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a tic-cr 7 c 3 -cnts/iron-based surface composite material and preparation method thereof

A surface composite material, tic-cr7c3-cnts technology, applied in the field of TiC-Cr7C3-CNTs/iron-based surface composite materials and its preparation, can solve the problems of weakening the wettability of agglomeration tendency and difficult to avoid agglomeration, and achieve high Hardness, high process controllability, and simple preparation method

Inactive Publication Date: 2016-10-05
SHANGHAI MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A common method is to treat CNTs in the liquid phase S Perform physical methods such as ultrasonic dispersion and mechanical ball milling, and chemical methods such as surface chemical modification and surface modification to weaken the CNT as much as possible. S agglomeration tendency and improve its wettability, however, it is still difficult to avoid the CNT S the reunion

Method used

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  • a tic-cr <sub>7</sub> c <sub>3</sub> -cnts/iron-based surface composite material and preparation method thereof
  • a tic-cr <sub>7</sub> c <sub>3</sub> -cnts/iron-based surface composite material and preparation method thereof
  • a tic-cr <sub>7</sub> c <sub>3</sub> -cnts/iron-based surface composite material and preparation method thereof

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Embodiment 1

[0034] The surface of 304 stainless steel with a size of 50mm×50mm×8mm is subjected to 600 # Polished with water sandpaper, ultrasonically cleaned, and dried with hot air, the weight is 112.580g. Then put the sample into high temperature furnace, 680℃, 68%CO-31%H 2 -1%H 2 O supersaturated carbon atmosphere reacted for 20 hours, and evenly distributed CNTs were grown on the surface of the sample in situ. Then weigh 113.329g, and the incremental part before and after the reaction is the weight of the incremental carbon. figure 1 In-situ self-generated CNTs on the surface of 304 stainless steel S Morphology, among which, picture (a) is the SEM image of 304 steel surface; picture (b) is the CNT image of 304 steel surface S TEM image, as can be seen from the figure, CNT S Uniform distribution, uniform particle size, no agglomeration.

[0035] Then adopt laser cladding synchronous powder feeding technology, the reaction conditions are laser power of 3000W, spot diameter of 10m...

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Abstract

The invention discloses a composite material belonging to the field of surface engineering, and in particular relates to a TiC-Cr7C3-CNTs / iron based surface composite material and a preparation method thereof. The preparation method comprises the following steps: pretreating an Fe-Cr-Ni stainless steel material, then reacting for 18-22 hours in a 680-700 DEG C supersaturated carbon atmosphere containing 68% of CO, 31% of H2 and 1% of H2O to obtain uniformly distributed CNTs on the surface of the stainless steel, and weighing the stainless steel before and after the reaction to obtain a difference value namely the weight of increased carbon; and according to the weight of the increased carbon, weighing Ti powder and Ni powder, mixing the Ti powder and Ni powder, and preparing the TiC-Cr7C3-CNTs / iron based surface composite material by adopting a laser cladding synchronous powder feeding technology. The composite material prepared by the method disclosed by the invention has strong cohesive force with the surface of a metal matrix, is difficult to fall off, and is high in hardness and excellent in acid corrosion resistance. The composite material disclosed by the invention has an extremely significant effect on modifying the surface of a steel and iron material, and expands the application field of steel and iron.

Description

technical field [0001] The invention belongs to the field of material surface engineering, in particular to a TiC-Cr 7 C 3 -CNTs / iron-based surface composite material and its preparation method. Background technique [0002] With carbon nanotubes (CNT S ) The rapid development of preparation technology and its excellent performance are constantly recognized, and the introduction of CNT in the field of metal surface engineering S research has begun to attract academic attention. CNT S The application in surface engineering mainly has the following aspects: friction reduction, wear resistance and corrosion resistance. [0003] Currently for CNT S Difficulties in the study of enhanced metal surface coatings: 1) Due to the S The unique tubular structure with large length-to-diameter ratio, intertwined bending state and high surface energy make it difficult to mix with powder base materials when preparing composite materials; 2) poor compatibility with commonly used metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
CPCC23C24/10
Inventor 吴钱林李文戈钟宁刘伯洋胡肇炜尹莉
Owner SHANGHAI MARITIME UNIVERSITY
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