Modified MXenes powder as well as preparation method and application thereof

Abstract

The invention discloses modified MXenes powder as well as a preparation method and application thereof. The modified MXenes powder is prepared from a MXenes matrix which is of a layer structure and anano metal particle which is distributed between layers and / or on the external surface of the MXenes matrix; the modified MXenes powder is prepared through a metal ion intercalation method; the modified MXenes powder is used as a reinforcing phase to reinforce a metal material; and an obtained metal based composite material not only has excellent mechanical characteristics of high strength, high hardness, high wear resistance and high ductility and the like, but also has favorable electric conductivity and heat conductivity.

Description

technical field [0001] The invention relates to the field of two-dimensional sheet materials and composite materials, in particular to a modified MXenes powder and its preparation method and application. Background technique [0002] The new two-dimensional crystal material (MXenes) is a two-dimensional layered transition metal carbide (or nitride) obtained by etching away the A-site atomic layer of the MAX phase by chemical selective etching. The MAX phase is a ternary layered compound whose general structural formula is M n+1 AX n , where M is a transition metal element, A is mainly IIIA and IVA group elements, and X is C or N element. At present, more than 60 kinds of single-phase MAX materials have been synthesized, the typical ones are Ti 2 AlC, Ti 2 SnC, Cr 2 AlC, V 2 GeC, Ti 2 AlN, Ti 3 SiC 2 、Ti 3 AlC 2 、Ti 4 AlN 3 Wait. The bond between the M-site atom and the X-site atom is strong, and the bonding type is a mixture of covalent bond, ionic bond and met...

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Problems solved by technology

However, MXenes prepared by chemical etching often have functional groups such as F, OH, and O. The presence of these functional groups changes the surface properties of MXenes and weakens the interfacial bonding between MXenes and metal substrates.

[0003] CN108275683A discloses a metal matrix composite material and its preparation method and application. The metal matrix composite material includes a metal base and a material with M directly coated on the surface of the metal base. n+1 x n The MXene material film layer of the structural formula (Ts), n is a positive integer, and Ts is the end-capping group on the surface of the MXene material, and the metal matrix composite material surface prepared by the present invention is evenly covered by the MXene material film layer, wherein the sheet of the MXene material The number of layers is only 1 to 15 layers, the thickness of the coating is less than 250nm, the thickness is uniform, the surface of the coating is smooth and flat, and there is no surface defect. The corrosion rate of the obtained metal matrix composite is very low, which is only the corrosion rate of the original metal substrate 0.06%, the present invention also proposes a new method for preparing the metal matrix composite material, which does not require complicated instruments and equipment, and can conveniently and quickly prepare the metal matrix composite material, but the The MXene materials mentioned above contain functional groups such as F, OH, and O, which weaken the interfacial bonding characteristics between MXenes and Cu matrix, and have a negative impact on the performance of metal matrix composites.

At the same time, the "electronic coupling" effect between the MXenes material and the metal matrix interface is better, which can avoid the problem in the prior art that the reinforcing phase can improve the mechanical properties and corrosion resistance of metal matrix composites while reducing its thermal conductivity, but the invention The adverse effects brought by functional groups such as F, OH, and O are not considered, and it is difficult to obtain high-performance composite materials

[0005] "Preparation and Properties of MXene / Copper Alloy Composite Materials", Si Xiaoyang et al., "Journal of Inorganic Materials" Volume 33 No. 6 discloses a preparation method and performance research of MXene / copper alloy composite materials, using molecular Ti 3 C 2 T x 5vol%, 10vol% and 20vol% Cu / Ti 3 C 2 T x composite materials, studied the Ti 3 C 2 T x The effect of content on the conductivity, mechanical properties and friction and wear properties of copper matrix composites, but no effect on Ti 3 C 2 T x After a certain treatment, there are still functional groups such as F, OH, and O, which affect the Ti 3 C 2 T x Wettability with copper alloys, difficult to obtain high performance composites

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