CN104831224A - Hard WC-Co-B-Ni coating material and preparation method thereof - Google Patents

Abstract

The invention relates to a hard WC-Co-B-Ni coating material and a preparation method thereof. The hard WC-Co-B-Ni coating material comprises the following components in percentage by mass: 53.95% of WC, 13% of Co, 16% of B, 16% of Ni, and 1.05% of microelements, wherein the microelements are Si, Cr, Mn and C; and the prepared nano material has uniform morphology, and complete granules, has relatively good tissue structure and macroproperties, and is high in hardness, good in abrasive resistance, excellent in corrosion resistance and high-temperature oxidation resistance, high in bonding strength and relatively good in tissue density; the coating density is about 8.60g/cm<3>; the thickness of the coating reaches 3mm; and compared with a traditional alloy material, the hard WC-Co-B-Ni coating material has great progress and is an important material for modern machine manufacturing and wear part repairing and reusing.

Description

A kind of hard WC-Co-B-Ni coated material and preparation method thereof

Technical field

The present invention relates to technical field of hot, is a kind of hard WC-Co-B-Ni coated material and preparation method thereof specifically.

Background technology

Hot-spraying techniques utilizes thermal source to be heated to by spray material dissolve or half melting state, and with certain speed jet deposition to the method forming coating through pretreated matrix surface.Hot-spraying techniques is on the surface of common material, manufacture a special working-surface, it is made to reach: anticorrosion, wear-resisting, antifriction, high temperature resistance, anti-oxidant, heat insulation, insulation, conduction, anti-microwave radiation etc. are several functions, it is made to reach saving material, the object of save energy, we special working-surface coating, manufacturing the method for work of coating thermospray.

The degree that in spraying process, matrix surface is heated is less and can control, therefore can carry out spraying on various material (as metal, pottery, glass, cloth Shu, paper, plastics etc.), and the structure and properties of base material is not almost affected, workpiece deformation is also little.In addition, the equipment that thermospray needs is simple, and flexible operation, both can carry out big area spraying to large-scale component, also can spray in the local of specifying; Both can carry out spraying at factory indoor and also can construct at outdoor scene.

Just because of hot-spraying techniques has so many advantage, ten years in the past, hot-spraying techniques development rapidly, spraying equipment is constantly updated, spraying method have also been obtained very large optimization, but the material bond strength that traditional spraying technology uses is poor, void content is high, wear no resistance, hinder the universal of hot-spraying techniques and raising.

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 WC-Co-B-Ni coated material and preparation method thereof.

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

A kind of hard WC-Co-B-Ni coated material, the mass percent of its component and each component is that WC accounts for 53.95%, Co accounts for 13%, B accounts for 16%, Ni accounts for 16%, trace element accounts for 1.05%.

WC is black hexagonal crystal, gray, and be the powder with metalluster, microhardness reaches 17800MPa.WC matter is hard, spring rate is also large, can effectively improve nano coating hardness and wear resistance.

Cobalt base alloy or cobalt-containing alloy steel comprehensive mechanical property are excellent, are to be commonly used for 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 binding agent, Co can ensure that Wimet has certain toughness.

Ni is mixed in nano coating and can improves nano coating physical strength.

Described trace element is Si, Cr, Mn and C.Cr is coated in workpiece surface, can improve the rotproofness of workpiece.

A preparation method for hard WC-Co-B-Ni coated material, comprises the following steps:

(1) aerosolization legal system is adopted to obtain the nanometer ball of WC-Co-B-Ni;

(2) mixing of promoting agent protection method Si, Cr, Mn and C is adopted to obtain nanometer powder.

The invention has the beneficial effects as follows: the appearance of nano material that the present invention obtains is even, particle is complete has good weave construction and good macro property, hardness is high, wear resistance good, the excellent propertys such as anti-corrosion, resistance to high temperature oxidation, bonding strength is high, dense structure's degree better, and coating density is at 8.60g/cm ³left and right, coat-thickness reaches 3 millimeters, has very large progress compared with conventional alloys material, is modern mechanical manufacturing and abrasion piece reparation important materials again.

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.

A kind of hard WC-Co-B-Ni coated material, the mass percent of its component and each component is that WC accounts for 53.95%, Co accounts for 13%, B accounts for 16%, Ni accounts for 16%, trace element accounts for 1.05%.

Described trace element is Si, Cr, Mn and C.

A preparation method for hard WC-Co-B-Ni coated material, comprises the following steps:

(1) aerosolization legal system is adopted to obtain the nanometer ball of WC-Co-B-Ni;

(2) mixing of promoting agent protection method Si, Cr, Mn and C is adopted to obtain nanometer powder.

Composition graphs 1, adopt plasma spraying technology obtained WC-Co-B-Ni coating on the rod class workpiece being matrix with 20Cr 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 WC-Co-B-Ni nano coating and 20Cr steel matrix:

Experimental group is numbered	Porosity (AREA%)	Bonding strength (MPa)	Microhardness (HV)
				1	0.762	72.5	1146
2	0.756	73.5	1013
				3	0.626	71.5	1213
4	0.548	72.4	1167
				Mean value	0.673	72.5	1135
Comparative group	0.799	63.2	896

Adopt plasma spraying technology obtained WC-Co-B-Ni coating on the rod class workpiece being matrix with 20Cr 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 WC-Co-B-Ni nano coating and 20Cr steel matrix:

Experimental group is numbered	Before wearing and tearing (g)	After wearing and tearing (g)	Abrasion loss (g)
				1	69.5632	69.5620	0.0012
2	69.7893	69.7881	0.0012
				3	69.7632	69.7624	0.0008
Comparative group	69.3478	69.3347	0.0131

From table 1 and table 2, the excellent combination property of WC-Co-B-Ni nano coating, wear resistance is good, experiment proves that WC-Co-B-Ni nano coating hardness can reach HRC55, coat-thickness can reach 3 millimeters, be applicable to multiple steel as: 20Cr, 12CrNi3A, 5CrMnMo, 5CrNiMo, 4CrMnSiMoV, 5Cr2NiMoVSi etc., have very much progress compared with conventional alloys material.

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 WC-Co-B-Ni coated material, is characterized in that: the mass percent of its component and each component is that WC accounts for 53.95%, Co accounts for 13%, B accounts for 16%, Ni accounts for 16%, trace element accounts for 1.05%;

Described trace element is Si, Cr, Mn and C.

2. a preparation method for hard WC-Co-B-Ni coated material, is characterized in that: comprise the following steps:

(1) aerosolization legal system is adopted to obtain the nanometer ball of WC-Co-B-Ni;

(2) mixing of promoting agent protection method Si, Cr, Mn and C is adopted to obtain nanometer powder.