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Method for utilizing plasma spray scalded wear-resistant coating

A wear-resistant coating and plasma technology, applied in the field of metal material preparation, can solve the problems of affecting the protective effect of the matrix material, easy to fall off, plastic deformation, etc., achieve easy distribution and coating area, reduce the difference in alloy shrinkage ratio, The effect of improving binding force

Active Publication Date: 2015-07-22
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The wear-resistant coating mentioned above is easy to fall off when it is impacted and collided. In addition, it will produce different degrees of plastic deformation under the action of complex alternating stress, which will eventually lead to the peeling of the coating, which seriously affects the protection of the base material. effect

Method used

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  • Method for utilizing plasma spray scalded wear-resistant coating
  • Method for utilizing plasma spray scalded wear-resistant coating
  • Method for utilizing plasma spray scalded wear-resistant coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The first step: raw material preparation

[0033] Powder raw materials are Fe, Ti, W, B 4 C, C, WC powder, powder particle size: Fe, Ti, W powder particle size is 61-74μm, WC, B 4 The particle size of C powder is 44-53μm, and the proportion of raw materials according to mass percentages are: 50% Fe, 15% Ti, 10% W, 10% B 4 C, 5% C, 10% WC. Put the reaction raw materials into the mixer and ball mill for 4 hours, and take them out for later use.

[0034] Step 2: Pretreatment of the workpiece surface

[0035] The purpose of the surface pretreatment of the workpiece is mainly to improve the bonding strength between the coating and the substrate. It is divided into two steps: cleaning and sandblasting: first use acetone or gasoline to completely remove the oil on the surface of the workpiece, and then sandblast the surface, remove rust and remove Oxide skin makes the surface silvery gray.

[0036] Step 3: Preparation process of wear-resistant boss (coating)

[0037] Place the workpie...

Embodiment 2

[0041] In addition to step (1), the powder raw material ratio according to mass percentages are: 80% Fe, 10% Ti, 5% W, 2% B 4 C, 3% WC, C is zero, and the main technical parameters of plasma spraying in the preparation process of step (3) wear-resistant boss (coating) are set as: current 100A, voltage 30V, gas Ar+N 2 Total air volume 6L / min, N 2 The air volume is 10%, and the powder feeding volume: 50g / min. Except for the parameter changes in the above two steps, the other processes and parameters are the same as the first embodiment.

[0042] The height of the finally obtained wear-resistant boss is 5mm, the average diameter of the boss is about 10mm, the scaly hardened area formed by the boss accounts for 80% of the surface area of ​​the whole workpiece, and the surface hardness of the boss can reach HRC58-60.

Embodiment 3

[0044] In addition to step (1), the proportion of powder raw materials according to mass percentages are: 65% Fe, 12% Ti, 8% W, 6% B 4 In addition to C, 4% C, and 5% WC, the main technical parameters of plasma spraying in the preparation process of step (3) wear-resistant boss (coating) are set as follows: current 150A, voltage 40V, Ar+N 2 Total air volume: 4.5L / min, N 2 The air volume is 20%, and the powder feeding volume is 30 g / min. Except for the parameter changes in the above two steps, the other processes and parameters are the same as in the first embodiment.

[0045] The final height of the wear-resistant boss is 4mm, the average diameter of the boss is about 13mm, the scaly hardened area formed by the boss accounts for 65% of the total surface area of ​​the workpiece, and the surface hardness of the boss can reach HRC60-62.

[0046] From the coating structure of the present invention figure 1 It can be seen that there is a rapid melting transition zone between the cermet coa...

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Abstract

The invention discloses a method for utilizing a plasma spray scalded wear-resistant coating. The method for utilizing the plasma spray scalded wear-resistant coating is characterized in that Fe+B4C+Ti+W+C+WC are taken as raw materials, Ar and N2 are taken as gas media, in situ reaction is carried out on the surface of a pretreated workpiece under the heating action of a plasma beam heat source, and a wear-resistant boss coating in a scalded shape is formed, wherein height of a wear-resistant boss is 3-5mm, and diameter of the wear-resistant boss is 10-15mm. The method for utilizing the plasma spray scalded wear-resistant coating has the advantages that a rapid melting and solidification transition region is formed between a metal ceramic coating and a matrix, hardness of the rapid melting and solidification transition region is between the hardness of the metal ceramic coating and the hardness of the matrix, and a binding force of the metal ceramic coating and the matrix can be beneficially improved; a wear-resistant boss coating surface structural form distributed in the scalded shape is formed on the surface of a workpiece, the tendency that cracks appear in the coating due to different alloy contraction ratios can be reduced, and peeling of large-area coating can be greatly inhibited.

Description

Technical field [0001] The invention relates to the field of metal material preparation, in particular to the preparation method of wear-resistant coatings. Specifically, it is transported on the surface of a substrate (such as unloading mill chain plates, hopper lining plates, grab blade plates, automatic dump truck dump plates, and mining machinery). The surface of wear-resistant plates such as machine liners, baffles, etc.) obtain a scaly structure wear-resistant composite coating and a preparation method of the scaly structure. Background technique [0002] Nowadays, wear-resistant plates have been widely used in loading machinery, mining machinery, heavy-duty transportation and other industries, and their excellent wear-resistant properties have significantly improved the overall performance and service life of mechanical equipment. Greatly save the use cost and reduce the material consumption. The acquisition of wear-resistant coatings has become the top priority for the d...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/06C23C4/134
Inventor 崔洪芝王珂王灿明王淑峰夏鹏成宋晓杰张新杰程贵勤
Owner SHANDONG UNIV OF SCI & TECH
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