Unlock instant, AI-driven research and patent intelligence for your innovation.

Application of NiAl-2.5Ta-7.5Cr-1B alloy as high-temperature self-lubricating material

A high-temperature self-lubricating and composite material technology, which is applied in the field of high-temperature self-lubricating applications, can solve the problems of poor room temperature tensile plasticity, low room temperature fracture resistance, and low high temperature creep resistance, etc., and achieves wide application range, excellent self-lubricating performance, Excellent plasticity and hardness

Active Publication Date: 2015-04-01
嘉兴博朗金属科技有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, NiAl has not been widely put into practical use due to problems such as poor room temperature tensile plasticity, low room temperature fracture resistance, insufficient high temperature strength, and low high temperature creep resistance.
This is because people only use methods such as solid solution strengthening, second phase strengthening, and oxide dispersion strengthening (ODS) from the perspective of preparing endogenous and exogenous composite materials to improve the high temperature creep resistance and room temperature of NiAl alloys. Fracture toughness, but it is still difficult to meet the requirements of NiAl-based alloys with sufficient room temperature fracture toughness, creep strength comparable to superalloys, and 2% room temperature tensile plasticity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Application of NiAl-2.5Ta-7.5Cr-1B alloy as high-temperature self-lubricating material
  • Application of NiAl-2.5Ta-7.5Cr-1B alloy as high-temperature self-lubricating material
  • Application of NiAl-2.5Ta-7.5Cr-1B alloy as high-temperature self-lubricating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this embodiment, the wear temperature is room temperature, the abrasive part is SiC ceramics, the load is 45N, the sliding speed is 0.3m / s, the wear time is 10min, and the sliding distance is 180m. The NiAl-2.5Ta-7.5Cr-1B alloy block sample is fixed on the lower sample fixture, and the SiC ceramic material is fixed on the upper sample fixture. After loading, the upper sample shaft drives the SiC ball sample to reciprocate at high speed to start friction and wear.

[0038] like figure 2 As shown, the friction coefficient of the NiAl-2.5Ta-7.5Cr-1B alloy in Example 1 progresses with the wear test. After 5 seconds of wear, the friction coefficient basically reaches a stable state, and the measured average friction coefficient is 0.25.

[0039] like image 3 As shown, the friction surface morphology of NiAl-2.5Ta-7.5Cr-1B alloy in Example 1 can be seen that a smoother, smoother and complete lubricating film is formed on the friction surface, and the lubricating film ha...

Embodiment 2

[0041] The wear temperature of this embodiment is 100°C, and the abrasive part is Si 3 N 4 For ceramics, the load is 80N, the sliding speed is 0.2m / s, the wear time is 10min, and the sliding distance is 120m. Fix the NiAl-2.5Ta-7.5Cr-1B alloy bulk sample on the lower sample holder, Si3 N 4 The ceramic material is fixed on the upper sample fixture, placed in a heating electric furnace, the heating temperature is 100°C, and the heating rate is 20°C / min. After the temperature rises to 100°C, it is kept for 2 minutes, loaded, and the upper sample shaft drives Si 3 N 4 The ball sample reciprocates at high speed to start friction and wear, and is cooled to room temperature in the air after shutdown.

[0042] like Figure 4 As shown, the friction coefficient of the NiAl-2.5Ta-7.5Cr-1B alloy in Example 2 is carried out with the wear test. After wearing for 5s, the friction coefficient drops to around 0.25 and remains stable. The measured average friction coefficient is 0.25.

[...

Embodiment 3

[0045] The wear temperature of this embodiment is 200°C, and the pair of abrasive parts is Si 3 N 4 For ceramics, the load is 115N, the sliding speed is 0.45m / s, the wear time is 10min, and the sliding distance is 270m. Fix the NiAl-2.5Ta-7.5Cr-4B alloy bulk sample on the lower sample holder, Si 3 N 4 The ceramic ball is fixed on the upper sample fixture and placed in a heating electric furnace. The heating temperature is 200°C and the heating rate is 20°C / min. Si 3 N 4 Ceramic balls reciprocate at high speed to start friction and wear, and cool down to room temperature in the air after shutdown.

[0046] like Figure 6 As can be seen, the friction coefficient of NiAl-2.5Ta-7.5Cr-4B alloy in Example 3 is carried out with the wear test. After wearing for 5s, the friction coefficient drops to around 0.24 and remains basically stable. The measured average friction coefficient is 0.24.

[0047] like Figure 7 As shown, the friction surface morphology of NiAl-2.5Ta-7.5Cr-1B...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
friction coefficientaaaaaaaaaa
dispersion coefficientaaaaaaaaaa
friction coefficientaaaaaaaaaa
Login to View More

Abstract

The invention discloses application of an NiAl-2.5Ta-7.5Cr-1B alloy as a high-temperature self-lubricating material. Electrolytic Ni and metals Al, Cr, Ta and Ni-B used as raw materials are smelted in a vacuum arc furnace and cast according to the proportion of NiAl-2.5Ta-7.5Cr-1B. When the alloy is used as a self-lubricating material for a mechanism slide component applicable to room temperature to 600 DEG C, the wearing part material is an SiC, Si3N4 or Al2O3 ceramic material, the load is 20-115N, the slide speed is 0.2-0.45 m / s, and the sliding friction mode is pin-disk rotational slide or reciprocating slide. Under such working conditions, the NiAl-2.5Ta-7.5Cr-1B alloy has excellent enduring self-lubricating property. The invention solves the problem of self-lubricating property of the NiAl-base alloy at normal temperature to 200 DEG C and at 500 DEG C to 600 DEG C.

Description

technical field [0001] The invention relates to high-temperature self-lubricating application technology of nickel-aluminum-based composite materials, in particular to the application of a NiAl-2.5Ta-7.5Cr-1B alloy as a high-temperature self-lubricating material. Background technique [0002] The intermetallic compound NiAl is an ideal high-temperature structural material, with a high melting point (1640°C), high thermal conductivity (70-80W / m K), low density (5.86g / cm 3 ) and excellent antioxidant properties. However, NiAl has not been widely put into practical use due to problems such as poor room temperature tensile plasticity, low room temperature fracture resistance, insufficient high temperature strength, and low high temperature creep resistance. At present, NiAl has not been widely used as a high-temperature structural material and functional material, except that it is widely used as a coating material for Ni-based and Co-based superalloys. This is because people ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05
Inventor 王振生张孟恩杨双双郭建亭周兰章郭源君宋力赵威为
Owner 嘉兴博朗金属科技有限公司