High-stability high-speed train brake disc coating and preparation method thereof

A high-speed train and high-stability technology, applied in coatings, metal material coating processes, mechanical equipment, etc., can solve problems such as thermal engine fatigue failure, brake disc wear, etc., to improve thermal fatigue resistance and ensure stability , Good resistance to high temperature oxidation and corrosion resistance

Active Publication Date: 2022-01-11
SHANDONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a high-stability high-speed train brake disc coating and its preparation method. By preparing a gradient composite coating, a matching and st...

Method used

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  • High-stability high-speed train brake disc coating and preparation method thereof
  • High-stability high-speed train brake disc coating and preparation method thereof
  • High-stability high-speed train brake disc coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] This embodiment selects 24CrNiMo cast steel high-speed brake discs, and adopts high-speed laser cladding technology to prepare composite coatings on its surface, such as figure 1 and figure 2 As shown, it specifically includes the following steps:

[0035](1) Carry out sandblasting roughening treatment to the brake disc, then remove the grease on the surface of the brake disc, and clean and dry;

[0036] (2) Use heat sealant to seal the connecting hole on the brake disc;

[0037] (3) Preparation of Inconel 625 alloy powder, Fe 10 co 10 Ni 10 Cr 4 Mo 6 B 5 Si 5 Alloy powder, dried at 150°C for 2 hours; and mixed powder of Inconel 625 and WC was prepared according to the proportion, wherein Inconel 625 accounted for 90wt%, WC accounted for 10wt%, and then the mixed powder of Inconel 625 and WC was placed in a mixer and mixed for 3 hours , to ensure that Inconel 625 powder and WC powder are evenly mixed and dried at 150°C for 2 hours; the above-mentioned Inconel ...

Embodiment 2

[0054] The difference between this embodiment 2 and embodiment 1 is that in this embodiment Fe 10 co 10 Ni 10 Cr 4 Mo 6 B 5 Si 5 The alloy powder is made by mixing elemental Fe, Co, Ni, Cr, Mo, Si, and B powders. Specifically, the elemental powder is weighed according to the atomic ratio, placed in a vacuum ball mill, and ball milled for 5 hours to obtain it.

[0055] Prepare a composite coating on the surface of the brake disc according to the laser cladding process parameters in Example 1. After grinding, the overall coating thickness is 3mm, the roughness Ra is 1.6, and the hardness of the outermost layer of the composite coating obtained is about 600HV. The friction coefficient of the composite coating is about 0.4 to 0.45, and the fluctuation of the friction coefficient is small during the friction test, and the fourth coating Fe 10 co 10 Ni 10 Cr 4 Mo 6 B 5 Si 5 The coating is detected by XRD and is FCC+BCC dual-phase structure.

Embodiment 3

[0057] The difference between this embodiment 3 and embodiment 1 is that the laser cladding process parameters are different. The specific process parameters of laser cladding in this embodiment are: laser power is 2kW, spot diameter is 3mm, powder feeding amount is 35g / min, lap joint The rate is 0.4, and the protective gas flow rate is 15L / min. Specifically, the scanning speed and cladding thickness of each coating are:

[0058] (a) The first layer is Inconel 625 alloy coating, that is, the basic coating, the cladding path is from the outer circle to the center of the circle, the scanning speed is 12mm / s, and the cladding thickness is 0.7mm;

[0059] (b) The second layer is Inconel 625+10% WC alloy coating, namely transition coating, the cladding path is from the center of the circle to the outer circle, the scanning speed is 8mm / s, and the cladding thickness is 0.9mm;

[0060] (c) The third layer is Fe 10 co 10 Ni 10 Cr 4 Mo 6 B 5 Si 5 Alloy coating, that is, wear-re...

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Abstract

The invention discloses a high-stability high-speed train brake disc coating and a preparation method thereof. A high-speed laser cladding process is adopted to sequentially clad a base coating, a transition coating and two wear-resistant coatings on the surface of a brake disc from the bottom layer to the surface layer; the base coating is an Inconel 625 alloy coating, the transition coating is an Inconel 625 and WC alloy coating, and the wear-resistant coatings are Fe10Co10Ni10Cr4Mo6B5Si5 alloy coatings. The four layers of composite coatings are in gradient change, so that the expansion coefficient and thermal conductivity difference caused by component change is reduced; the hardness of the four coatings is increased in a gradient mode, the hardness of the wear-resistant coatings can reach 600 HV, the wear resistance is improved, and the wear-resistant coatings are of an FCC + BCC double-phase structure and have obdurability; and the friction coefficient of the composite coating ranges from 0.4 to 0.45, the composite coating meets the high-speed brake disc friction coefficient standard, can be completely matched with an abrasive disc and has application universality, the friction coefficient is kept constant in the braking process, braking stability is guaranteed, and train operation safety is improved.

Description

technical field [0001] The invention relates to the technical field of coating preparation, in particular to a high-stability high-speed train brake disc coating and a preparation method. Background technique [0002] The brake disc of high-speed train is a high-energy braking device. It is one of the important braking components to ensure the safety and reliability of train operation under complex working conditions such as strong friction, high thermal load, large braking force and centrifugal force. During the long-term operation of the brake disc, the brake disc will fail due to friction wear and thermal fatigue; no matter the brake disc wear or thermal fatigue, it will only appear on the surface layer and the inner surface layer of the friction surface of the brake disc. Therefore, improving the friction and wear and thermal fatigue resistance of the surface of the brake disc can prolong its service life and improve economy, safety and reliability. Coating technology i...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C30/00F16D69/02
CPCC23C24/103C23C24/106C22C30/00C22C19/07F16D69/027
Inventor 张国松刘涛王文超殷强浩侯怀志玄纪元
Owner SHANDONG UNIV OF SCI & TECH
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