High-temperature alloy surface treatment method

A high-temperature alloy and pretreatment technology, which is applied in the field of nuclear power, can solve the problems of inability to meet the performance indicators of the chromium nitride layer, loose layer, poor wear resistance, etc., to improve the overall performance and service life, not easy to fall off, low wear effect

Pending Publication Date: 2022-07-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, materials with high nickel content (about 37wt%) such as GH1059 and XH35BT find it difficult to infiltrate; the invention patent of Peng Xiao et al. (Patent No.: 200510047407.0) adopts the method of low-temperature chromizing, which is characterized in that the chromizing layer is modified by rare earth oxides , but the defect of this technology is that the prepared infiltrated layer is very loose, low in hardness and poor in wear resistance
Through the invention patent (patent number: 200810135237.5) of Wang Xiaorong and others, the chromizing and nitriding process experiment of austenitic stainless steel parts can not reach the performance index of the chromizing and nitriding layer of the superalloy

Method used

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Examples

Experimental program
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Embodiment 1

[0042] In this embodiment, the chromizing nitride layer is prepared on the substrate of GH1059, and the preparation method is as follows:

[0043] S1, pre-infiltration treatment

[0044] The substrate was placed in petroleum ether, cleaned with ultrasonic agitation for 15 minutes, removed the oil stain on the surface of the substrate, and then placed in acetone for ultrasonic cleaning for 15 minutes, followed by ultrasonic cleaning in absolute ethanol for 15 minutes, and finally taken out and dried with nitrogen.

[0045] S2, vacuum chromizing

[0046] The process of chromizing is divided into the following four steps:

[0047] S2.1. Bury the GH1059 substrate into a chromizing agent (50% chromium mass fraction, 38% alumina mass fraction, 10% iron mass fraction, NH 4 Cl and NH 4 I mass fraction 2%, NH 4 Cl and NH 4 The mass ratio of I is a container of 2:1), which is sealed into a vacuum pit furnace, and starts to heat up when the degree of vacuum reaches 20Pa or less. Th...

Embodiment 2

[0063] In the present embodiment, the specific steps of preparing the chromizing nitride layer on the XH35BT alloy substrate are as follows:

[0064] S1. Pretreatment of chromizing

[0065] Same as step 1) in Example 1

[0066] S2, the concrete steps of vacuum chromizing are:

[0067] S2.1, is basically the same as step (1) in Example 1, the difference is that the penetration agent (the mass fraction of chromium is 60%, the mass fraction of alumina is 24%, the mass fraction of iron is 15%, the mass fraction of NH 4 Cl and NH 4 I mass fraction 1%), the temperature was raised to 300°C at a rate of 80°C / h, and the temperature was maintained for 1 h.

[0068] S2.2. It is basically the same as step (2) in Example 1, except that the temperature rise rate is 50°C / h, the temperature is raised to 600°C, and the holding time is 3h.

[0069] S2.3. It is basically the same as step (3) in Example 1, the difference is: the heating rate is 30°C / h, the temperature is raised to 1120°C, and...

Embodiment 3

[0083] In the present embodiment, the specific steps for preparing the chromed nitride layer on the control rod moving conduit body made of GH1059 material are as follows:

[0084] S1. Pretreatment of chromizing

[0085] Same as 1) step in embodiment 1 and 2

[0086] S2, the concrete steps of vacuum chromizing are:

[0087] S2.1, the same as step (1) in Examples 1 and 2, the difference is that the penetration agent (the mass fraction of chromium is 60%, the mass fraction of alumina is 28%, the mass fraction of iron is 10%, the mass fraction of NH 4 Cl and NH 4 I mass fraction 2%), the temperature was raised to 300°C at a rate of 90°C / h, and the temperature was maintained for 1.5h.

[0088] S2.2, the same as step 1) in Example 2; the difference is that the holding time is 2.5h.

[0089] S2.3. The temperature is increased from 600°C to 1140°C at a rate of 40°C / h, and the temperature is maintained for 25 hours. During the heat preservation process, diffusion chromizing is per...

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Abstract

The invention discloses a high-temperature alloy surface treatment method, an adopted chromizing agent comprises the following components: 50-60% of chromium powder, 30-40% of alumina powder, 5-15% of iron powder and 1-2% of a mixture of ammonium chloride and ammonium iodide, and the method comprises the following steps: S1, pretreating a high-temperature alloy; s2, the high-temperature alloy is buried in a container containing a chromizing agent and placed in a vacuum pit furnace for chromizing treatment; s3, the surface of the high-temperature alloy subjected to chromium infiltration is subjected to cleaning and water removal treatment; and S4, the high-temperature alloy is put into a vacuum pit furnace to be subjected to nitriding treatment, so that the iron-nickel-based high-temperature alloy chromizing nitriding layer is prepared. The infiltrated layer prepared through the method is thick, is not prone to falling off under the high-load working condition, and has a good protection effect on a base body serving in the high-temperature, high-abrasion and severe environment.

Description

technical field [0001] The invention relates to the technical field of nuclear power, in particular to a surface treatment method of a superalloy. Background technique [0002] As one of the 6 advanced nuclear energy system reactor types of the fourth generation, the sodium-cooled fast reactor has extremely high safety and can improve the utilization rate of uranium and reduce nuclear waste. Gas) moving parts (including: nuts, guide cylinders, positioning keys, moving pipes, etc.) are high-temperature alloys independently developed in China and are key components of the control rod drive mechanism. The control rod drive mechanism is independent of the sodium-cooled fast reactor. Shutdown system actuators, these components have been in service in a liquid sodium environment of about 500 ℃ for a long time. However, the lower viscosity makes the lubricating performance of the liquid sodium medium very poor, and most of the friction pair components in the liquid sodium environm...

Claims

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Application Information

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IPC IPC(8): C23C12/00
CPCC23C12/00
Inventor 张学东蒲吉斌王立平何晓东温翔
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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