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Powder metallurgy preparation method of nickel-titanium alloy gear

A nickel-titanium alloy and powder metallurgy technology, applied in the field of gears, can solve the problems of complex phase composition, difficult processing, poor wear resistance, etc., and achieve the effect of reducing processing difficulty, complete and stable structure, and preventing local cracking

Active Publication Date: 2022-06-24
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional nickel-titanium alloy (the mass content of nickel is 54.5% to 57%, recorded as 55NiTi) has high plasticity and is easy to process and shape, but its hardness does not exceed HRC40 and its wear resistance is poor.
For nickel-rich nickel-titanium alloys (the mass content of nickel is 59% to 61%, denoted as 60NiTi), the hardness after heat treatment can reach up to HRC62, and it has good wear resistance and can withstand severe impact loads; but the phase composition is complex, Intrinsically brittle and difficult to process

Method used

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  • Powder metallurgy preparation method of nickel-titanium alloy gear

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment includes the following steps:

[0027] Step 1. Cold-press the 55NiTi alloy powder into a round cake-shaped blank, then place the 60NiTi alloy powder evenly on the outer ring of the round cake-shaped blank and perform cold pressing again to obtain a 55NiTi alloy layer on the inner ring and a 60NiTi alloy layer on the outer ring. pressed blanks, such as figure 1 The mass content of nickel in the 55NiTi alloy powder is 56.01%, the mass content of C is 0.03%, the mass content of N is 0.005%, and the mass content of O is 0.055%; the mass content of nickel in the 60NiTi alloy powder is 59.76% %, the mass content of C is 0.01%, the mass content of N is 0.003%, and the mass content of O is 0.045%; the thickness of the outer ring 60NiTi alloy layer in the pressed blank is 10mm;

[0028] Step 2, place the pressed blank obtained in step 1 in a vacuum sintering furnace, and vacuumize to 10 -3 After Pa, turn off the vacuum and fill in the dried argon gas, and then ...

Embodiment 2

[0034] This embodiment includes the following steps:

[0035] Step 1: Cold-press the 55NiTi alloy powder into a round cake-shaped blank, then place the 60NiTi alloy powder evenly on the outer ring of the round cake-shaped blank and perform cold pressing again to obtain a 55NiTi alloy layer on the inner ring and a 60NiTi alloy layer on the outer ring. pressed blanks such as figure 1 The mass content of nickel in the 55NiTi alloy powder is 54.50%, the mass content of C is 0.02%, the mass content of N is 0.005%, and the mass content of O is 0.053%; the mass content of nickel in the 60NiTi alloy powder is 59.00%, the mass content of C is 0.015%, the mass content of N is 0.007%, and the mass content of O is 0.051%; the thickness of the outer ring 60NiTi alloy layer in the pressed blank is 9mm;

[0036] Step 2, place the pressed blank obtained in step 1 in a vacuum sintering furnace, and vacuumize to 10 -3 After Pa, turn off the vacuum and fill in the dried argon gas, and evacuate...

Embodiment 3

[0042] This embodiment includes the following steps:

[0043] Step 1: Cold-press the 55NiTi alloy powder into a round cake-shaped blank, then place the 60NiTi alloy powder evenly on the outer ring of the round cake-shaped blank and perform cold pressing again to obtain a 55NiTi alloy layer on the inner ring and a 60NiTi alloy layer on the outer ring. pressed blanks such as figure 1 The mass content of nickel in the 55NiTi alloy powder is 57.00%, the mass content of C is 0.01%, the mass content of N is 0.004%, and the mass content of O is 0.048%; the mass content of nickel in the 60NiTi alloy powder is 61.00% %, the mass content of C is 0.01%, the mass content of N is 0.008%, and the mass content of O is 0.046%; the thickness of the outer ring 60NiTi alloy layer in the pressed blank is 9.5mm;

[0044] Step 2, place the pressed blank obtained in step 1 in a vacuum sintering furnace, and vacuumize to 10 -3 After Pa, turn off the vacuum and fill in the dried argon gas, and evacu...

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Abstract

The invention discloses a powder metallurgy preparation method of a nickel-titanium alloy gear, which comprises the following steps: 1, carrying out cold pressing on 55NiTi alloy powder to form a cake-shaped blank, uniformly placing 60NiTi alloy powder on the outer ring of the cake-shaped blank, and carrying out cold pressing to obtain a pressed blank; 2, sintering at high temperature to obtain a nickel-titanium alloy sintered blank; thirdly, after the sheath is sealed, hot isostatic pressing treatment is conducted to obtain a gear blank; 4, performing high-frequency local induction heating on gear teeth in the gear blank, and then performing water-cooling hardening to obtain a hardened gear; and fifthly, the nickel-titanium alloy gear is obtained through machining. The nickel content of the nickel-titanium alloy powder at different parts of the gear is adjusted, the double-performance nickel-titanium alloy gear with the gear teeth made of the high-hardness 60NiTi alloy and the interior made of the high-plasticity 55NiTi alloy is prepared, and the nickel-titanium alloy gear is light in weight, resistant to corrosion and abrasion, free of magnetism, capable of bearing severe impact loads and suitable for the fields of aerospace, marine ships, petrochemical engineering and the like.

Description

technical field [0001] The invention belongs to the technical field of gears, and in particular relates to a powder metallurgy preparation method of nickel-titanium alloy gears. Background technique [0002] Gears are the basic components commonly used in machinery, but traditional alloy steel gears can no longer meet the needs of some special occasions. For example, when a special gas with strong corrosiveness is transmitted in a project, the 40Cr alloy steel gear used produces ferromagnetic powder due to corrosion and friction, which causes friction between the inner magnetic rotor and the spacer, which accelerates the heating rate of the magnetic drive and greatly reduces the the service life of the magnetic actuator. Therefore, in order to adapt to the above working conditions, it is necessary to develop a new type of gear with comprehensive properties such as light weight, high strength, corrosion resistance and wear resistance, electrical conductivity and non-magnetic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F3/10B22F3/15B22F5/08C22C19/03
CPCB22F5/08C22C19/03B22F3/02B22F3/1007B22F3/15Y02P10/25
Inventor 杨海瑛李磊洪权陈军郭荻子赵圣泽赵亮
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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