Preparation method of high-frequency induction assistant self-propagating NiAl intermetallic compound coating

Abstract

The invention discloses a preparation method of a high-frequency induction assistant self-propagating NiAl intermetallic compound coating, and relates to the field of material surface engineering. Thepreparation method is characterized by comprising the following steps that 1, nickel powders and aluminum powders are pressed in proportion to make a preform; 2, the surface of a base body is polished by using abrasive paper; and 3, a high-frequency induction assistant self-propagating method is used for preheating the base body and a coating, and a self-propagating reaction is ignited to obtainthe NiAl intermetallic compound coating. The preparation method is simple in process, high in heating efficiency and low in cost, and the obtained coating is smooth, dense, low in porosity and high inbonding strength. The preparation method can be widely applied to surface treatment and remanufacturing of tools, dies, structural parts and the like so as to prolong the service life of the tools, dies, structural parts and the like.

Description

technical field

[0001] The invention relates to the field of material surface engineering, in particular to a method for preparing a self-propagating NiAl intermetallic compound coating assisted by high-frequency induction. Background technique

[0002] NiAl-based intermetallic compounds have high melting point, high hardness, light specific gravity, high thermal conductivity, high oxidation resistance and high temperature stability, and good resistance to cold and heat fatigue. NiAl-based intermetallic compounds are expected to replace the existing nickel-based and iron-based superalloys and be used in higher temperatures and harsher environments. In order to improve the high-temperature performance of steel, it is often coated with a layer of NiAl-based metal compound coating on its surface. In the surface engineering technology for preparing NiAl-based metal compound coatings, self-propagating high-temperature synthesis (SHS) technology is a fast, simple, economical and ...

Examples

Embodiment 1

[0032] A preparation method for high-frequency induction-assisted self-propagating NiAl intermetallic compound coating, which comprises the following steps:

[0033] (1) Mix Ni powder and Al powder according to the ratio of Ni / Al atomic ratio of 1:1 and pour them into a beaker and stir evenly, then pour acetone, put the beaker in an ultrasonic cleaning machine and continue stirring, the water temperature is constant at 50°C , until the acetone volatilizes until it becomes difficult to stir, then put the beaker into a vacuum drying oven at a temperature of 85°C, and dry it in vacuum for 12 hours; then spread a certain amount of Ni powder on the bottom of the steel mold, and then ball mill the mixture Put the material into a mold, press it into a powder block with a density of 76%, and then place the pressed powder block in a vacuum drying box for standby.

[0034](2) Polish the surface of the 5CrNiMo steel plate with sandpaper to remove rust and other attachments, clean it with...

Embodiment 2

[0042] A preparation method for high-frequency induction-assisted self-propagating NiAl intermetallic compound coating, which comprises the following steps:

[0043] (1) Mix Ni powder and Al powder according to the ratio of Ni / Al atomic ratio of 1:1 and pour them into a beaker and stir evenly, then pour acetone, put the beaker in an ultrasonic cleaning machine and continue stirring, the water temperature is constant at 45°C , until the acetone volatilizes until it is difficult to stir, then put the beaker into a vacuum drying oven at a temperature of 95°C, and dry it under vacuum for 11 hours; then spread a certain amount of Co powder on the bottom of the steel mold, and then ball mill the mixture Put the material into a mold, press it into a powder block with a density of 80%, and then place the pressed powder block in a vacuum drying box for standby.

[0044] (2) Grind the surface of the H13 steel plate with sandpaper to remove rust and other attachments, clean it with absol...

Embodiment 3

[0050] A preparation method of high frequency induction assisted self-propagating NiAl coating, it comprises the steps:

[0051] (1) Mix Ni powder and Al powder according to the ratio of Ni / Al atomic ratio of 1:1, pour into a beaker and stir evenly, then pour acetone, put the beaker in an ultrasonic cleaning machine and continue stirring, the water temperature is constant at 55°C , until the acetone volatilizes until it is difficult to stir, then put the beaker into a vacuum drying oven at a temperature of 70°C, and dry it under vacuum for 15 hours; then spread a certain amount of Fe powder on the bottom of the steel mold, and then ball mill the mixture Put the material into a mold, press it into a powder block with a density of 70%, and then place the pressed powder block in a vacuum drying box for standby.

[0052] (2) Polish the surface of No. 45 steel plate with sandpaper to remove rust and other attachments, clean it with absolute ethanol, and put it in a sealed box for l...

technical field

[0001] The invention relates to the field of material surface engineering, in particular to a method for preparing a self-propagating NiAl intermetallic compound coating assisted by high-frequency induction. Background technique

[0002] NiAl-based intermetallic compounds have high melting point, high hardness, light specific gravity, high thermal conductivity, high oxidation resistance and high temperature stability, and good resistance to cold and heat fatigue. NiAl-based intermetallic compounds are expected to replace the existing nickel-based and iron-based superalloys and be used in higher temperatures and harsher environments. In order to improve the high-temperature performance of steel, it is often coated with a layer of NiAl-based metal compound coating on its surface. In the surface engineering technology for preparing NiAl-based metal compound coatings, self-propagating high-temperature synthesis (SHS) technology is a fast, simple, economical and ...

Examples

Embodiment 1

[0032] A preparation method for high-frequency induction-assisted self-propagating NiAl intermetallic compound coating, which comprises the following steps:

[0033] (1) Mix Ni powder and Al powder according to the ratio of Ni / Al atomic ratio of 1:1 and pour them into a beaker and stir evenly, then pour acetone, put the beaker in an ultrasonic cleaning machine and continue stirring, the water temperature is constant at 50°C , until the acetone volatilizes until it becomes difficult to stir, then put the beaker into a vacuum drying oven at a temperature of 85°C, and dry it in vacuum for 12 hours; then spread a certain amount of Ni powder on the bottom of the steel mold, and then ball mill the mixture Put the material into a mold, press it into a powder block with a density of 76%, and then place the pressed powder block in a vacuum drying box for standby.

[0034](2) Polish the surface of the 5CrNiMo steel plate with sandpaper to remove rust and other attachments, clean it with...

Embodiment 2

[0042] A preparation method for high-frequency induction-assisted self-propagating NiAl intermetallic compound coating, which comprises the following steps:

[0043] (1) Mix Ni powder and Al powder according to the ratio of Ni / Al atomic ratio of 1:1 and pour them into a beaker and stir evenly, then pour acetone, put the beaker in an ultrasonic cleaning machine and continue stirring, the water temperature is constant at 45°C , until the acetone volatilizes until it is difficult to stir, then put the beaker into a vacuum drying oven at a temperature of 95°C, and dry it under vacuum for 11 hours; then spread a certain amount of Co powder on the bottom of the steel mold, and then ball mill the mixture Put the material into a mold, press it into a powder block with a density of 80%, and then place the pressed powder block in a vacuum drying box for standby.

[0044] (2) Grind the surface of the H13 steel plate with sandpaper to remove rust and other attachments, clean it with absol...

Embodiment 3

[0050] A preparation method of high frequency induction assisted self-propagating NiAl coating, it comprises the steps:

[0051] (1) Mix Ni powder and Al powder according to the ratio of Ni / Al atomic ratio of 1:1, pour into a beaker and stir evenly, then pour acetone, put the beaker in an ultrasonic cleaning machine and continue stirring, the water temperature is constant at 55°C , until the acetone volatilizes until it is difficult to stir, then put the beaker into a vacuum drying oven at a temperature of 70°C, and dry it under vacuum for 15 hours; then spread a certain amount of Fe powder on the bottom of the steel mold, and then ball mill the mixture Put the material into a mold, press it into a powder block with a density of 70%, and then place the pressed powder block in a vacuum drying box for standby.

[0052] (2) Polish the surface of No. 45 steel plate with sandpaper to remove rust and other attachments, clean it with absolute ethanol, and put it in a sealed box for l...

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