Cylinder sleeve inner wall heat insulation wear-resistant composite coating layer and preparation method thereof

A technology of composite coating and cylinder liner, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problems of low spraying temperature, large coating porosity, lack of heat insulation, etc. High temperature oil corrosion resistance, improved self-lubricating performance and excellent thermal conductivity

Inactive Publication Date: 2019-05-21
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] But patent CN108495946A spraying temperature is low, and ceramic material melting effect is not good, and the porosity of the coating made is bigger
The coating prepared by the patent CN107130204A mainly plays the role of wear resistance, and does not have the effect of heat insulation, thus affecting the service life of the entire cylinder liner
The structure of the heat insulation layer and wear-resistant layer in patent CN107354418A is unreasonable, and the heat insulation and wear resistance properties of the coating cannot be improved well, and the prepared coating cannot play a good heat insulation effect

Method used

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  • Cylinder sleeve inner wall heat insulation wear-resistant composite coating layer and preparation method thereof
  • Cylinder sleeve inner wall heat insulation wear-resistant composite coating layer and preparation method thereof
  • Cylinder sleeve inner wall heat insulation wear-resistant composite coating layer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Use acetone to ultrasonically clean the inner wall of the cylinder liner to be sprayed, and then dry it.

[0046] 2. Using brown corundum as the spraying material, carry out sandblasting and roughening treatment on the inner wall of the dried cylinder liner. The particle size of brown corundum is 20 mesh. The sandblasting machine performs sandblasting operation, and the surface roughness of the roughened substrate is Ra7.0.

[0047] 3. Spraying powder includes two substances, one is Al with particle size ranging from 15 to 45 μm 2 o 3 -13%TiO 2 ceramic powder. The other is metal Mo powder with particle size ranging from -74 to +44 μm. Weigh 1000g of the two powders respectively.

[0048] 4. Dry the two powders in an oven at 80°C for 2 hours to ensure that the powders maintain good fluidity during spraying.

[0049] 5. The metal powder and ceramic powder are simultaneously fed into the plasma arc flame flow by means of dual-way powder feeding. The powder feedin...

Embodiment 2

[0054] The difference between this embodiment and Embodiment 1 is that in step 5, the metal powder feeding speed is 15 g / min, the ceramic powder feeding speed is 5 g / min, and the ceramic powder is a bonding agglomeration powder. In step 6, the current of the plasma spraying process is 518A, the voltage is 61V, the flow rate of the plasma generating gas Ar is 50L / min, and the H 2 The flow rate is 8L / min, the spraying distance is 55mm, the vertical translation speed of the gun is 2.5mm / s, and the number of repeated spraying is 6 times.

Embodiment 3

[0056] The difference between this embodiment and Embodiment 1 is that in step 5, the metal powder feeding speed is 20 g / min, and the ceramic powder feeding speed is 6 g / min. In step 6, the current of the plasma spraying process is 518A, the voltage is 61V, the flow rate of the plasma generating gas Ar is 50L / min, and the H 2 The flow rate is 8L / min, the spraying distance is 55mm, the vertical translation speed of the gun is 2.5mm / s, and the number of repeated spraying is 5 times.

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Abstract

The invention belongs to the field of coating layers and particularly relates to a cylinder sleeve inner wall heat insulation wear-resistant composite coating layer and a preparation method thereof. The coating layer is arranged on the inner surface of a cylinder sleeve and comprises ceramic heat-insulation layers and metal wear-resistant layers which are alternately arranged. In the method, an inner hole plasma spraying system with a double-path powder feeder is adopted to perform preparation of the coating layer, metal powder and ceramic powder are sent into a plasma arc flame flow at the same time, the cylinder sleeve rotates around the axis self, an inner hole spray gun head of the inner hole plasma spraying system extends into the cylinder sleeve to move up and down in a reciprocatingmanner through a control program, powder parameters and powder feeding parameters are adjusted, a trajectory is adjusted and controlled, and the composite coating layer with a layered structure is obtained. The alternate layered coating layer is capable of insulating heat and resisting corrosion, enables the cylinder sleeve to perform heat dissipation by conducting the heat to a matrix along thecoating layer and a temperature of the interior of the cylinder sleeve to be maintained within a certain range, so that severe high-temperature wear cannot be caused by heat insulation in a severe high-temperature environment, the abrasion loss of the cylinder sleeve can be effectively reduced, and the heat efficiency of an engine can be improved.

Description

technical field [0001] The invention belongs to the field of surface coatings, in particular to a heat-insulating and wear-resistant composite coating on the inner wall of a cylinder liner and a preparation method thereof. Background technique [0002] In the 21st century, diesel engines have become the main supporting power for automobiles, ships, agricultural machinery, construction machinery, diesel locomotives, and military equipment, mobile and standby power stations. Diesel engines have the highest thermal efficiency and the best energy utilization rate among various machinery. , The most energy-saving models, diesel engines are also developing in the direction of low energy consumption, high efficiency and durability. As the most important core component of a diesel engine, the cylinder liner has a very harsh working environment. The inner surface of the cylinder liner bears the reciprocating friction of the piston and the impact of high-temperature gas when the combu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11C23C4/08
Inventor 张超黄博肖金坤朱崇湘夏园
Owner YANGZHOU UNIV
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