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Steel base surface alloying-ion nitriding wear-resistant corrosion-resistant composite modified layer and preparation method thereof

A technology of surface alloying and ion nitriding, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve slow nitriding speed, brittle peeling of nitriding layer, wear resistance and corrosion resistance Low-level problems, to achieve the effect of improving the hardness gradient, strengthening the strength support, and enhancing the ability to resist fatigue and wear

Active Publication Date: 2019-01-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at many problems existing in the prior art, the present invention provides a method for preparing a steel base surface alloying-ion nitriding wear-resistant and corrosion-resistant composite modified layer, which combines the alloying technology with the rare earth catalytic ion nitriding technology, A Cr-Ni-Ti-La alloying-ion nitriding wear-resistant and corrosion-resistant composite modified layer is prepared on the surface of the steel base, which solves the problem of slow nitriding speed, long production cycle and low efficiency of carbon steel in conventional nitriding treatment. The nitriding layer is shallow, the hardness gradient is large, and the brittleness is high, and the brittle spalling of the nitriding layer is easy to occur in the fatigue wear, and the wear resistance and corrosion resistance are lower than that of the matrix.

Method used

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  • Steel base surface alloying-ion nitriding wear-resistant corrosion-resistant composite modified layer and preparation method thereof
  • Steel base surface alloying-ion nitriding wear-resistant corrosion-resistant composite modified layer and preparation method thereof
  • Steel base surface alloying-ion nitriding wear-resistant corrosion-resistant composite modified layer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A method for preparing a steel base surface alloying-ion nitriding wear-resistant and corrosion-resistant composite modified layer, the alloy modified layer formula is as follows: calculated in parts by weight:

[0049] Cr 64.5 parts, Ni 32.3 parts, Ti 1.6 parts, La 1.6 parts;

[0050] The specific steps are as follows:

[0051] (1) Preparation of alloy target

[0052] Precisely weigh Cr, Ni, Ti and La metal powders with a purity of more than 99.9% according to the above formula, mix them, and pour them into a φ40mm mold after fully stirring, pressurize to 30MPa with a powder tablet press to form a diameter of φ40mm , a wafer sample with a thickness of 3 mm is put into a vacuum sintering furnace and sintered into a source target;

[0053] (2) Double-layer glow metal infiltration process

[0054] In the vacuum container of the ion nitriding equipment, the low and medium carbon steel workpieces are placed on the cathode seat, the source target is placed between the ano...

Embodiment 2

[0065] A method for preparing a steel base surface alloying-ion nitriding wear-resistant and corrosion-resistant composite modified layer, the alloy modified layer formula is as follows: calculated in parts by weight:

[0066] 64.7 parts of Cr, 32.5 parts of Ni, 1.6 parts of Ti, 1.2 parts of La;

[0067] The specific steps are as follows:

[0068] (1) Preparation of alloy target

[0069] Precisely weigh Cr, Ni, Ti and La metal powders with a purity of more than 99.9% according to the above formula, mix them, and pour them into a φ40mm mold after fully stirring, pressurize to 30MPa with a powder tablet press to form a diameter of φ40mm , a wafer sample with a thickness of 3 mm is put into a vacuum sintering furnace and sintered into a source target;

[0070] (2) Double-layer glow metal infiltration process

[0071] In the vacuum container of the ion nitriding equipment, place the low and medium carbon steel workpiece on the cathode seat, place the source target between the a...

Embodiment 3

[0082] A method for preparing a steel base surface alloying-ion nitriding wear-resistant and corrosion-resistant composite modified layer, the alloy modified layer formula is as follows: calculated in parts by weight:

[0083] 64.2 parts of Cr, 32.2 parts of Ni, 2.0 parts of Ti, 1.6 parts of La;

[0084] For the specific steps, refer to the parameters in Examples 1 and 2. The steel base surface alloying-ion nitriding wear-resistant and corrosion-resistant composite modified layer prepared in this example has the following effects:

[0085] 1. The hardness of the prepared alloy layer is about 3.5 times that of the matrix. Compared with Example 1, due to the increase of Ti content, excessive TiN phase is generated in the alloy layer, the hardness increases, and the brittleness increases;

[0086]2. After alloying, the ion nitriding speed and the thickness of the nitrided layer are about 4 times that of conventional ion nitriding. Compared with Example 1, due to the same rare e...

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Abstract

The invention relates to the field of metallic materials, and in particular relates to a steel base surface alloying-ion nitriding wear-resistant corrosion-resistant composite modified layer and a preparation method thereof. An alloying technique is combined with a rare-earth catalytic ion nitriding technology, and the Cr-Ni-Ti-La alloying-ion nitriding wear-resistant corrosion-resistant compositemodified layer is prepared on the steel base surface. The problems that carbon steel is low in nitriding speed, long in production cycle, low in efficiency, shallow in nitriding layer, large in hardness gradient and relatively high in brittleness in the conventional nitriding treatment, and the occurrence of brittle spalling of the nitriding layer in fatigue wear is easily caused, and the wear resistance and corrosion resistance are relatively low in improvement degree compared with that of a matrix can be solved.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a steel base surface alloying-ion nitriding wear-resistant and corrosion-resistant composite modified layer and a preparation method thereof. Background technique [0002] In industrial production, wear and corrosion are one of the main failure modes of steel structural parts. In order to improve the wear resistance and corrosion resistance of steel structural parts, surface nitriding treatment is a common method. However, the nitriding speed of conventional nitriding technology is slow, the nitriding layer is shallow, the hardness gradient is large, and the brittleness is high, and the brittle spalling of the nitriding layer is easy to occur in fatigue wear, and the wear resistance and corrosion resistance are lower than those of the matrix. It meets the working environment with higher requirements on wear resistance and corrosion resistance. [0003] At present, the conventiona...

Claims

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Application Information

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IPC IPC(8): C23C12/00
CPCC23C12/00
Inventor 蒋淑英黄万群许敬年张大磊许红明
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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