Gradient porosity porous metal material and preparation method thereof

Abstract

The invention discloses a porous metal material with gradient porosity and a preparation method of the porous metal material. The open porosity of the porous metal material with gradient porosity ranges from 5% to 35% and presents gradient change in a certain direction with the size of 1-3 cm, the gradient change ranges from 25 layers as minimum to 55 layers as maximum, and the pore diameter of the porous metal material with gradient porosity ranges from 5 mu m to 50 mu m. The preparation method of the porous metal material with gradient porosity comprises the steps of preparing metal powder and a non-metal substrate; spraying the metal powder to the non-metal substrate with a low-temperature supersonic spray technology; and separating the porous metal material with gradient porosity from the non-metal substrate. The porous metal material with gradient porosity can have the thickness of 1-3 cm formed by deposition of more than 20 deposit layers with progressively increased or decreased porosity, and is the porous metal material with gradient porosity in real sense.

Description

technical field [0001] The invention relates to a porous metal material and a preparation method thereof, in particular to a gradient porosity porous metal material and a preparation method thereof. Background technique [0002] Porous material has high specific strength, high specific stiffness, good oil storage, noise reduction, shock resistance, light weight and other characteristics. It is an engineering material with excellent performance with both functional and structural properties. Machinery, petrochemical, environmental protection, medicine and other fields. For porous materials with uniform porosity, if the porosity is high, the oil storage rate is high, but the strength and stiffness are poor, which restricts the application of high-porosity porous materials as bearing parts such as bearings; if the porosity If the rate is lower, the strength and stiffness will be higher, but the oil storage rate will be limited, making it difficult to exert the self-lubricating...

AI Technical Summary

Problems solved by technology

When using sintering method to prepare porous materials, due to many factors affecting the sintering process, it is difficult to control accurately, and it is impossible to prepare materials with gradient porosity in the true sense; while the pores prepared by rapid prototyping technology are mostly regular through-holes, and the pores Oversized so oil storage performance is limited

[0005] In addition, there are also reports in the literature that a multi-layer porous material composed of up to four layers of materials with different porosities laminated together, and due to the limitation of the number of layers, there is still a difference in porosity at the interface of different layers of this material. mutation, its gradient change is discontinuous, and it does not belong to the gradient porosity material in the true sense.

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