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Preparation method for wear-resisting and anti-friction coating on vermicular graphite cast iron surface of cylinder head

A technology of vermicular graphite cast iron and anti-friction coating, which is applied in the coating, metal material coating process, etc., and can solve the problem of easy generation of hardened layer, increased crack tendency, and influence on the wear resistance and anti-friction performance of the cladding layer, etc. problems, to achieve the effect of controlling cracks, reducing residual stress, and eliminating residual stress

Inactive Publication Date: 2019-03-22
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large carbon content of vermicular graphite cast iron, under the characteristics of rapid cooling and rapid heating of laser cladding, it is easy to produce a hardened layer, resulting in a larger tendency of cracks, which affects the wear resistance and friction reduction performance of the cladding layer.

Method used

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  • Preparation method for wear-resisting and anti-friction coating on vermicular graphite cast iron surface of cylinder head
  • Preparation method for wear-resisting and anti-friction coating on vermicular graphite cast iron surface of cylinder head
  • Preparation method for wear-resisting and anti-friction coating on vermicular graphite cast iron surface of cylinder head

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (a) Derusting, degreasing and drying the surface of cylinder head vermicular graphite cast iron RuT300 (see Table 1 for chemical composition);

[0037] (b) Carrying out heat treatment in advance to the vermicular graphite cast iron after step (a), the preheating temperature is 200 DEG C;

[0038] (c) Co-based alloy, Cr 3 C 2 and MoS 2 The three powders are mechanically mixed and then dried, among which Cr 3 C 2 The mass percentage of powder is 10%, MoS 2 The mass percentage of the powder is 6%, and the rest is Co-based alloy powder Tribaloy800;

[0039] (d) using laser cladding technology, depositing the powder dried in step (c) on the surface of the preheated vermicular graphite cast iron in step (b), to obtain a wear-resistant and anti-friction coating with good bonding state and no cracks, By optimizing the process parameters, the coating thickness is controlled at about 1.2mm, the laser beam spot is a circular spot with a diameter of 3.5mm, the power is 2.0kW,...

Embodiment 2

[0049] (a) Derusting, degreasing and drying the surface of vermicular graphite cast iron RuT300 of the cylinder head;

[0050] (b) Carrying out heat treatment in advance to the compacted graphite cast iron after step (a), the preheating temperature is 250 DEG C;

[0051] (c) Co-based alloy, Cr 3 C 2 and MoS 2 The three powders are mechanically mixed and then dried, among which Cr 3 C 2 The mass percentage of powder is 12%, MoS 2 The mass percentage of the powder is 5%, and the rest is Co-based alloy powder Tribaloy400;

[0052] (d) using laser cladding technology, depositing the powder dried in step (c) on the surface of the preheated vermicular graphite cast iron in step (b), to obtain a wear-resistant and anti-friction coating with good bonding state and no cracks, By optimizing the process parameters, the coating thickness is controlled at about 1.3mm, the laser beam spot is a circular spot with a diameter of 5mm, the power is 2.2kW, the speed is 10mm / s, the powder fe...

Embodiment 3

[0056] (a) Derusting, degreasing and drying the surface of vermicular graphite cast iron RuT300 of the cylinder head;

[0057] (b) Carrying out heat treatment in advance to the vermicular graphite cast iron after step (a), the preheating temperature is 300 DEG C;

[0058] (c) Co-based alloy, Cr 3 C 2 and MoS 2 The three powders are mechanically mixed and then dried. Among them, Cr 3 C 2 The mass percentage of powder is 15%, MoS 2 The mass percentage of the powder is 4%, and the rest is Co-based alloy powder Stellite156;

[0059] (d) using laser cladding technology, depositing the powder dried in step (c) on the surface of the preheated vermicular graphite cast iron in step (b), to obtain a wear-resistant and anti-friction coating with good bonding state and no cracks; By optimizing the process parameters, the coating thickness is controlled at about 1.5mm, the light spot is a rectangular spot of 12mm×2mm, the power is 2.4kW, the speed is 12mm / s, the powder feeding amoun...

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Abstract

The invention discloses a preparation method for a wear-resisting and anti-friction coating on a vermicular graphite cast iron surface of a cylinder head. The preparation method for the wear-resistingand anti-friction coating on the vermicular graphite cast iron surface comprises the following steps that firstly, vermicular graphite cast iron after surface treatment is subjected to moderate pre-heat treatment; then a Co-based alloy, Cr3C2 and MoS2 powder are mixed evenly and dried according to the proportion; the laser cladding technology is used to deposit the dried powder on the vermiculargraphite cast iron surface in the form of multi-channel overlap to form a Co-based composite coating; and finally, the Co-based composite coating is subjected to subsequent heat treatment to obtain awear-resisting and anti-friction cladding layer. The advantages are that the probability of peeling, separating and exfoliating can be greatly reduced by good metallurgical bonding, the damage to a matrix material is small, and the matrix deformation and strength loss are smaller; a vermicular graphite cast iron matrix is subjected to pre-heat treatment so that the thermal stress can be effectively reduced, and thus the crack initiation is controlled; the wear-resisting and anti-friction coating prepared is subjected to subsequent heat treatment, so that residual stress after laser cladding isreduced and eliminated, and cracks in the using process of the coating are avoided; the coating prepared has excellent performance, both wear-resisting and anti-friction performance; and the claddingefficiency is high.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, in particular to a method for preparing a wear-resistant and anti-friction coating on the surface of vermicular graphite cast iron of a cylinder head. Background technique [0002] Vermicular graphite cast iron is a gray cast iron with a transitional shape between flake and spheroidal graphite. Because of its excellent thermal conductivity and casting performance, good plasticity and fatigue resistance, it has become the material of choice for the cylinder head of key parts of the engine. However, the vermicular graphite cast iron of the cylinder head usually suffers from multiple forms of cross wear under large kinetic friction, such as abrasive wear, corrosion wear, etc., so it is difficult to meet the requirements of wear-resistant and friction-reducing working conditions for direct use. [0003] Laser cladding technology is an advanced surface engineering technology. It has the ad...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 赵健崔烺刘光马冰陈杰贾利门路辉付康毛华
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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