CN104264093A

CN104264093A - Fe-Gr-Ni nanometer coating and preparation method thereof

Info

Publication number: CN104264093A
Application number: CN201410465007.0A
Authority: CN
Inventors: 程敬卿; 薛卫昌
Original assignee: Wuhu Dinghan Remanufacturing Technology Co Ltd
Current assignee: Wuhu Dinghan Remanufacturing Technology Co Ltd
Priority date: 2014-09-11
Filing date: 2014-09-11
Publication date: 2015-01-07

Abstract

The invention discloses a Fe-Gr-Ni nanometer coating and a preparation method thereof. The Fe-Gr-Ni nanometer coating comprises the following components by mass percent: 58-69 percent of Fe, 11-26 percent of Gr, 11-26 percent of Ni, 0.8-9 percent of trace elements and less than or equal to 1 percent of CBN, wherein the trace elements comprise Go, Si and B. The preparation method comprises the following steps: firstly preparing Fe, Gr and Ni nanospheres based on a dry grinding method; then mixing Go, Si and B to obtain nanometer powder based on an active agent protection method and simultaneously adding the additive CBN; and preparing the Fe-Gr-Ni nanometer coating by using a supersonic flame spraying technology. The Fe-Gr-Ni nanometer coating and the preparation method thereof solve the problems of poor abrasion resistance and low corrosion resistance of the existing coatings, improve the microtexture and structure of the surface coatings of materials with the elastic modulus increased by 8.5-14.4 percent, and have a remarkable effect in improving the improved comprehensive mechanical performances.

Description

A kind of Fe-Gr-Ni nano coating and preparation method thereof

Technical field

The present invention relates to technical field of hot, is a kind of Fe-Gr-Ni nano coating and preparation method thereof specifically.

Background technology

Thermospray is that certain, solid materials melted and accelerating jetting, on surface of the work, forms special thin layer to one specific equipment, to improve the brand-new material Surface Science technology of the performances such as parts are anti-corrosion, wear-resisting, high temperature resistant.With the fastest developing speed in thermospray is hypersonic flame spraying (High Velocity Oxy fuel is called for short HVOF), and HVOF is a kind of New Hot Spraying Technique grown up on the basis of common flame spraying early 1980s.It utilizes hydrogen, acetylene, propylene, kerosene etc. to do fuel, ignition dope is made with oxygen, burn in combustion chamber or special nozzle, produce up to 2000-3000 DEG C, the Supersonic quick burning flame of more than 2100m/s speed, send in flame by powder, produce the particle of fusing or semi-molten, high-speed impact is formation of deposits coating on matrix surface simultaneously, its coating than common flame spraying or plasma spraying bonding strength higher, finer and close.

But this technology requires strict to spraying particle size range, in order to meet the expansion of hypersonic flame spraying technology range of application, people need the coated material of hypersonic flame spraying technology that is a large amount of, that be applicable to various service requirements.

Summary of the invention

For above-mentioned technical problem, the invention provides a kind of Fe-Gr-Ni nano coating and preparation method thereof.

Technical problem to be solved by this invention realizes by the following technical solutions:

A kind of Fe-Gr-Ni nano coating, the mass percent of its component and each component is that Fe accounts for that 58%-69%, Gr account for that 11%-26%, Ni account for 11%-26%, trace element accounts for 0.89%, CBN≤1%; Described trace element comprises Go, Si, B.

A kind of preparation method of Fe-Gr-Ni nano coating, comprise the following steps: first adopt dry type comminuting method to obtain the nanometer ball of Fe, Gr and Ni, adopt promoting agent protection method to mix Go, Si, B again and obtain nanometer powder, add auxiliary agent CBN simultaneously, adopt hypersonic flame spraying technique to prepare Fe-Gr-Ni nano coating afterwards on 20Cr die steel matrix; Described auxiliary agent CBN can improve the hardness 50% of material.

The invention has the beneficial effects as follows: the invention solves the problem that existing coating abrasion performance is poor, erosion resistance is lower, improve the microtexture of material surface coating, structure, coating hardness is made to improve 50%, Young's modulus improves 8.5%-14.4%, thus the overall wear resisting property improving material surface, also there is significant effect to the comprehensive mechanical property improving improvement simultaneously; Described Fe-Gr-Ni nano coating is applicable to multiple steel, is especially applicable to the sclerosis of some material surface needs, but requires not high, cheap again, save cost, reach again the situation of hardened material object.

Embodiment

The technique means realized to make the present invention and creation characteristic are easy to understand, and set forth further below to the present invention.

Embodiment one:

A kind of Fe-Gr-Ni nano coating, the mass percent of its component and each component is that Fe accounts for 56%, Gr accounts for 25%, Ni accounts for 17.3%, trace element accounts for 0.89%, CBN accounts for 0.81%; Described trace element comprises Go, Si, B.

A kind of preparation method of Fe-Gr-Ni nano coating; comprise the following steps: first adopt dry type comminuting method to obtain the nanometer ball of Fe, Gr and Ni; adopt promoting agent protection method to mix Go, Si, B again and obtain nanometer powder; add auxiliary agent CBN simultaneously, adopt hypersonic flame spraying technique to prepare Fe-Gr-Ni nano coating afterwards on 20Cr die steel matrix.

The workpiece of described Fe-Gr-Ni nano coating and the performance comparison experimental result of 20Cr steel matrix are in table 1.

The friction and wear behavior experimental result of the workpiece of described Fe-Gr-Ni nano coating and the friction and wear behavior experimental result of 20Cr steel matrix contrast in table 2.

Embodiment two:

A kind of Fe-Gr-Ni nano coating, the mass percent of its component and each component is that Fe accounts for 62%, Gr accounts for 15%, Ni accounts for 21.6%, trace element accounts for 0.89%, CBN accounts for 0.51%; Described trace element comprises Go, Si, B.

A preparation method for Fe-Gr-Ni nano coating, with embodiment one.

The friction and wear behavior experimental result of the workpiece of described Fe-Gr-Ni nano coating and the friction and wear behavior experimental result of 20Cr steel matrix contrast in table 3.

Embodiment three:

A kind of Fe-Gr-Ni nano coating, the mass percent of its component and each component is that Fe accounts for 65%, Gr accounts for 12%, Ni accounts for 21.8%, trace element accounts for 0.89%, CBN accounts for 0.31%; Described trace element comprises Go, Si, B.

A preparation method for Fe-Gr-Ni nano coating, with embodiment one.

The friction and wear behavior experimental result of the workpiece of described Fe-Gr-Ni nano coating and the friction and wear behavior experimental result of 20Cr steel matrix contrast in table 4.

Described Fe-Gr-Ni nano coating can adopt supersonic flame (HVOF) spraying coating process to prepare Fe-Gr-Ni nano coating on 20Cr die steel matrix.

The workpiece of table 1 Fe-Gr-Ni nano coating and the performance comparison experimental result of 20Cr steel matrix:

Can be obtained by experimental data, Fe-Gr-Ni nano coating effectively can reduce the porosity of workpiece surface, improves the bonding strength of workpiece surface, can increase substantially the microhardness of workpiece surface.

The friction and wear behavior of the Fe-Gr-Ni nano coating of table 2 embodiment one and the friction and wear behavior contrast and experiment of 20Cr steel matrix:

Group	Before test (g)	After test (g)	Loss (mg)
				Embodiment one	66.2417	66.2404	1.3
Control group	71.9714	71.9541	17.3

The friction and wear behavior of the Fe-Gr-Ni nano coating of table 3 embodiment two and the friction and wear behavior contrast and experiment of 20Cr steel matrix:

Group	Before test (g)	After test (g)	Loss (mg)
				Embodiment two	64.3584	64.3570	1.4

Control group

69.8641

69.8475

16.6

The friction and wear behavior of the Fe-Gr-Ni nano coating of table 4 embodiment three and the friction and wear behavior contrast and experiment of 20Cr steel matrix:

Group	Before test (g)	After test (g)	Loss (mg)
				Embodiment three	69.2574	69.2560	1.4
Control group	74.3872	74.3689	18.3

From table 2, table 3 and table 4, Fe-Gr-Ni coating prepared by HVOF has excellent abrasive wear resistance, significantly can reduce the Surface Wear amount of workpiece, ensure the lasting wear resistance of workpiece, significantly extend the work-ing life of workpiece, and show according to another test, at identical conditions, the abrasion loss of 20Cr is about 13 times of Fe-Gr-Ni coating.

The Fe-Gr-Ni nano coating hardness that Fe-Gr-Ni nano coating is made reaches as high as HRC58, the coating thickness of Fe-Gr-Ni nano coating can reach 3 millimeters, show that the density of the bonding strength of Fe-Gr-Ni nano coating, tissue is better through test of many times, the density of Fe-Gr-Ni nano coating can reach 8.96g/cm ³.

Fe-Gr-Ni nano coating is better than conventional washcoat material, has the advantages that hardness is high, wear resistance is good, has very large progress compared with conventional alloys material, is modern mechanical manufacturing and abrasion piece reparation important materials again.

More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; the just principle of the present invention described in above-described embodiment and specification sheets; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.

Claims

1. a Fe-Gr-Ni nano coating, is characterized in that: the mass percent of its component and each component is that Fe accounts for that 58%-69%, Gr account for that 11%-26%, Ni account for 11%-26%, trace element accounts for 0.89%, CBN≤1%; Described trace element comprises Go, Si, B.

2. the preparation method of a Fe-Gr-Ni nano coating; it is characterized in that: comprise the following steps: first adopt dry type comminuting method to obtain the nanometer ball of Fe, Gr and Ni; adopt promoting agent protection method to mix Go, Si, B again and obtain nanometer powder; add auxiliary agent CBN simultaneously, adopt hypersonic flame spraying technique to prepare Fe-Gr-Ni nano coating afterwards on die steel matrix.