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Novel tough particle strengthened iron-based amorphous composite coating

An iron-based amorphous alloy and composite coating technology, which is applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of low bonding strength and poor ductility, and achieve low cost and enhanced coating polymerization. Force, improve the effect of deformation ability and impact resistance

Inactive Publication Date: 2014-06-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a tough iron-based amorphous-based composite coating with good bonding strength with the metal substrate to solve the shortcomings of low bonding strength and poor ductility of the current single-phase iron-based amorphous alloy coating

Method used

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  • Novel tough particle strengthened iron-based amorphous composite coating
  • Novel tough particle strengthened iron-based amorphous composite coating
  • Novel tough particle strengthened iron-based amorphous composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First, the master alloy is prepared by vacuum induction melting according to the required composition. The alloy composition is Fe48.5Mo13.5Cr15.3Y2C14.5B6.2 (at.%). Put the master alloy into the atomization furnace and atomize it by gas Technology to prepare amorphous alloy powder. The 316L stainless steel powder with a mass fraction of 9% was mixed with the amorphous alloy powder, and uniformly mixed by low-energy ball milling to make a composite powder raw material. The 316L stainless steel powder is a commercially available product, and the particle size of the powder is 20-55um.

[0032] The supersonic flame spraying technology is used to prepare the iron-based amorphous matrix composite coating, and the specific spraying process parameters are: kerosene flow rate 20l / h -1 , oxygen flow 36m 3 / h -1 , spraying distance 300mm, powder feeding rate 25g / min -1 . Such as figure 1 As shown, the main body of the prepared amorphous-based composite coating is still amo...

Embodiment 2

[0038] This embodiment differs from Embodiment 1 in that:

[0039] (1) The mass fraction of 316L stainless steel powder contained in the composite coating prepared in this example is 16%, such as figure 2 as shown in b;

[0040] (2) The microhardness of the composite coating prepared in this example is 794Hv;

[0041] (3) The bonding strength of the composite coating prepared in this example reaches 45MPa, such as image 3 shown;

[0042] (4) The bending strain of the composite coating prepared in this example reaches 0.90%, such as Figure 4 shown.

Embodiment 3

[0044] This embodiment differs from Embodiment 1 in that:

[0045] (1) The composite coating prepared in this example contains nickel-based metal powder (Cr17Al5, Ni balance) with a mass fraction of 20%;

[0046] (2) The spraying process parameters of this embodiment are: kerosene flow rate 22l / h -1 , oxygen flow 36m 3 / h -1 , spraying distance 350mm, powder feeding rate 22g / min -1 ;

[0047] (3) The bonding strength of the composite coating prepared in this example is 46MPa;

[0048](4) The porosity of the composite coating prepared in this example is lower than 0.7%.

[0049] Those skilled in the art should know that the ductile particles used for strengthening in the present invention are not limited to the 316L stainless steel powder and nickel-based metal powder (Cr17Al5, Ni balance) in the examples. Stainless steel powder (316, 316L, 304, etc.), nickel-based metal powder (NiCrAl, NiAl, NiCr, NiP, pure Ni, etc.), cobalt-based metal powder (CoNi, CoAl, pure Co, etc.)...

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Abstract

The invention provides a novel tough particle strengthened iron-based amorphous composite coating. The mechanical composite powder of iron-based amorphous alloy powder and tough metal powder is used as a raw material, wherein the iron-based amorphous alloy powder consists of the following elements and unavoidable impurities in percentage by atom: 10.0-17.0% of Cr, 12.0-20.0% of Mo, 4.0-8.0% of B, 10.0-18.0% of C, 0.0-5.0% of Y and the balance of Fe; the tough metal powder can be stainless steel powder, nickel-based metal powder, cobalt-based metal powder, aluminum-based metal powder or copper-based alloy powder; the coating is prepared by the high velocity oxy-fuel technology. The iron-based amorphous composite coating provided by the invention has dense structure, low porosity, relatively high toughness and good bonding strength with the metal substrate. The composite coating has great application prospects in the industrial fields such as waterpower and oil-gas field development facilities, pipeline transportation, ship decks and the like.

Description

technical field [0001] The invention relates to an iron-based amorphous-based composite coating and a method for preparing the composite coating, belonging to the field of composite coatings. Background technique [0002] Hypersonic flame spraying (HVOF) is a spraying technology that appeared in the 1980s. It mainly uses the Laval curve design at the end of the combustion chamber to increase the pressure of the combustion chamber, and the flame flow through the place is several times the speed of sound. The flame temperature reaches 2500°C. The coating prepared by supersonic flame spraying has low porosity, high hardness, and the thickness of the coating can reach several mm, so it is widely used in many industrial sectors. Most of the powder materials used in supersonic spraying are obtained by gas atomization method. The gas atomization method mainly uses high-speed air flow and high-speed impact liquid metal flow to atomize it into small liquid droplets and then solidify...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/12C22C45/02C23C4/129
Inventor 柳林周欢张诚
Owner HUAZHONG UNIV OF SCI & TECH
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