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Preparation method of in-situ growth solid lubricant reinforced nickel-based high-temperature lubricating composite material

A solid lubricant, in-situ growth technology, used in the field of high-temperature lubricating composite materials to achieve the effects of improving wettability, dense tissue structure, and uniform tissue

Active Publication Date: 2020-05-19
咸阳瞪羚谷新材料科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an in-situ growth solid lubricant reinforced nickel-based high-temperature lubricating composite material preparation method for the above-mentioned deficiencies in the prior art, using Bi 2 o 3 and TiO 2 In situ reaction during sintering to generate Bi 4 Ti 3 o 12 High temperature lubricant, realize the high temperature lubricating performance of the composite material, at the same time, it can effectively improve the problem of poor wettability between the metal oxide and the matrix, and improve the strength of the composite material

Method used

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  • Preparation method of in-situ growth solid lubricant reinforced nickel-based high-temperature lubricating composite material
  • Preparation method of in-situ growth solid lubricant reinforced nickel-based high-temperature lubricating composite material
  • Preparation method of in-situ growth solid lubricant reinforced nickel-based high-temperature lubricating composite material

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preparation example Construction

[0028] The invention discloses a method for preparing a nickel-based high-temperature lubricating composite material enhanced by an in-situ growth solid lubricant. A uniformly mixed nanostructure mixed powder is prepared by high-energy ball milling, and a nanostructure composite material with uniform phase distribution is successfully prepared. Bi 2 o 3 with TiO 2 In situ reaction to generate Bi during high temperature sintering 4 Ti 3 o 12The high-temperature solid lubricant realizes the high-temperature lubrication performance of the composite material. At the same time, it effectively improves the problem of poor wettability between the metal oxide and the NiCr matrix, and significantly improves the microhardness and compressive strength of the composite material. At the same time, it realizes The high-strength and high-temperature lubricating properties of composite materials are guaranteed. Specific steps are as follows:

[0029] S1. Mixed powder ratio and ball milli...

Embodiment 1

[0039] The method of high-energy ball milling is used to prepare uniformly mixed nanostructure mixed powder. In terms of mass percentage, 60% of NiCr, 15% of Mo, 25% of Bi 2 o 3 / TiO 2 Put the powder into a zirconia ball mill tank for high-energy ball milling, control the mass ratio of balls to 5:1, rotate at 200r / min, mill for 10 hours, dry at 80°C for 1 hour, and mix well Nanostructured mixed powder with a particle size of 15nm, and then the mixed powder was loaded into a graphite grinding tool.

[0040] Before powder loading, a layer of graphite paper is laid on the wall of the graphite grinding tool to prevent the powder from sticking to the graphite grinding tool during the sintering process. The homogeneously mixed nanostructured mixed powder has the effect of fine grain strengthening, which can effectively improve the strength of the composite material. Bi added in the composite 2 o 3 / TiO 2 On the one hand, bimetallic oxides can effectively improve the strength ...

Embodiment 2

[0044] The method of high-energy ball milling is used to prepare uniformly mixed nanostructure mixed powder. In terms of mass percentage, 70% of NiCr, 10% of Mo, 20% of Bi 2 o 3 / TiO 2 Put the powder into a zirconia ball mill tank for high-energy ball milling, control the mass ratio of balls to 10:1, rotate at 250r / min, mill for 15 hours, dry at 90°C for 1.5 hours, and prepare the mixed Uniform nanostructure mixed powder with a particle size of 30nm, and then the mixed powder is loaded into a graphite grinding tool.

[0045] Before powder loading, a layer of graphite paper is laid on the wall of the graphite grinding tool to prevent the powder from sticking to the graphite grinding tool during the sintering process. The homogeneously mixed nanostructured mixed powder has the effect of fine grain strengthening, which can effectively improve the strength of the composite material. Bi added in the composite 2 o 3 / TiO 2 On the one hand, bimetallic oxides can effectively im...

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Abstract

The invention discloses a preparation method of an in-situ-grown solid lubricant reinforced nickel-based high-temperature lubricating composite material. The preparation method comprises the followingsteps that NiCr, Mo and Bi2O3 / TiO2 are mixed, ethanol is added into the mixture to carry out ball milling treatment, and then powder screening and drying are carried out; the dried mixed powder is put into a graphite die to carry out cold press molding treatment; and finally vacuum hot-pressing sintering is carried out to prepare a nano-structure NiCr-Mo-Bi2O3 / TiO2 composite material, wherein themicrohardness of the nano-structure NiCr-Mo-Bi2O3 / TiO2 composite material is 480-510 HV, and the compressive strength is 1300-1500 MPa. According to the high-temperature lubricating composite material prepared by the method, the wettability between metal oxide and an NiCr matrix is effectively improved, and the bonding strength between the metal oxide and the matrix is improved; the Mo has a solid solution strengthening effect, so that the strength of the composite material can be further improved; the added Bi2O3 and TiO2 can react in a high-temperature sintering process to generate a Bi4Ti3O12 high-temperature solid lubricant, so that the high-temperature lubricating property of the composite material is realized; and fine nano-particles in the composite material have a fine crystal strengthening effect, so that the strength of the composite material can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature lubricating composite materials, and in particular relates to a method for preparing a nickel-based high-temperature lubricating composite material reinforced by an in-situ growth solid lubricant. Background technique [0002] The rapid development of high-tech industries such as aerospace and nuclear industry has put forward higher requirements for the friction and wear properties of materials in service under extremely harsh working conditions (high temperature, high load, high speed, etc.), such as: higher temperature resistance, lubrication And wear resistance, the wear resistance and lubrication of related moving parts under harsh conditions have become the technical key that affects the reliability and life of the entire equipment operation. Therefore, it is urgent to use the basic knowledge of materials science to construct high-strength high-temperature lubricating composite mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C32/00C22C19/05C22C30/00B22F3/14
CPCB22F3/14B22F2998/10B22F2999/00C22C1/058C22C19/056C22C30/00C22C32/0026B22F2009/043B22F3/02B22F2201/20
Inventor 李博高义民李聪康云川郑巧玲李烨飞皇志富赵四勇
Owner 咸阳瞪羚谷新材料科技有限公司
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