Preparation method of tungsten boride composite coating

Abstract

The invention discloses a preparation method of a tungsten boride composite coating, and relates to coating of boride on metal materials. The tungsten boride composite coating is synthesized through a thermal spraying in-situ reaction. The preparation method comprises the steps that tungsten oxide / boron carbide / aluminum composite powder used for thermal spraying is prepared; the base material surface needing the coating is pretreated; and the tungsten boride composite coating is prepared. The defects that the existing technology for preparing the tungsten boride composite coating is complex, high in cost, large in pollution and low in deposition efficiency, and the coating is small in thickness, low in compactness, poor in uniformity, low in toughness, poor in binding force with a base body, likely to be cracked and not suitable for being applied in large-scale industrial production are overcome.

Description

technical field

[0001] The technical proposal of the present invention relates to the plating of borides on metal materials, in particular to the preparation method of tungsten boride composite coating. Background technique

[0002] Transition metal borides have high melting point, high hardness and excellent chemical stability, and are widely used in hard tool materials and wear-resistant and corrosion-resistant parts in industry. Tungsten boride (WB 2 ) is a silver-white octahedral crystal structure with a very high melting point (2900 ° C), which has extremely high hardness (43GPa) and excellent friction and wear resistance, and is used as a wear-resistant material such as a knife or cutting tool; The chemical properties of tungsten are stable, so it is used as a corrosion-resistant material under harsh conditions or exposed to special environments; moreover, tungsten boride has excellent thermal conductivity and electrical conductivity, and is used to prepare high-tempe...

Examples

Embodiment 1

[0038] The first step is to prepare tungsten oxide / boron carbide / aluminum composite powder for thermal spraying:

[0039] Mix aluminum powder with a particle size range of 0.1 micron to 10 microns, tungsten oxide powder with a particle size range of 0.001 micron to 10 microns, and boron carbide powder with a particle size range of 0.001 micron to 10 microns to form a composite powder. Wherein, boron carbide powder accounts for 5% by weight of the total mass of the three raw material powders, aluminum powder plus tungsten oxide powder accounts for 95% by weight of the total mass of the three raw material powders, and the weight percentage between the tungsten oxide powder and the aluminum powder The weight ratio is 60:40, and then uniformly mixed into the binder polyvinyl alcohol, the amount of the binder polyvinyl alcohol is, the weight ratio is the above-mentioned composite powder: polyvinyl alcohol = 100:0.1, thus formulated for use in Thermally sprayed tungsten oxide / boron ...

Embodiment 2

[0045] The first step is to prepare tungsten oxide / boron carbide / aluminum composite powder for thermal spraying:

[0046] Mix aluminum powder with a particle size range of 0.1 micron to 10 microns, tungsten oxide powder with a particle size range of 0.001 micron to 10 microns, and boron carbide powder with a particle size range of 0.001 micron to 10 microns to form a composite powder. Wherein, boron carbide powder accounts for 10% by weight of the total mass of the three raw material powders, aluminum powder plus tungsten oxide powder accounts for 90% by weight of the total mass of the three raw material powders, and the weight percentage between the tungsten oxide powder and the aluminum powder The weight ratio is 85:15, and then uniformly mixed into the binder polyvinyl alcohol, the amount of the binder polyvinyl alcohol is, the weight ratio is the above-mentioned composite powder: polyvinyl alcohol=100:1, thus formulated for use in Thermally sprayed tungsten oxide / boron car...

Embodiment 3

[0053] The first step is to prepare tungsten oxide / boron carbide / aluminum composite powder for thermal spraying:

[0054] Mix aluminum powder with a particle size range of 0.1 micron to 10 microns, tungsten oxide powder with a particle size range of 0.001 micron to 10 microns, and boron carbide powder with a particle size range of 0.001 micron to 10 microns to form a composite powder. Wherein, boron carbide powder accounts for 30% by weight of the total mass of the three raw material powders, aluminum powder plus tungsten oxide powder accounts for 70% by weight of the total mass of the three raw material powders, and the weight percentage between tungsten oxide powder and aluminum powder The weight ratio is 90:10, and then uniformly mixed into the binder methylcellulose, the amount of the binder methylcellulose is, the weight ratio is the above composite powder: methylcellulose=100:2, thus preparing into tungsten oxide / boron carbide / aluminum composite powder for thermal sprayi...

technical field

[0001] The technical proposal of the present invention relates to the plating of borides on metal materials, in particular to the preparation method of tungsten boride composite coating. Background technique

[0002] Transition metal borides have high melting point, high hardness and excellent chemical stability, and are widely used in hard tool materials and wear-resistant and corrosion-resistant parts in industry. Tungsten boride (WB 2 ) is a silver-white octahedral crystal structure with a very high melting point (2900 ° C), which has extremely high hardness (43GPa) and excellent friction and wear resistance, and is used as a wear-resistant material such as a knife or cutting tool; The chemical properties of tungsten are stable, so it is used as a corrosion-resistant material under harsh conditions or exposed to special environments; moreover, tungsten boride has excellent thermal conductivity and electrical conductivity, and is used to prepare high-tempe...

Examples

Embodiment 1

[0038] The first step is to prepare tungsten oxide / boron carbide / aluminum composite powder for thermal spraying:

[0039] Mix aluminum powder with a particle size range of 0.1 micron to 10 microns, tungsten oxide powder with a particle size range of 0.001 micron to 10 microns, and boron carbide powder with a particle size range of 0.001 micron to 10 microns to form a composite powder. Wherein, boron carbide powder accounts for 5% by weight of the total mass of the three raw material powders, aluminum powder plus tungsten oxide powder accounts for 95% by weight of the total mass of the three raw material powders, and the weight percentage between the tungsten oxide powder and the aluminum powder The weight ratio is 60:40, and then uniformly mixed into the binder polyvinyl alcohol, the amount of the binder polyvinyl alcohol is, the weight ratio is the above-mentioned composite powder: polyvinyl alcohol = 100:0.1, thus formulated for use in Thermally sprayed tungsten oxide / boron ...

Embodiment 2

[0045] The first step is to prepare tungsten oxide / boron carbide / aluminum composite powder for thermal spraying:

[0046] Mix aluminum powder with a particle size range of 0.1 micron to 10 microns, tungsten oxide powder with a particle size range of 0.001 micron to 10 microns, and boron carbide powder with a particle size range of 0.001 micron to 10 microns to form a composite powder. Wherein, boron carbide powder accounts for 10% by weight of the total mass of the three raw material powders, aluminum powder plus tungsten oxide powder accounts for 90% by weight of the total mass of the three raw material powders, and the weight percentage between the tungsten oxide powder and the aluminum powder The weight ratio is 85:15, and then uniformly mixed into the binder polyvinyl alcohol, the amount of the binder polyvinyl alcohol is, the weight ratio is the above-mentioned composite powder: polyvinyl alcohol=100:1, thus formulated for use in Thermally sprayed tungsten oxide / boron car...

Embodiment 3

[0053] The first step is to prepare tungsten oxide / boron carbide / aluminum composite powder for thermal spraying:

[0054] Mix aluminum powder with a particle size range of 0.1 micron to 10 microns, tungsten oxide powder with a particle size range of 0.001 micron to 10 microns, and boron carbide powder with a particle size range of 0.001 micron to 10 microns to form a composite powder. Wherein, boron carbide powder accounts for 30% by weight of the total mass of the three raw material powders, aluminum powder plus tungsten oxide powder accounts for 70% by weight of the total mass of the three raw material powders, and the weight percentage between tungsten oxide powder and aluminum powder The weight ratio is 90:10, and then uniformly mixed into the binder methylcellulose, the amount of the binder methylcellulose is, the weight ratio is the above composite powder: methylcellulose=100:2, thus preparing into tungsten oxide / boron carbide / aluminum composite powder for thermal sprayi...

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