A kind of preparation method of carbon fiber powder reinforced tungsten matrix composite material

Abstract

The invention discloses a preparation method for a carbon fiber powder reinforced tungsten-based composite material. The preparation method is achieved in the way that tungsten powder and carbon fiberpowder pretreated through rhenium plating are taken as raw materials to undergo raw material treatment, laser sintering, sample post-treatment and other steps correspondingly. According to the preparation method, the preparation process is simple, energy saving and emission reduction are achieved, the effect of being environment-friendly is achieved, in the case of the prepared composite material, the crystallinity is good, the density is high, the average density is 17.32 g / cm<3>, the average relative density is 98.97%, the product hardness is high, the average hardness can reach up to 340.9HV0.2, the toughness is good, the minimum fracture toughness is 6.5 MPa.m<1 / 2>, no degreasing process is adopted, so that the deformation problem caused by the complex degreasing process is avoided,in addition, the rhenium on the surface of the carbon fiber powder successfully blocks direct contact between the carbon and the tungsten, and the rhenium has excellent wettability to the tungsten, sothat a composite material interface transition layer is formed, the interface problem in the preparation process is solved, the preparation procedure of the product prepared through the method is greatly shortened compared with a traditional vertical fusion sintering method, and the preparation method can be developed into a 3D printing technology downstream to realize the direct production of the terminal product.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of carbon fiber powder reinforced tungsten-based composite materials. Background technique [0002] Pure metal tungsten has a melting point of 3410°C and is an ideal material for preparing filaments and high-temperature thermocouples. However, metal tungsten has poor shock resistance and cannot meet the requirements for use in harsh vibration environments. In order to improve the performance of tungsten and its alloys in this case, high melting point noble metal elements are often added to tungsten, and the high toughness of these metals is used to improve the overall toughness of the alloy. But the addition of these precious metals directly increases the manufacturing cost of tungsten-based alloys. [0003] Carbon fiber is a one-dimensional micro-nano material with high strength and high modulus of elasticity with a carbon content of...

AI Technical Summary

Problems solved by technology

Degreasing includes a variety of methods, such as thermal degreasing, solvent degreasing, catalytic degreasing, siphon degreasing, etc. Thermal degreasing and solvent degreasing are the most commonly used methods, but thermal degreasing is slow and prone to defects, and the solvent degreasing process is complex and has deformation, etc. question

The production cycle of tungsten-based alloy prepared by vertical fusion sintering is long, the energy consumption is high, and it is not friendly to the environment. Composite materials also have interface problems. The ideal interface of composite materials is a highly flexible phase between the matrix and the reinforcing phase, while the composite of carbon fiber and tungsten is prone to react to form a brittle tungsten carbide phase, which eventually leads to poor overall performance of the product.

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