A kind of reinforced pellet and preparation method thereof

Abstract

The invention provides a strengthened pellet and a preparation method thereof, relates to a technique for strengthening the pellet through surface coating, and in particular relates to a product and a method for coating the surface of the pellet by using jump sputtering equipment. The invention can solve the contradiction between the hardness and the impact resistance of the pellets by plating a very thin hard alloy film on the surface of the cast iron shot and the steel shot with better toughness and impact resistance.

Description

technical field

[0001] The invention relates to a technology for strengthening pellets through surface coating, in particular to a product and method for coating the surface of pellets with jump sputtering equipment. Background technique

[0002] With the continuous development of mechanical fields such as aerospace, people have higher and higher requirements for the surface strength of parts. For example, the surface strength of parts such as aircraft skins and engine blades still cannot meet the use requirements after processing. The shot peening process is a cold working process that improves the fatigue strength of the workpiece by implanting residual compressive stress on the surface of the part. Because shot peening has the advantages of simple equipment, low cost, no restrictions on the shape and position of the workpiece, and convenient operation, it has been widely used in aerospace and other fields.

[0003] Due to the high strength and hardness of some workpiece...

Examples

Embodiment 1

[0037] The powder particles used in this embodiment are spherical cast iron pellets with a particle diameter of 3 mm, and the target material is tungsten carbide alloy.

[0038] The specific process is:

[0039] (1) Powder placement and target installation

[0040] Place the cast iron pellets to be sputtered on the sample stage, and place a baffle on the sample stage. Install the tungsten carbide target on the target position, and close the vacuum chamber door.

[0041] (2) vacuuming

[0042] Turn on the mechanical pump to evacuate the vacuum chamber to below 5Pa, turn on the molecular pump in the vacuum pumping device, and evacuate the vacuum chamber to 2.0×10 -3 Pa.

[0043] (3) Pre-sputtering target

[0044]Pour argon gas into the vacuum chamber until the air pressure in the vacuum chamber is maintained at 0.5Pa, turn on the target power, control the sputtering voltage to about 300V, the sputtering current to about 0.8A, and pre-sputter the target for 15 minutes.

[0...

Embodiment 2

[0053] The powder particles used in this embodiment are spherical cast steel shots with a particle diameter of about 1 mm, and the target material is titanium nitride alloy.

[0054] The specific process is:

[0055] (1) Powder placement and target installation

[0056] Place the cast iron pellets to be sputtered on the sample stage, and place a baffle on the sample stage. Install the tungsten carbide target on the target position, and close the vacuum chamber door.

[0057] (2) vacuuming

[0058] Turn on the mechanical pump to evacuate the vacuum chamber to 3Pa, turn on the molecular pump in the vacuum pumping device, and evacuate the vacuum chamber to 2.0×10 -3 Pa.

[0059] (3) Pre-sputtering target

[0060] Pour argon gas into the vacuum chamber until the air pressure in the vacuum chamber is maintained at 0.5 Pa, turn on the target power, control the sputtering voltage to about 350V, and the sputtering current to about 0.7A, and pre-sputter the target for 15 minutes. ...

Embodiment 3

[0070] The powder particles used in this embodiment are spherical cast steel shots with a particle diameter of about 1.5 mm, and the target materials are tantalum carbide and titanium nitride alloys. Two layers of films were plated respectively, both of which were 300nm thick.

[0071] The hardness of the shot increased from HV565 before coating to HV1220.

technical field

[0001] The invention relates to a technology for strengthening pellets through surface coating, in particular to a product and method for coating the surface of pellets with jump sputtering equipment. Background technique

[0002] With the continuous development of mechanical fields such as aerospace, people have higher and higher requirements for the surface strength of parts. For example, the surface strength of parts such as aircraft skins and engine blades still cannot meet the use requirements after processing. The shot peening process is a cold working process that improves the fatigue strength of the workpiece by implanting residual compressive stress on the surface of the part. Because shot peening has the advantages of simple equipment, low cost, no restrictions on the shape and position of the workpiece, and convenient operation, it has been widely used in aerospace and other fields.

[0003] Due to the high strength and hardness of some workpiece...

Examples

Embodiment 1

[0037] The powder particles used in this embodiment are spherical cast iron pellets with a particle diameter of 3 mm, and the target material is tungsten carbide alloy.

[0038] The specific process is:

[0039] (1) Powder placement and target installation

[0040] Place the cast iron pellets to be sputtered on the sample stage, and place a baffle on the sample stage. Install the tungsten carbide target on the target position, and close the vacuum chamber door.

[0041] (2) vacuuming

[0042] Turn on the mechanical pump to evacuate the vacuum chamber to below 5Pa, turn on the molecular pump in the vacuum pumping device, and evacuate the vacuum chamber to 2.0×10 -3 Pa.

[0043] (3) Pre-sputtering target

[0044]Pour argon gas into the vacuum chamber until the air pressure in the vacuum chamber is maintained at 0.5Pa, turn on the target power, control the sputtering voltage to about 300V, the sputtering current to about 0.8A, and pre-sputter the target for 15 minutes.

[0...

Embodiment 2

[0053] The powder particles used in this embodiment are spherical cast steel shots with a particle diameter of about 1 mm, and the target material is titanium nitride alloy.

[0054] The specific process is:

[0055] (1) Powder placement and target installation

[0056] Place the cast iron pellets to be sputtered on the sample stage, and place a baffle on the sample stage. Install the tungsten carbide target on the target position, and close the vacuum chamber door.

[0057] (2) vacuuming

[0058] Turn on the mechanical pump to evacuate the vacuum chamber to 3Pa, turn on the molecular pump in the vacuum pumping device, and evacuate the vacuum chamber to 2.0×10 -3 Pa.

[0059] (3) Pre-sputtering target

[0060] Pour argon gas into the vacuum chamber until the air pressure in the vacuum chamber is maintained at 0.5 Pa, turn on the target power, control the sputtering voltage to about 350V, and the sputtering current to about 0.7A, and pre-sputter the target for 15 minutes. ...

Embodiment 3

[0070] The powder particles used in this embodiment are spherical cast steel shots with a particle diameter of about 1.5 mm, and the target materials are tantalum carbide and titanium nitride alloys. Two layers of films were plated respectively, both of which were 300nm thick.

[0071] The hardness of the shot increased from HV565 before coating to HV1220.

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