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Titaniferous cuprum-nickel-stannum spinodal decomposition type anti-friction bearing alloy and preparation method thereof

A technology of amplitude modulation decomposition and wear-resistant bearings, which is used in bearing components, shafts and bearings, mechanical equipment, etc.

Inactive Publication Date: 2004-09-01
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above patents, Ti has not been seen so far in the ternary amplitude modulation decomposition type Cu-Ni-Sn alloy to refine the crystal grains and improve the tribological properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] An alloy with a proportion of 15% Ni, 8% Sn and 77% Cu (mass ratio) is melted in a vacuum induction furnace. After melting, it is fully degassed, and pure Sn and near-equivalent atoms are successively added from a hopper under an argon-filled atmosphere. than the NiTi alloy. After being stirred, it is poured into a flat billet.

[0018] The analytical composition (mass ratio) of alloy 1 is: Ni: 15.2%, Sn: 6.97%, Ti: 0.025%, and the remainder is Cu.

[0019] The analysis composition (mass ratio) of alloy 2 is: Ni: 15.2%, Sn: 7.23%, Ti: 0.30%, and the balance is Cu.

[0020] The billet is homogenized at 850°C for 40 hours and then furnace cooled, then heated to 850°C for 1 hour and then water cooled. Then aging at 400-450°C for 1 hour. The billets after heat treatment were processed into samples, and the mechanical properties tested are shown in Table 1. The mechanical properties of the control example ternary Cu-15Ni-8Sn as-cast alloy (alloy 3) after heat treatment ar...

Embodiment 2

[0024] The alloy whose proportioning composition is Cu-15Ni-8Sn (mass%) is smelted in a vacuum induction furnace, and a NiTi master alloy (alloy number T1) is added along with the furnace, and the addition amount is 0.1% of the total amount. After melting, it is fully degassed and cast into a tube blank of φ60×φ43.5×273 under an argon atmosphere. The analyzed components are Ni: 14.78%, Sn: 8.39%, Ti: 0.065%, and the remainder is Cu. The tube blank is homogenized at 850°C for 15 hours and then furnace cooled, then heated to 850°C for 1 hour and then water cooled. Then aging at 430-450°C for 2.5 hours. The measured hardness is HRc32-36. The tube blank is processed into a finished shaft sleeve of φ54.21±0.015×φ50.24±0.015×19.0, and the high-speed sliding bearing simulation test is carried out on the MMZ-180 bearing testing machine, and compared with the ternary Cu-Ni-Sn.

Embodiment 3

[0026] The alloy whose proportioning composition is Cu-15Ni-8Sn (mass%) is smelted in a vacuum induction furnace. After melting, it is fully degassed, and 0.1% of the total amount of the alloy is added from the hopper under an argon atmosphere. NiTi master alloy (the alloy number is T2 ), fully stirred and poured into a tube blank of φ60×φ43.5×273. The analyzed components are Ni: 14.84%, Sn: 7.88%, Ti: 0.10%, and the balance is Cu. After the same heat treatment as in Example 2, the hardness is 35-39. After being processed into a shaft sleeve, the same high-speed sliding bearing simulation test is carried out.

[0027] The results of the high-speed sliding bearing simulation test carried out by the above examples 2 and 3 show that the Cu-15Ni-8Sn alloy with Ti added at a high speed of 375rpm has a maximum bite load of 75-128kN, which is 36-110% higher than that of the ternary alloy . The wear life is 80-100 hours, which is 40-66% higher than that of ternary alloys.

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Abstract

A titanium containing Cu-Ni-Sn spinodal decomposition type anti-friction bearing alloy and method for making same, wherein the right amount of the fourth quadruple Ti into ternary Cu-Ni-Sn alloy by using copper peptide intermediate alloy mode, and vacuum induction electric furnace smelting or nonvacuum smelting casting are utilized for machining element through homogenization, quench and agehardening under casting state. The invention realizes high alloy strength, high expandability and high-wearing feature, thus can be applied to slide shaft sleeve of rock bit, or situations needing abrasion resistance for bearing high speed and heavy-duty bearing.

Description

Technical field: [0001] The invention relates to a titanium-containing copper-nickel-tin amplitude-modulated decomposition type wear-resistant bearing alloy and a preparation method thereof. The prepared new alloy is applied to sliding bushings of rock drilling bits, or other bearings that withstand high speed and heavy loads, etc. In the case of anti-wear properties, it belongs to the technical field of new materials. Background technique: [0002] Cu-15Ni-8Sn alloy is a typical spinodal strengthened alloy. Quenching after solid solution treatment in the high temperature zone, the alloy is α single phase, and then aged in the medium temperature zone, and decomposed into α and γ two-phase structure through Spinodal. Compared with the usual nucleation and long-scale aging strengthening, it is characterized by the same structure of the two phases, but different chemical compositions (the α region is poor in tin, and the γ region is rich in tin), and the two phases are coheren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/06
CPCF16C33/121
Inventor 江伯鸿张少宗毛红兵
Owner SHANGHAI JIAO TONG UNIV
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