CN104831222A - Co-TiO2-Mo nanocoating material and preparation method thereof - Google Patents

Abstract

The invention relates to a Co-TiO2-Mo nanocoating material and a preparation method thereof. The Co-TiO2-Mo nanocoating material comprises the following components in parts by mass: 58-77 parts of Co, 6-19 parts of TiO2, 9 parts of Mo, 1 part of Al2O3 and 0.18-0.88 part of trace elements, wherein the trace elements comprise W, Al, Cu and Gr. The preparation method comprises the following steps: preparing Co-TiO2-Mo nanospheres by adopting a gas atomization method; and then mixing the prepared nanospheres with W, Al, Cu and Gr to prepare nanopowder by adopting an active agent protection method. The Co-TiO2-Mo nanocoating material has the advantages of complete particles, relatively good tissue structure and relatively good macro-performance. A Co-TiO2-Mo nanocoating prepared from the Co-TiO2-Mo nanocoating material provided by the invention has the hardness of HRC44, and has certain hardness and wear resistance and relatively high bonding strength and grabbing force.

Description

Co-TiO 2-Mo nano-coating material and preparation method thereof

Technical field

The present invention relates to technical field of hot, is a kind of Co-TiO specifically ₂-Mo nano-coating material and preparation method thereof.

Background technology

Thermospray is by the spray material of molten state, makes its atomised jet on piece surface by high velocity air, forms a kind of metallic surface working method of sprayed coating.We are special working-surface " coating ", and manufacturing the method for work of coating " thermospray ", it is the general name adopting various thermal source to carry out spraying and surfacing.

Hot-spraying techniques has following several respects outstanding advantages: 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.

Based on this, 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.

But the material bond strength that traditional spraying technology uses is poor, void content is high, wear no resistance.Novel hot spray material needs to make up these defects, and 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 becomes the urgent demand of people.

Summary of the invention

Poor in order to solve conventional coatings wear resistance, the problems such as hardness is lower, the invention provides Co-TiO ₂-Mo nano-coating material and preparation method thereof.

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

Co-TiO ₂-Mo nano-coating material, the mass fraction of its component and each component is that Co accounts for 58-77 part, TiO ₂account for 6-19 part, Mo accounts for 9 parts, Al ₂o ₃account for 1 part, trace element accounts for 0.18-0.88 part, described Al 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 pure metal of Mo is silvery white, very hard, and a small amount of Mo is added among coating, can improve coating hardness.

TiO ₂adhesivity good, coating difficult drop-off, and TiO ₂heat stability is good, high temperature resistant.

Described trace element is W, Al, Cu, Gr.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.

Co-TiO ₂the preparation method of-Mo nano-coating material, comprises the following steps:

(1) aerosolization legal system is adopted to obtain Co-TiO ₂the nanometer ball of-Mo;

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

The invention has the beneficial effects as follows: particle of the present invention is complete that there is good weave construction and good macro property.The Co-TiO that the present invention makes ₂the hardness of-Mo nano coating can reach HRC44, has certain hardness and wear resistance, and bonding strength, grasping force are higher, and density can reach 7.241g/cm ³, coating thickness can reach 4 millimeters, and density is well 0.86, 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

Co-TiO ₂-Mo nano-coating material, the mass fraction of its component and each component is that Co accounts for 58 parts, TiO ₂account for 6 parts, Mo accounts for 9 parts, Al ₂o ₃account for 1 part, trace element accounts for 0.18 part.

Described trace element is W, Al, Cu, Gr.

Co-TiO ₂the preparation method of-Mo nano-coating material, comprises the following steps:

(1) aerosolization legal system is adopted to obtain Co-TiO ₂the nanometer ball of-Mo;

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

Embodiment two

Co-TiO ₂-Mo nano-coating material, the mass fraction of its component and each component is that Co accounts for 64 parts, TiO ₂account for 12 parts, Mo accounts for 9 parts, Al ₂o ₃account for 1 part, trace element accounts for 0.35 part.

Described trace element is W, Al, Cu, Gr.

Co-TiO ₂the preparation method of-Mo nano-coating material, with embodiment one.

Embodiment three

Co-TiO ₂-Mo nano-coating material, the mass fraction of its component and each component is that Co accounts for 68 parts, TiO ₂account for 15 parts, Mo accounts for 9 parts, Al ₂o ₃account for 1 part, trace element accounts for 0.70 part.

Described trace element is W, Al, Cu, Gr.

Co-TiO ₂the preparation method of-Mo nano-coating material, with embodiment one.

Embodiment four

Co-TiO ₂-Mo nano-coating material, the mass fraction of its component and each component is that Co accounts for 77 parts, TiO ₂account for 19 parts, Mo accounts for 9 parts, Al ₂o ₃account for 1 part, trace element accounts for 0.88 part.

Described trace element is W, Al, Cu, Gr.

Co-TiO ₂the preparation method of-Mo nano-coating material, with embodiment one.

Composition graphs 1, adopts plasma spraying technology obtained Co-TiO on the rod class workpiece being matrix with 20Co steel ₂-Mo nano coating, 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:

Table 1 Co-TiO ₂the performance comparison experimental result of-Mo nano coating and 20Co steel matrix:

Experimental group is numbered	Porosity (AREA%)	Bonding strength (MPa)	Microhardness (HV)
				1	0.854	69.7	794
2	0.478	70.2	869

3	0.689	74.2	742
				4	0.770	71.8	956
Mean value	0.698	71.5	840
				Comparative group	0.791	67.3	782

Adopt plasma spraying technology obtained Co-TiO on the rod class workpiece being matrix with 20Co steel ₂-Mo coating, the abrasion loss contrast and experiment of the matrix with described coating and the matrix without described coating is in table 2:

Table 2 Co-TiO ₂the abrasion loss contrast and experiment of-Mo nano coating and 20Co steel matrix:

Experimental group is numbered	Before wearing and tearing (g)	After wearing and tearing (g)	Abrasion loss (g)
				1	38.8378	38.8324	0.0054
2	38.5854	38.5811	0.0043
				3	38.8572	38.8533	0.0039
4	38.2637	38.2591	0.0046
				Comparative group	38.6272	38.6215	0.0057

From table 1 and table 2, the excellent combination property of Co-TiO2-Mo nano coating, wear resistance is good.

The present invention is applicable to plasma spraying, available spraying steel D2, SKD11, 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.Co-TiO ₂-Mo nano-coating material, is characterized in that: the mass fraction of its component and each component is that Co accounts for 58-77 part, TiO ₂account for 6-19 part, Mo accounts for 9 parts, Al ₂o ₃account for 1 part, trace element accounts for 0.18-0.88 part;

Described trace element is W, Al, Cu, Gr.

2.Co-TiO ₂the preparation method of-Mo nano-coating material, is characterized in that: comprise the following steps:

(1) aerosolization legal system is adopted to obtain Co-TiO ₂the nanometer ball of-Mo;

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