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A graphite/metal matrix self-lubricating composite material and its 3D printing preparation method

A 3D printing and composite material technology, which is applied in the field of graphite/metal-based self-lubricating composite materials and their 3D printing preparation, can solve the problem that graphite cannot be prepared with gradient distribution and local distribution composite materials, it is difficult to increase the amount of graphite added, and it is difficult to control graphite Distribution and other issues, to achieve the effect of controllable graphite distribution, good self-lubricating and anti-friction performance, and controllable graphite content

Active Publication Date: 2022-04-12
GUANGDONG INST OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the conventional graphite particle or graphite fiber modified metal matrix composite material stirring casting method is used to prepare graphite / metal matrix composite materials. Although the production cost is low, it is difficult to control the distribution of graphite and increase the amount of graphite added. Moreover, it is impossible to prepare composite materials with gradient distribution and local distribution of graphite; the preparation of graphite / metal matrix composite materials by powder metallurgy method can improve the distribution of graphite and greatly increase the amount of graphite added, but the production cycle is long and the efficiency is low. The cost is high, and the density of the product is low, and graphite and metal are easy to oxidize during the long-term high-temperature sintering process of the composite blank

Method used

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  • A graphite/metal matrix self-lubricating composite material and its 3D printing preparation method
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Experimental program
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preparation example Construction

[0023] The 3D printing preparation method of the above-mentioned graphite / metal-based self-lubricating composite material comprises the following steps:

[0024] (1) Prepare flake graphite powder and metal powder according to the performance index requirements, and dry the powder;

[0025] (2) Prepare the mixed powder of flake graphite powder and metal powder according to the ratio;

[0026] (3) Graphite / metal composites were directly prepared by selective laser sintering (SLS) or selective laser melting (SLM).

[0027] In step (1), the drying treatment process of flake graphite powder and metal powder is as follows: drying temperature is 100-150°C, and drying time is 0.5h-24h.

[0028] In the step (2), in the prepared mixed powder, the volume ratio of flake graphite powder to metal powder is 1:99˜50:50. The larger the proportion of graphite powder, the better the self-lubricating and anti-friction performance, thermal conductivity, and corrosion resistance of the composite ...

Embodiment 1

[0031] Example 1: Preparation of graphite / stainless steel self-lubricating composite material by using mixed powder of graphite and stainless steel and selective laser sintering (SLS method)

[0032] (1) Prepare flake graphite powder and stainless steel powder according to the requirements of performance indicators, both of which are screened for spherical or nearly spherical particles, with an average particle size of 38 μm. The two powders were dried separately at a drying temperature of 120° C. and a drying time of 5 hours.

[0033] (2) Put the prepared graphite powder and stainless steel powder into the ball mill according to the proportion, mix and ball mill for 2 hours and take out. Wherein the volume ratio of graphite powder input is 25%.

[0034](3) The graphite / stainless steel self-lubricating composite material is prepared by the laser selective sintering method (SLS method). At this time, the thickness of the powder layer is 40 μm, and the laser power is 80 KW to 1...

Embodiment 2

[0036] Embodiment 2: Prepare graphite / stainless steel self-lubricating composite material by using mixed powder of graphite and stainless steel and selective laser melting method (SLM method)

[0037] (1) Prepare flake graphite powder and stainless steel powder according to the requirements of performance indicators, both of which are screened for spherical or nearly spherical particles, with an average particle size of 48 μm. These two kinds of powders were dried separately at a drying temperature of 150° C. and a drying time of 12 hours.

[0038] (2) Put the prepared graphite powder and stainless steel powder into the rod mill according to the proportion, mix and ball mill for 3 hours and take it out. Wherein the volume ratio of graphite powder input is 50%.

[0039] (3) Graphite / stainless steel self-lubricating composite materials are prepared by laser selective melting method (SLM method). At this time, the thickness of the powder layer is 50 μm, and the laser power is 14...

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Abstract

The invention provides a graphite / metal-based self-lubricating composite material and a 3D printing preparation method thereof. The composite material is composed of dispersed flake graphite particles or clusters and a metal matrix. The graphite distribution density and distribution position can be changed according to product performance requirements, and the volume ratio of flake graphite is 1% to 50%. The preparation method is as follows: (1) prepare flake graphite powder and metal powder according to the performance index requirements, and dry the powder; (2) prepare the mixed powder of flake graphite powder and metal powder; (3) adopt laser selective sintering method Or direct preparation of graphite / metal matrix self-lubricating composites by laser selective melting. The composite material has a wide graphite content range, good self-lubricating and friction-reducing properties, and also has high strength, toughness, thermal conductivity, corrosion resistance and low thermal expansion. The invention can be used to manufacture structural / functional components in the fields of machinery, electronics, chemical industry, environmental protection, aerospace and the like.

Description

technical field [0001] The invention relates to the technical fields of 3D printing (additive manufacturing) and metal-based composite materials, in particular to a graphite / metal-based self-lubricating composite material and a 3D printing preparation method thereof. Background technique [0002] There are a large number of metal assemblies that require surface lubrication and friction reduction in mechanical equipment. The common method is to use lubricating oil or grease. The use effect is poor and the service life is short. At this time, solid lubricants such as flake graphite and molybdenum disulfide have obvious advantages. [0003] Utilizing the high-temperature lubricating properties of flake graphite to prepare graphite-modified metal-based self-lubricating and anti-friction composite materials is a new hot spot in the field of composite material technology. In the prior art, the conventional graphite particle or graphite fiber modified metal matrix composite materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C32/00B33Y70/10C22C1/10B22F3/105
CPCC22C1/05C22C32/0084B33Y70/10Y02P10/25
Inventor 冯胜山詹春毅张小明卞青青梁玉陈建丽黄东吴维锋曾锦成陈泽辉谭水新区晓明李景辉李冠诚覃钧华冯贵燃
Owner GUANGDONG INST OF SCI & TECH
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