Ni-ti porous material miniature parts and its sintering method

A technology of porous materials and micro parts, which is applied in the field of rapid sintering to prepare porous material parts, can solve the problems of low product qualification rate, low product purity and high molding temperature, and achieve the effect of simplifying the process flow, uniform pores and excellent performance

Active Publication Date: 2016-03-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the current problems and deficiencies in the preparation of micro-parts made of Ni-Ti porous materials, such as complex procedures, long preparation cycle, high molding temperature, low product qualification rate, raw material dependence on additives, resulting in low product purity and certain pollution to the environment etc.; and there is no research on porous materials in micro-forming theory, the technical problem solved by the present invention is to provide a method for rapidly preparing porous Ni-Ti porous material micro-parts by multi-physical field activation sintering micro-forming technology, the method's greatest advantage short preparation time

Method used

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  • Ni-ti porous material miniature parts and its sintering method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Weigh the Ni and Ti powders shown in the above table according to the prefabrication process parameters, put them into the mold and fix them with chucks. Under the condition of vacuum ≤ 0.01Pa and a pressure of 50MPa on both ends at the same time, at a speed of 10℃ / s Raise the temperature to 200°C, keep it warm for 30s, then raise the temperature to 800°C at a rate of 50°C / s, and sinter 3 times in the range of 800°C-400°C; the powder is formed in the mold and sintered, and finally the power is turned off and air-cooled to take out the parts That's it.

Embodiment 2

[0040] Weigh the Ni and Ti powders shown in the above table according to the prefabrication process parameters, put them into the mold and fix them with chucks. Under the condition of vacuum ≤ 0.01Pa and a pressure of 150MPa on both ends at the same time, at a speed of 20℃ / s Raise the temperature to 300°C, hold it for 120s, then raise the temperature to 1200°C at a speed of 100°C / s, and sinter 15 times in the range of 1200°C-800°C; the powder is formed in the mold and sintered, and finally the power is turned off and air-cooled to take out the part That's it.

Embodiment 3

[0042] Weigh the Ni and Ti powders shown in the above table according to the prefabrication process parameters, put them into the mold and fix them with chucks. Under the condition of vacuum ≤ 0.01Pa and a pressure of 150MPa on both ends at the same time, at a speed of 20℃ / s Raise the temperature to 200°C, keep it warm for 60s, then raise the temperature to 1000°C at a rate of 50°C / s, and sinter 5 times in the range of 1000°C-600°C; the powder is formed in the mold and sintered, and finally the power is turned off and air-cooled to take out the parts That's it.

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Abstract

The invention discloses a Ni-Ti porous material mini-sized part sintered in an activated mode and prepared on the basis of a multi-physics field and a sintering method thereof. According to the method, metallic nickel Ni powder and metallic titanium Ti powder are weighed, fixed and filled into a die; then the die filled with Ni-Ti mixed powder is energized with alternating currents for quick heating under the conditions that the vacuum degree is smaller than or equal to 0.01Pa and the two ends of the die are applied with action force of 50-150MPa, wherein the electric field constant temperature sintering method or the electric heating fluctuation sintering method can be used as the heating technology. After the mixed powder form a shape in the die, the part can be taken out after power off and air cooling. According to the Ni-Ti porous material mini-sized part and the sintering method thereof, technology processes are simplified, the forming process is easy to control, the sintering process is free of pollution, sintering time is shortened, sintering temperature is reduced, and production quality is improved.

Description

technical field [0001] The invention relates to a Ni-Ti porous material micro-part prepared based on multi-physics field activation sintering and a sintering method thereof, and belongs to the technical field of rapid sintering preparation of porous material parts. Background technique [0002] Due to its excellent biocompatibility, unique shape memory properties, superelasticity and corrosion resistance, Ni-Ti porous material micro parts have attracted much attention in the field of biomedicine in recent years. Studies have shown that porous structures can promote bone tissue regeneration, nutrient exchange, and drug delivery in organisms. At the same time, through the control of pore-related parameters, the porous shape memory alloy can better adapt to the surrounding bone environment by adjusting the hardness and strength when used as an implant material. It is expected to be applied to hard tissue replacement materials and surgical implant materials. A large number of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/14
Inventor 杨屹杨刚周宇尹德强
Owner SICHUAN UNIV
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