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Preparation method for high-intensity nickel-based high-temperature self-lubricating composite material

A high-temperature self-lubricating and composite material technology is applied in the field of preparation of high-strength nickel-based high-temperature self-lubricating composite materials to achieve the effects of good heat resistance and high oxidation stability

Active Publication Date: 2014-01-29
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

The PM304 composite material prepared by pressureless sintering, paired with Inconel X-750 superalloy, has a friction coefficient of 0.32-0.40 from room temperature to 800 ° C, but the room temperature tensile strength is less than 50 MPa (Composites: Part A 38 (2007) 348–352 ;Wear)

Method used

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  • Preparation method for high-intensity nickel-based high-temperature self-lubricating composite material
  • Preparation method for high-intensity nickel-based high-temperature self-lubricating composite material
  • Preparation method for high-intensity nickel-based high-temperature self-lubricating composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the mass percentage: Ag10%, BaF 2 with CaF 2 Eutectic 10%, Cr 2 o 3 10%, nickel-based alloy 70%, each powder material was weighed separately, wherein the nickel-based alloy composition is: 70Ni-15Cr-8Mo-5W-2Ti. Mix in a high-energy ball mill at a speed of 200 rpm for 6 hours to obtain a composite powder, put the composite powder into a graphite mold, and then place it in a vacuum hot-press sintering furnace for hot-press sintering. The sintering parameters are: vacuum 0.8×10 -1 Pa, heating rate 20°C / min, sintering temperature 1100°C, applied pressure 20MPa, holding time 30min. After sintering, the material is cooled to room temperature with the furnace and taken out.

[0021] The room temperature compressive strength of the material is 1515MPa, the bending strength is 1128MPa, and the hardness is 3.48GPa. The average friction coefficient and wear rate from room temperature to 900°C are shown in Table 1 below.

[0022] Table 1: Material friction coeffic...

Embodiment 2

[0025] According to the mass percentage: Ag12%, BaF 2 with CaF 2 Eutectic 10%, Cr 2 o 3 5%, nickel-based alloy 73%, each powder material was weighed separately, wherein the nickel-based alloy composition is: 70Ni-15Cr-8Mo-5W-2Ti. Mix in a high-energy ball mill at a speed of 300 rpm for 6 hours to obtain a composite powder, put the composite powder into a graphite mold, and then place it in a vacuum hot-press sintering furnace for hot-press sintering. The sintering parameters are: vacuum 0.6×10 -1 Pa, heating rate 20°C / min, sintering temperature 1100°C, applied pressure 15MPa, holding time 30min. After sintering, the material is cooled to room temperature with the furnace and taken out.

[0026] The room temperature compressive strength of the material is 1483MPa, the bending strength is 1140MPa, and the hardness is 3.36GPa. The average friction coefficient and wear rate from room temperature to 900°C are shown in Table 2 below.

[0027] Table 2: Material friction coeffici...

Embodiment 3

[0030] According to the mass percentage: Ag12%, BaF 2 with CaF 2 Eutectic 8%, Cr 2 o 3 20%, nickel-based alloy 60%, each powder material was weighed separately, wherein the nickel-based alloy composition is: 71Ni-12Cr-10Mo-4W-3Ti. Mix in a high-energy ball mill at a speed of 300 rpm for 6 hours to obtain a composite powder, put the composite powder into a graphite mold, and then place it in a vacuum hot-press sintering furnace for hot-press sintering. The sintering parameters are: vacuum 0.6×10 -1 Pa, heating rate 20°C / min, sintering temperature 1200°C, applied pressure 15MPa, holding time 30min. After sintering, the material is cooled to room temperature with the furnace and taken out.

[0031]The room temperature compressive strength of the material is 1380MPa, the bending strength is 1062MPa, and the hardness is 3.75GPa. The average friction coefficient and wear rate from room temperature to 900°C are shown in Table 3 below.

[0032] Table 3: Material friction coeffici...

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Abstract

The invention discloses a preparation method for a high-intensity nickel-based high-temperature self-lubricating composite material. The composite material is prepared by a hot-press sintering technology. The composite material has the characteristics of low friction abrasion and high intensity under low temperature of 900 DEG C. The material is suitable for manufacturing high-temperature mechanism lubricating components, such as a high-temperature bearing, a bushing, a sliding block and a sealing piece, which can be used at the low temperature of 900 DEG C and has a wide application prospect in the fields of aviation, metallurgy, machinery and the like.

Description

technical field [0001] The invention relates to a preparation method of a high-strength nickel-based high-temperature self-lubricating composite material. The material is characterized by high strength and excellent lubricity at the same time, and can be used at a low temperature to 900°C. Background technique [0002] Modern industries such as aerospace, metallurgy, machinery, automobiles and nuclear power have huge demands for materials and technologies with continuous lubrication in a wide temperature range from room temperature to high temperature. There are more and more lubrication problems involving high-temperature moving parts at temperatures of 700°C or higher. When the mechanical moving parts are at a temperature higher than 400°C, their lubrication and wear resistance issues become the key to the safe, reliable and stable operation of the entire system. At present, there are two methods to solve the problem of high temperature lubrication mainly through self-lub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C19/03
Inventor 杨军刘维民马吉强毕秦岭李斐符立才朱圣宇
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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