Method for improving hardness of zirconium and alloy thereof

Abstract

The invention discloses a method for improving hardness of zirconium and alloy thereof. The method comprises the following steps: 1, equipment and experimental materials are cleaned; 2, a workpiece and a source electrode are assembled, the distance between the source electrode and the workpiece is adjusted, a support, a heat preservation cover and the like are kept stable, and a furnace body is closed; and 3, after vacuumizing is carried out to about 1 Pa, Ar gas is inflated to 30-50 Pa, the negative bias voltage of 400-500 V is arranged on the cathode, the negative bias voltage of 800-1000 V is arranged on the to-be-cementation metal electrode (called the source electrode), under the action of the bias voltages, the gas is ignited, strong glow discharge is generated, and an unequal potential hollow cathode effect is generated between the cathode and the source electrode, so that the workpiece is rapidly heated to the high temperature, metal atoms to be infiltrated are sputtered out and deposited on the surface of the workpiece, the atoms are diffused and enter the surface layer of the workpiece to form a surface alloy layer at a high temperature under the action of the concentration gradient of the atoms deposited on the surface of the workpiece, and for a zirconium matrix, when the temperature reaches about 1000 DEG C, the partial area of the zirconium matrix has a melting sign.

Description

technical field

[0001] The invention relates to the technical field of methods for improving the hardness of alloys, in particular to a method for improving the hardness of zirconium and its alloys. Background technique

[0002] Zirconium and zirconium alloys have extremely high melting point, good corrosion resistance, excellent radiation resistance and good machining performance, so they have important applications in the field of atomic energy and petrochemical industry. Zirconium has a low atomic thermal neutron absorption cross section and has good compatibility with nuclear fuel. High-performance nuclear-grade zirconium alloys have moderate mechanical properties and good corrosion resistance in high-temperature and high-pressure water and steam, so they are used as core structural materials for water-cooled nuclear reactors, such as fuel cladding, pressure tubes, brackets and tunnel tubes. The nuclear zirconium-based alloys produced on an industrial scale mainly inclu...

Examples

Embodiment 1

[0043] A method for improving the hardness of zirconium and its alloys, comprising the steps of:

[0044] Step 1: Clean equipment and experimental materials;

[0045] Step 2: Assemble the workpiece and the source, adjust the distance between the source and the workpiece, keep the bracket, insulation cover, etc. stable, and close the furnace body;

[0046] Step 3: After evacuating to about 1Pa, fill Ar gas to 30-50Pa, set the negative bias voltage of 400-500V on the cathode, and set the negative bias voltage of 800-1000V on the metal electrode to be infiltrated. Under the action of the bias voltage, the gas is ignited, A strong glow discharge is generated, and an unequal potential hollow cathode effect is generated between the cathode and the source, so that the workpiece is rapidly heated to a high temperature, so that the metal atoms to be infiltrated are sputtered out and deposited on the surface of the workpiece. Under the action of the atomic concentration gradient deposi...

Embodiment 2

[0058] A method for improving the hardness of zirconium and its alloys, comprising the steps of:

[0059] Step 1: Clean equipment and experimental materials;

[0060] Step 2: Assemble the workpiece and the source, adjust the distance between the source and the workpiece, keep the bracket, insulation cover, etc. stable, and close the furnace body;

[0061] Step 3: After evacuating to about 1Pa, fill Ar gas to 30-50Pa, set the negative bias voltage of 400-500V on the cathode, and set the negative bias voltage of 800-1000V on the metal electrode to be infiltrated. Under the action of the bias voltage, the gas is ignited, A strong glow discharge is generated, and an unequal potential hollow cathode effect is generated between the cathode and the source, so that the workpiece is rapidly heated to a high temperature, so that the metal atoms to be infiltrated are sputtered out and deposited on the surface of the workpiece. Under the action of the atomic concentration gradient deposi...

Embodiment 3

[0072] A method for improving the hardness of zirconium and its alloys, comprising the steps of:

[0073] Step 1: Clean equipment and experimental materials;

[0074] Step 2: Assemble the workpiece and the source, adjust the distance between the source and the workpiece, keep the bracket, insulation cover, etc. stable, and close the furnace body;

[0075] Step 3: After evacuating to about 1Pa, fill Ar gas to 30-50Pa, set the negative bias voltage of 400-500V on the cathode, and set the negative bias voltage of 800-1000V on the metal electrode to be infiltrated. Under the action of the bias voltage, the gas is ignited, A strong glow discharge is generated, and an unequal potential hollow cathode effect is generated between the cathode and the source, so that the workpiece is rapidly heated to a high temperature, so that the metal atoms to be infiltrated are sputtered out and deposited on the surface of the workpiece. Under the action of the atomic concentration gradient deposi...

technical field

[0001] The invention relates to the technical field of methods for improving the hardness of alloys, in particular to a method for improving the hardness of zirconium and its alloys. Background technique

[0002] Zirconium and zirconium alloys have extremely high melting point, good corrosion resistance, excellent radiation resistance and good machining performance, so they have important applications in the field of atomic energy and petrochemical industry. Zirconium has a low atomic thermal neutron absorption cross section and has good compatibility with nuclear fuel. High-performance nuclear-grade zirconium alloys have moderate mechanical properties and good corrosion resistance in high-temperature and high-pressure water and steam, so they are used as core structural materials for water-cooled nuclear reactors, such as fuel cladding, pressure tubes, brackets and tunnel tubes. The nuclear zirconium-based alloys produced on an industrial scale mainly inclu...

Examples

Embodiment 1

[0043] A method for improving the hardness of zirconium and its alloys, comprising the steps of:

[0044] Step 1: Clean equipment and experimental materials;

[0045] Step 2: Assemble the workpiece and the source, adjust the distance between the source and the workpiece, keep the bracket, insulation cover, etc. stable, and close the furnace body;

[0046] Step 3: After evacuating to about 1Pa, fill Ar gas to 30-50Pa, set the negative bias voltage of 400-500V on the cathode, and set the negative bias voltage of 800-1000V on the metal electrode to be infiltrated. Under the action of the bias voltage, the gas is ignited, A strong glow discharge is generated, and an unequal potential hollow cathode effect is generated between the cathode and the source, so that the workpiece is rapidly heated to a high temperature, so that the metal atoms to be infiltrated are sputtered out and deposited on the surface of the workpiece. Under the action of the atomic concentration gradient deposi...

Embodiment 2

[0058] A method for improving the hardness of zirconium and its alloys, comprising the steps of:

[0059] Step 1: Clean equipment and experimental materials;

[0060] Step 2: Assemble the workpiece and the source, adjust the distance between the source and the workpiece, keep the bracket, insulation cover, etc. stable, and close the furnace body;

[0061] Step 3: After evacuating to about 1Pa, fill Ar gas to 30-50Pa, set the negative bias voltage of 400-500V on the cathode, and set the negative bias voltage of 800-1000V on the metal electrode to be infiltrated. Under the action of the bias voltage, the gas is ignited, A strong glow discharge is generated, and an unequal potential hollow cathode effect is generated between the cathode and the source, so that the workpiece is rapidly heated to a high temperature, so that the metal atoms to be infiltrated are sputtered out and deposited on the surface of the workpiece. Under the action of the atomic concentration gradient deposi...

Embodiment 3

[0072] A method for improving the hardness of zirconium and its alloys, comprising the steps of:

[0073] Step 1: Clean equipment and experimental materials;

[0074] Step 2: Assemble the workpiece and the source, adjust the distance between the source and the workpiece, keep the bracket, insulation cover, etc. stable, and close the furnace body;

[0075] Step 3: After evacuating to about 1Pa, fill Ar gas to 30-50Pa, set the negative bias voltage of 400-500V on the cathode, and set the negative bias voltage of 800-1000V on the metal electrode to be infiltrated. Under the action of the bias voltage, the gas is ignited, A strong glow discharge is generated, and an unequal potential hollow cathode effect is generated between the cathode and the source, so that the workpiece is rapidly heated to a high temperature, so that the metal atoms to be infiltrated are sputtered out and deposited on the surface of the workpiece. Under the action of the atomic concentration gradient deposi...

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