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A kind of nickel-silicon-based self-lubricating alloy in seawater environment and preparation method thereof

An environment, nickel-silicon technology, applied in the field of preparation of solid self-lubricating materials, can solve the problems of low strength and limited use, and achieve the effects of excellent lubrication performance, good wear resistance and high hardness

Active Publication Date: 2021-03-26
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Babbitt alloy (TribolInt. 2011;44:1161-7), copper alloy (Tribol Int. 2012;55:126-34), polytetrafluoroethylene (TribolLett. 2011;42:17-25), graphite, etc. The strength of solid lubricating materials is not high, which limits the use under high load and high speed conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] According to 10 wt.% Ag powder, 8 wt.% Ti powder, 82 wt.% Ni 3 Si powder was weighed as a powder material and placed in a planetary ball mill for dry mixing: the ball-to-material ratio was 2:1, the grinding ball was tungsten carbide ball, the rotation speed was 300 r / min, and the ball milling mixing time was 8 h to obtain the mixed powder. Put the mixed powder into a graphite mold, and then heat it in a spark plasma sintering furnace with a load of 40 MPa. The heating rate is 100°C / min when the temperature is lower than 800°C, and 50°C / min when the temperature is higher than 800°C. When the temperature reaches 840°C, keep it warm for 10 minutes. Then turn off the power and cool down with the furnace to obtain the solid lubricant Ni 3 Si-Ti-Ag

[0016] to you 3 The Si-Ti-Ag self-lubricating material was tested, and its micro-Vickers hardness was 2.2GPa, and the friction coefficient and wear rate are shown in Table 1:

[0017] .

Embodiment 2

[0019] According to 15 wt.% Ag powder, 5 wt.% Ti powder and 80 wt.% Ni 3 Si powder was weighed as powder material, and placed in a planetary ball mill for dry mixing: the ball-to-material ratio was 2:1, the grinding ball was tungsten carbide ball, the speed was 250 r / min, and the mixing time was 7 h to obtain a mixed powder; then the mixed The powder is put into a graphite mold, placed in a spark plasma sintering furnace, loaded with 35 MPa, the heating rate is 100°C / min when the temperature is lower than 800°C, 50°C / min when the temperature is higher than 800°C, and when the temperature reaches 860°C ℃, keep warm for 20min. Turn off the power, cool down with the furnace, and get Ni 3 Si-Ti-Ag self-lubricating material.

[0020] to you 3 The Si-Ti-Ag self-lubricating material was tested, and its micro-Vickers hardness was 1.8GPa, and the friction coefficient and wear rate are shown in Table 2:

[0021] .

Embodiment 3

[0023] According to 5 wt.% Ag powder, 4 wt.% Ti powder and 91 wt.% Ni 3 Si powder was weighed as a powder material and placed in a planetary ball mill for dry mixing: the ball-to-material ratio was 1.5:1, the grinding ball was tungsten carbide ball, the rotation speed was 300 r / min, and the ball milling mixing time was 7 h to obtain the mixed powder. Put the mixed powder into a graphite mold, and then heat it in a spark plasma sintering furnace with a load of 30MPa. The heating rate is 100°C / min when the temperature is lower than 800°C, and 50°C / min when the temperature is higher than 800°C. When the temperature reaches 880°C, keep it warm for 15 minutes. Turn off the power, cool down with the furnace, and get Ni 3 Si-Ti-Ag self-lubricating material.

[0024] to you 3 Si-Ti-Ag self-lubricating alloy was tested, and its micro-Vickers hardness was 2.4GPa, and the friction coefficient and wear rate are shown in Table 3:

[0025] .

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Abstract

The invention discloses nisiloy-based self-lubricating alloy in the sea water environment and a preparation method thereof. 5-15 wt.% of Ag powder, 4-8 wt.% of Ti powder and 80-91 wt.% of Ni3Si powderare mixed, ball-milled, placed in a graphite mold and placed in a plasma sintering furnace for sintering, in the sintering process, the pressure is 20-40 MPa, the temperature is increased to 800-900DEG C, and the temperature and pressure are preserved for 5-10 min; after the furnace is cooled, the alloy is obtained. The self-lubricating alloy has high hardness, good wear resistance performance and excellent lubricating performance, in the sea water environment, the alloy and aluminum oxide ceramic are matched into a pair to show good lubricating performance and high wear resistance performance, and the alloy can be used for machining of a slide bearing and a movable sealing component which are used for operation in the marine environment.

Description

technical field [0001] The invention relates to the preparation of a solid self-lubricating material, in particular to a nickel-silicon-based self-lubricating alloy and its preparation, which can be used for the processing of sliding bearings, sealing parts and water-lubricating bearings in marine environments. Background technique [0002] Components serving in the ocean are often affected by the joint action of corrosion and friction, resulting in rapid instability and failure, which poses severe challenges to marine industrial equipment. When the friction parts are exposed to seawater, the incompatibility between the lubricating oil and seawater limits the direct use of the lubricating oil, and the viscosity of seawater at room temperature is much lower than that of mineral oil, so the parts are not completely damaged during the friction process. To achieve liquid lubrication, it is often in a mixed lubrication state. The use of solid lubricating materials with self-lubr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/18C22C1/05C22C1/10
CPCC22C1/051C22C29/005C22C29/18
Inventor 杨军朱圣宇程军刘维民乔竹辉于源谈辉
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI