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Method for preparing Ni-based alloy-TiB2 nano coating

A nano-coating and base alloy technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problems of reducing performance, coating cracking, reducing and other problems

Active Publication Date: 2014-02-19
GUANGDONG ZHENGDE MATERIAL SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is an insurmountable contradiction in the balance between hardness and fracture toughness of coarse-grained coatings—an increase in the hardness of the coating often means a decrease in fracture toughness, resulting in an increase in brittleness of the coating and a decrease in bonding strength. It is prone to hard phase shedding and coating cracking, which seriously reduces its performance

Method used

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  • Method for preparing Ni-based alloy-TiB2 nano coating
  • Method for preparing Ni-based alloy-TiB2 nano coating
  • Method for preparing Ni-based alloy-TiB2 nano coating

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Use mechanical mixing powder, powder including NiCrAl powder and TiB 2 two components. TiB in powder 2 Powder and NiCrAl powder weight percent: TiB 2 40%; NiCrAl is 60%. During preparation, the above two powders were put into a blender and mixed for 10 hours, the speed of the blender was 30r / min, mixed evenly, and packed for later use. After mixing, the NiCrAl powder in the powder is a smooth spherical shape with a particle size in the range of 38-48 μm, and the TiB 2 The average particle size of the powder is about 6 μm.

[0036] The substrate used for spraying is medium carbon steel, and the surface of the substrate is treated with derusting, degreasing and sandblasting before spraying.

[0037] The spraying equipment is the Met-Jet supersonic flame spraying system produced by the British metallisation company. The main spraying process parameters are: spraying distance 260mm, gas pressure 0.55MPa, N 2 The pressure is 0.35MPa, the oxygen pressure is 0.45MPa, and...

Embodiment 2

[0042] Use nano-scale powder formed by high-energy ball milling and sieving, including NiCrAl powder and TiB 2 two components. TiB in powder 2 Powder and NiCrAl powder weight percent: TiB 2 20%; NiCrAl is 80%.

[0043] High performance NiCrAl-TiB was prepared by the following steps 2 Nano powder:

[0044] (1), by weight percentage 2:8 will TiB 2 Add the powder and NiCrAl powder into the mixer for premixing, and the premixing time is 10h.

[0045] (2), the pre-mixed NiCrAl-TiB 2 The mixed powder is taken out, and the stainless steel balls are sequentially added to the ball mill tank at a ratio of 1:20 (weight ratio) for ball milling. In order to avoid the oxidation of the powder during the ball milling process, the tank needs to be evacuated before each ball milling and then filled with high-purity argon. The speed of the ball mill is set at 150r / min. During the ball milling process, stop for 5 minutes after milling for 15 minutes and change direction once. The total mi...

Embodiment 3

[0061] Adopt the same method as embodiment 2 to prepare Ni-Cr-B-Si-Mo alloy powder-TiB 2 nanoscale powder. The powder includes Ni-Cr-B-Si-Mo alloy powder and TiB 2 two components. TiB in powder 2 Powder and NiCrAl powder weight percent: TiB 2 30%; Ni-Cr-B-Si-Mo alloy is 70%.

[0062] The substrate used for spraying is high-carbon steel, and the surface of the substrate is treated with derusting, degreasing and sandblasting before spraying.

[0063] The spraying equipment is the Met-Jet supersonic flame spraying system produced by the British metallisation company. The main spraying process parameters are: spraying distance 260mm, gas pressure 0.5MPa, N 2 The pressure is 0.35MPa, the oxygen pressure is 0.45MPa, and the powder feeding rate is 90g / min.

[0064] In other embodiments, TiB in the powder 2 The weight percentage of the powder can also be 25% or 35%, and the weight percentage of the Ni-Cr-B-Si-Mo alloy powder can also be 65% or 75% accordingly.

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Abstract

The invention discloses a method for preparing a Ni-based alloy-TiB2 nano coating. Powder is sprayed on a base material through supersonic speed flame so as to form a nano-structured coating, wherein the powder comprises two components, namely, 60-80 percent by weight of Ni-based alloy powder, and 20-40 percent by weight of TiB2. The nano coating prepared according to the technical scheme is dense in tissue and uniform in distribution, is of a certain flat layered distribution structure, and is not clear in boundary distribution amount spraying ions. In addition, the prepared nano coating further contains special or elliptical unmelted or semi-melted grains, and due to such a structure, the prepared nano coating has higher bonding strength and better abrasion resistance. Therefore, the comprehensive application property of the protection coating is improved, and the high-temperature corrosion resistance and the erosive wear resistance of 'four tubes' of a boiler are further improved.

Description

technical field [0001] The invention relates to the technical field of nano-coating preparation in metal-based ceramic composite materials, in particular to a Ni-based alloy-TiB 2 Preparation method of nanocoating. Background technique [0002] As a leading industry in the development of the national economy, the electric power industry provides the necessary guarantee for the development of the social economy. my country's special national conditions determine that my country's power generation is dominated by coal power, and coal-fired power generation accounts for about 3 / 4 of the total power generation. In the coal power industry, due to its own characteristics, the "four tubes" of power plant boilers (namely water wall tubes, superheater tubes, reheater tubes and gas-saving tubes) work for a long time under high temperature, ultra-high pressure and flue gas corrosion and corrosion. In the harsh environment of erosion, a series of problems such as erosion wear, dust ac...

Claims

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Application Information

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IPC IPC(8): C23C4/06C22C19/03C22C32/00C23C4/129
Inventor 曾德长吴姚莎李尚周刘仲武余红雅钟喜春
Owner GUANGDONG ZHENGDE MATERIAL SURFACE TECH
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