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A Rare Earth Implantation Treatment Method for Improving Vacuum Carburizing Efficiency

A technology of vacuum carburizing and treatment method, which is applied in the field of surface treatment combined with ion implantation and vacuum carburizing, can solve the problems of coarse carbides in the carburizing layer, long carburizing cycle, uneven dispersion, etc., and achieves improved vacuum carburizing. Efficiency, uniform distribution, effect of reducing carburizing temperature

Active Publication Date: 2019-03-05
HARBIN ENG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a rare earth injection treatment method to improve the efficiency of vacuum carburizing, which can solve the problems of coarse carbide, uneven dispersion, long carburizing cycle, low efficiency and high temperature in the carburizing layer structure in vacuum carburizing

Method used

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  • A Rare Earth Implantation Treatment Method for Improving Vacuum Carburizing Efficiency
  • A Rare Earth Implantation Treatment Method for Improving Vacuum Carburizing Efficiency
  • A Rare Earth Implantation Treatment Method for Improving Vacuum Carburizing Efficiency

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specific Embodiment approach 1

[0029] Specific implementation mode 1: This implementation mode is carried out with reference to the conventional vacuum carburizing process. Grinding, polishing and cleaning the samples in sequence, the specific implementation steps are as follows:

[0030] 1. Use 60#, 240#, 600#, 800#, 1000#, 2000# sandpaper to polish the surface of the substrate sample smoothly, and clean it with absolute ethanol after polishing;

[0031] 2. Put the polished matrix test block obtained from the test into the ECM vacuum carburizing test furnace, close the furnace door, set the carburizing mode to gas pulse type, vacuum the paper in the furnace, and follow the carburizing gas-cooling gas-carburizing Carburize the sample in the order of carbon gas-cooling gas, and the carburizing medium is acetylene (C 2 h 2 ), the cooling gas is nitrogen (N 2 ), the carburizing temperature is 925°C, and the flow rate of acetylene is 1000-2000m 3 / h. The purity of the gas used for carburizing and diffusion...

specific Embodiment approach 2

[0033] Embodiment 2: The rare earth target used for ion implantation in this embodiment is a rare earth Ce target with a purity of 99%. 1.

[0034] The composite treatment method of rare earth Ce implantation combined with vacuum carburizing technology to improve carburizing rate is realized in the following steps:

[0035] 1. Use 60#, 240#, 600#, 800#, 1000#, 2000# sandpaper to polish the surface of the substrate sample block smoothly, and clean it with absolute ethanol after polishing;

[0036] 2. Use the MEVVA DC linear ion implanter to conduct the rare earth Ce ion implantation test. The specific parameters are: the control injection voltage is 40-60KV, and the injection metering is 2×10 17 ion / cm 2 , the implantation temperature is 25-100°C, and a Ce ion implantation layer is obtained on the surface of the alloy steel;

[0037]In the second step, after the test block is placed in the DC linear ion implantation system, the chamber needs to be evacuated, and the target s...

specific Embodiment approach 3

[0040] Specific implementation mode three: In this implementation mode, the samples that are polished, polished, and cleaned without any pretreatment process are subjected to low-temperature vacuum carburizing heat treatment. The specific implementation steps are as follows:

[0041] 1. Use 60#, 240#, 600#, 800#, 1000#, 2000# sandpaper to polish the surface of the substrate sample smoothly, and clean it with absolute ethanol after polishing;

[0042] 2. Put the polished matrix test block obtained from the test into the ECM vacuum carburizing test furnace, close the furnace door, set the carburizing mode to gas pulse type, pump the furnace to vacuum, and follow the carburizing gas-cooling gas-carburizing Carburize the sample in the order of carbon gas-cooling gas, and the carburizing medium is acetylene (C 2 h 2 ), the cooling gas is nitrogen (N 2 ), the carburizing temperature is 905°C, and the flow rate of acetylene is 1000-2000m 3 / h. The purity of the gas used for carbu...

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Abstract

The invention provides a rare earth injection treatment method for improving the vacuum carburizing efficiency. According to the rare earth injection treatment method for improving the vacuum carburizing efficiency, before vacuum carburizing, rare earth cerium ion injection treatment is conducted on a base material firstly, so that a cerium ion rare earth injection layer with the thickness being 50-70 nm is formed on the surface of the base material; and then vacuum carburizing heat treatment is conducted. Through lattice distortion generated by rare earth injection and the rare earth microalloying effect, the vacuum carburizing efficiency is improved, the carburizing temperature is decreased, and the quality of a carburized layer is improved. Compared with an existing preparation method for a rare earth mixed carburization catalyst, the adopted ion injection technique has the advantages that operation is easy, residues are avoided, and segmented control over the carbon potential in the carburizing process is not needed; the carburization catalyzing reaction can be completed in a vacuum carburizing furnace, carbides in the carburized layer are fine and are evenly distributed after carburization, the carburizing temperature can be decreased, and the carburizing speed can be increased.

Description

technical field [0001] The invention relates to a material surface treatment method, in particular to a surface treatment method combining ion implantation and vacuum carburizing. Background technique [0002] Because vacuum carburizing is carburizing heat treatment under vacuum conditions, it is easy to obtain a high-hardness martensitic structure without intergranular oxidation on the surface, and at the same time, the core has good toughness, and its wear resistance and fatigue resistance are better than traditional ones. Carburizing is an important means of strengthening automobile chassis, bearings, gears, piston pins and other parts. However, it still has the disadvantages of high carburizing temperature and long production cycle of carburizing process. Therefore, the use of rare earth infiltration technology to accelerate the heat treatment process, improve the quality of the carburizing layer, and reduce the carburizing temperature and energy consumption is a breakth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/48C23C14/16C23C8/22C23C28/00C21D1/18
CPCC21D1/18C23C8/22C23C14/16C23C14/48C23C28/322C23C28/341Y02P10/20
Inventor 金国董美伶崔秀芳岳彩文蔡召兵赵鑫
Owner HARBIN ENG UNIV
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