CN104846320A - Hard Co-SiC-Fe nano-coating materials and preparation method thereof - Google Patents

Abstract

The invention relates to hard Co-SiC-Fe nano-coating materials and a preparation method thereof. The components of the materials and the mass percentages of the components are as follows: 32 to 59 parts of Co, 28 to 48 parts of SiC, 13 to 31 parts of Fe, 1 part of Al2O3, and 0.23 to 0.62 parts of microelements, wherein the microelements comprise Gr, W, Ti, Cu, and Zn, and the preparation method comprises the steps of preparing nanospheres of Co-SiC-Fe by adopting a gas atomization method; blending the prepared nanospheres with Gr, W, Ti, Cu and Zn by adopting an active agent protection method to prepare nano powder. The materials provided by the invention are in the shapes of spherical particles, are distributed uniformly, and have better structures and macro-properties, and the particles are integrated. The hardness of the prepared Co-SiC-Fe nano-coating reaches HRC56, and certain hardness and wear resistance, and high bonding strength and gripping force are realized.

Description

A kind of hard Co-SiC-Fe nano-coating material and preparation method thereof

Technical field

The present invention relates to technical field of hot, is a kind of hard Co-SiC-Fe nano-coating material and preparation method thereof specifically.

Background technology

Thermospray is a kind of surface strengthening technology, is the important component part of surface engineering technology, is the new technology project that China's emphasis is promoted always.It utilizes certain thermal source (as electric arc, plasma spraying or combustion flame etc.) that Powdered or thread metal or non-metallic material are heated to melting or semi-melting state, then stay itself or pressurized air to be ejected into pretreated matrix surface with certain speed by flame, deposit and form a kind of technology with the top coat of various function.

Along with improving constantly engineering mechanical device performance requriements, improving and development of hot-spraying techniques, the application of hot-spraying techniques is mainly limited to the development of thermal spraying material and processing unit.But the outstanding feature of hot-spraying techniques makes again it apply great potential.These features are mainly manifested in: 1, Surface Engineering and being combined in design of material of multiple matrix material have obvious advantage; 2, the chemical composition of material can be adjusted easily; 3, the matrix material of special construction performance can be had by dynamic formation; 4, the compound of multiple material and multiple technologies can obtain excellent performance.Therefore the research of thermal spraying material is the deciding factor of 21 century thermospray development, is also the driving of hot-spraying techniques development.

The material bond strength that traditional spraying technology uses is poor, void content is high, wear no resistance, and is difficult to the growth requirement meeting modern industry.And Novel hot spray material can make up these defects, adopt new technology, novel method, new formula is obtained has high rigidity, high-wearing feature, high corrosion resistance, heterogeneous microstructure is even, and the excellent material of comprehensive mechanical property is to meet the trend that the active demand of people is hot-spraying techniques development.

Summary of the invention

Poor in order to solve conventional coatings wear resistance, the problems such as hardness is lower, the invention provides a kind of hard Co-SiC-Fe nano-coating material and preparation method thereof.

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

A kind of hard Co-SiC-Fe nano-coating material, the mass fraction of its component and each component is that Co accounts for 32-59 part, SiC accounts for 28-48 part, Fe accounts for 13-31 part, Al ₂o ₃account for 1 part, trace element accounts for 0.23-0.62 part, described Al ₂o ₃the 9th grade is ranked, Al in Mohs scale ₂o ₃add as additive, can material mechanical performance be improved.

It is the important source material of producing refractory alloy, Wimet, anti-corrosion alloy, magneticalloy and various cobalt salt that the physics of Co, chemical property determine it.Cobalt base alloy or cobalt-containing alloy steel are used as the heat-resistant part of various high loading and the important meals material of nuclear industry in the blade of gas turbine, impeller, conduit, jet engine, rocket engine, the parts of guided missile and chemical industry equipment.As the binding agent in powder metallurgy, Co can ensure that Wimet has certain toughness.

The hardness of SiC is very large, and Mohs' hardness is 9.5 grades, and be only second to diamond (10 grades) the hardest in the world, having excellent heat conductivility, is a kind of semi-conductor, can be anti-oxidant during high temperature.

Described trace element is Gr, W, Ti, Cu, Zn.Described Gr is Graphene, and Graphene (Graphene) is a kind of Two-dimensional Carbon material, is the general designation of single-layer graphene, bilayer graphene and few layer graphene.Graphene is thin, the hardest nano material in known world, can significantly improve coating hardness.

A preparation method for hard Co-SiC-Fe nano-coating material, comprises the following steps:

(1) aerosolization legal system is adopted to obtain the nanometer ball of Co-SiC-Fe;

(2) mixing of promoting agent protection method Gr, W, Ti, Cu, Zn is adopted by nanometer ball obtained in step (1) to obtain nanometer powder.

The invention has the beneficial effects as follows: pattern of the present invention is spherical particle, be evenly distributed, particle is complete, there is good weave construction and good macro property.The hardness of the Co-SiC-Fe nano coating that the present invention makes can reach HRC56, has certain hardness and wear resistance, and bonding strength, grasping force are higher, and density can reach 9.252g/cm ³, coating thickness can reach 4 millimeters, and density is well 0.83, and over-all properties is better than conventional washcoat material, and hardness is high, wear resistance is good has very large progress compared with conventional alloys material.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the present invention is further described.

Fig. 1 is the present invention's weave construction under a scanning electron microscope and crystal morphology.

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 hard Co-SiC-Fe nano-coating material, the mass fraction of its component and each component is that Co accounts for 32 parts, SiC accounts for 28 parts, Fe accounts for 13 parts, Al ₂o ₃account for 1 part, trace element accounts for 0.23 part.

Described trace element is Gr, W, Ti, Cu, Zn.

A preparation method for hard Co-SiC-Fe nano-coating material, comprises the following steps:

(1) aerosolization legal system is adopted to obtain the nanometer ball of Co-SiC-Fe;

(2) mixing of promoting agent protection method Gr, W, Ti, Cu, Zn is adopted by nanometer ball obtained in step (1) to obtain nanometer powder.

Embodiment two:

A kind of hard Co-SiC-Fe nano-coating material, the mass fraction of its component and each component is that Co accounts for 38 parts, SiC accounts for 35 parts, Fe accounts for 21 parts, Al ₂o ₃account for 1 part, trace element accounts for 0.28 part.

Described trace element is Gr, W, Ti, Cu, Zn.

A preparation method for hard Co-SiC-Fe nano-coating material, with embodiment one.

Embodiment three:

A kind of hard Co-SiC-Fe nano-coating material, the mass fraction of its component and each component is that Co accounts for 46 parts, SiC accounts for 42 parts, Fe accounts for 28 parts, Al ₂o ₃account for 1 part, trace element accounts for 0.46 part.

Described trace element is Gr, W, Ti, Cu, Zn.

A preparation method for hard Co-SiC-Fe nano-coating material, with embodiment one.

Embodiment four:

A kind of hard Co-SiC-Fe nano-coating material, the mass fraction of its component and each component is that Co accounts for 59 parts, SiC accounts for 48 parts, Fe accounts for 31 parts, Al ₂o ₃account for 1 part, trace element accounts for 0.62 part.

Described trace element is Gr, W, Ti, Cu, Zn.

A preparation method for hard Co-SiC-Fe nano-coating material, with embodiment one.

With reference to Fig. 1, adopt supersonic spray coating technology obtained Co-SiC-Fe nano coating on the rod class workpiece being matrix with 20Co steel, the matrix with described coating and bonding strength, microhardness, void content and the abrasive wear resistance contrast and experiment without the matrix of described coating are in table 1:

The performance comparison experimental result of table 1 Co-SiC-Fe nano coating and 20Co steel matrix:

Experimental group is numbered	Porosity (AREA%)	Bonding strength (MPa)	Microhardness (HV)
				1	0.346	64.3	1025
2	0.457	59.5	948
				3	0.347	64.8	921
4	0.485	57.9	1063
				Mean value	0.409	61.6	989
Comparative group	0.438	52.3	933

Adopt supersonic spray coating technology obtained Co-SiC-Fe coating on the rod class workpiece being matrix with 20Co steel, the abrasion loss contrast and experiment of the matrix with described coating and the matrix without described coating is in table 2:

The abrasion loss contrast and experiment of table 2 Co-SiC-Fe nano coating and 20Co steel matrix:

Experimental group is numbered	Before wearing and tearing (g)	After wearing and tearing (g)	Abrasion loss (g)
				1	71.4748	71.4719	0.0029
2	71.3668	71.3644	0.0024
				3	71.7397	71.7363	0.0034
4	71.6996	71.6974	0.0022
				Comparative group	71.5855	71.5814	0.0041

From table 1 and table 2, the excellent combination property of Co-SiC-Fe nano coating, wear resistance is good.

The present invention is applicable to supersonic spray coating, available spraying steel have: S136,4Cr13, Cr12MoV, Cr12,4Cr5W2VSi, 8Cr3 etc., also can spray some to the higher workpiece of hardness requirement or tool steel surface process, to improve workpiece surface hardness and wear resistance.

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 (2)

1. a hard Co-SiC-Fe nano-coating material, is characterized in that: the mass fraction of its component and each component is that Co accounts for 32-59 part, SiC accounts for 28-48 part, Fe accounts for 13-31 part, Al ₂o ₃account for 1 part, trace element accounts for 0.23-0.62 part;

Described trace element is Gr, W, Ti, Cu, Zn.

2. a preparation method for hard Co-SiC-Fe nano-coating material, is characterized in that: comprise the following steps:

(1) aerosolization legal system is first adopted to obtain the nanometer ball of Co-SiC-Fe;

(2) mixing of promoting agent protection method Gr, W, Ti, Cu, Zn is adopted by nanometer ball obtained in step (1) to obtain nanometer powder.