of 200 MPa. Put the billet into a tube-type sintering furnace, raise the temperature to 200°C under the protection of argon with a purity higher than 99.99%, and hold it for 40 minutes to remove the pore-forming agent, then raise the temperature to 680°C at a rate of 15°C / min, and hold it for 15 minutes. Minutes to activate the Ti and Ni atoms in the green body, then raise the temperature to 800°C at a rate of 6°C / min, keep it for 15 minutes, and finally raise the temperature to 1000°C a...

Embodiment 2

[0052] Pure Ti powder (average particle size is 50 μm) and pure Ni powder (average particle size is 50 μm), according to the Ti, Ni atomic ratio 55.8:44.2 ingredients mixed thoroughly for 24 hours to obtain raw material powder C. Add 10wt.% urea (with a particle size of 600-900 μm) to powder C and mix thoroughly for 8 hours to make powder D. The powder D was pressed into a cylindrical green body with a diameter of 16 mm and a height of 26 mm at room temperature with a cold pressing pressure of 100 MPa. Put the billet into a tube-type sintering furnace, raise the temperature to 200°C under the protection of argon with a purity higher than 99.99%, and hold it for 40 minutes to remove the pore-forming agent, then raise the temperature to 680°C at a rate of 15°C / min, and hold it for 15 minutes. Minutes to activate the Ti and Ni atoms in the green body, then raise the temperature to 800°C at a rate of 6°C / min, keep it for 15 minutes, and finally raise the temperature to 1000°C at a...

Embodiment 3

[0056] Raw material powder E was obtained by mixing pure Ti powder (average particle size 50 μm) and pure Ni powder (average particle size 50 μm) according to Ti:Ni atomic ratio 57.1:42.9 for 24 hours. Add 8wt.% urea (particle size: 300-450 μm) to powder E, and mix thoroughly for 8 hours to make powder F. The powder F was pressed into a cylindrical green body with a diameter of 16 mm and a height of 26 mm at room temperature with a cold pressing pressure of 200 MPa. Put the billet into a tube-type sintering furnace, raise the temperature to 200°C under the protection of argon with a purity higher than 99.99%, and hold it for 40 minutes to remove the pore-forming agent, then raise the temperature to 680°C at a rate of 15°C / min, and hold it for 15 minutes. Minutes to activate the Ti and Ni atoms in the green body, then raise the temperature to 800°C at a rate of 6°C / min, keep it for 15 minutes, and finally raise the temperature to 1000°C at a rate of 5°C / min, keep it for 3 hours...

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Abstract

The invention discloses a TiNi alloy-based composite material with a near-zero thermal expansion characteristic and a preparation method thereof. The method comprises the following steps of: uniformly mixing pure Ti powder and pure Ni powder according to an atomic ratio of titanium and nickel of (54-58 percent):(42-46 percent), preparing a porous TiNi alloy with negative thermal expansion and uniformly distributed pores by combining a holing technology and a unit metal powder step sintering method, and introducing a magnesium alloy with conventional positive thermal expansion into the pores of the porous TiNi alloy by using a light metal pressureless infiltration method to obtain the TiNi alloy-based composite material with the near-zero thermal expansion characteristic. The TiNi alloy-based composite material prepared by the method still has a shape memory effect and a hyperelastic behavior, is lighter than a compact TiNi alloy, has higher strength than the common porous TiNi alloy, and has the near-zero thermal expansion characteristic under certain conditions. The invention is used for preparing near-zero thermal expansion materials and controlling the thermal expansivity of the materials.

Description

technical field [0001] The invention relates to the preparation technology of a novel material exhibiting near-zero expansion properties to temperature changes, in particular to a preparation method of a TiNi shape-memory alloy-based composite material with near-zero expansion properties. Background technique [0002] In the functional structures, components and facilities widely used in aerospace, mechanical engineering, precision instruments and other fields, the phenomenon of thermal expansion and contraction of various materials due to temperature changes greatly restricts the service performance and reliability of structures and components. sex. For example, aerospace structures and devices usually experience drastic changes in ambient temperature, so the difference in thermal expansion coefficient between different materials will cause a large internal stress inside the structure and devices, and lead to the original fit of holes, pins, keys and other structures. Chan...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C14/00B22F3/16B22F3/24
Inventor 张新平关锐峰马骁罗军平
Owner SOUTH CHINA UNIV OF TECH
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